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yes now i have image but still no backlight. i got two of these boards on my desk with same issue - hopefully when i solve one it will also fix the other. 12.6v on pin 1 on j9000.
"12.6v on pin 1 on j9000."
So you have LCD_BKLT_EN and of course BKLT_EN too.
Do you get LVDS_BKL_PWM_RC?
If not, do PRAM reset few times.
If still no result, remove R9704 and run a wire from LVDS_BKL_PWM_RC to BKLT_EN.
If works, do PRAM reset again.
Resolder all components (remove the previous wire),test and comment...