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Kyle93

Active member
Arrived with minor liquid damage. Fan spins and dvd drives activates but no chime and hard drive led light stays solid.

Liquid damage was on U7400, R4650, and pin 6 of Q7520

Replaced U7400 R4650 Q7520 Q7510 and Q7550. All traces on U7400 are good along with R7403 and R7402

CPU vcore 0.965v

Should something else be checked or sound like a dead CPU?
 

2informaticos

Administrator
Staff member
Do you get voltage on the other coils (RAM, PCH)?
Does it beep without any RAM module inserted?
Test with known good RAM module in each slot.
Check RAM slots with DDR3 test card.

VCORE should drop to 0.75V aprox in few seconds, when board boots.
Inspect SPI traces and resistors.
Try known good working BIOS...
 

Kyle93

Active member
Yes no video on external video.

no Apple logo on main display. Just lines. See picture. Also will not chime if battery is plugged in.
 

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Kyle93

Active member
Yes nothing loads. Just lines on the screen. External does not work. either Dead CPU or PCH? U4700 had liquid damage
 
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