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Only for training and service purposes.
ONE POINT REPAIR GUIDE
NO POWER
If the unit doesn’t work by no PVDD problem, repair the set according to the following guide.
1-2. FET
1-2-1. Solution
Please check and replace Q901 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1)
Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q901~ Q902 with a digital multi-meter.
If it is short condition, it’s destroyed.
Replace it with a new one. (Please replace 2 FET at the same time although several FET is OK)
* RN9 : Q901 + Q902 * RN7/ RN5 : Q901 Only.
1-2-3. Service hint (Any picture/ Remark)
< SMPS circuit >
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