Question about Sony KV-20FS12 20" TV
The set goes into a over voltage mode it looks like.I work for a small shop and I don't have a manual yet, i've got one on order. When the customer brought it in she said that the tv and also another one had been hooked up to the same UPS and both went out with in two to three weeks I did not look at the first set. The sony when powered up the LED on the front blinks 3 times, then it shuts down and blinks 4 times as long as it stays powered up. I replaced the STR regulator and I have the same problem. May be someone can give me a heads up on what might be defective. I would think the power supply, the B+ on the horz out collector is 136vdc. Not sure if that's correct.
A 20In set would probably be around 136v (give or take) while running
and would go much higher if it was going into HVS (High Voltage
Shutdown) 180v or so. The power supply is working (you have voltage).
Do you have a glow in the neck of the CRT? If not then it may be a bad resistor for the crt heater circuit. Most tubes use the top two pins on the neck socket for the heater, trace them back looking for a resistor, or simply test for voltage at the heater pins (AC), should be low 2-5 volts. If it is shutting down check the Horizontal Output Transistor (HOT) by using an ohm meter (with power disconnected :) ground the black lead and hold the red lead on the center pin of the HOT. Ideally you want an open circuit reading or very high resistance (MOhms), if you have low resistance it means either the HOT or the Flyback Xfmr is bad.
Hope this helps :)
Posted on Mar 11, 2008
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Posted on Jan 02, 2017
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This is an indication of a problem in the power supply. This problem can be in the switching power supply or in the high voltage power supply in either case there is some overcurrent or overvoltage condition which is cuasing the issue. Look for blown fuses and replace them, once this is done power on the set. If this works then great, but if not look at what is happening prior to the fuse blowing. Then using the schematic and a voltmeter attempt to find the shorted or open components by the lack of proper voltage readings. However if you do not have a background in electronics, I would suggest that call a TV repair shop and have this TV repaired.
I hope this helps,
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