Lenovo Legion Y530 no power

[tikanot]

Hello i try to repair a lenovo legion Y530 with no power no led and no charge, i have change the ec from a working motherboard with no display and after change a short circuit is in the motherboard in PQ203 , in trying to find the short circuit i have kill pu201 , i have remove it and change pq203 , motherboard power on without pu201 with no led EC hot and cpu hot and pu201 hot too i have shutdown , after an other mosfet dead pq202, i have change all the mosfet take from the other motherboard and change PU201 and PU601 because hot too. I wait for mosfet to change PQ202, but when i change how to check all is good before plug the charger to test, i can kill all the time mosfet.

[SMDFlea]

Re: Lenovo Legion Y530 no power

Post a link to the schematic if its been posted on badcaps,or post it as an attachment.

[tikanot]

Re: Lenovo Legion Y530 no power

yes i have the boardview and schematic

[lapfix]

Re: Lenovo Legion Y530 no power

Hello
At first , why you change EC !

With no power , no charger , no battery no Cmos coin , With multimetre at diode mode , red probe at GND and with white black probe take all the measurements at All the grey coil ,Pr201 and post it here

[tikanot]

Re: Lenovo Legion Y530 no power

i have change ec because no power no led and all voltage is good no short circuit.and all big mistake done after change ec
see pr201: .001
PL601:.741
PL602:.001
PL201:.000
PL1401:.291
PL3102: .007
PL2101:.001
PL1801:.159
PL5802:.002
PL5801:.004
PL5803:.004
PL901:.107
PL3201:.006
PL3011:.005
PL3001:.004
PL3002:.006
PL3003:.003

[lapfix]

Re: Lenovo Legion Y530 no power

No power doesn't mean change IO !
From your read it's clear that you still have a short to ground somewhere at your motherboard.

If you remove PR201 , the short is from wich side ! side of the 2 first mosfets or no .
With diode mode can you give the read on this mosfet : PQ601

[tikanot]

Re: Lenovo Legion Y530 no power

I have say pq202 is short but i wait receive new one
see for PQ601:.001

[lapfix]

Re: Lenovo Legion Y530 no power

PQ601:.001...from wish side !! drain , source!!
Can you test pq601 with diode mode and post the result
remove PR201 , the short is from wich side !

[tikanot]

Re: Lenovo Legion Y530 no power

pq601 both in drain and source .001
i have do mode diode in pq601 and .001 in source to drain

[tikanot]

Re: Lenovo Legion Y530 no power

i have change pq601 and no i have pr201 .498
pl601 .550
pl602 .001

[lapfix]

Re: Lenovo Legion Y530 no power

Good , now you still have short at the 3valw line.
This 3 volt supply many others components , inject 1v/1amp at Pl602 and search wich components get hot , if not found increase the voltage by steps until max 3v / increase ampere too

[tikanot]

Re: Lenovo Legion Y530 no power

i need to buy the psu this one is good for doing this https://fr.aliexpress.com/item/10050...c00y38pei&mp=1
30V 10A 3digit i have see
or you know one better a better price

[tikanot]

Re: Lenovo Legion Y530 no power

hello i have receive the psu , and i putt 2V in pl602 and only chipset is hot and no other component and now psu putt in cc i can only putt 0,80V

[Conste]

Re: Lenovo Legion Y530 no power

When only the chipset gets hot you have the error.

Resistance to ground of this line?

[tikanot]

Re: Lenovo Legion Y530 no power

i have put 5V too in pl601 too , and i have PU601 little hot.

[tikanot]

Re: Lenovo Legion Y530 no power

i put power in pj3201 after the two first mosfet i go to 17v and no 3V and no 5V only PU601 hot. it's ppl of my familly say it's change the ec , i think maybe ec is dead and kill pu601 it's possible?

[tikanot]

Re: Lenovo Legion Y530 no power

i remove the ec and i see flux so that ec is change, i change pu601 again , and i put 19V in pj3201 and pu601 go hot, i put 2V in pl 602 and i got pch hot, i think pch is short

[Duc Nguyen]

hello everyone, my mainboard not cpu power at PL3003, PL3002, PL3001. I'm thinking pu3003 error, please help me . Thanks