Hi All,
Safety resistor RM801 burnt out on switch on. Apart from that no visible distress on any other components on power board or inverter board.
Replaced this and Mosfets QM801, QM802 (FQPF9N50C), with more hope than conviction. Checked all diodes in situ and they appear fine.
Powered up initially without mainboard, inverter or backlight connected. After connecting these items in sequence, TV worked as normal. I probably turned TV on and off about half a dozen times over the next 3 hours and everything was ok. However, next morning, on switch, another crack and burnt out RM801.
It appears a surge is knocking out RM801. Any suggestions welcome.
Electronic knowledge about 30 years out of date.
Safety resistor RM801 burnt out on switch on. Apart from that no visible distress on any other components on power board or inverter board.
Replaced this and Mosfets QM801, QM802 (FQPF9N50C), with more hope than conviction. Checked all diodes in situ and they appear fine.
Powered up initially without mainboard, inverter or backlight connected. After connecting these items in sequence, TV worked as normal. I probably turned TV on and off about half a dozen times over the next 3 hours and everything was ok. However, next morning, on switch, another crack and burnt out RM801.
It appears a surge is knocking out RM801. Any suggestions welcome.
Electronic knowledge about 30 years out of date.
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