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don't know whats happen here but i took bigger fuse is normaly original on board and now is working :) i have 33.45v on backlight output now :) thx for help
ok. i removed and clean dcin connector and bridged pin 5 dcin to u6900 pin 5 and now i have green light on charger but when i connect 16.5v charger. when i connect 18.5v no green light :( very strange situation
hi guys. i have board 820-2850 with no backlight. voltage checked:
BKLT_EN : pin 4 3.12v (is that a problem?)
PP5V_S0: pin 23 4.95v
d9701: pin 1 12.61v pin 2 24v
not sure what i need to check more. still learning anybody can help. its emergency job !!! :)
i have board with was water damaged. replaced few components with was look bad but still no sign of life.:
PPBUS_G3H : 12.6v
PPDCIN_G3H :16.37v
PP3V42_G3H :3.41v
SMC_BC_ACOK_VCC: 3.42v
ADAPTER_SENSE: 3.42v
any idea why light is so dim and no power up ?
ok. i done jumper from pin 5 on magsafe connector to u6900 pin 5 and now motherboard is working :) thx for all guys . all of you give me little bit to think how is it work and now is powering up. Done!!!