Re: need schematics NCP81218
Short question,
is it fine to replace a NCP81218P with a regualr NCP81218 ?
Bought it on AliExpress and the Notebook is still not coming on.
In difference to the old IC it just says NCP81218 below the manufactuar logo.
Thanks in advance!
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: Lenovo ThinkPad L13 18834-1M strange fault
(1) Vin with 12 V from my first post referrs to PWR_DCBATOUT_3D3V @ PU4501.
(2) Battery voltage flow I measured at BATT1 / F4301.
(3) 20V_VINT_IN at Q4202 measures 20.2 V too.
(4) PU4401 seems to be fine. No shorts around and the mosfets read in the MOhm range with exeption of Gate to Source (~170 KOhm). This applies for PU4403,PU4404 PU4405 and PU4406.
PQ4403 is fine. Everything is reading in the MOhm range.
(5) Will use now net labels...Last edited by cool-oase; 08-12-2022, 12:27 PM.
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Re: Lenovo ThinkPad L13 18834-1M strange fault
F4201 brings me 20.1 V. And the fuse is good!
F5501 is reading the 12 V and it is supposed to be 19V for the backlight.
True the resistance of the Voltmeter is also around 0.3 Ohm.Last edited by cool-oase; 08-12-2022, 10:49 AM.
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Re: Lenovo ThinkPad L13 18834-1M strange fault
Hi there,
the given values were correct. I simply messud up the given scale in the breckets. My Voltmeter directly outputs the correct unit.
So I removed the Mosfet(s) and both mosfets seem to be fine. I either read nothing between gate to source & drain or shortly sth. in the great MOhms.
Also I do not get any reading on the pads of the board, so I guess that's not the issue.
What brings a resistance of about 0.4 Ohm? ...
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Re: Lenovo ThinkPad L13 18834-1M strange fault
@mon2
Q4201
Source & Drain 15.22 MOhm (Meter set to 200KOhm)
Source & Gate 100.9 kOhm (Meter set to 20MOhm )
Drain & Gate 15.10 MOhm (Meter set to 200KOhm)
Q4202
Source & Drain 15.85 MOhm (Meter set to 200KOhm)
Source & Gate 100.7 kOhm (Meter set to 20MOhm )
Drain & Gate 15.40 MOhm (Meter set to 200KOhm)
Q4206 and Q4205 have similar readings, i think that's why
I rushed over it
Thank's...
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Lenovo ThinkPad L13 18834-1M strange fault
Hi People,
i have a really strange fault on a laptop, which i am reparing. It's a Lenovo Thinkpad L13 18834-1M.
Visually I could see that PU4501 (TPS51393RJER-GP) was burned so I removed the IC and ordered a spare part. Looking into Schematics showed, that the IC is responsible for the 3.3V rail. I noticed, that after removing the IC there is still a short on that bus (0.4 Ohm). Furthermore PU5201 & PU4551 are also short. Voltage injection showed a huge current drawn of up to 2.5 A but with only a slight temperature flickering at U4004 (TPS22976DPUR-GP) using ethanol....Last edited by cool-oase; 08-08-2022, 09:13 AM.
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Re: Lenovo x250 bricked, bios needed
u cannot use the bios from the lenovo updater. you need a bios dump. You can have a try with the attached bios dump file. It worked for me.
Before flashing compare Mainboard Names to ensure, it's the correct bios. EC will most likely not be required.
Good luck....
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