Re: Acer swift SF514-51-74X1 Compal LA-D591P Freezing on boot

Spent few hours testing this laptop again. Still no idea what might cause VCC_CORE to drop from 1,15V to 0,73V. Drop is due to PU8101 PWM_1a duty cycle drop. What tells PU8101 duty cycle to decrease?

Hi,

Need schematic and boardview for HP envy
Model 13-ag0001no
ProdID 4PM88EA#UUW

Motherboard:
Cinna 13'' AMD RR
17885-2.
448.0EC05.0021

Thanks!

Re: Acer swift SF514-51-74X1 Compal LA-D591P Freezing on boot

So I replaced PQ8201 (+VCC_GT) and PQ8202 (+VCC_CORE) mosfets. Symptoms are still the same.

Is there any testing software I could try to troubleshoot this? I have run Pc-Check V6.21 and all tests pass except DMA Controller Tests and System Timer Tests. This is however quite old version of pc check, and I have run it on other working laptops with those two tests failing.

What happens, when OS logo appears and system hangs?

Re: Acer swift SF514-51-74X1 Compal LA-D591P Freezing on boot

When VCC_CORE drops from 1,15V to 0,73V, it drops because pwm duty cycle driving the fet from PU8101 drops. So I think the fet is fine.
What you mean by clock ic?

Compal LA-D591P schematic & boardview...

Hi,

Few months ago I got a faulty Acer swift laptop. Original fault: No power, not charging. I found out, that a MLCC (PC303) was shorted to ground at charging circuit HIDRV fet (PQ305). During troubleshooting I broke other fet (PQ306) in half when removing it.

I replaced both fets at the charging side, (PQ305, PQ306) and the shorted cap (PC303). Laptop booted with AC power, but still not charging. I ordered charging IC (PU301). While waiting for new IC, I did a fresh install of win10 and ubuntu to a new nvme disk. Everything working ok, except not charging.
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Re: New Members - please post your introductions here

Hello all.

Need help with a laptop repair, so posting this to get my account open