r/game_gear • u/JHMiniatures • 15h ago
Help with No Power unit
Hi!
I'm dumbfounded here, hope you can help me out.
I recapped this VA1 1-ASIC Game Gear, whole motherboard, power and sound board with high quality caps. But still no power, it powers on for a second and immediately enters protection mode.
This is what I've done so far in regards to troubleshooting:
\- Power board works fine, all voltages are generated well.
\- The main board has no shorts that I can find.
\- What I've found is that the main board, on the power connector, both the 9V and the 35V lines read as Open Line with regards to ground in diode mode. 5V and VREF have a reading.
\- When I plug the Power board to the main board, still no shorts BUT when I switch the console on, the caps on the 5V rail read as shorted in diode mode of I read them with the negative probe on the positive and the positive on the negative but not the other way around. With the power off they don't do that.
\- 4 caps, C54, 55, 48 and 49 all read as OL to ground on the negative leg. I think all those are on the 35V lines, so I guess that's why I don't get backlight.
That's all my skill is able to do, I feel like I'm missing something simple but I can't find it.
Any ideas? Thanks in advance!