bighead
New member
Hi guys,
I've a 820-2879 here with a power problem.
This one is not liquid damaged. Lot of dust in the computer, but no liquid damage.
The problem is that it turns on sometimes and it works ok, but lot of times it won't turn on.
Some measurements:
When it's not turning on:
PPBUS_G3H - 12.55V but goes down and up.
PP3V3_S5 - jumping between 3.3V - 1V
Sometimes everything goes down to 0V and stays there until I disconnect and reconnect the charger.
SMC crystal is oscillating.
I changed U7200 I thought I've a problem with the PP3V3_S5 line.
There is no short on PP3V3_S5 nor on PP5V_S3
Any idea?
Thank you!
I've a 820-2879 here with a power problem.
This one is not liquid damaged. Lot of dust in the computer, but no liquid damage.
The problem is that it turns on sometimes and it works ok, but lot of times it won't turn on.
Some measurements:
When it's not turning on:
PPBUS_G3H - 12.55V but goes down and up.
PP3V3_S5 - jumping between 3.3V - 1V
Sometimes everything goes down to 0V and stays there until I disconnect and reconnect the charger.
SMC crystal is oscillating.
I changed U7200 I thought I've a problem with the PP3V3_S5 line.
There is no short on PP3V3_S5 nor on PP5V_S3
Any idea?
Thank you!