00239-A 20v 0.36a No Display (LR364)

[briancomputerdoctor]

Came in with no display. Retrieved data through target disk mode. Extracted mobo with no visible signs of damage. Connected to monitor through usb, screen backlight comes on but nothing displayed (no apple logo).

L7210 0.725v
PP5V_S0 5.14v 0.426
PANEL_P5V_EN 0v 0.515
PPBUS_G3H 13v 0.410
PP3V3_G3H 3.4V 0.325
PPVCCGT_CPU_PH3 0v
PPVCC_CPU_PH1 0v
PP1V8_S0 1.79v 0.308
PM_SLP_S3_L 3.35v 0.408
PP3V3_S0 3.34v 0.283

 

[2informaticos]

Check diode mode to ground on EDP_INT lines of J8500.

 

[briancomputerdoctor]

EDP_INT_AUX_N 0.27v 0.207
EDP_INT_AUX_P 0.27v 0.207
DP_INT_HPD 0.05v 0.472
EDP_INT_ML_N<0> 0.15v 0.210
EDP_INT_ML_P<0> 0.15v 0.213
EDP_INT_ML_N<1> 0.15v 0.214
EDP_INT_ML_P<1> 0.15v 0.209
EDP_INT_ML_N<2> 0v 0.217
EDP_INT_ML_P<2> 0v 0.211
EDP_INT_ML_N<3> 0.15v 0.213
EDP_INT_ML_P<3> 0.15v 0.209

 

[2informaticos]

I don't see big differences.
Just in case, compare with known good similar board.

CPU remains as first suspect here; bad iGPU.