Question about Philips Magnavox 51MP392H Rear Projection Television

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Replaced ICs, now fuses are blowing

So I rearranged my room and the night I moved my TV, the convergance blew. Thinking it must have been due to moving and not knowing anything about televisions, I opened the back and tried to adjust the blue lamp, thinking it had come loose. It hadn't but what was loose was the screw that seals the fluid in the lamp. It had a few drops on the board, and when I touched the lamp, a few more dropped, and the fuse right under it blew. At this point, the TV would still turn on and off, I would hear the mechanical 'click' when powered on, but the secondary 'click' and the picture were no longer present, obviously because the fuse was toast.

So, I did some reading on here, changed the two ICs which was really easy, cleaned up any drops of that fluid, put it all back together, and now as soon as the plug touches the outlet, the fuse right next to the power cord immediately blows, and that other fuse blows in a less dramatic fashion. As a side note, there are 3 rectangle resistors 3301, 3302 and 3365 in the vicinity of the other fuse that are labeled 220R but measure 75 ohms, and the 6.8 ohm resistors around the ICs all measure 4.0-4.1 ohms.

My two questions are, 1, what could I check in the region of the power cord that could be causing this immediate fuse blow that was before not present? 2, should I be replacing all of the above-mentioned resistors,or am I doing something wrong in measuring them? It's strange that they're all measuring incorrectly at a consistent value.

I am a novice and really appreciate any help that anyone might be able to provide.

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  • Dirt McGirt Oct 18, 2008

    I did not use a ground strap when replacing the ICs, but I am pretty sure I have the pins properly aligned.

    When you say I have direct short to ground, what does this mean? Should I be simply checking for an improper connection somewhere, or something else that is causing improper circuit path? Or am I likely seeing something physically failed?

  • Dirt McGirt Oct 18, 2008

    I actually do have a schematic, found here:

    Wouldn't I need to have power to the set to test voltage? I can't get the plug into the wall without blowing the fuse.

  • Dirt McGirt Oct 18, 2008

    I just disconnected the connection between the board with the power cord and the board with the main power supply and plugged it back in. The fuse near the power cord didn't blow. I was also able to turn the tv on, heard a 'click', but obviously no picture or sound or anything because the two boards are disconnected. So I reconnected the power between the two boards and fuse 1300 near the power supply immediately blew. So I guess I should be checking in and around that area. From the manual:

    The Full Power supply is located on the Large Signal panel. The Raw B+ voltage from the Input panel is applied to the Full Power switching transistor, 7301, via Pins 6 and 8 of transformer 5300. This voltage is protected by Fuse 1300 and filtered by Choke 5330. The Standby line goes Low when the set is turned On. Transistor 7309 is turned Off, which turns 7300 On. This turns Relay 1305 On. Startup voltage is applied to Capacitor 2303 via resistor 3300. When 2303 charges to 14.5 volts, the undervoltage lockout of 7302 connected to Pin 1 is turned On. Drive is output on Pin 3 to the Switching FET, 7301. This drives 5300 to produce the Full power supply voltages.

    Transistor 7301 is right near where the fluid spill was. I don't know how to test a transistor, but would that be a good bet to replace?

  • Dirt McGirt Oct 20, 2008


    Thanks so much, I'm going to see if I can pick up an analog meter and follow the directions on that link you provided.

  • Dirt McGirt Nov 07, 2008

    I replaced 7301 with a transistor of relatively similar specs (since the original seems to be obsolete), and bingo, high definition television! Thanks so much for your help!



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Did you have a ground strap to your wrist when replacing ic's and make shure you put the 1on the 1on th ic slot you have direct short to ground

Posted on Oct 18, 2008



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