Re: Philips 32PFL5322D/37 power supply repair
There are 4 diodes under the heat sink. I've been probing around, and the 9v appears until I cross the diodes, then the voltage drops to 0. If I measure the voltage drop across the diodes, it is 9v. Checking in diode test mode shows all diodes with 154 ohms resistance on the inner two, and 158 ohms on the outer two. Putting the probes in reverse the reading rises, so it looks like they are not forward conducting.
Normally when I test diodes the resistance is in the 500 ohm range. Could I be onto something, or look somewhere else?
By the way, the diodes are connected directly to the secondary side of the larger transformer on the anode side.
Edit: One more thing I noticed: I encountered 18.4v on the board while tracing. It is present on the connector for the inverter board. Now everything I've read indicates inverter boards use 24v power. And 1/2 of 18.4 is right about 9v (I saw 9.14v). Could this be a clue?
There are 4 diodes under the heat sink. I've been probing around, and the 9v appears until I cross the diodes, then the voltage drops to 0. If I measure the voltage drop across the diodes, it is 9v. Checking in diode test mode shows all diodes with 154 ohms resistance on the inner two, and 158 ohms on the outer two. Putting the probes in reverse the reading rises, so it looks like they are not forward conducting.
Normally when I test diodes the resistance is in the 500 ohm range. Could I be onto something, or look somewhere else?
By the way, the diodes are connected directly to the secondary side of the larger transformer on the anode side.
Edit: One more thing I noticed: I encountered 18.4v on the board while tracing. It is present on the connector for the inverter board. Now everything I've read indicates inverter boards use 24v power. And 1/2 of 18.4 is right about 9v (I saw 9.14v). Could this be a clue?
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