820-3476-a led green on/off/on/off

[lincev]

hello guys, another board..

It doesn't turn on, it doesn't fan, etc. It only shows a green LED and turns off, a few seconds later it turns on a green LED again and turns off.

Checking the board, it had corrosion on IC U3220 and U5110, I have cleaned the area but have not desoldered. I have also checked the U7100 but everything seems correct. But it still doesn't work, what is your opinion? any ideas? thank so much !

 

[2informaticos]

Remove U5110 and check its pads.

 

[lincev]

omg! i remove but surprise I don't have points

PP3V43_G3H, SMC_MANUAL, SMC_RESET, SMC_TPAD, SMC_ONOFF, PP3V3_S5


Is it possible to patiently remove threads from those points?

 

[2informaticos]

I'm not sure what you mean.
The board pads (under U5110) are not there?

In such case, need to run tiny wires under the chip, in place of old pads.
0.03mm is what I use for this kind of jobs.

 

[lincev]

It's my first time I'm going to try it

 

[lincev]

I have already repaired the IC U5110, now I have removed the IC3220 and pin2 DP_TBTPA and pin3 PP3V3_S4 are also missing track, is it necessary to repair to have a green light?

 

[2informaticos]

NO, forget the TBT area; unless you have some short there.

Post exact PPBUS_G3H and 3V42_G3H voltage.
Also check SMC_RESET_L; should be high.

 

[lincev]

PPBUS_G3H= 0,11v (1second 10v apron countdown....)
PP3V42_G3H= 0v (1second 3,4v and countdown to 0v)

SMC_RESET_L=0,10v

TBT no short

 

[2informaticos]

You have more areas affected by corrosion.

3V42_G3H is the first voltage required on the board.
Apart of original charger, test the board with fake charger, or lab PSU.
You may have leakage issue.