I will spare you the technical details…
If you have a PO that does not power on, or one that powers on but resets when you press a button, grab a pair of tweezers and bridge the pads below. If it starts working, solder a wire in place.
I literally just repaired 10 dead POs with this fix.
Best of luck.
Wait…you had 10 dead PO’s!?
October 24, 2022, 12:31am
not spare us the technical details.
There should be a direct trace from 3V to that pin of the pot.
How did yours get disconnected?
There is a transistor between the battery and the pot. I assume it’s a buffer.
Now I just need a source for replacement displays.
i think maybe thats the LDO voltage regulator?
The 5 pin ICs next to and above the appear to be voltage regulators, but the 3-pn IC is only connected to the one above. It’s possible that it’s for reverse polarity protection.
Here’s a good resource:
Custom LCD display EFM32LG890F128G (Cortex-M3, 48MHz, 32KB RAM, 128KB Flash) CS42L52CNZ Cirrus Logic 24-bit Codec (stereo ADC and DAC) 48MHz main clock xtal 32KHz Epson watch xtal 2.5V LDO regulator...
ah my mistake then
knew it was either that or the 5 pin
interesting that they use both the 3v and whatever v the voltage regulator is spitting out
woulda thought otherwise
anyway way to go!
November 1, 2022, 11:33am
Thank you for the tip - managed to fix my PO Office after a couple of years of it being dead.