Hello
I have a HP envy 13-D (LA-C482P) laptop. It has suffered liquid damage, when i received the board it was completely dead, no lights or any reaction. Since then i have changed the DC in/charging IC ISL95520 with a similar ISL95521 and replaced some damaged components and now the board will get a light on DC jack when adapter is plugged in, and i have 19v and current resistor PRB1.
When plugged in it consumes 0.07a, when the power button is pressed the fans spin for about half a second and then the board returns to the same state, just consuming 0.07a. What also is confusing is it seems the board thinks it is using battery power even tho there is no battery connected. There is 8V on PRB2. 8v can be found on the input capacitors for each power rail, where usually 19v should be if using an adapter.
Whilst the adapter is plugged in the 3.3VALW IC PU301 (RT7290A) is getting hot.
I have checked all coils for shorts and there is nothing obvious that i can see. I also removed jumper PJ302 to try and isolate the problem, but the IC still gets hot.
I have exhausted my knowledge and require some help from more skilled technicians. I can take readings if you need them, the schematics for this board are also available.
Thank You
I have a HP envy 13-D (LA-C482P) laptop. It has suffered liquid damage, when i received the board it was completely dead, no lights or any reaction. Since then i have changed the DC in/charging IC ISL95520 with a similar ISL95521 and replaced some damaged components and now the board will get a light on DC jack when adapter is plugged in, and i have 19v and current resistor PRB1.
When plugged in it consumes 0.07a, when the power button is pressed the fans spin for about half a second and then the board returns to the same state, just consuming 0.07a. What also is confusing is it seems the board thinks it is using battery power even tho there is no battery connected. There is 8V on PRB2. 8v can be found on the input capacitors for each power rail, where usually 19v should be if using an adapter.
Whilst the adapter is plugged in the 3.3VALW IC PU301 (RT7290A) is getting hot.
I have checked all coils for shorts and there is nothing obvious that i can see. I also removed jumper PJ302 to try and isolate the problem, but the IC still gets hot.
I have exhausted my knowledge and require some help from more skilled technicians. I can take readings if you need them, the schematics for this board are also available.
Thank You