iMac A1311 820-2784 don't turn on

buritix

New member
Hi everyone , here an iMac don't power on only one led on , no chime , no spin, no light on mouse

PP3V42_G3H 3.43
PP12V_G3H. 12.09


PP3V3_S5. 3.31
PP5V_S5 4.99
PP12V_S5 12

PP1V5_S3 1.5
PP3V3_S3 3.3
P5V_S3 5.10

PP12V_S0 12.8
PP0V75_S0 0.75
PP1V05_SM_PCH_LAN 0
PP1V05_S0 1.06
PP5V_S0 5
PP3V3_S0 3.31
PP1V8_S0 1.8
PP1V5_S0 1.48
PP1V5_CPU_MEM 1.49
PPVTT_S0 1.11
PPVCORE_S0_CPU 1.12
PPVTT_S0_DDR 0.75

any idea ?

thanks , Any help would be appreciated!
 

2informaticos

Administrator
Staff member
I suppose you get light on LED601.
But LED605 MUST too, as you have 3V3_S3.
Please recheck...

ALL_SYS_PWRGD should also be present, with mentioned voltages.
So LED602 must be on too.
 

piernov

Moderator
Staff member
Graphics card can prevent POST. Check if it chimes without graphics card, try another (known good) one if possible.
 
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