Dell power jacks are notorious for losing the solder connections. If all else fails remove the motherboard, use a solder wick and remove the old solder and resolder the connections. There are four pins that are close together so you need to make certain you do not over solder. Hope this helps
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These laptops are notorious for developing battery issues. We've got one at our house that would basically be a paperweight without a charger and external monitior. The best fix for this is to buy a new battery.
Unplug your battery and then plug in AC adaptor and see if laptop powers on. I assume you power button doesnt turn on at all? If so, your motherboard seems to have a power issue. Unfortunately, you have to replace motherboard. If laptop. powers on withour battery then you then battery needs replacement.
hi I also have 2 D600 and already disassembled them a couple of times :)...I think this might be wrong with your d600 since it doesn't work with the battery either: under the grey plastic cover with the power on/off buttons and the volume control buttons there is a small electronic board which is attached to the mainboard only by a plug and a socket, so it is removable...a very common problem in the d600 is this connection: either this small power board is simply broken, which is very unlikely unless it suffered heavy external damage :)...or whats more likely, that the solderings of the plug to this board lost their contact OR that the solderings of the socket on the mainboard itself are old from wear and also lost contact and don't conduct anymore :P....I have this problem in 2 d600 but not with the power button but only with the volume buttons :).... you can try the following to test if this is the cause: take off the grey hinge cover with the buttons and press a little bit on the right corner of the power board and try, at the same time, to power it on by pushing the fourth of the buttons if you have trouble taking off the hinge cover or any other questions, or if you find the problem, just send me an email...I'm glad to help...I can also provide you with some helping pics to disassemble the stuff :) email@example.com
Try removing the Battery from the System.... There is a power indecator on it....... Push the button on the battery Five lights full battery.... No Light Dead.... If Dead Your Power supply might be at fault....
Is the power Supply Light Lit? If No.... Bad Check connections..From Wall to Brick ect.... Still No... PSU Looks Bad....