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It never works ok, it only has 2 different states of failure, power and off soon after or power on and run gpu fan at full speed. At both states it never chimes. I know it doesn't really worth spending time at it but for a bios I'd try it.

sometimes turns on and off after few seconds and other times runs the gpu fan at full speed without turning off

Hello, I have a mac pro that its working backplane was sold from my customer and he has installed a non working one and brought it for repair, so far I know that everything else was working. My only chance for fix is to test another bios [I have fixed one before]. So far I have made a dump of...

For your Information I reballed the VRAMs and that solved my problem, now systems boots OS and runs benchmark properly. That is being done with 216-0810005 that works as a perfect replacement of the 216-0810084 [6750HD instead of 6770HD]. The 216-0810084 & 216-0810001 are impossible to be found...

216-0810001 cannot be found new, so far 216-0810005 6750HD can replace the 216-0810084 6770HD without issue should I waist time with vram?

So I had this with gpu issue after some time at OS. Also VST was failing. I did noticed that it was going too slow at gpu benchmark before it crashed. I replaced 216-0810084 with 216-0810005 and after that I wasn't able to boot at OS. I placed a second good one 216-0810005 [I know that from this...

RTC area looks fine, at U2800 I get voltage at pins 2,5 & 13 normal, sadly no history for this board. System doesn't PRAM reset - this is also usual in some cases with GPU issue. PC3-10600 RAM was used from a same working macbook. Does it worth it to spend time? Maybe by replacing GPU and VRAMs...

So I have another one of them with 216-0810084 GPU that has a spinning fan but no chime and no signal/ backlight. I started by heating a bit the GPU but there was no difference. I have cpu vcore and gpu vcore. My only notice is that similar boards when they start they spin the fan for a couple...

Today I had same model for service, with the second display works perferct! Thank you duke for the instuctions.

SMC_LID is 3V measured right at R5171 pin1 and goes down to 0V with a magnet at the sensor

and how CPU died after GPU replacement?

Ppvcore_s0_cpu always 0V? You can try to pass with your soldering iron some leaded solder at the pins of U7400

The issue is that I don't have a same MacBook to make that test, but as I mentioned the issue happened after liquid spill and the path of liquid was from edje of battery through charging cirquit and near smc [without touching it] at the top side of the board only and LCD connector is at the...

Yes but as I mentioned if I pass a magnet from the lid switch I have backlight after that and the voltage drops to 38V. If I had and issue with the connector or the cable [both look fine] shouldn't I have permanent problem?

The MacBook had spilled liquid and the issue is that after some cleaning and replacing C5125 now chimes and display image but no backlight until I close and open again the display. After that it has backlight but if I close again the display the backlight doesn't go off. I couldn't find any...

Second worked ok. Leave the first one, too much time waisted here, I'm returning it.

I had it tested with external display but I hadn't heated it.I did some heating and display came alive! Now I'm replacing the chip. I didn't have any similar issue with no display because of gpu at this model so it wasn't my practice to heat them. Any hope for the first board also or not?

I do a lot of bga rework so it would hardly be bad soldering. Yes, for the second one I haven't spent any time by replacing the chip of anything else as I'm sure there's something else happening here. The only thing I got some measurements that match with the first board. Any hints where to start?

I have two same 820-2915-B [with 216-0809000] that have same problem, they chime and even start OS [I can hear volume up/down with 10.9] but they give no signal at display and no backlight. I have disconnected LVDS and tried with display port but without luck. The first one had lines at display...