[help] 820-00928 stuck at 5v rebooting!

[phantom]

Hi to all ! I have to fix this 820-00928! I have a lot of corrosion like you can see in the picture

I have reballed the controller, replaced 3 resistor and in the video you can see the behaviour…all ports at 5v 3 ports rebooting, one port (the on corresponding to the controller that I’ve reballed) not rebooting. Could you Help me? Thanks

VIDEO

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PICTURE

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[phantom]

All ldo are presents

ppbus 0v (no short)
pp3v3 present

 

[2informaticos]

Post U7000's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, SMC_RST*, AUX_OK, A/BMON.

 

[phantom]

Ppdc_IN,5,24
AUX_DET 1,3
SMC_RST_IN 0v
VDDA 5V
VDDP 5V
SMC_RST 3,4
AUX_OK 3,4
A/BMON. 0V

 

[2informaticos]

Remove F7000/1 and check C7050 voltage.

 

[phantom]

0v

 

[2informaticos]

So your problem is on U7000 area.
Check R/C/Q7030/40 and their traces.
Also check resistance (ohm scale) over C7020/3.
If all good, replace U7000.