iMac A1311 820-2784 don't turn on

[buritix]

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]

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]

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