Cannot find any liquid damage, it chimes, caps lock working, nothing on screen (not even blink of image), nothing on external with known good SSD. Just once I've seen a short blink of white screen (with backlight) during chime - that's why I did not trash this board yet.
When it came to me, LVDS (J9000) was a little bit damaged around LED RETURN pins - some of them were most likely shorted. Some screws were missing, but otherwise the board looks clean, no oxidation, no signs of previous repair attempts, no flux anywhere before I touched it. I tried different LCD assembly, no success.
PPBUS_G3H 12.54V
PP3V42_G3H 3.42V
PP1V2_S0 1.2V
PP1V05_S0GPU 1.04V
PP1V8_S0GPU 1.79V
PP3V3_S0GPU 3.32V
PPVCORE_GPU 0.90V
LCD_PWR_EN 0.00V (not shorted to GND, but not even pulsing after power on)
SMC_LID 3.1V
GPU_RESET_R_L 0.00V
EG_RESET_L 0.00V
These two should be high I think?
All measured with genuine 85W MagSafe, only powerboard and LCD connected.
So far I reballed U9600, reflowed U8900 and changed J9000, but it's still the same.
When it came to me, LVDS (J9000) was a little bit damaged around LED RETURN pins - some of them were most likely shorted. Some screws were missing, but otherwise the board looks clean, no oxidation, no signs of previous repair attempts, no flux anywhere before I touched it. I tried different LCD assembly, no success.
PPBUS_G3H 12.54V
PP3V42_G3H 3.42V
PP1V2_S0 1.2V
PP1V05_S0GPU 1.04V
PP1V8_S0GPU 1.79V
PP3V3_S0GPU 3.32V
PPVCORE_GPU 0.90V
LCD_PWR_EN 0.00V (not shorted to GND, but not even pulsing after power on)
SMC_LID 3.1V
GPU_RESET_R_L 0.00V
EG_RESET_L 0.00V
These two should be high I think?
All measured with genuine 85W MagSafe, only powerboard and LCD connected.
So far I reballed U9600, reflowed U8900 and changed J9000, but it's still the same.
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