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In the meantime I found the problem. I started changing the caps on the PPGPU rail and after a while it started working again. :)

In initial state phone was only searching for service. Then I changed U_DSM_RF. Now it stop searching after a while and then it just stops with no service. Any ideas what should I do next?

No history. It does not seem to have liquid damage and corrosion. There is image if I connect an external display. Though it freezes at half of boot. Also I could not seem to able to boot from external HDD. So it seems a bit more complex. I am not able to test with another LCD. Where should I look?

I did connect it. It will recognize the battery but wont charge it. OSX status: "Replace now ".

Any further suggestion?

This is weird: The board stayed some days put aside: now it works perfectly. Tried in in the case and everything seem to work. But this time I was afraid to connect the battery. Last time I connected it the green light and all the rails went to 0. So it is possible that a fried battery would do...

Coffey spill. But board did not get too much damage seemingly. Only obvious thing was a cap (C1910). I changed that. After that it did catch green light, it even started okay with lcd. Then I connected the battery (which had corrosion before on the logic board part ). After that the green light...

No liquid damage or anything unusual. It was sucking around 0.2A. Changed U2. After that 0.6-0.7A. Still wont turn on. Measured important power rails that go in and out of PMIC. Most of them are okay, except: PPCPU is 0.5v instead of 1v PP_GPU_SRAM is only 0.15V PPGPU is missing. I did measure...

I can not boot into ASD.

A1224 (EMC 2210) It wont start at all. Only first diag led is on. When I want to turn it on the fan spins up for a second (quarter fanspin style) and at the same time the second lend blinks one time. Tried with another good power supply. It does the same. Ideas?

A1224 (EMC 2210) IMAC boots extremely slow (45 minutes). Tried with another HDD, hdd cable, external hdd and ram. Same issue. Any idea?

I changed LP8550. (not working the backlight) PP3V3_S0 directly to LCD_BKLT_PWM(working) Thank you! Maybe the smc.

LCD_BKLT_EN 3.32V PPBUS_SW_LCDBKLT_PWR 12.58v LCD_BKLT_PWM is 0V SMC_LID is 3.4V with lcd :I :)

Yes. Tried with flashlight from back.

No liquid damage. SMC_LID is 3.4V LCD_BKLT_PWM is 0V LCD_BKLT_EN is 0V PPBUS_SW_LCDBKLT_PWR is 0V Tried with another LCD too...

Connector seems fine. SMC and U5010 looks fine too, I do not think there is crap under them cause this was not liquid damage. Board was put aside for some days. Then charger light wont even come back at all. So we changed the ISL. This time charger light comes on sometimes instantly sometimes...

D6905 is 14V. R6905 is 33 oms. Resistance to ground on L6995 is around 17k omhs. I also just noticed that the MCP was messed with. (Possibly reflowed/reballed/changed who knows)

No liquid damage. PP3V42 is 0.6V PPBUS is 1.2V ACOK is 1.1V Change C7771 as usual culprit? Any other suggestion?

It is a core i5 mid 2011 EMC 2429. Tell me if you want the board number too....

Booting only half way then it reboots. Sometimes with a horizontal line across the top. Tried with good boot HDD and another PSU. Same Any idea? I read in another post that it may need a clean ME. Could that be the case?