3437 no orange light

[wirelessplanet]

820-3437 came in with liquid damage. pp3v42 was short and u7090 was corded. swapped it out and got orange light along with fan spin. thew it in the ultrasonic and now don't have orange light again. i tried changing u7100 but still no orange light. i checked diode mode on u7100 and no beeps.

u7100 voltages:
1- 0v
2-16.4v
3-4.375
9-.034v
12-3.4v
13-.09v
14-3.387v
15-.056v
17-8.18v
19-5.038v
20-5.038v
27-16.2v

resistance
17/18 - 3.5ohm
27/28 - 26ohm

 

[2informaticos]

Did you try another LIO flex/board?
Inspect J9500 pins for corrosion.
Check continuity for 3V42_G3H, SYS_ONEWIRE and SMC_BC_ACOK, between MLB and LIO board.

 

[wirelessplanet]

tried with new flex and board,
no corrosion on j9500 pins
pp3v42 - i have 3.417v
i tested continuity from j9500 to smc testpoint for sysonewire
smcbc acok -

 

[wirelessplanet]

found the issue. smc_reset_l was giving me issues. r5100 was half solder on the board, retinned the pad and replaced the resistor and all is working now.