Hi everyone!
I have three different V341 ver 2.2 cards with similar problems.
All of them have good vbios, passes tserver at high vmem clock. Driver is ok, no error 43.
The first card gives green screen when loaded and the VDDCI disappears
The second card does the same but this one gives green/pink screen when i bend the pcb where the vrms are. The core was reballed, it's not a core BGA problem.
The third card does the same but I removed everything that can pull down the vddci enable and moved the feedback from the GPU BGA ball to the vddci inductor output. Also changed the 12V input to external source. The capacitors seem good and I've replaced the GS7256 too.
(apw8722 has a better datasheet and I think it's the same ic)
After all this I've moved the core from the third card to a known good and it's ok, 90% it's a board problem.
What should I try? I have two more to fix and would be good to repair the third too.

there is a difference between apw8722 and apw8722A
see why there is no EN

I used this http://www.anpec.com.tw/ashx_prod_file.ashx?prod_id=533&file_path=20131021173259868.pdf&original_name=APW8722A/B/C/D.pdf datasheet for the singals, the chip is still the original GS type from other working card. What is the difference between the normal apw8722 and the A variant? The feedback reference voltage is the same, just the frequency is different. The APW8722A/D is the same 600kHz and the A has the inductor current limit so I guess the A verison is the same as the original GS...
The enable is a bit low, around 500mV, but it's also a comp pin.
R1022 is not placed and I've lifted Q1016 transistors 6th leg. This way the VDDCI should start when the card (the GS chip and the high side fet) gets 12V, but still nothing.
At the moment the other two "working" card have the correct enable and fb voltage untill the green screen crash. The card with the removed core doesn't have VDDCI at all but it didn't had it with the GPU core on the card after I heated the pcb area of the VDDCI (because I emoved the fets to measure them).
One thing I've noticed is the core VDDCI resistance is a bit low on all three cards, under 20ohms at 22°C but the core works fine on an other Sapphire board. And I've measured it on the desoldered core too and really the core resistance is low, not something on the PCB.

Look carefully at the Pin Configuration, APW8722A is not a joke

Used an original GS chip from a Sapphire nitro+ card, but I see the problem with the APW, pin 3 is not GND. What is the right replacement then, the D version? Not that it matters right now I have a lot of original working GS chips, but can't find the reason of not working. Every possible enable pulldown is removed and only the C5002 capacitor is on the en/comp pin. The other two capacitors aren't present.

check privat