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| Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead https://vlab.su/viewtopic.php?f=41&t=61094 |
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| eletmoraes [ 10 май 2017, 18:43 ] | |
| Заголовок сообщения: | Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
I've disassembled the whole notebook, I'm only working with the motherboard and the power supply. When I put the power supply on the DC jack I realize that the PU4503 gets so hot that I can not leave my finger too long in it. I measured the resistance on smd capacitor PC4528 and PC4529 and it is providing me with a resistance of approximately 2.2 ohms. I have already removed both and continues to provide me this resistance measurement on the motherboard. Is the defect not in the PU4503 itself? |
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| pyry [ 12 май 2017, 06:16 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
Try removing pu4503 and see if the short one disappears |
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| and555 [ 24 май 2017, 15:27 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
eletmoraes писал(а): Is the defect not in the PU4503 itself? It can be, but the easiest way to find the defect component, just apply a power supply from external source to it, and find component that get hot. And please don't apply a voltage more than it would be. |
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| eletmoraes [ 24 май 2017, 16:25 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
ok , I think this component is damaged because you just have to plug in the notebook's power supply to realize that the chip heats up a lot. |
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| eletmoraes [ 26 май 2017, 18:50 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
Between pin 1 and pin 8 of the PU4101 short-circuit I decided to remove the PU4101 mosfet from the circuit. After removal of this component, the short-circuit still continues. So I removed the capacitor PC4529 to check when I noticed that the short circuit is gone. I had tested the transistors PU4101 and PU4102 and they were ok. My question now is when the resistance value between pin 1 and pin 8 of PU4102 if it is 15 ohms. |
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| eletmoraes [ 27 май 2017, 04:34 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
Before removal of smd capacitor PC4529 had removed the transistors PU4101 and PU4102 to see if they were good, as it was ok I ended up using an external 5V source to locate the damaged component. By an oversight I ended up using the 12v voltage instead of using the 5v voltage from the computer source. Then I heard a small noise coming from the motherboard as a cracked semiconductor. When I went to examine the motherboard better I found 2 integrated holes, one of them would be NCP81172 and the other would be RT8237EZQW. I hope there is no other component to replace besides of RT8237EZQW and NCP81172. What can burn of components if, instead of 5v, use a 12v power supply between pins 8 of the PU4101 and GND? Could it be just the NCP81172 and the RT8237EZQW? |
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| and555 [ 06 сен 2017, 11:00 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
eletmoraes писал(а): What can burn of components if, instead of 5v, use a 12v power supply between pins 8 of the PU4101 and GND? Oww, a lot of components will be burnt if you apply 12v. For the safety, I usually use 1v - 3v, it will be enough. eletmoraes писал(а): Could it be just the NCP81172 and the RT8237EZQW? No, I think there are others. |
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| eletmoraes [ 15 янв 2018, 17:54 ] | |
| Заголовок сообщения: | Re: Dell Inspirion 5437 (D0e40-Hsw ddr3 12314-1) no power , Totally dead |
What is the best flux to facilitate the removal of the RT8237 and the maximum temperature to weld it? |
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