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| SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. https://vlab.su/viewtopic.php?f=55&t=50259 |
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| notemaster [ 01 сен 2016, 13:29 ] | |
| Заголовок сообщения: | SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
hi, i have laptop sony SVF14N2J2ES, motherboard: da0fi2mb6d0 ref D, it was awash, after i clean the motherboard, i check the VA+, VIN line and 5/3Valw line and there is not short circuit, but there is nothing on line VA, the 19V is on PQ34 on 1-2-3leg, on 4 leg is 19V, but on 5 there is 1,1V, i replacer charger BQ, i check all small elements on line VA+ i replaced PQ35 and still nothing, i put tensios 3,3v on 5 leg pq35 and nothing change, after delete the pq35, 19V show up on 5 leg PQ34 and on 4 leg PQ34 there is 9,8V, i attached 1 page of schematic, can anybody help with this ? what i should check or replaced ? thanks for any help. |
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| paki [ 01 сен 2016, 13:45 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
Try shorts pins1,2,3 and 5 of PQ34 and plug-in 19V from DC Power Supply. Then test +3.3V & +5V. |
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| notemaster [ 01 сен 2016, 14:33 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
on 5 leg PQ34 ther is signal DC/-C and it out from kbc NPCE985L, so are you sure that there should be 19V ? |
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| paki [ 01 сен 2016, 17:25 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
PQ34 working as switching, close/open. If this open, 19v must be on 5 pin. |
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| notemaster [ 05 сен 2016, 00:30 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
hi sorry, i haven`t time to reply, ok i put 19V everything is ok, but i want to resolve the problem not avoid obstacles, s what you think is damage ? why i don`t have 19v n 5 leg ? |
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| paki [ 05 сен 2016, 10:50 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
test -VAOFF DC/-C PQ35 PQ34 |
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| notemaster [ 05 сен 2016, 12:47 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
i replaced pq34 and pq35, but no result that`s why i`m looking for help. |
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| paki [ 05 сен 2016, 22:21 ] | |
| Заголовок сообщения: | Re: SVF14N2J2ES (da0fi2mb6d0) No power on VIN line. |
test signals -VAOFF DC/-C One from this closing PQ34 |
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