820 3437 then spin , then stop .

funtotos

New member
Hi all

I've got a 820-3437. When I connect the magsafe the fan spins then stops, then spins then stops but no start.
green light on charger :

pp5v_s5 ok
PP3V3_S5 ok
PPVRTC_G3H ok

no P5VS4RS3_EN
no PM_SLP_S5_L
no SMC_S4_WAKESRC_EN
no S4_PWR_EN
no PM_SLP_S4_L

no short

any ideas ?
 
Last edited:

2informaticos

Administrator
Staff member
Toooooooooooooo many "no" there.
Imposible, if the fan spins...
So check if all coils get pulse at least.
ALL_SYS_PWRGD pulse too?

Catch the voltages when the fan spins, of course.
 
Last edited:

funtotos

New member
u1950 pin 7 and 3 = 3.43v (fan spin)

When i connect the magsafe the first time , no boot (green light and orange )
When i connect the second time , the fan turns then stop (green light and orange )
 

2informaticos

Administrator
Staff member
Check if all voltages from page 58 appear.
Yopu should get CPU voltage too.

Start removing SSD, this can generate strange issues if bad...
Also start without flex connected between MLB and LIO board.
 
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