Re: Acer Aspire 5551 no power

I found short on PL26 and PQ3 \ PQ17. After exchanging short gone in this branch.
Current values with supply 19v on PL26:
Current intake: 0v
PQ5 : 19V on Drain 1.10v
PU4 l.8 VIN 0v
PQ55 – shorts G to S.
PL1 19V PL2 0V 1.6 M Ω
Pd17 C 18.33v A 14.85v
PD13 A19V C19V
PD3 C17.82V A 0V
PD1 C3.18V A0V
PD2 C18.38V A19V
PJ23 19V
PL15 19V
PQ31 – replaced.
Values on +3VALW:
Short on PJ1 in direction to EC ENE U26 (getting hot).
Values on U26:...

Re: Acer Aspire 5551 no power

Not good news

Removed PJ1 and did short-test , KBC got hot in 2.2V. Also, by supplying vin 19V PQ31 got hot so I removed from the circuit.

I have a feeling that it will be a big challenge to make this board working but at least I can learn a lot.

Re: Acer Aspire 5551 no power

Much appreciate your help! As soon I do as you suggested I come back with the outcome.

Re: Acer Aspire 5551 no power

Anybody have any suggestions where to start ?

As this is my first Thread I would like to welcome everyone and apologize for my English.
I have my testing laptop Acer Aspire 5551 with motherboard NEW55 LA-5912P Rev: 1.0.
Short story of this laptop. Laptop worked fine till I wanted add some ram and did not want to power up. After diagnosing I reprogrammed bios and found out that PQ31 had strange measurement outcome so I replaced and luckily laptop came back to life. There were still defects like there was no battery charging, U70 got very hot and laptop turned off after a while.
To make things worse, by mistake I made short...

Re: New Members - please post your introductions here

Hello Everyone, i came across this site via uncle google. I am very glad that finally I messed up my laptop because I have now more motivation to learn very exciting stuff and hopefully I can learn enough to fix it correctly. Take care everyone , Kris