Hi everyone, working on this 820-2849 board. Its been driving me mad for the long time and i cant figure it out so decided to ask you guys some help. its been a pain and i know that it might be a dead video but i believe i can still fix it. Right so the problem is that macbooks starts as it should, chimes ok, but theres no backlight or video.i have checked all power rails and all power rails are pretty much ok. GPU vcore and cpuvcore both present. i have noticed that PPVCORE_S0_CPU starts with 1.05v with fans spinning but after fans starts to spin faster voltage drops to 0.89v . is it normal or needs to be investigated? Also came accross that GFXIMVP_ISNS_IOUT=SMC_GFX_ISENSE only 0.01V. anyway any suggestions where to start? ppbus_S0_LCDBKLT_FUSED power stops at Q9806 pin4. 0V pin 1.2.5.6. LCD_BKLT_EN -0V.
L9000 - 0V both sides. LCD_PWR_EN 0.01V .Changed u9000 no change. really desperate for some help or where to start.
L9000 - 0V both sides. LCD_PWR_EN 0.01V .Changed u9000 no change. really desperate for some help or where to start.