[SOLVED]820-3115 No Backlight

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820Slave

Member
No Backlight
Flashing Folder
U9701 Changed

21+22 of J9000 PPVOUT_SW_LCDBKLT starts @ ~20v and falls to steady 12.54v in just about the same time flashing folder appears RTG at this point .567v
0.0v BLK_PWM
3.29v on pin 5 of q9707 LCD_BKLT_EN

Any assistance would be appreciated. Thank you.
 

820Slave

Member
I would have been quite embarrassed if it was indeed that simple after replacing U9701 with the same outcome, however PRAM reset didn't help. Still no Backlight.

Thank you very much for your assistance. It's great to have a resource such as yourself as these challenges can make you a tad MENTAL.
 

dukefawks

Administrator
Remove R9704 and connect pin 2 directly to 3V_S0. This should get the backlight working, just no adjustment possible.
 

jadao

Member
I would tell you to check if smc_lid is high just in case the board thinks the lid is closed.
But not sure if it's an smc_lid issue since you have 20v at bklt output remaining few seconds...
 

820Slave

Member
Duke, board was missing r5071 and bad c4906. Against my hunches I changed U9701 for nothing, thank you for teaching me the order of operations. Very grateful for your assistance.
 
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