Having problems with your Acer Aspire 5920-6727 Notebook ?
5920 will not turn on, adaptor green light brinks
\015 Tried power reset suggested by Acer tech support site with no success.\015
The Aspire 5920 and most other acers with the same logic board style are notorious for component level power issues. The first possibility is a severed connection in the DC connector cable. Its somewhat rare but it happens. The connection is broken right where that cable meets the back pin of the DC connector. This can be easily resoldered and your problem is solved. Becuase the AC adapter is blinking this makes me think that there is a shorted component on the logic board. If you have access to a multimeter set it to check voltage, remove the large panel on the bottom case (4 long screws). Then remove the fan (3 small screws) and the heatsink (4 custom screws). Once these are all removed you can look at the back side of the DC connector and see the cable. The cable consists of 4 wires, 2 black, and 2 brown. Black are ground lines, and brown are power. Using your multi meter (1 lead to ground and 1 lead to power) see what voltage you have right at the logic board side connector for this cable. If this is not the cause of your problem you should see ~19v. If yousee less, or nothing at all, its likely that either your AC adapter is bad, or the cable has been severed on the DC connector side. The last possibility (the one I feel is the cause for your issue) is that you will see a pulsating voltage. This means you have a capacitor short on the logic board. There are quite a few possible caps on the board that could short out like this. The picture below shows the 2 most commonly shorted caps on this logic board. Use your meter to check continuity between both sides of these caps, if you gen full continuity then the cap, one in line with it, or another in the circuit is shorted. Remove both of these caps and then meter the 2 pads beneath them in the same way you metered the caps. If you do no receive full continuity anylonger, then 1 or both of those caps were the cause for the short. You can also meter the caps themselves off of the logic board and if you receive full continuity the cap/s are bad. If you have removed the caps and still register a short on the logic board, then its time to strip the machine down and remove the logic board, repeat these steps with all ceramic capacitors (like the ones in the picture) until you no longer register a short. Just as a side note, after removing components from logic boards you must wait until it cools to room temperature otherwise your mulitmeter readings may be inaccurate.
To remove these capacitors properly you would require a hot air tool or an iron capable of working with lead free solder. These are expensive items so I do not expect that just anyone would have then lying around. These caps are redundancies within the circuit and aren't vital to the logic board. They can be removed and do not need to be replaced. If you're feling bold you can litereally take a pair of needle nose pliers and break the capacitors off of the logic board. Make sure not to pull them off, you want to crack them in half and remove the who parts carefully so as not to lift the pads that the cap was sitting on or pull up a trace connected to said pads.
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