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I have backlight! First tried with the jumper method and worked, then resoldered R7704 and now working perfectly. Pads underneath was perfect by looking at it, but scraping it showed a layer of oxidation. Thanks a lot guys!

R7704 looks good, perfectly soldered and has a value of 47ohm. BKL_PWM 0.815 EDP_BKLT_PWM 0.026 tried PRAM reset few times, nothing changes

Continuity from U7701 A5 ball and pin2 of D7701 fine! Sorry, i was really tired after a lot of non-stop work! Here are the voltages: 3 BKL_EN 2.8v 4 BKL_PWM 0v (voltages taken with magsafe, lcd connected) thanks!

U7701: 12 - BKL_FLTR 9.8k 3 - BKL_EN 75k 8 - BKL_ISET 16k 4 - BKL_PWM .47 19 - BKL_SDA 10.5k 9 - BKL_FSET .19 Yeah, after changing U7701 and surrounding components blacklight is always off now. You mean pin5 of U7701? If yes, under scope is perfectly soldered, and had no corrosion on pads when...

edit...wrong trhead...sorry.

Yes, connections on XW7220 are perfect! Voltages on D7701: 7.7v on both sides (Yes, i'm trying to use that threads too, thanks!)

Found slight water damage under U7701...so i've changed: U7701 R7715 R7731 R7714 R7704 C7704 R7716 C7711 Nothing changed, no backlight!...what can i check now?

Hi! i have this 820-00165 board that has no water damage, but suddenly the backlight started flickering. I?ve repaired a lot of not working backlights on these machine but never seen before a flickering one. Where do you suggest to start? thanks! :)

Hi! :) I have a 820-4924 board with water damage, mainly on the display connector (already replaced that). Board seems dead, what you suggest start checking? Thanks!

Hi! :) I have this 820-2530-A that works perfectly but only with adapter. Tried with 2 known good batteries. Battery is correctly recognised by the system and apps like coconut. Inspected the board and is very clean, no water damage at all and i can't see anything burned. Where you suggest to...

...and no way to fix it i presume...

Changed 2 gpu's (classic shitty old stock, hate that), so i will do a demux/tiresias

Hi! I know...this is an old board, but customer wants it fixed anyway. No water damage, i have no backlight and no video with flashlight behind the apple. Where you suggest to start?

External video ok, tried now with another lcd and have exact problems

I'll add that if i boot from room temperature it works fine until i stress-test it and temps get higher!

i'll do both (if necessary) and reply, thanks

I'll do that, thanks!

Damn, at the moment i don't have that exact model...(of LCD) Disconnected LCD and tried with external, the image is always perfect!

Nice! :) Can i test it somehow to be 100% sure?

Sure! It starts with perfect image, and then after 2/3 seconds: and then it gets worse: Then if i connect hdmi external display i can use both normally. I managed to install osx without problems, but day later started acting weird.