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Closed Aspire 4750 No Power, No Charging indication (JE40 chassis)

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ramil17

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Good day ka PH. I've been doing more electronic and computer repairs for so many years but this is the first time I'm sharing this experience via social media.

Acer Aspire 4750, No power at walang charging indication. Power adapter voltage will drop to zero when you plug in to laptop DC jack. This kind of problem may vary from different model of laptop. Shorted problem may caused to no power and no charging indication. No charging indication is different from not charging indication. NO CHARGING INDICATION meaning no LIGHT comes up in charging indicator while NOT CHARGING INDICATION the light indicator will lit but the battery will not be charge. At this point of time hindi ko naisip to take a picture first before ko buksan ang unit pero ng mahanap ko ang salarin naisip ko na ibahagi ito sa mga Enthusiast.

The first thing I did matapos ko buksan ang unit ay hinanap ko muna ang mga shorted components usually capacitors lang yan and it also usually focused on Power supply controller section. So the first thing you will do on this is to look for the shorted capacitors. If found almost all power filter CMD capacitor is shorted just find the main power controller IC, defective capacitor placed mostly closer to it. Please see attachment for reference. Hope this will help..

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Thanks dito ts pwede din siguro i apply sa ibang laptop na walang power.
Pwede yan basta same lang ang symptoms. lalo na pag nawawala ang DC out ng power adapter pag nilagay sa laptop. Plug and unplug nawawala-wala ang dc output ng power adapter pag ikinonik sa laptop yan na yon. Try to observe din sa part number ng controller.
 
hindi ba diode yun sir? 🤔
Hindi yan diode paps, ang SMD diode ay may hugis na puti sa dulo. Meter reading for good diode should have no reverse direction while capacitor in good condition has reverse direction. Diode physically is in black color.
 
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