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1. Ok, thanks. Should it be diode mode? Resistance mode correct? No worries. I found it on ifixit how to do it https://www.ifixit.com/Guide/How+To+...r/25632#s65006 2. reflow U7701 and LED driver.. How much temperature? Ok. So now ive check the resistors: R7731 & R7715 R7731 Shows 120k...

Measure the resistors.. Do i need to take them off the board first? Because ive now measured them whilst on the board with voltage..

NO apple logo at all.. The screen is black.. Im following some examples now from step by step: REWA https://www.youtube.com/watch?v=-7_paJiwMO8 Will reply shortly after my finds. I have: PPVIN_S0SW_LCDBKLT - R7731: pin1: 5.1v - pin2: 0.6v (Should be: Pin1: 8.5v, Pin2: 2.8v) According to REWA...

1. No apple logo when adding light to the screen. The screen is pitch black still. 2. I get chime when pushing start button. And the apple logo on the back of the LCD is lit. But not front. 3. L7701 (I have 8,5 Voltage). On Diode mode I have 0.384. 4. C7710 (resistance mode I get 0.428) and...

2 sec im gonna chekc now

No backlight on LCD - 820-3437 Macbook Air.. Its been water damaged. Where to start. The motherboard starts. I have green light and fan spin. The apple logo on LCD cannot be seen. The screen is black.' Where to start now?

Thanks Duke.. U where the right.. It was the heat cable for LCD screen that was missing. I didnt see it or think of it when i changed the screen.. It was the smaller cable.. Now everything is working perfect.. :) Thanks guys, best support forum there is anywhere in the world from what I know...

Ok, thanks Duke.. This goes to spareparts section..

No Title I tried boot from good USB osx.. And i got this.. I guess the GPU is gone for ever? The motherboard gets warm really fast and starts smelling burned close up..

Ok cool.. thank you.. Will tell my client that..

I Hold "D" button for sometime right after chime. but only white screen shows up.. and nothing else. The fan still going HIGH.. What now?

I changed the temp sensor cable, from the old one to the new lCD screen.. The FAN still running high.. What now?

So do u suggets the customer buy a new motherboard?

Will send u a email now with information.

Excellent presentation and insight--- thanks Louis..

How much temperature do u suggest i reflow the GPU on? and should i use high airflow or slow airflow?

Cool. thanks TCRScircuit.. I wont charge the customer.. Agree with you. Im always upfront with the customers about the issues at hand. Serves the business best in the long run.. :)

I changed the screen on my customers iMac retina 27". And now after the swap, the fans start to goes super high. Does anyone know why or what the problem could be? 1. i have tried resetting PRAM. NVRAM. Still same problem. thanks for your feedback. Attached is an image.

Thanks you... i thought so as well.. Not much to do then..

Youre right..