Question about Sony KP-46WT510 46" Rear Projection HDTV
I get momentary high voltage. HV-PROT signal (hv-prot), from A board is bringing it down. I keep horizontal out supply voltage (135V, I believe this is controlled by the high voltage regulator). I just loose drive from protection signal applied by CPU.
Is the voltage staying at 135 volts or is it rising?? There are several power supply fix it kits available as well as a way to test the power supplys. please let me know as I have a nice library of sony kits to use as well as a way to test the power supplys. Also a bad Crt can cause a shutting on and off of a projection set as well. If this is the case, try having the CRT rejuvenated and see what happens. please do not forget tp rate this htread.
Posted on Oct 16, 2006
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This is an indication that you have a problem on the power supply section or on the load because of the following reasons :
1. Over Voltage - the regulator might be cycling on over voltage due to lack of load.
2. Over Current Protection - excessive load or faulty power supply cycling will
trigger the over current protection circuit.
3. High voltage - there might be an excessive high voltage or some other system detecting an out of regulation condition. However, in this case, there should be some indication that the deflection and HV is attempting to come up - momentary whine, static on the screen, etc.
4. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive or drop of voltage.
5. A problem with the microcontroller, relay or its driver, or standby power supply.
This is not DIY and quite technical so I
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