820-3476-a not turning on.

BCN_Techs

Member
Hi,

Logic board was water damaged in U7501 area. Cleaned, replaced U7501 and R7537 C7537 C7536 that were burnt. Now seems that i am getting all reail ok but dont getting ALL SYS GOOD.


CHecked and seems that board tries to enter S0 state once connect adapter. PP3V3_S0 is 1.7V and PP5V_S0 0 V. As i see i will not get sys good while PP5V_S0 is not activated.


Bad U7501 ??? ALready replaced it twice.
 

2informaticos

Administrator
Staff member
There are other coils I was expected to know the voltage; like PCH and DDR (L7630, L7430)...

L7310/20 could be low ohm to ground as normal; compare with known good working board.
 

2informaticos

Administrator
Staff member
Do you get any pulse at L7520?
Trigger SMC_ONOFF_L and check that.
Check all other coils at same moment.

"Now seems that i am getting all reail ok"
How that?
You've said to get only 3V3_S5; didn't say anything about pulse (at least) on other coils...
 
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