Question VGA issue on Ashida portable Wii – image turns green when all colors are connected (help)

[AlessMaker]

Hello everyone,
I’m working on a Wii portable (Ashida) using a 4-layer trimmed board, PMS-2.., and RVLoader.
It had been working perfectly for almost a year, but after I completely disassembled it to install new batteries, the screen started showing strange colors.
The screen board I’m using is a PCB80050V9 from 4LayerTech.
The console itself boots fine, RVLoader runs perfectly, and everything else (power, audio, USB, etc.) works as expected.
The only problem is a strange color issue on VGA.

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Current wiring​

The wires from the screen board go to the Wii as follows:

• 
  
• Pad 11 (Pr / B) → twisted with GND
• 
  
• Pad 9 (Pb / Chroma / G) → twisted with GND
• 
  
• Pad 7 (Y / Luma / R) → twisted with GND
• 
  
• H-Sync and V-Sync twisted together with a ground wire

Everything else works properly.

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Color tests​

Connected wires	Color on screen	Result
Red only	Red	ok
Green only	Green	ok
Blue only	Blue	ok
Red + Blue	Magenta	ok
Red + Green	a bit of red, but green clearly overpowers it.	idk
Green + Blue	Cyan	ok
All three (R + G + B)	Green	Problem

each color works perfectly on its own, but when all three are connected, the image turns green instead of white like the green channel is overpowering the others.
look at pics !

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Resistance measurements​

Without screen wires connected:

• 
  
• Pad 11 (Pr / B) ↔ GND ≈ 37 Ω
• 
  
• Pad 9 (Pb / Chroma / G) ↔ GND ≈ 3 MΩ
• 
  
• Pad 7 (Y / Luma / R) ↔ GND ≈ 37 Ω

With screen wires connected:

• 
  
• Pad 11 (Pr / B) <--> GND ≈ 75 Ω
• 
  
• Pad 9 (Pb / Chroma / G) <--> GND ≈ 50–70 Ω (variable)
• 
  
• Pad 7 (Y / Luma / R) <--> GND ≈ 75 Ω

Pad 9 looks suspicious when disconnected, it reads nearly open (3 MΩ), but when connected to the screen, it goes back down to 50–70 Ω and still produces a green image on its own.
That’s confusing because the signal clearly passes, but its impedance doesn’t match the others. Could this mean a partial failure inside the AVE-RVL chip?
If anyone knows the expected resistance values for these pads, or has already dealt with a similar issue (each color OK alone but not when combined), I’d really appreciate some help or advice.
Thanks in advance!

 

[Customledmods]

I kinda had same issue https://bitbuilt.net/forums/threads/gwii-green-tint-on-lcd.4801/

 

[Shank]

Check the load resistors around the AVE. You make have knocked one loose. If I recall correctly, supposed to be a resistor to ground running from the green line to properly attenuate it the signal. You can find which one it is specifically by checking the compendium and following the green line from the AVE.

Posting clear pitures of the Wiis PCB near the AVE and your solder points could help. My guess is a resistor was knocked loose or broken.

 

[AlessMaker]

Thanks a lot guys! What you both said really helped me figure it out.
I did have the RGB wires swapped at first, but even after fixing that, I was still getting a green-purple tint.
In the end, it turned out I hadn’t run the auto configuration on my screen after doing it twice, it completely solved the issue the screen adjusted itself and now the colors look perfect.
So yeah, thank you both again!
And if anyone else comes across this thread later make sure your RGB wires are connected in the right order, and run your screen’s auto configuration. Also, try adjusting contrast and brightness, it can make a huge difference.
And also, check your resistances like Shank mentioned it really helped me understand between GND and the Wii pads 11, 9, and 7, you should get around 37 Ω with the wires connected to the Wii board, and 75 Ω without the wires !