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| Lenovo Thinkpad E580 (NM-B421) No 20v Input Solution https://vlab.su/viewtopic.php?f=58&t=128163 |
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| abuholm [ 21 авг 2022, 07:02 ] | |
| Заголовок сообщения: | Lenovo Thinkpad E580 (NM-B421) No 20v Input Solution [РЕШЕНО] |
Hello everyone, I'd been trying to fix this model for 2 days .. no short circuit anywhere, replaced NX20P5090 (because they tend to short out) but still 5v not converting to 20v, so I decided to study the PD controller U4201 (RTS5455) circuitry and stumbled upon the VMON line with R4208 resistor open and replacing restored the 20v. I hope it helps someone. |
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