GA-B85M-D3V does not reset, does not run code repair

GA-B85M-D3V does not reset, does not run code repair

GA-B85M-D3V does not reset and does not run code. Remove NR346 directly without troubleshooting.

Machine plate No.: GA-B85M-D3V Rev: 2.1

Fault phenomenon: do not reset, do not run code

Maintenance process: get the machine, the detection card display does not reset.

GA-B85M-D3V does not reset, does not run code repair Figure 1．

Remove it to the maintenance stand and measure the VCC as follows:

Memory: 1.5V normal

PCH: 1.05v normal

PLL: 1.5V normal

CPU: 1.75v normal

PCI-E A13 A14 CLK: 0.4V normal

PCI-E a11 reset: 0V abnormal

Intel’s board general timing no reset fault after the major VCC are normal

VCC xth will send a signal to the CPU to manage the mpwr01.

GA-B85M-D3V does not reset, does not run code repair Figure 2．

This board is made by IO, and the two resistance positions of nr345 and nr346 are next to io.

GA-B85M-D3V does not reset, does not run code repair Figure 3．

Measurement of n_PCH_Vrmpwrgd VCC is only 1.3V low, and the normal VCC should be close to 3.3V.

GA-B85M-D3V does not reset, does not run code repair Figure 4．

The profit of desktop board is low, so it is used to repairing the same board. Considering the time cost, do not look for the resistor and directly remove the nr346.

GA-B85M-D3V does not reset, does not run code repair Figure 5．

Remove the nr346, do not solve the problem, normal lighting, maintenance is over!

GA-B85M-D3V does not reset, does not run code repair Figure 6．