LG Super Multi DVDRW GSA H10A Death

[KountZERO]

Had a bad Molex plug cause a spark on the Drive and since it hasnt been found in the bios. Drawer still opens and the r/w light flickers as normal when closed. Pulled the pcb out and could find no visible damage so looked at the 1st likely component on the 5v side, A voltage regulator APL1117WI19R. Ive desoldered it but need advice on testing it with a multimeter. To me it seems to be shorted but as ive only ever tested mosfets ie. priming input then testing output, in this package i could use some pointers please guys.

Thanks, kZ

[Th3_uN1Qu3]

Re: LG Super Multi DVDRW GSA H10A Death

If it reads zero ohms (or some low value, like under 20 ohms) then it's shorted.

[KountZERO]

Re: LG Super Multi DVDRW GSA H10A Death

Ah okie, its reading 13.74 mega ohms across the V in/V out. Its infinity ohms between V out and adju, that seems suspect to me?

[kc8adu]

Re: LG Super Multi DVDRW GSA H10A Death

you are not going to get normal fwd/rev readings like a transistor.look at the power connector area for open fuses and shorted tvs.if you can power the board in the open see if your reg is showing proper voltage at the output.

[KountZERO]

Re: LG Super Multi DVDRW GSA H10A Death

Cracked it! was one of those red herring faults that occur when your doing something else and you think what you were doing caused it.

I was so convinced it was the 5v power circuit because i was pushing the cables back to put side back on when the arcing happened. However it seems the drive not being found was due to a cold solder joint on the master/slave/cs jumpers. Only discovered it by accident having changed a dead smd cap and i was holding the drive while booting to test it [it worked] and found it wouldnt work again after putting it back in the bay.

Feel real stupid, sorry for wasting your time guys. Least i had a bit more smd soldering practice as a result.