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Bad sensor, figure out how to download and run ASD 144 and tell us what error it throws

Is the screen your using known good? Its rare for the fuse to blow, are the measurements your taking with a screen plugged in or unplugged?

Theres a short somewhere, Could be the LP8850, could be the connector you plugged a bad cable into, They burn up quickly if plugged into garbage. Whats the resistance to ground on the connectors backluight output pins?

Yes, the only way i got mine done easily was because it apple put weak glue on mine. it was a previously recalled board. i will be interested to see if it fixes your issues.

Both of them had liquid damage, both only around the lp8550 though, corrosion on them was minimal. With the kernal task being high i really want it to be a bad sensor but they pass ASD EFI and all other sensor tests ive ran

Hi I had a 820-3332 that had no boot issue, Even after doing the U8900 it was the same, I replaced the GPU and it is now fully working. If its not working i would try a v-ram reflow or something, Doing GPU's on these boards is tricky and its much the same as the 2915's with the vram being...

Check U1950, often the cause of a CPU running cold/no post.

Hell, try reflow/ reball one and watch the CPU warp super bad, Havent figured a way round that yet myself.

You sure your screens are for 2015?

Have you checked the strapping resistors? What VRAM is the board sporting? It sounds more like a soldering issue, but it could be VRAM straps

Bottom cases are probably not the same but its from a company that often switches shells around. Its passed the ME region presence in ASD EFI, Is that not enough? i guess i could reflash them. Yeah, i feel like there going to start giving me a 1.1v v-core/no post symptom soon enough.

I have 2 3209's here. both from the same customer, Both came in with bad backlights, Both Core i7 2.0GHZ/8GB boards. Both shut down frequently and have high kernal task. Both pass ASD EFI, and internal diagnosis. I have been using techtools pro to test them in OSX, all sensors are reading...

figured that, had a dead 16+ from them the other day, couldnt fix it.

Hi I have an 820-2915 that came in with no power. It had no signs of liquid damage, however 2 of the three GPU rails where dead short to ground. It had signs of an apple refurb previously. i fitted a new GPU, shorts gone, however it very rarely produces an image at all. The fan spins up twice...

inspect u1950 before you send this out. If the V-core is present but the CPU doesnt get hot U1950 is the usual cause. Check this before you send it out/sell it to prevent chance of returns

Could be a bad SMC, Whats the PBUS voltage? 8.6V or 8.1V?

Yeah, i got a misprinted stencil, so im balling them by hand takes me about 25 minutes start to finish which sucks. Anyway, Gmux replaced and board is now fully functioning. Thanks

OL on LVDS_CONN_B_CLK_F_N takes me right back to thinking its the gmux. Compared against another 2914 board and got different results. Will change the gmux and report back.

How should i check them? i havent checked the traces for continuity to the gmux. I have checked all GMUX related resistors though.

Duke it has 33v on backlight output (at the LVDS) i ran PRAM resets, and it went up to 35V. The screen remains black with the backlight present. As far as i can see its probably a fried GMUX. The machine came in with physical damage to the LVDS. all we did was replace the LVDS, should be a...