I'm now in possession of this very old 2005 plasma TV, the original failure described to me was that it only turned on after hundreds of attempts, eventually it just stopped working.
It has stable stand-by 5V and 4.4V AC-ON voltages, the main board red LED lights up, it has all of the secondary voltages generated by standby: 3.3V, 2.5V and 1.8V. Trying to power on via remote or power button does nothing, the signal is received, but it's stuck.
The power button was bad, replaced but that did not fix anything, replaced 10V 1000uF, 25V 470uF, 50V 47uF and 50V 10uF capacitors at the power supply, those are responsible for the 5V filtering and 5V switching controller, nothing changed.
Soldered a 100 OHM resistor between 5VSTB and RL-ON, 12V/19V/3.4V/5V worked fine.
I've measured mostly everything and no there's no shorts, no open inductors, no visible damage. There's two switches, one of them resets the main FLI8532-LF processor, the other one does nothing on stand-by.
Replacing the main board is a bit expensive costing about 1/3 of what the TV is worth, so I want to repair this one if possible, but I have no clue what to do next.
Main P/N: 6870VM0548E (5)
Service manual link:
https://www.manualslib.com/manual/74...px4rv-Rva.html
It has stable stand-by 5V and 4.4V AC-ON voltages, the main board red LED lights up, it has all of the secondary voltages generated by standby: 3.3V, 2.5V and 1.8V. Trying to power on via remote or power button does nothing, the signal is received, but it's stuck.
The power button was bad, replaced but that did not fix anything, replaced 10V 1000uF, 25V 470uF, 50V 47uF and 50V 10uF capacitors at the power supply, those are responsible for the 5V filtering and 5V switching controller, nothing changed.
Soldered a 100 OHM resistor between 5VSTB and RL-ON, 12V/19V/3.4V/5V worked fine.
I've measured mostly everything and no there's no shorts, no open inductors, no visible damage. There's two switches, one of them resets the main FLI8532-LF processor, the other one does nothing on stand-by.
Replacing the main board is a bit expensive costing about 1/3 of what the TV is worth, so I want to repair this one if possible, but I have no clue what to do next.
Main P/N: 6870VM0548E (5)
Service manual link:
https://www.manualslib.com/manual/74...px4rv-Rva.html
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