help me please toshiba qfkaa la-8391p

[mustafa007]

toshiba qfkaa la-8391p rev 1

power 5 seconds led worked with close

vcore not voltage
vram not voltage
there are 5v and 3v

[atsio]

Re: help me please

GPU or PCH. Probably GPU

[piernov]

Re: help me please

Check if you have PM_SLP_S4#, SUSP#, PM_SLP_S3#, SYSON and VR_ON signals.

[vedoza]

Re: help me please

UCL1 check pleas

[ozy]

Re: help me please

just had this fault and resoldered pu330, og1 and ucl1 and all working fine now.

[englez]

Re: help me please toshiba qfkaa la-8391p

Same problem,resoldered ucl1,working now.Thanks

[misiekelk]

Re: help me please toshiba qfkaa la-8391p

Wow.Resoldered ucl1,working now.Thanks

[paulosst1]

Re: help me please toshiba qfkaa la-8391p

Hot Air in ucl1 and the laptop revive!! manny thanks

[REpairAT]

Re: help me please toshiba qfkaa la-8391p

Worked for me, thank you friends!

[drissisimo]

Re: help me please toshiba qfkaa la-8391p

Don’t worked for me. Plz can you help me

[ranabp]

Re: help me please toshiba qfkaa la-8391p

Thank you sir, ULC1 looked fine, but resoldering it worked.
Cheers

[Kwisatz Haderach]

Re: help me please toshiba qfkaa la-8391p

Another UCL1 reflow and sucess!!
Thanks!

[kalu]

Re: help me please

UCL1 check pleas

No power on these pins... none

[kalu]

Re: help me please toshiba qfkaa la-8391p

Found, if the RTC Battery have less then 2,8v the computer won't work, I change Battery for other charged and pc turn on OK

[lxd4444]

Re: help me please toshiba qfkaa la-8391p

Hello, i have this problemfrom the discussion, I realized that it’s a good option to resolder ucl1, but I don’t understand where it is located on the motherboard, even according to the diagram that was thrown off above (an ordinary stupid student who wants to bring his only laptop back to life)

[mon2]

Re: help me please toshiba qfkaa la-8391p

Search for a small rectangular black chip that will have 4 solder pins on each side. For a total of 16 contacts.

This part will be 2mm * 3mm in size.

It is a TQFN package so will be a thin height, quad flat shape with no pins but with flat solder tabs under the chip itself.

Post picture of anything that may resemble this shape.

[Kwisatz Haderach]

Another Toshiba P850 that works after soldering UCL1
This chip provides clock signal for the RTC

[mon2]

Thanks so much for your update.

[szakacsa195]

+1 Another UCL1 reflow and success.

Thanks!

[Riggs_1]

Hello everyone, also reporting success with repairing this type of board. It came back to life after reflow UCL1 and battery replacement.