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I cleaned my dell inspiron15 3576 motherboard using 70% isopropyl alcohol and after 1hour tried to switch it on and saw my caps lock light is continuosly on for a minute while no other response from the system. I tried everything replacing ram slots,removing each device from laptop,removing cmos battery,pressing powerbutton for 30s and when i plug my charger i noticed the battery is not showing charging light, plus always the same thing caps lock light is on for some time.
@nick@jayeff problem solved !! I called many technicians asking for them to do a home service. But they couldn’t come plus they all came to a conclusion that my ic or mother board is at fault and need a checkup. But i refused to belive it since there was no burn or any kind of incidents related to it. So i used a hair dryer and cleaned each and every neck of the mother board. and wola!! He came like a genie. Thanks for your response and giving some suggestions
Dell has been building machines that are more picky about RAM since Haswell with DDR3L, so you need to stick to using quality RAM in anything newer than Ivy Bridge if you aren’t working with original modules (usually Samsung if factory installed). I usually recommend Crucial (Micron) or Kington in the Dells for aftermarket, as it seems to be accepted the best. They aren’t as picky as HP (will reject with a POST error if the timing is inconsistent on Elite and Z), but Dell has clamped down on the tolerances with the newer computers since you can’t get away with as much when the tolerances got as tight as they are on the voltages (1.3V for DDR3L, down to 1.2V for DDR4). It sounds like you may have spilt something on the motherboard since you mentioned IPA - if you’ve already tried to repair it at the board level, then usually that means there’s serious damage somewhere that will not easily be repaired. Might be time for a new motherboard or laptop, since the boards can be quite expensive. Look at it this way, especially on the RAM tolerances Dell has pushed on: I miss the days when you can get whatever is cheap on eBay as long as it works with 1.5V DDR3, but they had to do it because the voltage tolerance between DDR3 and DDR3L was reduced by .2V; DDR4 bumps that to .3V, so it was unavoidable. You can’t get away with accepting anything that’s in the slot when you went from 1.5V down to 1.2V! Even then, it was better to use good RAM but if you got it cheap and were okay with the very real risk of a no POST, it usually worked.
