Re: Acer Aspire 5551 - AL-5911P motherboard - won't turn on

Thanks Highpulse,
I will test every voltage on the power rails and I'll post their value as soon as possible.
To to these tests I will disconnect the jumpers on the power rails, to separate each converter from the rest of it's power rail, as I did whith the +NB_COREP. I mean, first thing first, to check if there are other components shorted on the converter side.

Hi to all!
This is my first thread on this forum and I am a newbie in the chip component level repair.
I think the users skill in repairing will help me to solve my problem.
I'm trying to troubleshoot a AL-5911P motherboard that won't turn on. (I have uploaded the schematic)
The fan starts to spin and 2 seconds later stops.
I have already found the PQ30 mosfet shorted (AO4456), on the circuit of the buck converter PU8 (RT8209) that feeds the +NB_COREP power rail.
Without the PQ30 mosfet on board, the +NB_COREP power rail shows dead short yet, over the...

Re: New Members - please post your introductions here

Hi to all! This is my first post on this forum and I am a newbie in the motherboard component level repair. I do repairs as hobby, I have interest in every aspects of electronics, from the analogic circuits to embedded system. I think to electronic systems as a formidable puzzle to solve. I apologize in advance for my terrible grammatical mistakes.