iambehr
Member
Hello,
I have a touchbar mac that does not output to the internal display. I can get video output via USB C, and the logic board powers on and boots mac os.
The history is liquid damage, no obvious corrosion except between pins 1 and 43 of J8500. Cleaned up and replaced LCD cable, verified no connection, but the problem still persists.
I've been troubleshooting this one for a while but have come up pretty much empty handed.
Originally I thought there was a good chance that U9850 was dead (the short might have sent backlight voltage to the chip), so I did some research and found a replacement for the CBTL06142EEE (I could not find it available for order) with a HD3SS212ZQET, which should be compatible. The system sill powers on but it still has no display.
I get LCD_MUX_EN ad 3.3V.
EDP_PANEL_PWR_EN appears at 3.4 volts and disappears a second after power on. Same for DFR_DISP_PWR_EN, DFR_DISP_SMC_RST_L, BUF_EDP_PANEL_PWR_EN, and PANEL_FET_EN_DLY .
PPVOUT_S0_LCDBKLT is .01 volts (almost nothing)
PANEL_P5V_EN_D is 0 volts.
Can anyone with a little more experience with the newer macs assist in troubleshooting? I'd really appreciate it.
Thanks,
Stefan
I have a touchbar mac that does not output to the internal display. I can get video output via USB C, and the logic board powers on and boots mac os.
The history is liquid damage, no obvious corrosion except between pins 1 and 43 of J8500. Cleaned up and replaced LCD cable, verified no connection, but the problem still persists.
I've been troubleshooting this one for a while but have come up pretty much empty handed.
Originally I thought there was a good chance that U9850 was dead (the short might have sent backlight voltage to the chip), so I did some research and found a replacement for the CBTL06142EEE (I could not find it available for order) with a HD3SS212ZQET, which should be compatible. The system sill powers on but it still has no display.
I get LCD_MUX_EN ad 3.3V.
EDP_PANEL_PWR_EN appears at 3.4 volts and disappears a second after power on. Same for DFR_DISP_PWR_EN, DFR_DISP_SMC_RST_L, BUF_EDP_PANEL_PWR_EN, and PANEL_FET_EN_DLY .
PPVOUT_S0_LCDBKLT is .01 volts (almost nothing)
PANEL_P5V_EN_D is 0 volts.
Can anyone with a little more experience with the newer macs assist in troubleshooting? I'd really appreciate it.
Thanks,
Stefan