Hello All,
I thought I should put this in a new thread.
The issue:
The laptop has no signs of life if AC or battery is connected, apart from a quick flick of light from LED5606 (sometimes).
No 3.3v & 5v power rails, I tested this at the power button connector, (J6201)
I found that the 3.3v rail (J6201 pin1) has a resistance of 1.5ohms to GND first red flag.
I investigated further and found that PU9100 and PU8100 get very warm if not hot once power is connected. (maybe one of them is at fault or under extreme load)
If I back feed the 3.3v rail with 1-2volts the only IC which then gets warm is U3001, I suspect a short in the IC, can anyone confirm my suspicions or am I barking up the wrong tree?
Any help will be greatly appreciated
Many thanks
I thought I should put this in a new thread.
The issue:
The laptop has no signs of life if AC or battery is connected, apart from a quick flick of light from LED5606 (sometimes).
No 3.3v & 5v power rails, I tested this at the power button connector, (J6201)
I found that the 3.3v rail (J6201 pin1) has a resistance of 1.5ohms to GND first red flag.
I investigated further and found that PU9100 and PU8100 get very warm if not hot once power is connected. (maybe one of them is at fault or under extreme load)
If I back feed the 3.3v rail with 1-2volts the only IC which then gets warm is U3001, I suspect a short in the IC, can anyone confirm my suspicions or am I barking up the wrong tree?
Any help will be greatly appreciated
Many thanks
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