EverDrive Forum

General => EverDrive N8 => Topic started by: desy on June 26, 2016, 04:14 AM

Title: Everdrive N8 random white artifacts on screen?
Post by: desy on June 26, 2016, 04:14 AM
Hi, I'm using the Everdrive NES N8 with a front-loader NES and a Sony Trinitron CRT TV. I've noticed that while playing some games, there are some small random white artifacts that quickly flicker around the screen and then disappear.. maybe like 2-10 very quick white flickers every second.

I have captured a picture of Tetris intro splash with one of the random white flickers:
http://imgur.com/CzNXZ5S (http://imgur.com/CzNXZ5S)

When I remove the Everdrive N8 and put my original copy of Tetris, there is no flickering anymore so somehow it seems related to my N8..  It seems to only happen with certain games and certain scenes.. some games display no artifacting.

I will try on another NES and TV but expect to see the same.

Has anyone seen this sort of flickering?

Thanks for your help

(http://i.imgur.com/CzNXZ5S.jpg)
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on June 26, 2016, 04:27 AM
UPDATE: I tried another front loader NES and the issue went away! I used the same power adapater and RCA cable.

One Nintendo displays the artifacting 100% of the time
Second Nintendo does not, ever.

Perhaps a difference in quality of parts in the NES? Strange that only with Everdrive this symptom appears. Original Tetris game does not exhibit the artifact on either system.

I found another post on here that sounds very similar to what I've mentioned: http://krikzz.com/forum/index.php?topic=2634.0 (http://krikzz.com/forum/index.php?topic=2634.0)

His fix was also to replace the NES itself.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: goombakid on June 26, 2016, 08:13 AM
Connector problem, possibly.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on June 27, 2016, 12:07 AM
I don't think so. I just boiled the 72-pin connector and see no difference. I've also tried removing & re-inserting the everdrive many times and it always reproduces the same behaviour. I think this particular NES just has inferior components needed to run the Everdrive without this artifacting. I've seen Krikzz mention having a NES with good components is important.. perhaps this is an example.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: DoubleDragon on July 01, 2016, 09:20 PM
I bought the N8 a month ago and I just registered here, because I have been experiencing the exact same problem as you have. I'm glad you were able to make a photograph of it, because it's hard to capture! These artifacts appear as soon as I power on the NES with the N8 inserted. I swapped out the 72-pin connector with a spare one and still the same problem. The artifacts do not appear when I use normal cartridges. I am seeing these problems on a PAL NES (Spanish version).

I do have to add that the artifacts are not so noticeable during gameplay as to totally spoil the experience, but they're still a nuisance and I'd prefer to have an N8 without artifacts....  :-\
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on July 07, 2016, 04:50 AM
Hi DoubleDragon,

Are you able to try another NES system?

Do all games show the same short white lines, or only certain games? The picture I took is from Nintendo's version of Tetris opening screen

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: NES nostalgic gamer on July 13, 2016, 08:51 PM
Hello everyone,

I have the same problem, I bought the everdrive from the Stone Age gamer site, and I am using it to play on a front loader NTSC NES with RGB mod, framemeister and new 72 pin connector (death grip), all the capacitors are new, the modder also got a voltage regulator in the system to smooth out the power and i use an original AC adapter.

The problem is that here in my town where in live in Mexico I am unable to try on another console, because I'm new here.

The question is how to fix it?
Is the mod affecting the outcome image?
Should I buy another AC adapter? (For example RetroDC)
Should I get a refurbished 72 pin connector?
Or is it an everdrive problem?

Also the cartridge gets really hot

With original games I don't have the problem, it's only with the N8

Another problem that I have is that it sometimes changes the letters on the menu to unreadable squares, I have to take it out, back in several times until it "works" with the random artifacts

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: FeverDrive on July 14, 2016, 01:10 AM
I guess the problem is bad contacts/conductivity in the connector.
The easiest solution is to get a new console that doesn't have the problem, now if you want to do more work try changing the cartridge connector.
I don't think the voltage regulator mod creates this problem.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on August 18, 2016, 08:43 AM
FYI I've tried 4 different front-loader NES systems... 3 of 4 displayed the weird artifacting behavior (tested with Tetris).
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: immrbig on August 22, 2016, 11:32 AM
I have had something similar come up in a few games.

Are there sometimes many of these artifacts on the screen? I saw these in Metroid, Kirby, SMB3, and Punch-out! in addition to Tetris.

(https://i.imgur.com/OOowE3q.jpg)
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on August 23, 2016, 03:56 AM
Yes, your picture looks just like mine. I do see multiple lines just like that, very quick flickers (1 frame?), somewhat-random locations.. and only some games as you mentioned.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on August 23, 2016, 05:24 AM
I also see it in those same games (Metroid, SMB3, and Punch-out!) .. Kirby I didn't notice, i do see flicker at start of first level but I think that's just the way the game is.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: immrbig on August 24, 2016, 03:48 AM
I Kirby I only see the noise on the pause screen. My front-loader is RGB modded, but I still see the noise if I disable the mod and go back to regular composite output.

I was playing around with different filtering capacitors last week, and when had the top RF shield off I noticed that the noise got worse in SMB3. I started seeing it at the black end-of-level screen instead of only on the scrolling secret cloud areas (W1L3, for example).

It appears that the N8 is generating noise, which is getting radiated/leaked back into somewhere that causes the white lines on the screen. I tried shielding the N8 itself, but that didn't have an effect.

There have been other cases where NES systems generated noise only when an N8 was present. See this thread, for example: http://shmups.system11.org/viewtopic.php?f=6&t=50313

I removed that transistor on my machine but didn't notice any difference.

Unfortunately, I don't have any equipment that would let me properly diagnose this issue. I suspect that some extra shielding or a strategically placed bypass cap would fix this.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on September 02, 2016, 07:27 AM
UPDATE: 9/2/2016: Added revision 10 w/ Mitsumi AV/P.

I just recently got into restoring NES front loader consoles and I have been collecting them for repair and re-sale.

I too am having this problem. I only have access to front loaders at this time so I can't speak for the top loader, but I do have access to multiple revisions of front loader hardware.

What it's not, that I can tell:
-- It doesn't appear to be aging caps that cause this issue as I have recapped the AV/Power module AND motherboard of the two that exhibit this already (I use Nichion and Rubycon caps).
-- It's not the voltage regulator as I've replaced the 17805 on one in hopes that it was that.
-- It's not the 72 pin connector because I have a Blinking Light Win and this behavior is identical with an OEM, clean, and functioning 72 pin connector.
-- It's not the wall wart as I have several OEM 9VAC and a reliable aftermarket DC wall wart at 10VDC.
-- It doesn't appear to be RF shielding: On revisions that do not exhibit this behavior, a motherboard stripped bare and played will not show these artifacts.

The only commonality that I can tell so far between NES front loaders is that ones that have the Mitsumi AV/Power module on a NES-CPU-08 motherboard exhibit this artifacting. But this has only been on two consoles. This is confirmed on 4 consoles so far. I need to get all the consoles at my disposal fully functional and document their hardware configurations to see if there is any real pattern.

We should probably start listing motherboard revisions and AV/Power module brands just in case. If you have a top loader doing this, please chime in. I think the more documentation we have on this, the better a chance we have of solving this. I will update this post if I find any different configurations exhibiting artifacts.

Revisions I have seen this on so far:
Code: [Select]
NES-CPU-08 w/ Mitsumi AV/Power module (2/2 tested)
NES-CPU-10 w/ Mitsumi AV/Power module (2/2 tested)(Added 9/2/2016)

Of note:
I've seen the occasional *singular* blip on Alps powered units, but it's rare and goes away after the internals warm up. Mitsumi powered units (so far) are the only ones exhibiting this behavior. This is far from scientific until I have other sources confirm my findings of course.



This makes me wish I had an oscilloscope so I can watch for anything odd when the artifacts appear. I've also noticed while recapping that the Alps modules have about 2 to 3 more caps on average than the Mitsumi modules, so I was wondering if that makes any difference. The designs are different between the Mitsumi and Alps modules and maybe this contributes to the noise? Probably conjecture at this point as it's too soon to tell. It may even be the MoBo revision, regardless of the AV/P module.


Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on September 03, 2016, 03:05 AM
I've spent most of the day contemplating this and researching in free moments. As mentioned before by other members, I too suspect the Everdrive is introducing 5V rail noise and it's interfering with the graphics.

I say this because I'm putting together gifts for the holiday season and I purchased a copy of Mike Tyson's Punch Out. There is no image noise on any revision using an original cartridge. Regardless of whether or not there is a difference in the design of the AV modules or MoBos, this has to be something the Everdrive is doing and the Mitsumi module's minimal design has probably highlighted this.

I'm tempted to spec out some caps that will fit inside my cartridge and solder to pins 1 and 3 on the 3.3V AMS1117 to see if this decouples the noise. There is a tantalum cap that appears to be soldered across 5V input and ground on the N8, but the value may not be high enough.

If anyone reading this has an oscilloscope and wants to measure 5V line noise while playing Mike Tyson's Punchout on the N8 and comment, I would love to know their results.


Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on September 04, 2016, 12:59 AM
I think I've ruled out the AV/Power unit. I took an Alps AV/Power unit and swapped it onto a motherboard exhibiting these artifacts that came stock with a Mitsumi AV/Power unit and the artifacts were still present. This rules out 5V rail noise. Whatever is happening is doing so independent of the power supply. This could be a firmware issue in relation to CPU/PPU revision.

@krikzz: I am willing to ship you a frontloader NES that exhibits this issue for testing, if you think it would help. PM me if you are interested.

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: FeverDrive on September 06, 2016, 06:45 AM
Hey Zansatsu, perhaps you can get a second hand oscilloscope? I guess you are from the US where they are easy to get. The next week I'm going to test the N8 with a couple of NES (front loader) consoles I have and use an oscilloscope to check for 5V noise.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: immrbig on September 06, 2016, 07:56 AM
I am using a custom AC/DC converter circuit, but I have completely ruled this circuit out as a source of interference.

I have Rev G NTSC CPU/PPUs, and my motherboard is stamped -09.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: polyh3dron on September 06, 2016, 10:09 AM
I get this like crazy on my NESRGB modded AV Famicom with the EDN8, but only on certain games. The game that stands out the most is Gargoyle's Quest 2. This is both on my PVM and my Framemeister.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on September 08, 2016, 06:58 PM
Hey Zansatsu, perhaps you can get a second hand oscilloscope? I guess you are from the US where they are easy to get. The next week I'm going to test the N8 with a couple of NES (front loader) consoles I have and use an oscilloscope to check for 5V noise.

I'm looking into acquiring an oscilloscope at the moment, I just have to wait for the funds to accumulate.

I'm very interested to see what your results are!
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on September 08, 2016, 07:04 PM
I am using a custom AC/DC converter circuit, but I have completely ruled this circuit out as a source of interference.

I have Rev G NTSC CPU/PPUs, and my motherboard is stamped -09.

The odd thing is that I'm seeing these artifacts on revision G at about a 50% occurrence rate. Some have them, some don't.

Also, it's very cool that you have a custom AC/DC power source as this confirms my findings too. Thanks for responding. :)
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: mrGREEK360 on September 09, 2016, 07:51 AM
I was seeing graphical glitches in smb real cart and everdrive so I went on a hunt for info, I have come upon this.

http://forums.nesdev.com/viewtopic.php?f=2&t=13046 - short version of the info
http://forums.nesdev.com/viewtopic.php?f=2&t=10104 - original post

I think this issue was discussed on nes dev, this happens on stock nes NTSC / j NTSC Famicom with original carts about 1/4 every time you boot certain games with coding that causes this bug.

I'm not knowledgeable about this stuff but if its a different graphical glich sorry for wasting your time lol.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: immrbig on September 09, 2016, 03:00 PM
I was seeing graphical glitches in smb real cart and everdrive so I went on a hunt for info, I have come upon this.

http://forums.nesdev.com/viewtopic.php?f=2&t=13046 - short version of the info
http://forums.nesdev.com/viewtopic.php?f=2&t=10104 - original post

I think this issue was discussed on nes dev, this happens on stock nes NTSC / j NTSC Famicom with original carts about 1/4 every time you boot certain games with coding that causes this bug.

I'm not knowledgeable about this stuff but if its a different graphical glich sorry for wasting your time lol.

This is a different issue, specific to SMB (don't personally know about other games), and unrelated to EDN8.  Even authentic cartridges on original NES hardware do this.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: RetroRyan84 on September 25, 2016, 08:03 PM
I have two Everdrive N8's and both do this on my front loader NES too! Some games worse then others like you guys have stated. I really hope you guys get to the bottom of this! It's very frustrating. My Everdrive MD and Super Everdrive play every game flawlessly without glitches. I wish my N8's did too :( Can Krikzz chime in here please
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: onegoodsoul on November 18, 2016, 01:35 AM
Same problem here. EverDrive n8, frontloader, NESRGB. Tried different SD cards, different brands. I tested on a real cartridge, no issues (Ninja Gaiden (USA). Tested with same game (Ninja Gaiden (USA, on EverDrive n8 - random horizontal lines that appear for about 1 frame. Some games have this issue, others do not.

I have tried a different powers supply, same issue. NES SN# is about 2,48XX,XXX.

Looks like a PPU related issue. I purchased my N8 from StoneageGamer.com early 2016 and I am using latest OS.

Anyone have ideas?
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on November 18, 2016, 08:28 PM
I have 6 front loader NES.. out of those 6, two of them exhibit no issues. I should try to open them up to note any differences.

krikzz, have you seen this in your testing as well?
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on November 18, 2016, 08:39 PM
I have 6 front loader NES.. out of those 6, two of them exhibit no issues. I should try to open them up to note any differences.

krikzz, have you seen this in your testing as well?

I did some preliminary investigation on this and found that NES consoles with the Mitsumi AV/Power units have a tendency to do this more often than ones using the Alps AV/Power units. I tried swapping an Alps AV/P unit in for a Mitsumi AV/P unit, but it wasn't the AV/P unit itself. It makes me think that there may be a minor difference in some PPU / CPU revisions despite being revision G. But a generally good indicator is units with Alps power supplies tend to do it less. If anyone has information to the contrary, please post here.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: brianvgplayer on November 18, 2016, 08:49 PM
I have this issue on some games with the AVS, but not with my AV Famicom. Odd thing is that there are some games were only the US or JP version is affected.

Edit: Reverted back to the stable firmware (1.10) for AVS and the artifact problem disappeared.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: onegoodsoul on November 22, 2016, 09:40 PM
Any progress on this issue? I am hopeful Krikzz can shed some light on the issue.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: EvilMilkshake on December 03, 2016, 02:57 AM
I am also experiencing this. Any info is greatly appreciated. I've only been able to test a few of the games vs the N8, but I have not been able to duplicate the problem on the original carts. Some games like Tetris and Punch-out show the effects very frequently, like every second or two.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: raverrevolution on December 08, 2016, 03:42 PM
I just started to experience these as well and I just installed a Hi Def NES kit on my Famicom AV.  I don't remember ever seeing these before.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: lee4 on December 08, 2016, 09:22 PM
For Hi Def NES kit
you need change the Despeckle option in
the Hi Def NES option menu
to remove random dots on screen
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: EvilMilkshake on December 08, 2016, 10:24 PM
For Hi Def NES kit
you need change the Despeckle option in
the Hi Def NES option menu
to remove random dots on screen

This depends on the game. May be related, may not. I can't speak for everyone, but I'm exhibiting the same behavior that immrbig got in a screenshot. However, this fix you posted is related to the PPU, revision G according to RetroRGB. I have a G series PPU in both of my consoles and this happens on one, but not the other, although I only have a NESRGB installed on one.

Maybe this is a similar issue with Revision G? I don't have a spare PPU to test, but if anyone has a spare or version E or F PPU, maybe swap only that chip on a unit showing the artifacts?
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: stratusfear on December 12, 2016, 06:41 PM
I have the same issue as in immrbig's screen cap. I've noticed it in Metroid (cart or FDS), as well as Fire Emblem and Fire Emblem Gaiden. Much more rarely in SMB3 though, usually happens on the entering a stage from the world map animation when it does happen. Front loader with NES-CPU-10 board, rev h chips, Mitsumi power/AV board. Just got a hi def kit installed. I didn't notice it previously, it may have been there but not sure. Unfortunately I don't have a lot of original carts to test if it's just an EDN8 thing but I am guessing it is based on other folks responses in this thread. Adjusting phase in despeckle doesn't fix this issue.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on December 12, 2016, 06:46 PM
Unfortunately I don't have a lot or original carts to test if it's just an EDN8 thing but I am guessing it is based on other folks responses in this thread.

I can confirm that with an original cart of Mike Tyson's Punchout that this issue only appears when using an Everdrive.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: stratusfear on December 12, 2016, 06:52 PM
Unfortunately I don't have a lot or original carts to test if it's just an EDN8 thing but I am guessing it is based on other folks responses in this thread.

I can confirm that with an original cart of Mike Tyson's Punchout that this issue only appears when using an Everdrive.

Once I get my hands on a few of the original games in question I'll add my data points to this thread, but I expect I will have the same results as you.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Mr.Filz on December 13, 2016, 10:22 PM
I have the exact same problem with an av famicom here. The white lines do appear even in the menu of the n8! Very annoying. I noticed this first in Rockman 5. I had also seen this in Super Mario Bros and Batman The Video Game. Does this appear on all OS? I have the latest! There is a video on youtube about the problem:

https://www.youtube.com/watch?v=rrBwZNzY0A8
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: raverrevolution on December 15, 2016, 06:02 PM
For Hi Def NES kit
you need change the Despeckle option in
the Hi Def NES option menu
to remove random dots on screen

Sorry to reply so late, but despeckling is doing nothing although I have it permanently set to phase 1 due to games like Little Nemo spazzing out although the actual cartridge doesn't so this is Everdrive specific.  I could have sworn though that despite turning that option off I'd still get the SMB artifacts.

For Hi Def NES kit
you need change the Despeckle option in
the Hi Def NES option menu
to remove random dots on screen

This depends on the game. May be related, may not. I can't speak for everyone, but I'm exhibiting the same behavior that immrbig got in a screenshot. However, this fix you posted is related to the PPU, revision G according to RetroRGB. I have a G series PPU in both of my consoles and this happens on one, but not the other, although I only have a NESRGB installed on one.

Maybe this is a similar issue with Revision G? I don't have a spare PPU to test, but if anyone has a spare or version E or F PPU, maybe swap only that chip on a unit showing the artifacts?

My CPU and PPU are G as well.

In the long run though it doesn't bother me too much.  For most games you see nothing anyway.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Donholio on December 17, 2016, 11:54 AM
Chiming in with a few NESes to give a larger sample size. I am doing refurbs on a bunch of these NESes right now. I have one EVN8 purchased last month from Stone-Age Gamer.

I have 2 NES-CPU-6 boards without any issue. Both have ALPS power boards.

I have 1 NES-CPU-8 board without any issue. This has a Mitsumi power board.

I have two NES-CPU-10 boards. One has the issues as described by others with a Mitsumi power board, one has a lesser version of the issue with an ALPS power board. The Mitsumi board shows VERY frequent and repeated white horizontal glitches as described by others on Mike Tyson's Punch Out when boxing. The ALPS board shows very minimal graphical glitches. Almost few enough to make it tough to see.

I also have two other non-working / problem boards- CPU-10 with ALPS (waves in the video) and a CPU-06 with ALPS (non-functional. Buzzing noise with an obvious bad cap). I can test these after I get them working again.

I have 3 OEM NES power supplies currently. The problem always follows the board / EVN8 combo. I'll have a Mastech variable DC power supply coming. I could use that to make absolutely sure this isn't adapter-related or power supply-related.

I normally use Blinking Light Win connectors, but to be safe I tried an OEM (not chinese-made) 72-pin connector. Both connector types show the issue. The BLW unit is brand new and another slightly used BLW shows the issue as well. This isn't connector-related from what I've seen. All original carts work great. Most games on the EDN8 work great. I've specifically seen the issue inside of Mike Tyson's Punch Out. The issue happens in that game every time. I'm using the SmokeMonster ROM set.

I have tried on a PVM and 2 flat screens all through composite. The problem follows the board / EVN8 combo.

I re-capped the problem Mitsumi board and replaced the voltage regulator with thermal grease. Also re-capped the main NES board on that unit using a kit from Console5 thinking that was the issue, but it made no difference at all.

I have a digital scope (Rigol). I am willing to pull some info, just need guidance on where to probe.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on December 17, 2016, 07:26 PM
I have a digital scope (Rigol). I am willing to pull some info, just need guidance on where to probe.

I've got a scope on order, but probably won't be receiving it until January. Thanks for chiming in!

I think the first thing I would want to rule out is rail noise. A probe at the +5V rail at pin 36 of the N8s card edge connector would be a good starting point. Then just watch for noise that syncs with the visual artifacts.

If that wasn't fruitful, I would check the drains for all the transistors on the NES main board, once again checking for noise that syncs with the visual artifacts. The drains should let you know which is the troublemaker. We can then trace that transistor's circuit and see if there is something we can do.

That's where I would start anyway. If anyone with more experience would like to add to the conversation, I would love to hear from you.

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on December 18, 2016, 10:52 PM
Hey Mr.Filz, I just tried the same Captain America game as your video.. I too see the same thing in the map screen. My "working" Nintendo did not show any lines, but my other "non-working" ones do.

Thanks to those trying to look into this. Over the holiday I will open my NES systems and list each as working / not working.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Mr.Filz on December 19, 2016, 06:13 PM
I thnk the manufactor of the everdrive should look into this problem! It seems to affect more customers. The card works, but the artifects are pulling me out of the gaming experience. I ordered an adapter, so i can play most of my pal games on the famicom. The plan was to not fiddle with such a device. Thats why i had bought the everdrive for a lot of money. Its a bit dissapointing with this problem. Hopefully there are more customers in the future to complain about it, so they will work out a fix for it...
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Donholio on December 21, 2016, 10:54 AM
Thanks zansatsu0. I'll see if I can get some of that done this week. If not, it might have to wait until January.

Update on the other CPU-10 board with waves in the video I mentioned in my previous post. The board has an Alps power supply also shows artifacts to a lesser degree like the other CPU-10 Alps board I have. I re-capped the entire Alps module and the main board like I did with the Mitsumi CPU-10 board I talked about in my first post. I got rid of the waves in the video, but the lesser artifact issue is still there.

It looks to me like the CPU-10 boards are my problem children. All three of them have the artifact issue. The boards with Alps power modules show the issue to a much smaller degree. The Mitsumi power module board I have shows LOTS of artifacts.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on January 04, 2017, 04:34 PM
Hi all, I have some time and a bunch of NES.. some that have the issue, some that don't. How can I help here? What information will be useful and where can I find it? I assume I'll need to open each NES to see exactly what's inside.

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on January 04, 2017, 05:32 PM
Hi all, I have some time and a bunch of NES.. some that have the issue, some that don't. How can I help here? What information will be useful and where can I find it? I assume I'll need to open each NES to see exactly what's inside.

STANDARD DISCLAIMER:
I'm not responsible for any mishaps during disassembly/reassembly. Proceed at your own risk. Make sure to do your homework if unsure.

Safety tips:
1. Unplug the AC power adapter before service.
2. With the AC power adapter unplugged, press in the power button turning the unit on. This will discharge the capacitors in the power supply. This prevents things like a fried hex inverter leading to no audio (*cough* speaking from experience).

Unfortunately, in order to obtain the CPU revision, you will need to remove the top of the NES and all internal screws so you can flip the motherboard over and view the revision printed between the CPU and PPU.
(http://i.imgur.com/CY7LW6d.jpg)

If you have the top off, you can easily see what brand the power unit is by its engraving.

For example:
Alps (no cover):
(http://i.imgur.com/bV4mVAs.jpg)

At a quick glance, without disassembly, it is possible to see if the front loader has an Alps or Mitsumi power unit by looking into the vent directly under the audio and composite video jacks (red and yellow), next to the FCC ID label. Below are two pictures of different power units demonstrating what you are looking for in the vent. I will say that it's actually easier to read it with two eyes than it is to take a picture of it.   ;)

Mitsumi:
(http://i.imgur.com/2gsXx6B.jpg)

Alps:
(http://i.imgur.com/pLc65J2.jpg)

Also, when you list the games where the artifacts were exhibited, can you state original cart, vs Everdrive? :)

Thanks in advance for adding to the list so we can establish a pattern.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Donholio on January 17, 2017, 10:39 AM
I took some readings with my scope with the Everdrive and another cart I owned. I didn't see much of a difference between the two and I didn't see spikes when the artifacts came on the screen. Here's the output I see while playing Mike Tyson's Punch-Out. The trace looks pretty "messy" and changes when things change on screen (fighting screen looks one way, corner screen looks another). I had to connect to the 72-pin connector (far right pin on the outside set of metal connections looking from the back). I couldn't connect to the Everdrive while it was connected into the system.

(http://i.imgur.com/2bUf0G7.jpg)

-Don
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: jdove on February 07, 2017, 07:03 AM
all you gotta do is get a better plug I got one of those universal ac adapters that comes with all those different plug attachments it had a voltage switch on it to set different voltages it the one setting that is default to the Nintendo oem plug I get the artifacts if I switch it up to the next higher voltage no artifacts its not the design of the everdrive its the plug maybe the nes oem plug isn't strong enough to give it enough power while using the everdrive ths also fixed wavy lines thru my nes signal but that wasn't everdrive related
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: zansatsu0 on February 07, 2017, 07:13 AM
This is not AC adapter related. It's exhibited with OEM and aftermarket adapters on NES consoles with Mitsumi AV units with certain CPU revisions. I wish it was that simple.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: jdove on February 07, 2017, 09:17 AM
I was getting the same artifacts as in the pictures when I turned the voltage up on my adaptor it stopped so it worked for me. The adaptor I got has more power than the oem or aftermarket ones that run the same voltage as the oem, it goes up to 1300 ma DC and has switches to run at different voltages. At any rate its worth a try. I don't know what chips are in my nes, but I was getting the artifacts and then they have disappeared since doing what I said.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: desy on February 08, 2017, 03:53 PM
which AC adaptor did you get?
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: jdove on February 10, 2017, 05:15 AM
It was an insignia ac adapter with usb port it has like 6 attachments that come with it and a switch on the wall plug its pretty generic was the only one the best buy by me sold it doesnt have a model # or anything
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Coldheat007 on May 23, 2017, 01:24 AM
It was an insignia ac adapter with usb port it has like 6 attachments that come with it and a switch on the wall plug its pretty generic was the only one the best buy by me sold it doesnt have a model # or anything

Would this be the power adaptor?
http://www.bestbuy.com/site/insignia-ac-adapter-black/5019131.p?skuId=5019131 (http://www.bestbuy.com/site/insignia-ac-adapter-black/5019131.p?skuId=5019131)
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Tomba on June 14, 2017, 10:29 PM
Has anyone else tried the AC adapter listed above with the suggestion of increasing the voltage?

I'm experiencing the same issue and am currently using an unmodified NES frontloader with a cleaned and solid 72pin connector, 10 motherboard, original power supply, stone age gamer everdrive N8 with their SD card that came in the mail yesterday with the smokemonster rom pack and included OS.

I'll pull my second front loader out of storage and give that a shot tonight since I dont know what board that one is running.

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Matalog on June 20, 2017, 09:46 AM
Tomba,

This issue sounds very much like the issue Krikzz posted a test solution to at http://krikzz.com/forum/index.php?topic=6135.60 (http://krikzz.com/forum/index.php?topic=6135.60)
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: Atse on August 02, 2017, 04:39 PM
I have the same issue as mentioned above.
Recently got a NES2 top loader and I installed a Hi Def NES kit in it. Got this problem, ONLY with the Everdrive. Original cart works fine!

One thing I did was I replaced the CPU and PPU to a PAL couple I had laying around and the problem was gone!

So there is most likely some compability issue with some PPU:s i suppose and the Everdrive. Would be nice if Krikzz could look into it.

Edit: Despecle settings do nothing with this issue, tried.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: NOBODY on December 18, 2017, 03:55 PM
Hi guys,
I did exhaustive tests. I notice I had this issue using N8 with some games. I could see many of these artefacts on “continue screen” of Dragon Fighter. I fortunately have the original cartridge to compare and using the original one I got no artefacts at all.
I could not notice any issue playing Ninga Gaiden II, twice until the end, but I saw few playing Punch Out while using N8 and a lot in “continue screen” of Dragon Fighter.

I guess it is something related to OS v16-rc1 or voltage of the N8-everdrive or possibility the junction of it with the console.
I am using a Famicom with a mega drive’s power.

I also plugged the power supply in another wall to avoid any interference of TV.

AV Famicom with HiDef.
CPU and PPU rev.H

I hope it’s enough to clarify what could be the fount of the problem.
Regards
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: EverDriver on December 18, 2017, 04:49 PM
Hi NOBODY!

Could you please post a photo of the PCB of your N8? The front side.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: NOBODY on December 18, 2017, 05:02 PM
Hi NOBODY!

Could you please post a photo of the PCB of your N8? The front side.

I dont know if the picture is that clear, however, there we go!
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: EverDriver on December 18, 2017, 07:19 PM
Thanks for the photo!

Have you tried to use final OS 16 (not RC1)?
If the final OS 16 doesn't help you should try a console without mods.

Title: Re: Everdrive N8 random white artifacts on screen?
Post by: NOBODY on December 19, 2017, 12:18 AM
Thanks for the photo!

Have you tried to use final OS 16 (not RC1)?
If the final OS 16 doesn't help you should try a console without mods.

Thanks! It worked like a charm.

I hope I am not losing too many updates.

As I said before, worked fine with original cartridge without issues.

But OS 16 is the best one at the moment.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: andreasswf on December 27, 2017, 11:34 AM
I have this. But only when I am using my NES version n8 with adapter in my famicom AV. The everdrive shows no flicker in my front loading NES, though.
Title: Re: Everdrive N8 random white artifacts on screen?
Post by: brianvgplayer on December 29, 2017, 04:36 AM
No white artifacts on AV Famicom with Famicom style Everdrive N8 using OS 16, but I do have artifacts on later revisions of the AVS firmware.