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Whats the date code on the GPU you replaced ? Firstly, I would inspect the board for knocked off or missing components.

Why stock multiple fluxes when the Amtech stuff does the job ? Although i did try Amtech LF 4300 TF recently, but found it burned off a little faster.

I wait 6 months, then send them a recorded letter, stating the item will be disposed of from 14 days from when the letter posted. You cant be touched then, since you have done everything correctly on your side.

Well, i've been planning my exit for 2 years, so its no big shock to the system. Lots of AASP's will be fucked, as they totally rely on Apple referrals. There is no money left in being a part swapper. You got to repair to component level to make decent money. For this fact, the Apple store cant...

Have you triedv known good OS and correct memory?

If diskwarrior wont preview the volume. I'm getting good results with diskdrill.

I see a lot of this. Apple IDs get hacked and then your machines locked. The procedure to unlock through Apple is a nightmare. They want Photo ID + receipt with serial number. Suffice to say i just reprogram BIOS.

New stuff has UV indicators for water ingress.

Voiltage on L7330 ? If ok, then its Bad Ram slots or MCP or incorrect memory ?

I was a AASP for 10 years up until last week.......They are going to be pretty much closing all the small independant centres down in favour of their own stores and building a central repair facilty somewhere. This is the future. The only advantage remained was access to AST2 and genuine parts...

Did you check for any shorts on the s3 lines onwards ?

You could always install a clean version of OSX on the SSD, then migrate their data from the old HDD. That's the easiest way to fix software issues.

You can try scraping away at the hole in the hope the short disappears, however its usually a fruitless exercise. I just trash the board when this occurs.

I think i've seen a similar issue on another board, I'm sure it was resolved by a donor SMC.

Its not that we are trying to put you off, we have all been here in the past. These are the wrong boards to practice on, since its nearly always the MCP. Its been YEARS since you could buy a MCP with some confidence it will work. Trust me we have tried. If this was a backlight/usb/vcore problem...

Post picture of u9701 for us to check or remove it see if the board fires up.

The MCP89 is failing. Heat it up to see if it improves the graphics. If it does time to retire this board.

In the non working state which power rails are present ?

Replace u1900 to restore 32k clock.

No idea what it means. However it usually occurs after serial numbers are changed.