There are all voltages on the card. Resistance of the 60 ohm pci controller, 1.6 ohm gpu, samsung 25 ohm memory. The card starts very long, then displays Black image with weird colored dots. GPU died or memory ??

If starts - try to test with MATS.

The card was tested in Mat Mods. The last of the banks in the C channel is damaged, after the replacement is still a black screen with dots. I removed the memory chip again. Guided by this : https://www.youtube.com/watch?v=syJIAWYfUAY&t=339s , I measured all points running to the core. At one point, the mulitimer showed 0.L looks like empty pad. What to do next?

GPU reball
---------- Добавлено спустя 7 минут 15 секунд: ----------
check contact gpu-vram

What is the memory channel you removed?
Does the BIOS of your card complains (via CRC32) to any of this card placed on the techpowerup's base?

In device manager car have error 43.I remove last bank on chanel C FBIOC [31: 0] .I measured resistance again ,most pads have 5K OHM , two or three have 3,1 -3,8 K OHM .Are such differences in resistance acceptable?

Use "diode voltage drop" mode on multimeter instead of "resistance mode". It has less random deviations.

After reflow gpu ,there was resistance on this empty pad 5K OHM. I soldered banks and the card gave the picture.Thanks for help.