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Yes, worked like a charm. Thanks for your help! I wonder why it failed first time when I threw a jumper to the other side of the board. In theory it should have worked, its the same line?

Hi informaticos. Sorry i didnt understand your idea first and i couldnt find the right video among 20 other backlight repairs videos on Louis channel. It is actually super simple. I will try your solution next week when new led driver arrives!

No Title Thanks for your advice guys. Test point is completely gone so i've decided to run a wire from diode to A5 (see pictures). switched it on and it burned my led driver which I replaced first thing before fixing fb line because I thought it was the problem originally. It was my last led...

Hello all, Water Damaged. Cleaned. 8.5V FB pad is gone (see the picture) and I suppose that is the problem. Question is how do I throw a jumper? From D7701 pin 2 to pin 5 on U7701? XW7720 is not on the board. Thanks, Max

Did I test it with a new cable - of course I did! Was it a good one? Hmmm probably not since after testing it with a third cable everything works now. Hahaha joke is on me. Thanks for your help. I go shame in the corner now :)

Hi there, Could you please help with solving no trackpad or keyboard problem on this motherboard. Power button works because mac responds to ON/OFF and SMC reset but cant type or use trackpad. PP3V42_G3H is present on J4813. R4823 and R4823 are good 2k. Also these two lines are okay. Please...

Thanks for your reply Duke. Case closed.

Hi guys, I have this beautiful machine in for repair - Mac Pro from 2009 Quad Core version. No image, no chime, no caps led but I do get all diagnostics led ON: CPU A CPU B 5V 3V EFI GPU Tested video card on another machine and it works. Any idea why I am not getting an image? Thanks, Max

And you are absolutely right! After U7300 replacement everything is working again! Another star to Duke! Thanks.

I am afraid thats exactly what happened because to my knowledge and customer claims nothing was previously done to bios. Will draw conclusions and make sure that doesnt happen again. Please close this threat.

Yes it boots to EFI ASD and all tests passed. However it gets stuck booting to OS ASD. Here is new piece of information. My colleague actually replaced U8900 from a similar board because after resoldering the old one was no image. Could that be of a problem?

Hi, Got this board in for water damage repair. Classical story. Customer had some wine, felt lonely, decided to share a drink with her macbook. Wine on the keyboard. Took the motherboard out, no signs of water damage inside. Try to boot but no sign of life. Question: With battery disconnected...

Hi there, This board came in with no image on internal and external monitor. Resoldered U8900. Got an image but it get stuck on booting OS. Looks like when it tries to load Graphic card drivers. Please advice how to proceed. pin 1 and 38 on U8900 are 3V. Thanks!

Yes 5VREG_EN on pin 1 of U7300 is present and showing 3.35V is that normal?

+1 Same model, same symptoms. Checked all the rails and got the same values as OP. Did you manage to fix it or threw it away?

Hi, Got this board in for GPU replacement. Basic video card failure symptoms. Was getting stuck loading video card drivers. Reflowed the chip to diagnose the problem. Confirmed. Also experienced some side problems: sometimes machine would not recognise my external boot drive on first try and...

No pulse on LCD_PWR_EN. Tried with a new working LCD.

Holy macaroni it worked! Checked that bastard under microscope and it looked nice and shiny with no damage. Resoldered it and it works like a charm now. Tested with full ASD test and 2 hours on donut test (Furmark). Unbelievable....

Hi, I have another 820-3332 board in for repair. According to the customer, this one started slowly dying out on him about a year ago. Every 15 minutes or so image disappears and sometimes the machine will restart and give a GPU panic error. Sometimes there is no image on boot at all. No image...

Pulsates from 0 to 0.27V then to 0V and 0.27V a few times on boot. Inspected DP lines everything looks in order. Did an ultrasonic clean, same.