Could I get some help reading this schematic?

[orientalsniper]

First off, PQ2 was shorted. So I replaced it with a new one.

And now PQ2 does not output any voltages in pins 5-8. I think it's not being activated since pin 4 in both PQ2 and PQ1 are on high (18v).

So I noticed there's some OCP/OVP protection circuit in page 59. I think the relevant parts are PQ35, PR6. But I don't know how to make sure PQ35 is fine since I never tested its kind before, though it passes diode test I think. Also it has 18V in pins 1,3,4,6.

[dj_ricoh]

Re: Could I get some help reading this schematic?

so your pq2 and pq1 will open with gate from PU3 pin 4 ACDRV#
if that chip its broken and does not output that voltage for the mosfet you will not have any power.

replace pu3 then you will have gate for pq2 and pq1

[orientalsniper]

Re: Could I get some help reading this schematic?

I've replaced PU3 with another one from a broken laptop, so I don't know if it's good or bad. But they had the same readings in all pins, the issue is, it takes me 2 weeks to receive any order from Ebay and I would rather confirm everything else is fine.

Since both these guys changed PU3, I assumed PU3 was fine:
https://www.badcaps.net/forum/showthread.php?t=36522
http://www.reballing.es/viewtopic.php?f=22&t=5358

I have to add if I short PQ2, computer runs fine with power adapter. Battery remains undetected.

[orientalsniper]

Re: Could I get some help reading this schematic?

So I had been reading the schematic, would it make sense if I remove PR140 and PR9 and then measure pin4 of PQ1 to check whether ACDRV# is working or not?

[orientalsniper]

Re: Could I get some help reading this schematic?

SOLVED:

Replaced PQ2 and resoldered PU3.

[dj_ricoh]

Re: Could I get some help reading this schematic?

perfect!
for chips like that pu3 I got a microscope to be 100% sure its soldered.
glad to see that it came on

[highpulse]

Re: Could I get some help reading this schematic?

there is a good technique to solder without using microscope . simpe remove all solder frmo the pins with solder wick in both part board and chip itself , leave on a very small amount on the central pin GND (very small , like the amount of solder of a 0,65 mm ball
give a bit of hot aair to make the bond on the GND , then apply flux on the 4 sides , and with your iron , gently drop a little big of solder in the iron , and pass slowly on the 4 sides with the iron , all pins will be perfectly soldered , without much need of microscope confirm , just with eye view you can notice if well or not well soldered .