Hi guys
Initially the 5 volt rail resistance was 3 ohm, injecting with 5 volt found the short was caused by alc audio codec ic, after removing it the resistance now is around 30ohm. But injecting with 5 volt draws 0.6 amp, so there is some kind of active short somewhere ? ( 5v/0.6A > 8ohm)
Also 3.3v alw is generated by tps51285a ic. On the 3.3 ldo side with DMM, measurement is 21kohm. The ic itself turns on off rapidly when powered indicating over current with audible high pitch whine.
when 3.3v is injected to 3.3v ldo rail, it draws up to 1 amp which caused ite superio ic
(it5125vg) to get hot, luckily 51285a itself is fine.
Is it downright the ite chip being faulty or something connected to ite might be shorted which in turn draw excessive current from EC chip ? New chip is on the way
Here is photo, test pads circled in yellow give reading about 6ohm
Another topic but on the same line what could have caused this multiple short ics ? Is it electric shock static or something like thunder ? Is there any hope to this board ?
Thanks guys
Initially the 5 volt rail resistance was 3 ohm, injecting with 5 volt found the short was caused by alc audio codec ic, after removing it the resistance now is around 30ohm. But injecting with 5 volt draws 0.6 amp, so there is some kind of active short somewhere ? ( 5v/0.6A > 8ohm)
Also 3.3v alw is generated by tps51285a ic. On the 3.3 ldo side with DMM, measurement is 21kohm. The ic itself turns on off rapidly when powered indicating over current with audible high pitch whine.
when 3.3v is injected to 3.3v ldo rail, it draws up to 1 amp which caused ite superio ic
(it5125vg) to get hot, luckily 51285a itself is fine.
Is it downright the ite chip being faulty or something connected to ite might be shorted which in turn draw excessive current from EC chip ? New chip is on the way
Here is photo, test pads circled in yellow give reading about 6ohm
Another topic but on the same line what could have caused this multiple short ics ? Is it electric shock static or something like thunder ? Is there any hope to this board ?
Thanks guys
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