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| lenovo g780 (LA-7983P) no power no charge https://vlab.su/viewtopic.php?f=58&t=55966 |
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| sebuncle [ 19 янв 2017, 01:07 ] | |
| Заголовок сообщения: | lenovo g780 (LA-7983P) no power no charge |
Hi , laptop is dead no sign of life ,i tried other bios nothing change. power come to PQ301 and PQ302 There's no +3VALWP what i have to check ? Best regards |
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| 2N3904 [ 19 янв 2017, 11:30 ] | |
| Заголовок сообщения: | Re: lenovo g780 (LA-7983P) no power no charge |
sebuncle писал(а): what i have to check ? Voltages at: B+ +3VLP VL and check the resistance between +3VALWP and GND. |
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| sebuncle [ 19 янв 2017, 14:28 ] | |
| Заголовок сообщения: | Re: lenovo g780 (LA-7983P) no power no charge |
Hi , B+ = 20v (take on PJ401) +3VLP = 3.3v (take on pin 8 PU401) VL = 5v (take on pin 17 PU401) resistance between +3VALWP and ground is 9 ohm (i think it's not correct ?) I don't see any hot component Best regards |
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| 2N3904 [ 19 янв 2017, 14:38 ] | |
| Заголовок сообщения: | Re: lenovo g780 (LA-7983P) no power no charge |
sebuncle писал(а): 9 ohm It looks too low. You can find where short circut is, using regulated power supply unit, if you know how to do it. |
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| sebuncle [ 19 янв 2017, 14:42 ] | |
| Заголовок сообщения: | Re: lenovo g780 (LA-7983P) no power no charge |
2N3904 писал(а): sebuncle писал(а): 9 ohm It looks too low. You can find where short circut is, using regulated power supply unit, if know how to do it. i apply only 3v on pin 1 with 0.5A , and 1A , and 1.5A and... , so i'll find short it's right ? Thanks Best regards |
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| 2N3904 [ 19 янв 2017, 14:53 ] | |
| Заголовок сообщения: | Re: lenovo g780 (LA-7983P) no power no charge |
sebuncle писал(а): it's right ? Yes, that's right. ---------- Добавлено спустя 1 минуту 25 секунд: ---------- The damaged component will be heated. |
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