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Repair of GA-H61MA-D2V without VTT power supply
GA-H61MA-D2V No VTT Power Supply Replace RT8120D Remove Q6 Q7 Q8 Q9 Pin Remove TR65 33K Resistor Replace 34K Resistor Replace TR65 Power-on Test Normal Bright Machine.
Machine model: GA-H61MA-D2V
Fault phenomenon: no VTT VCC
Maintenance process:
Repair of GA-H61MA-D2V without VTT power supply Figure 1.
The auto restart will not stop when the auto restart is on for maintenance
Memory: 1.53v normal
PCH: 1.06v normal
PLL: 1.83v normal
VTT: 0V abnormal
No VTT VCC
It is the same to replace rt8120d, and it is the same to replace another one.Remove the Q6 Q7 Q8 Q9 control system and completely remove it (two of which should be VTT ˊ en’s) or the same.
Repair of GA-H61MA-D2V without VTT power supply Figure 2.
When tq1, tq3,MOSFET, grade g, ground,diode value, upper tube 600,or so were normal, and lower tube g pole 110 was lower.Remove the tr65 33K resistor and measure that the tr65 diode value is only 12K low.
Repair of GA-H61MA-D2V without VTT power supply Figure 3.
Find a 34k resistor in 78mlt-s2 Parts motherboard and replace it. The lower tube tq3 g pole to ground diode value returns to 500 + normal.
Repair of GA-H61MA-D2V without VTT power supply Figure 4.
Power on test VTT recovered 1.05v, normal, u test normal light, replace tr65 fault solved!
Repair of GA-H61MA-D2V without VTT power supply Figure 5.
