Dell n5010 dg15-09909-1 mb

[mcplslg123]

No apparent shorting on the mb. no 3v/5v present. I replaced PU4601(51125) and replaced sio still same. Pin23 of 51125 is not giving 3v powergood signal. I injected 3v from psulab , no componenet heated up.

On ething i have noticed is that resistance connected to pin23 of 51125 shows 2.2k whwereas it should so 97k approx. If vi remove the ic resistance rating becomes 97.

I have tried putting up 51125 from working mobo and after soldering the ic resistance shows 97k. the moment i give power to mobo resistance shows 2.2k.

What can be wrong??

[razu]

Re: Dell n5010 dg15-09909-1 mb

You have LDo voltage, around the power IC 51125 .....3.3v and 5V found...if not change 51125 Ic ...

[mcplslg123]

Re: Dell n5010 dg15-09909-1 mb

Thanks for your reply razu. The problem is i dont have 3v/5v on this mobo. I have tried changing the following ic's
01. 51125
02. 51116
03 charging ic
04. Sio

Still no 3v/5v. I have checked all the mosfets-nothing abnormal and my power board is tested ok.

Checked resistors near all ic's and seems to match with schematics.

Wondering why 3v/5v power ok signal is not enabled on 51125.

Can anubody guide me the preconditions to enable 3v/5v pok signal on 51125??