Recent content by 2informaticos

So you don't get low reading between any coil and PPBUS_AON. You can resolder the main fuses. A working board can help to compare all the readings. Now check diode mode to ground on all small coils around both PMUs (U8100 & U7700). Which areas look affected by liquid?

Don't write end "V" on diode mode readings; avoid any confusion with voltage checking. The voltage you've read there is caused by current injected by multimeter (diode mode scale) into MLB; is not a voltage generated by MLB itself! "L5230 = 0V" Does this mean pure short (0.000)? You've...

Pufff, that points to bad NANDs...

OK, so the input circuitry is good. What is diode mode to ground on the side without voltage? Chreck it on all big coils also. Don't forget LN4/980...

Then is not mounted; schematic also mentions something about that. Check continuity for camera lines from MLB to TCON. You may have problems with JP600, or its cable.

Changed C7667 is not the problem. The machibe can wotk even without it. If you used hot air to replace it, the heat could affected the board somehow. Did you find any liquid sign on the board?

I meant to check voltage on both sides of mentioned "W" fuses; both removed, of course. I expect to get 12.3V one side (not on PPBUS_AON).

Page 66; not sure if is mounted.

Keyboard connects with trackpad through I2C_KBD_SCL/SDA. But keyboard has its electronics which may fail; apart of tracking problem with corresponding SCL/SDA lines processing. Incompatible KB/TP may also occur. For the feedback, TP requires PPBUS_AON. Just in case, check if this function isn't...

All LP680-5 coils are good? UP102 is not used?

So the problem is on PPBUS_AON side. Check the stable voltage on the other fuses side.

??? Impossible to have the same readings on ALL secondary coils! I don't have the correct schematic, but looking at 820-03286, did you really check (corresponding coils) L5800, LC320, LC710, etc?

0.177 shouldn't be a good value. I think 0.350-0.400 is expected reading. Check again 15s after power is removed.

ALS and keyboard backlight work?

Check all components and signals from page 94.