G-boy rev 3 screen flickering

1NK

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I was putting together my G-boy rev 3 and was on step 13 of the build guide. After soldering USB D+ and D- lines to the USB-C PCB I went to turn on the G-boy to see if I got video output, and this is what I got.
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Sorry for bad image quality.

When turning on my G-boy the screen does turn on, but with this gray line jumping around the screen at very fast and random intervals. I thought that this may be some kind of video output, and therefore this may be normal and my Wii trim was working, but I thought to ask if this screen is normal or not. If anyone has any idea what could be the problem then any help would be greatly appreciated.
 

GingerOfOz

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Saw that screen recently, it's probably a U10 issue. Make sure you've got solid connections for it.
 

1NK

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Just came back from re-flowing the U10 pins and making sure the magnet wire was making a good connection, but the screen is still flickering like in the pictures.
 
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Maybe the U10 Is broken so you have to use the u9
 

1NK

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Where on the board can I find a u9 to replace it with?
 

1NK

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Well I'm back after soldering the u9 to where the u10 was, but the white screen flickering is still present.
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1NK

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I didn't cut any trace, I was just following what the G-boy rev 3 build guide was showing. Am I suppose to cut a trace?
 

1NK

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I see now that I was supposed to cut that trace...
I'll come back with the results once I get that trace cut and everything soldered back.
I was trying to cut the trace with an x-acto knife, but if there are any other better ways to cut that trace then I am open to suggestions.
 

1NK

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ok, after cutting the trace and re-soldering everything, the white screen flickering is still there. If there's anything else I could try I would be happy to do so.
 

Stitches

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When was the last time you got proper video output before soldering the USB data lines? Might be worth regressing the steps to see if display returns
 

1NK

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I didn't really get any video at all before soldering the USB data lines. I remember after wiring the rgb led indicator and the screen to the pms, I put power to the g-boy to test the led indicator, and the screen's back light turned on for a second before the screen powered off. Only after soldering the usb data lines did I get video, but the "video" I got was the white flickering screen.
 
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First things first, clean your pcb with IPA and a toothbrush. Sometimes just flux between different pads can put current where it shouldnt be.... Also, desolder components and clean pads with braid. Then clean with ipa too...

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Before you soldered the usb data lines, were you seeing the bootloader text on the screen?? or was it always glitchy video... Check your ribbon cable from screen to driver board too.
 

1NK

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Would the board still be ok if I de-soldered the components in the upper left circle? From what I can tell in the G-boy guide those components were just left there,
wii trim board components.png

but if I need to de-solder them then I will.
 

1NK

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Also, the video was always glitchy, I never got the bootloader text on the screen. I checked the ribbon cable to the driver board and its making a good connection.

Right now I'm still cleaning the board and removing the dead components.
 
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I've gotten a similar glitch on the right side of the screen on one of my LMAO v2 trims. I hope we can track it down for you. It makes me want to go back and figure out that board.
 
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