Re: DV9500 blue LED ring of death ?
Even I didn't see it at first. It's the point labeled "VAD-1" that connects both circuits. You can see it in small red text next to PD16.
Basically, the 2 transistors generate a square wave by turning on one at a time. But if one transistor goes bad and is stuck on, then it will cause a short circuit from 19V.. through PD16.. through one transistor.. through the other... and straight to ground.
It's possible just PQ62 went bad and only damaged itself and PD16. But it's a good idea to check all that stuff just in case. Don't want the new components to blow up too.
Even I didn't see it at first. It's the point labeled "VAD-1" that connects both circuits. You can see it in small red text next to PD16.
Basically, the 2 transistors generate a square wave by turning on one at a time. But if one transistor goes bad and is stuck on, then it will cause a short circuit from 19V.. through PD16.. through one transistor.. through the other... and straight to ground.
It's possible just PQ62 went bad and only damaged itself and PD16. But it's a good idea to check all that stuff just in case. Don't want the new components to blow up too.
Comment