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a1279 820-2610
- Thread starter tili1988
- Start date
Vogelek23
Member
This voltage comes from U7500 controller, =PP5V_S0_REG voltage rails (L7510 inductor). Check LDO output (pin 7) , EN1 enable input (pin 14), VBST1 voltage (pin 17) and VIN (pin 6). Do you have any voltage to ground on =PPMCPCORE_S0_REG (L7560 inductor) at the same time? What is the resistance to ground on L7510?
Please, use a better translator.
I don't exactly understand your first post.
I recommend you to start changing C7771.
You can find lot of information about its failure on Internet and this forum.
When the machine turns on, do you get video, or USB activity?
If fans spin to max then, which other voltages (apart of 5V_S0) do you get on the board?
Check all big coils at that time.
Remove charger and allow 15s to discharge any remanent voltage.
Then check the resistance to ground at L6995.
Use ohm scale, not diode mode; should be higher than 30K.
I don't exactly understand your first post.
I recommend you to start changing C7771.
You can find lot of information about its failure on Internet and this forum.
When the machine turns on, do you get video, or USB activity?
If fans spin to max then, which other voltages (apart of 5V_S0) do you get on the board?
Check all big coils at that time.
Remove charger and allow 15s to discharge any remanent voltage.
Then check the resistance to ground at L6995.
Use ohm scale, not diode mode; should be higher than 30K.