Author Topic: Everdrive N8 random white artifacts on screen?  (Read 27055 times)

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Offline raverrevolution

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Re: Everdrive N8 random white artifacts on screen?
« Reply #30 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.

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Re: Everdrive N8 random white artifacts on screen?
« Reply #31 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
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Offline EvilMilkshake

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Re: Everdrive N8 random white artifacts on screen?
« Reply #32 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?

Offline stratusfear

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Re: Everdrive N8 random white artifacts on screen?
« Reply #33 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.
« Last Edit: December 12, 2016, 06:53 PM by stratusfear »

Offline zansatsu0

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Re: Everdrive N8 random white artifacts on screen?
« Reply #34 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.

Offline stratusfear

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Re: Everdrive N8 random white artifacts on screen?
« Reply #35 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.

Offline Mr.Filz

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Re: Everdrive N8 random white artifacts on screen?
« Reply #36 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

Offline raverrevolution

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Re: Everdrive N8 random white artifacts on screen?
« Reply #37 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.

Offline Donholio

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Re: Everdrive N8 random white artifacts on screen?
« Reply #38 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.
« Last Edit: December 17, 2016, 11:56 AM by Donholio »

Offline zansatsu0

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Re: Everdrive N8 random white artifacts on screen?
« Reply #39 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.

« Last Edit: December 17, 2016, 07:36 PM by zansatsu0 »

Offline desy

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Re: Everdrive N8 random white artifacts on screen?
« Reply #40 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.

Offline Mr.Filz

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Re: Everdrive N8 random white artifacts on screen?
« Reply #41 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...

Offline Donholio

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Re: Everdrive N8 random white artifacts on screen?
« Reply #42 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.
« Last Edit: December 21, 2016, 10:57 AM by Donholio »

Offline desy

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Re: Everdrive N8 random white artifacts on screen?
« Reply #43 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.


Offline zansatsu0

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Re: Everdrive N8 random white artifacts on screen?
« Reply #44 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.


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

For example:
Alps (no cover):


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:


Alps:


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.
« Last Edit: January 04, 2017, 05:37 PM by zansatsu0 »