HP no power (chip level) help!!

[atiqfajar]

Hello,

my laptop hp-cq41 has stopped working recently so i've try alot of solution but it seems like not to work...

symptoms : - split second light
- no power

i have attached some image that might help to find the problem

on number 1 box, on s0 state, it is quite hot but other component like cpu, gpu and bridge seems not working

on number 5 box, there is some voltage drop at the output pin... from 3v to some 1v-ish

Any solution is welcomed

TY for your time... help me find the problem

[mielta]

Re: HP no power (chip level) help!!

Hello
i send you the schematic

[dreamer_x_x]

Re: HP no power (chip level) help!!

hi bro,
is your motherboard ground with PL (coils) measure short circuit ? check it.

[keeney123]

Re: HP no power (chip level) help!!

So using the supplied info from mielta I would check and verify the modifications are correct and up to date. On the modifications I would be looking with what is failing. So too verify: in the So State you have all the voltages on page 3?

[atiqfajar]

Re: HP no power (chip level) help!!

Thanks @mielta.. but i don't quite know how to use the schematic... Because this is my first time attempting fix at chip level

@dreamer_x_x the coil near the overheating chip is around 1600++ ohm.. so i assume no short.. thanks

[atiqfajar]

Re: HP no power (chip level) help!!

@keeney i couldn't tell which is B+ or anything because in the schematic, there is no guide like the pq102 or pu etc... Thanks

[keeney123]

Re: HP no power (chip level) help!!

[QUOTE=atiqfajar;705966]@keeney i couldn't tell which is B+ or anything because in the schematic, there is no guide like the pq102 or pu etc... Thanks[/QUOTE

Yes there is on page 43. Once you save the PDF schematics go to edit. Click on edit. Look down to the word find. Click on find. Now a pop up on the right side will appear. Put in pq102. Then press the button enter.

Now if you want to find B+ do same above procedure but insert the B+ where you but the pq102. It will find B+ and when you press enter again it will find the next B+ on the schematics and so on. This works with most schematics however it is dependant on who made the PDF.

[atiqfajar]

Re: HP no power (chip level) help!!

Sorry for late reply, the PU301 is overheating and the voltage reads at each pin at s0(off) are :

(v)
1 1.2
2 no reading (0.019)
3 2.1
4 2.1
5 0.3
6 1.1
7 3.5
8 3.5
9 8.5
10 3.3
11 3.3
12 0
13 3.1
14 2.1
15 0(ground)
16 12
17 5.3
18 5.3
19 0
20 5.3
21 5.1
22 10
23 0
24 5.3
Tell me if anything is wrong with the readings