A2289 820-01987-06 Liquid damaged

[Lsol]

Hello,


Please help to find a problem. Corrosion was under U3200 and U6903, after reball got 20v 0.00-0.007A.

PP3V3_G3H- 3.3V,
PP5V_G3S- pulsing 4.5v-5.1v (diode mode-0.420)


L7270: 13.1 Ω,
L7210: 3.6 Ω,
L7220: 3.6 Ω,
L7410: 3.2 Ω
L7420: 3.2 Ω,
L7702: 49.4 Ω,
L8102: 56 Ω,
L8100: 0.490 kΩ,
L7030: 2.7 MΩ,
L8410: 1.11 MΩ,

 

[2informaticos]

First of all, welcome to the forum!

PPBUS_G3H exact voltage?
It is stable, or pulsing too?
Also check 3V3_S5.

 

[Lsol]

PPBUS_G3H - pulsinng 12.3-12.6v
3v3_s5- 0.003v

 

[Lsol]

looks like I found a problem-T2 'sandwich' has to be reballed as I can see corrosion under the top T2 chip