Question about Philips Magnavox 51MP392H Rear Projection Television

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Alignment I have a 51" widescreen Magnavox projection type tv. I turned it on last month and noticed that the alignment had gotten severely off. It is not off on just an up/down, left/right basis. The colors are bending/bowing out from the middle towards the top and bottom. The packaged remote did not help much in rectifying the problem. Is there anything else I can try, b/c the serviceman did not help at all.

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  • artist_1986 Jul 28, 2008

    Thanks for the help. I will see what I can do and will post the results when I know them.

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Hello artist_1986,

It sounds like your convergence amplifiers have failed, and they need to be replaced. This is a common problem, however it could be as simple as replacing the two STK392-1XX amplifiers and the biasing resistors or as complex as replacing them and the convergence coils (I have seen and done both). There are many articles on the Internet on how to do this yourself, but I do not recommend them even though many of them actually work. I don't recommend them because they have very little to do with troubleshooting a problem rather then just replacing what you think is bad (shotgunning). I do however suggest having a qualified TV service person check the convergence circuit and see if it has failed. The charge for this is not expensive and you get a parts and labor guarantee if the parts fail in 30 days. I think this is the best course, however, if you still feel the need to fix this yourself do a search in fixya for convergence amp replacement and it will point you to a number of helpful instructions.

I wish you well,

Thank you,

Shuttle83

Posted on Jul 27, 2008

  • Henry McKelvey
    Henry McKelvey Jul 28, 2008

    Hello artist_1986,



    Here are some generick instructions for removing and installing the convergence amplifiers.



    I hope these help you in solving your problem.



    1) Get the schematic/service manual for this TV (You will need it because it contains the part numbers and component values you will need for replacement)

    2) On the schematic/service manual locate the convergence amplifiers (STK392-110, 120, 150) and the biasing resistors (Write the resistor values down from the schematic)

    3) Unplug the TV and remove the rear cover to expose the electronic circuitry.

    4) Using the schematic/service manual find the physical location of the two convergence amplifiers (Usually attached to a big metal silver in color heat sink) (Basically it will look like two big black six sided flat modules with a lot of pins on the bottom (18-22 to be exact)).

    5) After finding the heat sink and amplifiers remove the screws or the tension bar holding the amplifiers in place.

    6) Using a soldering iron and a de-soldering device (either a de-soldering pump or de-soldering wick) remove the solder from the pins of the amplifiers and biasing resistors that protrude from the solder side of the circuit board. (Take into mind that you may have to remove the board in order to do this, use the instructions in the schematic/service manual to do this, and make sure you mark everything you remove to make sure you have a guide as to how to put it back)

    7) After removing the solder from the pins off the amplifiers and the biasing resistors, remove the resistors making a list of the value, part number, and location on the board (all of this should be in the schematic/service manual). Then remove the two convergence amplifier modules taking care so as not to damage the circuit board. NOTE: The heat sink compound (the white goopy stuff) may have hardened and caused the module to stick to the heat sink, you will have to gently pry the module away from the heat sink, I have used a light application of isopropyl alcohol to dissolve the heat sink paste.

    8) Once the modules are loose from the heat sink, you can gradually remove them from the circuit board.

    9) Clean the heat sink off by using the alcohol and a heavy paper towel (remove all of the heat sink paste, and yes this is messy)

    At this point you have removed the two convergence amplifier modules and the biasing resistors and cleaned the heat sink.

    Now you will have to use your schematic/service manual to find the part locations, values and numbers you will need to replace the old parts I suggest replacing the biasing resistors first.

    1) Sort out the resistors you will need and as stated in the schematic/service manual and replace them according to the schematic/service manual locations and part numbers.

    2) Solder the components (resistors) in place making sure not to short out anything in the process.

    3) Apply heat sink paste to the metal side of the modules one at a time and the put the modules into the circuit board lining up the screw holes of the modules with the screw holes in the heat sink, use the removed screws or tension bar to hold the modules down once in place in the circuit board and on the heat sink.

    4) Solder the pins of both amplifier modules to the circuit board, taking care not to short out anything.

    5) Reinstall the board to the TV, reconnect all cables removed (DOUBLE CHECK EVERYTHING)


    If all went well the convergence amps should be working, and you will need to realign the convergence of your TV, I suggest using the AUTO Convergence feature of your TV (Use the instructions in the schematic/service manual).

    All should be good now.

    Now these instructions are generic in nature but can be use for a number of Models of Projection TVs.

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