Symptom: LCD TV has no faults.
Repair process: Open the back cover, measure the 300V power supply normally, measure 5V power supply is not, so the standby switch power supply is independent, so the initial judgment is that the management chip FSGM300N is bad. Can not have this chip at hand, decided to replace the test, the contemporary change before re-measuring the voltage of each foot of FSGM300N, found that 5,6,7 feet without 300V voltage, the problem is not in the chip? Turn off the electrical test switch transformer primary coil has been opened. Because there is no such thing, I decided to remove the rewind.
Slowly remove the core by placing thinner around the core.
The primary original yarn wrapped core is estimated to be around 21 filaments with an enameled wire 23 filament.
The secondary used multiple strands of enameled wire and replaced it with a 100-wire single-strand enameled wire.
After the repair, the sub-power supply is about 5.2V, and the TV on the test machine is normal.
In fact, this transformer has online, but the TV test machine is normal for 8 hours. Does it change after the original machine arrives? (The core is very brittle, some cores don't know whether it is paint or glue is not easy to dismantle), fortunately this is easy for me. It is risky to remove the switch transformer, do not imitate
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