OLED Switch Repair Help

[DCReddish]

I've been given an Nintendo Switch OLED Model which has liquid damage through.

I've managed to clean up the liquid damage, the corrosion and narrowed down a few issues which I've fixed.

I've had to replace the charge port which fixed the switch taking power and the switch now powers on, the touch screen works and the sound, but I get no display.

When I connected it to the doc after the port replacement, the dock lit up green, then crashed and stayed green even when removed the switch from the dock, until I unplugged the dock, and no it doesn't detect the switch when I put it in (minor problem - Suspecting the PI3USB IC to be the cause)

The issue I'm stuck with is the switch doesn't give me any display, I get sound when it turns on and when I touch the screen it works and makes sound, but nothing displays, I've replaced the screen to a known good screen and still same issue, I also replaced the FPC connector but still same issue.

Has anyone encountered a similar issue, and know what would be causing, I suspect it's an IC that's controls the display output, but it's my first switch repair so I'm not 100% on which IC it would be, I'm not finding any shorts or hot spots through the board.

I do have a donor board with a dead APU but all other components work.

 

[iiTzSamurai]

I would check the pins in the ribbon cable connector itself. Sometimes those can get bent out of place real easy
This video will help show what I mean about the connector

 

[DCReddish]

I would check the pins in the ribbon cable connector itself. Sometimes those can get bent out of place real easy
This video will help show what I mean about the connector

Thanks for the message, unfortunately this doesn't seem to be the issue I'm having the pins in the connector are straight and working, I've replaced the FPC connector twice, once from the donor and the second time to a brand new connector but still no display, I've tried with both original and known good screen after each replacement, and both times the touch screen works but no display

 

[slimeinacloak]

Have a look at the small square IC next to the nand chip, I remember having either the same issue or where the display worked but no touch. Boardviews and diode test values to compare to: https://gbatemp.net/threads/xzzs-switch-boardviews-cracked.663854/post-10581574 (FlexBV free can be used to view them)

 

[jkyoho]

since you tested with know good screen and new connector still same issue, you prob should check connector pins diode reading if any bad.
for reference: