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OZinPattaya

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  1. Back in the day I used to do some component-level work on circuit boards. It sounds to me like you have a short (although usually what happens with laptops is that the adapter will shut off the moment you connect the adapter plug to the laptop DC jack). Trying to figure out which of the thousands upon thousands of IC's on the motherboard is causing the short can be extremely difficult. A shorting chip almost anywhere on the board, whether or not it has anything to do with a power circuit, can cause the whole board to test shorted with a continuity meter. We used to hookup a benchtop power supply (which could not be turned off by the motherboard over-current protection) to the motherboard and literally see which chip got sizzling hot (a good sign, but not foolproof as to which chip was causing the short). Any repair shop should have a universal power supply to test the adapter in a jiffy. Unlikely, from your description, to be the problem. You can rule out the blown fuse. There usually is no such fuse to begin with (that would make too much engineering sense), and a blown fuse would create an open circuit, not a short (and so would not cause the adapter to shut off). A bad DC jack can certainly cause a no-power problem but wouldn't cause the adapter to turn off. I think you can safely rule out the DC jack. A bad power jack would likely cause an open circuit. There are laptops now with internal batteries (non-cartridge) that simply will not power on even with the adapter if the battery has gone bad in certain ways. A possibility. But why then would the adapter turn off? Again, sounds like a short. Sophisticated board-level repair shops sometimes use expensive FLIR cameras to identify the shorting chip. Otherwise you "current blast" the short with an external power supply and keep ramping up the amps until something starts to smoke. Sometimes you get lucky and it's a redundant capacitor which fries under the load and, voila, working laptop. Not exactly scientific but sometimes it's your best bet to resurrect a dead board when all else fails. Whether a failed chip results in an acrid odor depends on how bad the chip has fried. It's almost better when it does fry badly, makes it easier to identify on the board. No stink and most likely everything will look fine visually to the technician. There are hundreds, if not thousands of chips on the motherboard (not just two or three) responsible for the various power circuits on a laptop motherboard (if you're going to include the small armies of multi-layer capacitors and resistors involved in such circuits). 2/3rd of the entire motherboard deals with dishing out power. Could be any of these that went bad. I can't comment on the technical prowess or Thai computer technicians but if some component on the motherboard is shorting it's most likely a mosfet or some "footless" IC and I doubt a Pattaya tech is going to have the knowhow, schematics, pricy rework equipment, optics, or part sources, to do the job. Although maybe I'm wrong and Thai PC techs are as resourceful here as the scooter techs. Anyway, good luck.
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