I had a look at my LCD ribbon cable again and sure enough 2 pins towards the top had their connections broken. I re-soldered them and check the continuity but still no luck. I have a variety of boards with the same problem though and the others don't show signs of wear near the ribbon cable. I'll try and post some images later. Hopefully there's something I can do; it would be nice to know what to trouble shoot with this issue.
1 Oct 14, 2018 5:52 am
Re: DMG black screen - no contrast adjustment (18 replies, posted in Nintendo Handhelds)
2 Oct 11, 2018 9:12 pm
Re: DMG black screen - no contrast adjustment (18 replies, posted in Nintendo Handhelds)
I'm having similar issues. Many years ago, I was new to soldering and whatnot and got my screen stuck in this state while trying to reconnect a front-light mod. I'm still uncertain how I got it there because the LCD ribbon cable is intact. Out of desperation I bought a capacitor kit which I did about 2 years ago with no success. I recently brought it back out to see what could be done.
I've followed the advice in this thread thus far but it hasn't resolved my issue. I'll list what I've done:
LCD board modifications:
* Installed new capacitor kit (C1, C2, C3, C6, C7, C8, C9, C10)
* Replaced 100 ohm and 1k ohm resistors
* Replaced 47uF capacitor C4 (not part of the kit)
* Transplanted tested-working potentiometer
* Resoldered the grounding contacts
What's not replaced:
* Diode D1
* Capacitor C5
* DA1, DA2, DA3, DA4 (Rectifier diodes if my research is correct)
Way way back I bought a lot of 5 LCD boards that were supposedly dead off eBay. Only 1 was damaged beyond repair so I do have some spare parts I can salvage if that's of help.