Gigabyte GA-H77-DS3H black screen repair

Gigabyte GA-H77-DS3H turns on the black screen and brushes the BIOS fault contact.

Machine model: Gigabyte GA-H77-DS3H

Fault phenomenon: the screen is black when starting up, and the code 15 jumps to 32 and gets stuck

Maintenance process: First remove the mainboard to test whether all power supplies are short circuited to ground, and no short circuit is found. Then test that the memory voltage, bridge voltage, bus voltage and CPU voltage are normal.

Next, the test showed that the 3.3V reset of PCIEA11 pin was normal, and the clock voltage of A13 and A14 pin was normal. There was no clue. Let’s go to the third board axe. The display shows that a BIOS has been flashed, the motherboard has two BIOS, and a B has been flashed_ The BIOS, the main BIOS, is automatically restarted for more than three times after startup. An interface appears, which looks like a dual BIOS. It is automatically copied to the M_ The BIOS interface is stuck because the second BIOS is not installed.

Once the two BIOS were brushed to be the same (the dual BIOS program is the same), the system started up for testing, restarted several times, and then it was normal. The maintenance is over.