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laptop charger led light goes off when plugged in to laptop and stays off until unplug from all. Laptop won’t turn on at all on battery or ac. Tore it down to the motherboard and found an are with shorted capacitor. Trying to eliminate possibilities and found an ic chip that is grounded on three pins and these pins are also group to the capacitors. Below is a picture. Also found manufacturer but thats it. Need help find information on chip and where those pins go. Thank you for your time and support.
Hi, I recently got a notebook with the same problem. Thanks to your post, I got on the right track on fixing this. The pins you marked shouldn’t be grounded. Therefore, there had to be a short circuit somewhere. According to the schematics there should be the chargers voltage of 19V. So I soldered a wire on these pins and connected my lab power supply. After feeding a current of 3A, I finally found a place which got hot. As it seems, the capacitors PC736 and PC734 were shorted. After removing them, the short was gone, the charger didn’t turn off again and the power LED on the board now flashes once every time I connect the charger. I just ordered replacement 22uF 0805 25V capacitors. I’ll keep you posted.
Hi, What is the board number of the motherboard? (printed on motherboard) Try searching online for “(insert board number) schematics”. Sometimes you can be lucky and find the schematics for the board which will have full details as to what each component is and how it is wired. Also I believe that the IC is a 4835D P-Channel mosfet going by the markings on the IC Here’s an image of the IC in the schematic (see p.68)
(click on image to enlarge for better viewing)
Two questions when you took apart the laptop did you unplug the battery before you unplugged anything else? and also if you have a multi meter see if it pulls anything at all or anything abscure. if you are able to find a schematics for the laptop and figure out what those all connect to ex. main power/display and so on. The capacitors themselves are eaisly replaceable if you know how to microsodder. But if you can tell me what that chip is called and everything its connected too i can do some further research and help out more
