Asus X53U: Instantly Cuts Off

[speedypro]

Yet another laptop that cuts off as the power button is pressed.

When you press the power button, its led is lit and after 2-3 seconds the laptop cuts out. Same issue with and without battery. Also same issue when the MM is out of the laptop's housing. Any tips on where to look?

Regards

[speedypro]

Re: Asus X53U: Instantly Cuts Off

Just did a reball of the gpu and same issue. Just though a ball maybe grounding as this sort of issue is the same with most hp I have worked with. But wondering if the cpu needs reballing.

[spidey]

Re: Asus X53U: Instantly Cuts Off

Check coils for a short.

[speedypro]

Re: Asus X53U: Instantly Cuts Off

Yes. Thanks for the tip. Totally forgot about coils. So far two are shorted. See images:

PL303:



PL202:



Any replacements around?

[Francisco.s]

Re: Asus X53U: Instantly Cuts Off

Yes. Thanks for the tip. Totally forgot about coils. So far two are shorted. See images:

Any replacements around?

Are you asking for coil replacement?
How many ohms can you measure between coils and GND?

[speedypro]

Re: Asus X53U: Instantly Cuts Off

Are you asking for coil replacement?

Yes.

How many ohms can you measure between coils and GND?

PL202: 14.5 ohms
PL303: 67.2 ohms

[kc8adu]

Re: Asus X53U: Instantly Cuts Off

you need a ringer to test these for shorts.your ohmmeter will not spot 1 shorted turn.

[speedypro]

Re: Asus X53U: Instantly Cuts Off

you need a ringer to test these for shorts.your ohmmeter will not spot 1 shorted turn.

Many thanks for your support. How to locate these Ringer Testers? Any brand names?

[jpdo]

Re: Asus X53U: Instantly Cuts Off

I have the same problem but in one toshiba, and i dont know the problem.
You try clean the logic board?

[fddizon]

Re: Asus X53U: Instantly Cuts Off

testing for shorts with reference to ground, does not mean a coil is shorted. 14 ohms is not shorted for me. you can isolate those coils from mobo, to determine which side of the coil has short. someone told me capacitors near the coils are the most common parts to fail. i see electrolytic caps, make some tests.

[speedypro]

Re: Asus X53U: Instantly Cuts Off

...someone told me capacitors near the coils are the most common parts to fail. i see electrolytic caps, make some tests.

Ok. I'll see what I can find and report back.

[speedypro]

Re: Asus X53U: Instantly Cuts Off

I have done another test. This cap beside the coil in red:



...that tested at a very microfarad, 11uf; while others, same, are 200+uf. Could that be an issue?

[speedypro]

Re: Asus X53U: Instantly Cuts Off

I have removed the cap beside this coil. However, I get a short to ground on both sides of this coil. Does this means the coil is bad?

[DJduck]

Re: Asus X53U: Instantly Cuts Off

Replace it just in case it is bad

[speedypro]

Re: Asus X53U: Instantly Cuts Off

Replace it just in case it is bad

Ok but I have never bought those coils before. Searching with the number on the coils give me no information.

[fddizon]

Re: Asus X53U: Instantly Cuts Off

I have removed the cap beside this coil. However, I get a short to ground on both sides of this coil. Does this means the coil is bad?

Nope. You need to remove the coil to determine which side of the pads has the short.

if one side is shorted to ground, check the parts connected to that line.
removing each part at a time and testing to ground after each removal. just remember to put back parts on the same spot and in correct orientation.

[speedypro]

Re: Asus X53U: Instantly Cuts Off

Thanks! Good tip. Based on the schematic, PL202 (pin 2) is connected to the cap (PC218) and +APU_CORE_NB. The cap was removed and same thing. What is this "+APU_CORE_NB"?

[fddizon]

Re: Asus X53U: Instantly Cuts Off

speedypro,
have you remove the coil to test which side is shorted?

[speedypro]

Re: Asus X53U: Instantly Cuts Off

speedypro,
have you remove the coil to test which side is shorted?

Yes. While coil is off, pin 2 is short, that's the same connection (pin) where the +caps is on.

See image PL202 and PC218:



Also short is the cap's - and +. (Cap is removed)

[fddizon]

Re: Asus X53U: Instantly Cuts Off

check pc222 and all caps along that line... doyou see it? pc222 line going down maybe more parts along that line

can u post the schematic?