Hello,

I am troubleshooting a GTX 1080 Ti (GP102) and I have a strange issue.

I already performed several repairs:

GPU has been replaced

VRAM reballed and checked

Memory voltage MVDD ≈ 1.35 V stable

GPU core voltage normal

All memory rails present and stable

I also checked continuity between GPU and memory pads (with GPU and RAM removed) → all lines are OK.

However, when running MATS 367.56, I get write errors on all memory partitions.

Example report:

FBIOA [63:32] WR ERR
FBIOB [31:0] WR ERR
FBIOC [31:0] WR ERR
FBIOD [63:32] WR ERR
FBIOE [63:32] WR ERR
FBIOF [63:32] WR ERR

All channels show large write error counts, while:

Rank RD ERR = 0

Unknown ERR = 0

So the problem seems systematic across all memory channels, not limited to one partition.

Additional info:

Board: GTX 1080 Ti Founders Edition

MATS version: 367.56

Errors appear immediately during test

Already tried multiple reballed memory chips

GPU replacement did not change the result

This makes me think about:

memory controller issue

address / command line issue

missing signal like WCK / CK / CMD

or some problem around the memory power / controller area

Has anyone seen all memory partitions failing with write errors like this?

Any suggestions on what signals or circuits to check next would be appreciated.

Thanks.

Я долго видеокарту ремонтировал, реболил, не понимал, почему 1 канал памяти не работает. Сегодня стал замерять резисторы с обратной стороны и нашёл отклонение по сопротивлению. Стал резистор выпаивать и он разделился на половину.
Проверяйте все конденсаторы, резисторы, дорожки.
У вас явно проблемы с текстолитом или деталями на нём. Обрыв может быть в текстолите. Проще купить другую нерабочую карту со сгоревшим ГПУ и памятью и туда с вашей запаять.