Question about RCA 20F512T 20" TV

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TV will not power on

Took it apart and noticed fuse was blown. Replaced with good fuse. Blew the fuse. Then took another look at the rest of the circuit board and found that position RT801 model MZ73L 9Rm shows signs of electrical burns on the circuit board. Is there any way I can get this particular part and solder it in myself? Very familiar with electronics. Thanks

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How , i also took out this , thinking it has short circuited as the problem was exactly same . see what happens after chaging it

Posted on Mar 21, 2010

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The MZ73L is a posistor, its basically 2 thermal resistors back to back. One is connected across the mains, the other one connects the deguassing loop to the mains. When the TV is 1st turned on the mains connected R is cold so its neighbour is cold, that allows a large surge of current into the degaussing coil. The mains connected one rapidly gets hot and heats up the other one, this increases the resistance of it and the current being dumped into the degauss coil fades away. As the 1st one is a heater it will get hot and you will see signs of heat on the PCB, BUT its still a very good place to start. The heat is normal, but if the 1st ceramic disk in it has died then you will short the mains and blow the fuse with it.

Posted on Apr 20, 2008

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You will need to acquire the service and parts manual. This will guide you to the correct part number(s) you'll want to order. Any reputable parts dealer can help you in that aspect.
What usually causes these types of problems is a failure of the device itself or a "chain reaction" sort of event, causing the visibly defective part to smoke through no fault of it's own. Be sure to check for proper voltages before condemning the wrong area. Hope this helps...Accordianman

Posted on Nov 04, 2007

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