RX580 graphics card is not repaired by booting up

Graphics card model: RX580

Malfunction: the graphics card is not booting up

Maintenance process:

A branded RX580 graphics card, the fault is that the graphics card is not booting up, the main VCC of the whole card is OK, the graphics card on the computer is not blocked by B2, and the test memory C D 2 channels report errors.

RX580 graphics card is not booting up repair Figure 1.
Using the graphics card test program to scan points, it is found that there are errors in C and D channels.

RX580 graphics card is not booting up repair Figure 2.

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RX580 graphics card is not booting up repair Figure 4.
Normally, the probability of two channels going wrong at the same time is very small, and the reset signal can be traced by point to point, because the resets of the C and D channels of A card, that is, the four video memories, are linked together and controlled by the core.

RX580 graphics card is not booting up repair Figure 5.

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RX580 graphics card is not booting up repair Figure 8.
Tracing the four video memories of C and D channels, passing Capacitor of 49.9 ohms and 120Pf, and then giving a 10 ohm resistor and a pull-down resistor before entering the core. Detect Capacitor missing part beside 49.9 ohms, and Capacitor broken at one end of the resistor.

RX580 graphics card is not booting up repair Figure 9.
poor line repairing。

RX580 graphics card is not booting up repair Figure 10.
Test on the computer again, successfully passed the self-check, and booting up entered the system to mine for 40 minutes, and everything was tested to be OK.