Peter Toropov
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Last Activity: 05-17-2024, 03:31 AM
Joined: 03-01-2024
Location: California
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That's unfortunate to hear, but at the same time was kind of expected. Nevertheless, due to this "project" being an educational one to me in terms of how to troubleshoot things, practicing soldering and general knowledge gaining, I would like to try and resolve those high and battery rail shorts, if it is possible. -
Apologies for not replying for so long, had to catch up with school.
Checked HG again, just in case, got [B]no reading[/B] from it to GND.
Attaching the pictures of resistances from inductors to ground and a boardview.Apologies for not replying for so long, had to catch up with school.
Checked HG again, just in case, got [B]no reading[/B] from it to GND.
Attaching the pictures of resistances from inductors to ground and a boardview.Apologies for not replying for so long, had to catch up with school.
Checked HG again, just in case,...Leave a comment:
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I apologize for not replying earlier, I, sadly, don't have a variable power supply for voltage injection. Checked all the inductors, almost all of them gave a resistance of 0 ohms to ground. Should I make a list of one's that have resistance? Or both with resistance and no resistance?
Also, removed the mosfet connected to HG, PQH8901. Short to ground on IC HG pin, as well as on AC_BAT_SYS has disappeared. Resistance on AC_BAT is now 3.9mO. Checked the battery connector itself, BAT_CON to ground gives 0 Ohm resistance.
I have also received some replacement charger...Leave a comment:
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They all give 0 Ohms in resistance mode.
Will check in diode mode later as the multimeter I have right now can't measure diode mode.Leave a comment:
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Both the ACN and ACP are shorted to ground.
ACN: short
ACP: short
LG: short
SRN: short
SRP: short
HG: short
LX: short
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3234342}[/ATTACH]...Leave a comment:
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Removed PQ8901, resistances I got on PU8900 IC:
ACN:...................................0 Ohm (short)
ACP:...................................0 Ohm (short)
CMSRC:.............................4.55mO
ACDRV:..............................7.35mO
ACOK:................................1.1mO
ACDET:..............................4.25kO
IADP:.................................197.5kO
BATPRES:.........................99.3kO
TB_STAT:...........................19.85kO
BATSRC:............................8 Ohm
BATDRV:............................3.9mO...Leave a comment:
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PSU drops voltage to 0.3V and PQ8901 now has a short between source and drain...
New resistance measurements:
source-drain: 0 Ohm
source-gate: 256 Ohm
gate-drain: 260 Ohm
GND-drain: 5.1-5.3mOhmLeave a comment:
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Got 20V at PQ8901 DC_IN when measured to GND and 20V on PQ8902 CHG_PATH when measured to DC_IN.Leave a comment:
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I don't think so, looks more like flux residue that I was unable to wash off.Leave a comment:
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Alright, thank you for clarifying. I have replaced QM3058 PQ8901 DC_IN with AONS32306. Resistance readouts:
MOSFET-GND
5.2 mOhm
Across:
source-drain: 4 mOhm
source-gate: 3.9 mOhm
gate-drain: 1.435 mOhm
Should I now test with with power?Leave a comment:
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I did find an Alpha&Omega AONS32306, which has similar specs for drain/gate voltages, but maximum currents are way lower, than the ones on QM3058. Do they not matter?
[URL=filedata/fetch?id=3233566&d=1710257909][ATTACH=JSON]{"alt":"Click image for larger version Name:\timage.png Views:\t3 Size:\t118.6 KB ID:\t3233566","data-align":"none","data-attachmentid":"3233566","data-size":"thumb"}[/ATTACH][/URL] [ATTACH=JSON]{"data-align":"none","data-attachmentid":"3...Leave a comment:
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I was unable to find any substitute MOSFETs on other boards, so just ordered some M3058, they will most likely arrive in ~2 weeksLeave a comment:
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Measuring with [B]no [/B]power:
[B]1. [/B]The resistance measured from pins 5-8 (drain) on PQ890[B]2[/B] 19V MOSFET to GND is 0 Ohms
[B]2. [/B]Measuring across the PQ890[B]1 [/B]DC_IN MOSFET:
source-drain: 0 Ohm
source-gate: 0 Ohm
gate-drain: 0 Ohm
[B]2.1[/B] Across PQ890[B]2[/B] 19V MOSFET:
source-drain: 4.6 mOhm
source-gate: 0 Ohm
gate-drain: 4.6 mOhmMeasuring with [B]no [/B]power:
[B]1. [/B]The resistance measured from pins 5-8 (drain) on PQ890[B]2[/B] 19V MOSFET to GND is 0 OhmsLeave a comment:
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No no, I have replaced the cap, and nothing changed, the board was not charging the battery and the laptop was able to start up from just the power supply. It was after I replaced the charging IC that things went somewhere they weren't before. One of the capacitor's pads was ripped off, so it is bridged with PQH8601 MOSFET, which has the same pin AC_BAT_SYS as the capacitor had.
Unsure how to check the RAM supply, both RAM slots were working before everything else "collapsed".
Attaching both pictures of the cap and the IC...Leave a comment:
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GL702VM not charging/unable to power on
[B]Disclaimer[/B]
This is my first time at attempting such repair and troubleshooting, so I apologize in advance if I do something wrong or misunderstand some things. I will attempt my best to research more information to better understand everything.
[B]Issue[/B]
Laptop was unable to charge the battery, but was able to boot up without it, when powered on it had unstable CPU clocks while under load due to sudden throttling when reaching 70C. Upon visual inspection, a blown capacitor PCI8601 was discovered near MOSFET PQH8601, which has been replaced....
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