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I checked it again and nothing can be found. I removed wire and put back R7747 and now again not blinking. al caps: C7724/25/23/26/27/20 has been changed. L7720 and D7720 also changed today (before your message)

I found donor with U7701 Rev 03 version. Put it. Now when it boot while bing keyboard light flashing once. but after that it doesnt turn on again,

Checked sensor and display brightness going up and down when flash with light near camera, so it is working.

WIll try tomorrow, anyway i tried with other display and was same result. Tomorrow will post about ALS, thanks

Just reflow SMC and now it is working. but anyway R5495 has 0.5V on pin 1 and 3V on pin 2 but fan not running high speed like before.

What is ALS? swapped from 820-4924 (04 version) and backlight on display is back, but still no on keyboard. Its nightmare this board.

I dont have LP8548B1SQ_-03 but jave LP8548B1SQ_-04 put it and lcd backlight is gone now, keyboard backlight still not working. DO you know if 03 and 04 are compatible?

ALl measerment were done when board was on. If board is off: 1- 6 are 0V 7 - 1..05V 8- 0.5V There is continuity from U5440 Pin 7 to R5495 and R5495 is 4.5 Kohms

Run wire and now there is 3.3 V but still no baclight. Also tried with new backlight sheet that 100% is working

R5495 4.5 Kohms U5440: 1 - 0,8V 2 - 1.5V 3 - 1.5V 5 6 - 1.05 7 - 0.6V 8 - 3.3V Must change U5440 ? I see that entering voltage is ok but outgoing is low, right? Must be about 1.05 on Pin 1 and 7

so you told me run wire between C7742/47 not ground pads?

You mean between Pad 2 of C7742 and Pad2 C7747 or create continuity between pad 1 and 2 of each component??

Near u5440 all is ok. R7660 you mean continuity on same resistor? If so there is continuity there is 1.05V on both sides. SMC_CPU_FSB_ISENSE 3.3V

Got this board. No water damage. Right fan is always high. When start it has some delay and after 2-3 seconds start run very high. Already changed U5570 and Q5501. Same result. Run AHT and it it gives me 3 errors: Fan-Right side (test1) Qiuck motor test-> Error - MOtor is spinning slower...

its 32 Kohm, i put O near 32. Done PRAM no result, Also done SMC RESET and NVRAM Reset. Same result.

Ok. D7720 not shorted between pins. Yes, Only miss keyboard backlight. LCD is ok. R7741 is ok (32O Khms) R7724/23 are 0.5 instead of 10 Ohms. But i measered on other board and it is also 0.3-0.5 so i think it is ok? R7747 - 0.2 Ohms C7747 has 0.8V

Q7701: Pin 5 12V Pin 4 - 2,7V Pin 1-3 - 0V It is BKL_SW . Is that normal? Must change q7701? Also checked XW7720 and there is continuity

Yes. 5V on both ends. And no short there

Got new keyboard backlight sheet. Still not working. Checked backlight sheet on other machine and it works. What else i can check?

D7720 get 5V on both points.