MOSFET swapped nbut showing
Led 1 2 3 4 are pulsing when power applied
But no turn on no more short...
Lenovochris
Member
Last Activity: 03-16-2025, 12:19 AM
Joined: 08-16-2024
Location: Northampton
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Lenovo 15arh05h 82b1 NM-D281 Rev 1.0 2020
Lenovo 15ARH05H Does not power on. 20v at charging port
Right Capacitor is getting too hot to touch around PU2001
Most surrounding caps have 0 resistance
Bottom cap reads nothing as well as the 2.2 resistor
2 caps on right reads no resistance
top capacitors read nothing
big cap on left of chip reads 000.8
I'm not great but i'm trying to learn.
Can someone point me on where i should be looking to target the correct faulty component
Would a shorting capacitor stop the laptop from showing any signs of... -
Thanks that's really helpful
Normally rs or AliExpress due to price.
I'll order 2 and get back to you when they arrive, thank you so much for your help so far👍...Leave a comment:
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I just found this on AliExpress:
￡4.59 | 10PCS Original/New AONR32340C DFN8 3X3 QFN MARKING 32340C
[url]https://a.aliexpress.com/_EwS6yFw[/url]
Would this be a suitable replacement for the MOSFET as I have some of these already
Thankshttps://I just found this on AliExpr... <br /> ThanksI just found this on AliExpress:
￡4.59 | 10PCS Original/New AONR32340C DFN8...Leave a comment:
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This is the mosfet if it helps at all...
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Ok so
Pq401 top pins, so in yellow on diagram read 000.0 resistance to ground
Yellow on resistor read 000.2 then drops to 000.1 then to 000.0
Capacitor reads 000.0 on yellow To ground
Sorry I don't understand the diagram but I appreciate it.
Thanks...Leave a comment:
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Top of resistor measures to ground 004.7
Bottom measures 000.2
THe 4r7 does look to have a line going down the centre of it. Like small damage I could be wrong
Capacitor in you board pic
Reads ol on right side and left reads 000.2 resistance to ground.
This capacitor gets too hot to touch when DC is applied.
Sorry if it's not clear...Leave a comment:
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Ok thank you I will check and post back results thanks👍Leave a comment:
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Lenovo 15imh05h no power no turn on
Lenovo 15imh05h doesn't turn on
After some poking around the motherboard once charger is applied 4r7 resistor in photo becomes too hot to touch,
My suspicions are that it's the MOSFET to the left of it,
I'm not the most experienced but I'm trying to learn can anyone advise in simple terms how I can test and identify the likely culprit, I understand 4r7 is getting hot because a lot of voltage is being passed through it.
Thanks... -
No longer does anything apart from fans spin for a second after initial power button press...Leave a comment:
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Does the bios look ok? Thanks...Leave a comment:
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dump added Thanks...Leave a comment:
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Bios request
15ach6h
PF47JGN6
Currently running GKCN65WW
Takes ages to fire up, power light cycles before booting in to windows with fan and CPU on full.
Then shuts off after 30secs.
Doesn't display image on discrete, but did on integrated.
Will get a bios dump later thanks
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Yes seems that way, thanks for your help....Leave a comment:
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Some more testing Lenovo detects a different serial number to the one my computer is.
I have display via hdmi but not on screen of laptop
Thanks...Leave a comment:
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Ah ok thanks
I've tried running it for around 5 mins with nothing connected apart from charger and 1 ram module
Keyboard lights up up fans spin for 3 seconds
Lights go out after a minute or so then fans kick in and the cycle repeats, all while having no display.
I'm not really sure where to start to be honest....Leave a comment:
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Unfortunately same symptoms although have caps lock light now as well. I've attached pic and a video....
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Thanks Will try now and le you know the result. Thanks...Leave a comment:
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Bios Request please
Lenovo Legion 7 16achg6 s/n PF30C3Z0
Keyboard lights come on, Fans spin for a split second, Esc/fn lock light stays on the whole time. No display. It is charging and i have power light, It post loops in a sense as it will wait a minute then spin fans again then stop then fans again.
Please see bios dump attached,
Many Thanks...Leave a comment:
No activity results to display
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