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I just sent you a PM; but, I just made another observation. There appears to be a burn mark behind the white degaussing relay, close to two power resistors. I believe that is where the power supply driver transistor is located. If it's blown, you can bet that the STR53041 regulator (on the heatsink) is gone as well. Also, there are three low ohms resistors in series that are in the regulator circuit. IIRC, one is a 47 ohm, the other is a 15 ohm, and the other a 10 ohm. I'll have to dig up the schematic to double check. I think MAT electronics sells a kit that contains the regulator, the transistor, the resistors, and a couple caps.
Another thing that can cause power supply failures in these sets is a shorted CRT. Bad CRT's were very common on these sets and got to be very, very, very common by around '93.
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03-10-2009, 12:06 AM
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