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You are correct sir my apologies for confusing the situation. I can usually see the image with my nake eye but this time I had to use a flash light to see the blinking folder but it is there. So to figure out why I have no back light.

Decided to take keep messing with this board. I took some measurements regarding the GPU power, I also tried pushing on the MUX while powering it on. PP1v05_S0GPU = 1.05v PP1V8R1V55_S0GPU_ISNS = 1.33v PP1V8R1V55_S0GPU_ISNS_R = 1.33v PP1V8_GPUIFPX = 1.78v PP3V3_S0GPU = 3.28v PPVCORE_GPU = 0.9v...

The board looks un-sodomized no signs of previous work. I have not done anything to it besides what we have discussed. Out of probably over 100 power cycles since I have been testing it I have maybe gotten video 5 times. Ill let you know on the MUX/GPU stuff. Thanks Duke!

Heated the gpu up to 100c, tried again issue remains. An observation I made when I had the board out is that after the chime the fans rev up to full speed and remain there they do not throttle down. This was happening before and after heating the board. Dont know if that mean anything to this...

External video does not work, SMC_LID Probe R5071 3.3v w/ screen PIN 4 = 3.2v PIN 6 = 3.2v PIN 7 = 3.2v Diode Mode PIN 4 = 0.27 PIN 6 = 0.45 PIN 7 = 0.46 W/o Screen PIN 4 = 3.3v PIN 6 = 3.2v PIN 7 = 3.2v Diode Mode PIN 4 = 0.27 PIN 6 = 0.45 PIN 7 = 0.45

I replaced c9560, and also just got my known good screen, still same issue not able to get image or backlight. I get chime every time.

I understand that, im more convinced now that the connector is causing a problem. Which is also causing incorrect measurements. Thanks guys ill let you know the measurements after replacing the connector with the correct one.

Okay, I should have correct connector tomorrow or Tuesday, Ill swap it out, But I undoubtedly have "ghost image" on screen I can see the apple when it posts. Its not just my subconscious putting it there :D

Q9707 pin2 = 3.3v pin5= 0.0v

This is where my inexperience comes in. Understand the function of what you are talking about just not sure how to apply what you have asked me to do. How do I check the gate signals of Q9707 I measured R9788 and R9788 R9788 - pin1 = 12.5v, pin2 = 12.1v R9789 - pin1 = 12.1v, pin2 = 12.0v

Im using this connector because its all I have at the moment the other connectors are on order. This is not a permanent solution. Can I be causing additional damage using this connector? Youll have to excuse some of my inexperience im still pretty new to logic board repair. I measured...

Those pins measure 0.0v I took the measurment on the pins them selves and also on c9796 and c9020 0.0v

Yes If I hold the screen at the correct angle I can see an image on the screen, pin1 - 0 pin2 - 0 pin3 - 0 pin4 - 3.2v pin5 - Sync .14v pin6 - 3.2v pin7- 3.2v I did change c9015 and l9004 after I took these measurements and found out that im missing 3.2v on pin 2 and pin 3. Still same...

I got a board in that had liquid damage on the lvds connector. it was pretty bad. I pulled the connector off, cleaned the area really well. Soldered a new connector on, As a persecution I also changed the back light fuse. PINS 21 and 22 for the lvds connector have the solder pads missing. I...

larossmann any tips regarding this.

I just got my new microscope today and got it all setup. It looks amazing, I do have a question tho. To focus a board on my bench the microscope head has to be about 4.5" off the desk. My old AmScope SE400-Z I had almost 9" of work space under the microscope. Is there an adjustment or something...

I got this board today, I was a able to get video out of it once out of probably 15 power cycles. It does chime every power cycle. I ran out of time today at work to start measuring power rails. Am I correct in thinking this is a 330uf tantalum cap problem (c9560)? Or at least a good starting point?

I have a machine that was left at my shop for scrap. The video is corrupted, I tried new ram sticks did not help. I know this machine isn't worth anything but this is more a learn exercise for me. It appears to me that I either have a bad gpu or bad vram. Not sure what the diagnostic steps are...

The voltage was 0.3v, I changed that cap measuring 1.1v fixed the issue. Thanks Duke. I just watched one of the videos from Louis last night that he did this is exact same process. Very helpful stuff.

Im still pretty new to board level repair, I have watched around 20+ hours of Louis's videos. So im catching on. But I still have a lot to learn. I do have a schematic and board view for this logic board. -Looked over the board really well for liquid damage none was found. -Tried a new...