Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

[mattpd]

Schematics here:

AC adapter had 19v, but when you plug it into the laptop it drops to 0v, so I started hunting for a short. I was able to find PQ6 or PQ7 shorted. I removed both and now 19v is present at the laptop. Unfortunately there is still a short somewhere else down the line. The 19v can be measured at the source of PQ6, but there is no gate voltage and also no drain voltage.

I can detect the short to ground on the pin 2 and 4 side of PR14. I can detect it on many of the inductors like PL3, PL7, PL13, PL17, PL22, PL24.

Where should I be looking for this short?

[dj_ricoh]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

you need to inject 3-4 v in the line.

on those pads where you took of the fets solder a wire and connect it to a PSU and give it a minute and it will heat up.

this method i use for every short finding.

when i close and feel the heat i use IPA and the shorted component will evaporate the IPA

[Pragmatiko]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

you need to inject 3-4 v in the line.

on those pads where you took of the fets solder a wire and connect it to a PSU and give it a minute and it will heat up.

this method i use for every short finding.

when i close and feel the heat i use IPA and the shorted component will evaporate the IPA

great...

i am thinking to buy an infrared camera (spend many money)

[dj_ricoh]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

I wish i had that amount of money for that thermal camera

[mattpd]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

you need to inject 3-4 v in the line.

on those pads where you took of the fets solder a wire and connect it to a PSU and give it a minute and it will heat up.

this method i use for every short finding.

when i close and feel the heat i use IPA and the shorted component will evaporate the IPA

Only 3 or 4 volts? As far as I can tell the short in on B+ rail which is 18v, right?

[rookieme]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

If it has low resistance a 1,5V battery cell usually does the job, if not I use a 18650 lithium 3,7V+.
It should be a shorted capacitor....

[dj_ricoh]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

It's more likely to be a and cap.
That cap its rated 2.5v so you need more then that to make it great up faster.
3-4 from psu 1amp to 1.5 will heat that sucker in 1-2 min.
Use IPA to confirm

[mattpd]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

If it has low resistance a 1,5V battery cell usually does the job, if not I use a 18650 lithium 3,7V+.
It should be a shorted capacitor....

Sweet. A 18650 worked perfectly. Shorted cap found and removed which cleared up the board of shorts.

How do I go about replacing it though? It's unmarked, so without some board view software I can't tell it's original value.

[rs232killer]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

Hi
we use a Flir camera to find badcaps

regards
RS

[cyberhack]

Re: Gateway NE56R10U (Compal P5WE0 LA-6901P) need to find short to ground.

I'll stick with the finger test,as them flir camera's are expensive.