820-4924 no boot, was working sporadically before

samiam

New member
customer brought in and said it needed a new keyboard, because it wouldn't turn on reliably which I did and tested it on and off fine 3 times before closing up. this was definitely in the top 3 of must disgusting keyboards, with all types of crap in there.

after he took it back it didn't turn on again, and he complained it was hot, even though it was off. i took a look and board was getting hot under ssd. I noticed a tiny bit of crap on edge of smc, also smc was warm so I tried cleaning a little with alcohol and blowing hot air and flux under

keyboard smc reset does change light color from orange to green
but still no boot or chime

after cleaning, spot under ssd is still warm but now farther to left, versus before opposite smc
now U8070 is actually hot to touch

does that make sense that it's holding up booting (even though there is no ssd actually present)
or is the smc fried

any easy way to tell?
 

dukefawks

Administrator
U8070 is on a 3V_S0 rail so something must be powering up for that to get hot. Check for short to GND on pins 3,5.
 

samiam

New member
i put on another chip and now all the lines are reading proper at 3.3V, not getting hot anymore. but still no boot. any ideas? maybe i should ultrasonic the whole thing? board didn't really get wet as far as I can tell, but there was just so much crap and debris in there who knows
 
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