Hello everyone,
a long time ago I replaced the PSU of a TX-L42 series LCD Tv. Now I have the bad PSU and I want to repair it, but have no luck so far.
I attach the schematic and the part where only the power supply unit is visible.
I have spent many hours figuring out, why mine won't start, but so far I have no answer. All the time I was looking at IC803 (A6259H) and its surroundings, but found no faulty component. Only thing I can't test is the transformer (T802) but I don't think it is faulty. I have ordered 2 replacement ICs for IC803, but when I wanted to start the circuit with the new one, it made the same nothing as the one before. So I would say that IC is fine. I measured every resistor, every diode, nothing seems off. I may be overlooking something obvious, but I can't put my finger on it.
Only strange thing is the Vcc line (PIN 5) of this IC. When I connect the mains, it slowly ramps up (in about 3 seconds) to 9.5V, and stays there. This IC needs around 15V to start, and as I read the datasheet, it should produce this startup voltage itself.
a long time ago I replaced the PSU of a TX-L42 series LCD Tv. Now I have the bad PSU and I want to repair it, but have no luck so far.
I attach the schematic and the part where only the power supply unit is visible.
I have spent many hours figuring out, why mine won't start, but so far I have no answer. All the time I was looking at IC803 (A6259H) and its surroundings, but found no faulty component. Only thing I can't test is the transformer (T802) but I don't think it is faulty. I have ordered 2 replacement ICs for IC803, but when I wanted to start the circuit with the new one, it made the same nothing as the one before. So I would say that IC is fine. I measured every resistor, every diode, nothing seems off. I may be overlooking something obvious, but I can't put my finger on it.
Only strange thing is the Vcc line (PIN 5) of this IC. When I connect the mains, it slowly ramps up (in about 3 seconds) to 9.5V, and stays there. This IC needs around 15V to start, and as I read the datasheet, it should produce this startup voltage itself.
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