Hi all, looking for tips on how to test the on board inverter on power supplies for the larger (50") Samsung power supplies. I'm getting more & more of these in lately , mainly the caps/relay clicking issue but now had a few where there's possible inverter problems i.e the complaint is Sound is ok but no display .
Obviously i can't have an inverter board/panel in stock for every different PSU that comes in so i need a way of testing just the inverter circuitry built into the PSU. I understand that the PSU connects to Inverter balance boards that distribute the high voltage equally along to the tubes but i need to be able to just check the onboard circuitry. also, although i have the service manual for the receiver (LE52M87BDX) the circuit diagrams do not show any of the inverter circuitry , just the normal standby & DC outputs. Anyone know:
(a) where there is a circuit showing the inverter circuitry ona 50-52" set
(B), Whats the output voltage from the transformer that connects to the inverter balance boards.
(c) should i be able to connect normal CCFL inverter tubes directly to this transformer output or do i need these balance boards. I dont want to overdrive the onboard inverter by caoonecting a couple of tunes up directly. I know the output will be over 1KV so need a reliable way of safely testing without the inverter circuit shutting off.
Thanks in advance
Graham
Obviously i can't have an inverter board/panel in stock for every different PSU that comes in so i need a way of testing just the inverter circuitry built into the PSU. I understand that the PSU connects to Inverter balance boards that distribute the high voltage equally along to the tubes but i need to be able to just check the onboard circuitry. also, although i have the service manual for the receiver (LE52M87BDX) the circuit diagrams do not show any of the inverter circuitry , just the normal standby & DC outputs. Anyone know:
(a) where there is a circuit showing the inverter circuitry ona 50-52" set
(B), Whats the output voltage from the transformer that connects to the inverter balance boards.
(c) should i be able to connect normal CCFL inverter tubes directly to this transformer output or do i need these balance boards. I dont want to overdrive the onboard inverter by caoonecting a couple of tunes up directly. I know the output will be over 1KV so need a reliable way of safely testing without the inverter circuit shutting off.
Thanks in advance
Graham
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