Electronics > Repair
laptop power IC died, help iding it, yQDQA/yQDQ4 marking, acer ph315-55
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Anthocyanina:
yes, i've been trying to find it, no luck yet. thanks! it is a hh53a la-l992p rev 1c if anyone could share the schematic or has it and can give me the part name. thank you!
DavidAlfa:
LA-992 r1b schematics, I don't think it's very different from r1c?

The pinout of the SY8388BRHC seems identical.

https://www.aliexpress.com/item/1005003630991643.html
Anthocyanina:
and it is the yQ part. thanks a lot David!
fzabkar:
FYI, I notice that the "B" part is a fixed 3V regulator whereas the "A" and "D" parts are variable, and have slight pinout differences.

https://datasheet.lcsc.com/lcsc/2207201830_Silergy-Corp-SY8388ARHC_C5110279.pdf
https://www.semiee.com/file/SILERGY/SILERGY-SY8388D3RHC.pdf
Anthocyanina:
alright, tonight i'm finally able to work on this. I've removed the bridge PJ302 which makes the output of that supply available to the system, but now, between +3VALW and ground, a 1 ohm path remains. between the output of PU301 and ground, it's a direct 0 ohm short, measures 0.1 ohm on my meter(same as shorting the probes) so this 1 ohm i measure between +3VALW and ground must be from something else that died that is connected on that rail. I've gone through the schematic probing at everything on that rail that i can find by eye, but i haven't been able to find all the ICs or other components connected to it.

searching by eye becomes very tedious, so, does anyone have the boardview and would be willing to share?

i'm completely broke and can't afford the ~10$ repair websites charge for it. this is not a job, i'm repairing this laptop for myself. i got it from a friend for very cheap cause it has some physical damage(it's bent and has some serious dents behind the display) so it's something i really would love to be able to fix it as i can't afford another laptop, much less one like this one, so any help with the files is extremely appreciated.

thank you all!
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