[SOLVED]IMAC 820-2494-A , This board don't turn ON!

Noguinfor

New member
Hey guys,

This board don't turn on, only green light on the LED 1. I try to turn on by a short pad and no lucky .. Any some tips for this cancer issue ?

thank you
 

2informaticos

Administrator
Staff member
Check Power Sequencing Block Diagram and post some voltage values there.
Don't forget to check L7920 voltage...
 

Noguinfor

New member
PP1V1_S5_REG - 1.113V

PP3V3_S5_REG - 3.373V

PP5V_S5_LDO - 4.985V

PP12V_S5 - 12.05V

ALL S5 voltages ok! This is no first time i have this issue in imacs. usually this machines leave without a solution!! because i say this issue is a cancer! ty for reply!
 

Noguinfor

New member
No shorts in rails.. And i call to costumer and he say the machine turn off and never turn on... You have any more idea ?? thank you
 

Noguinfor

New member
SMC_ONOFF_L - 3.35V

PM_PWRBTN_L - 3.35 and when i toggling goes to 0.18V and don't turn on.. I think it must be a little problem..
 
Hi, please share how you fixed the problem, I have two board with exactly same issue, only first led is on, there isn't any visible damage under microscope
 

MaxFix

Member
+1
Same model, same symptoms.
Checked all the rails and got the same values as OP.
Did you manage to fix it or threw it away?
 
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