Question about Panasonic PT-53TW53 53" Rear Projection HDTV-Ready Television

1 Answer

I attempted a repair

Thanks, I chatted with another expert and what you proposed is dead on. It was mentioned that I may have blown or "opened" a pico fuse. I have the service manual and have found the schematics and picture of the board but I dont know how to identify the pico fuses and am unsure how to test them with a meter. And as far as following the the trace to the next solder joint, do you mean the next spot of solder on the trace? This may not be the most advisable but could I scratch the trace and afix solder to that, my reason being I don't want to expand the scope of my problem to other components on the cb. so to sum up 1) identify pico fuse on schematic 2) testing fuse 3) creating jumper to pins Thanks for your help, Matt

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  • mattmro Apr 10, 2008

    thanks! So if there are not any pico fuses that can be affected do you have a suggestion for a place to start testing on the board? I have a manual, if you could give me coordinates on the D-board I made a flikr page for the schematic, the chip I changed was the diagonal one, I hope the images are big enough, be sure to click on "all sizes"
    -http://www.flickr.com/photos/25491690@N07/?saved=1

    . P.S. I found a stray wire with a single 1 mm-ish wide female plug when putting the plugs back, its has a "D42" drawn on it, did I miss something?
    thanks again,
    matt

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  • Panasonic Master
  • 8,617 Answers

There is no pico fuses in that model that can be affected by the convergence circuits. You can scratch the trace and attach solder to it. Thats usually not the best way to do it as its susseptable to becoming dislodged. pico fuses are usually identified with FL (fusable Link) in the part location, just test them with an ohms meter for continuity in circuit.

Posted on Apr 10, 2008

  • Sonny Berry
    Sonny Berry Apr 10, 2008

    How you trouble shoot that circuit is start at the Convergence IC. For example if your having trouble with the red vertical note which pins are the input and returns in the ic for the red vertical and locate each item in that circuit and test. resistors and Diodes have to be removed from circuit to tesy, transisitors should also be removed from circuit unless you have a transistor tester that will check them in circuit. And capacitors are really only able tp be properly tested in circuit withan ESR meter. Do you have any of these items that you can use to check the components. If so they will make quick work of finding the trouble. Its a tedious proceedure, but I always list all items in the circuit I am working on and check each item in turn you will locate the problem, Just dont rely on any reading you get from a component that is in circuit other than a fuse, unless you have a good transistor checker and an ESR meter then you can check everything quickly in circuit with the exception of resistors and diodes they need to be pulled out of circuit at least one leg .

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