Question about Projection Televisions

2 Answers

Audio is fine, but video will off after 5min ON time

My TV after turn on all will work fine for first 5min. then the screen become blank but audio and channel change are work fin.

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  • howac506 Aug 05, 2008

    Hi Sir;

    Thaks for responce. Here are the informations you listed.

    1) My TV set is Mitsubishi VS-4507R Rear projection TV.

    2) Before the picture goes out, it was nothing happen, the picture just goes suddenly.

    3) No front panel light.

    4) The sound is caome from TV. I did not hook with anything.

    5) I connect direct to the cable. but no cable/sat. box.

  • howac506 Aug 07, 2008

    Thanks! I will try it. Dos this IC is LA7838

  • MICHAEL MULLINS May 11, 2010

    Good Day, howac506;



    Okay, no pic/has audio after 5 minutes, this is a very generic concern. Let me ask you some questions and make some suggestions so maybe we can solve this problem:



    1. What brand and model number is your TV? (small paper sticker on rear of TV)

    2. Does the picture do anything before it goes out? (turn a color or lines etc.)

    3. Does any front panel lights blink? (how many & which ones)

    4. Is your sound from the TV or stereo?

    5. Do you have cable/ sat box?



    Sorry, I was not helpful this day but give more information and I will help you as best as I can.



    Thanks, big IRISH. ps Too many TV's and types (dlp, lcd, rear projection), again, sorry.

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2 Answers

Hi;
Thaks! I will try it.

Posted on Aug 09, 2008

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  • 927 Answers

Good Day, howac506;

The most common problem for your 1991 TV is the vertical out put IC (IC) part number 272p239040.

I hope this was helpful.
Good Luck again, big IRISH.

Posted on Aug 06, 2008

  • MICHAEL MULLINS Aug 07, 2008

    LET ME KNOW IF THIS HELPFUL.

  • MICHAEL MULLINS Aug 08, 2008





    Good Day, howac506;
    Like I stated it more than likely the vertical out put IC but here is a more detailed way to trouble shoot and repair of your TV:
    SHUTDOWN CAN BE CAUSED BY NO VERTICAL DEFLECTION. SINCE THE VERTICAL CIRCUIT IS POWERED BY THE SWITCHED POWER SUPPLY THE UNIT MUST BE TURNED ON TO TROUBLESHOOT THE CIRCUIT. THIS CAN BE ACCOMPLISHED BY TEMPORARILY DISCONNECTING THE VERTICAL INPUT TO THE X-PROTECT CIRCUIT. ** TO PREVENT DAMAGE TO THE CRT'S YOU MUST UNPLUG THE CRT PCB'S. ** TO DEFEAT THE X-PROTECT CIRCUIT, UNSOLDER D4A1 LOCATED OFF THE COLLECTOR OF Q4A1. IF THE UNIT POWERS ON AT THIS POINT, YOU HAVE CONFIRMED A VERTICAL FAILURE AS THE CAUSE FOR SHUTDOWN. ** D4A1 MUST BE REINSTALLED IN CIRCUIT TO PREVENT CRT DAMAGE. ** 2. WITH VERTICAL PROTECTION DEFEATED (D4A1 OUT OF CIRCUIT) WHEN THE UNIT POWERS R514 (PIN 11 OF THE FLYBACK) OPENS. CHECK PARALLEL CAP. C512 .33 UFD 400 V IF C512 IS GOOD REPLACE THE FLYBACK PART # 334P191020 ON THE MAIN PCB. 3. CHECK PIN 1 OF IC401 FOR 10.7VDC. IF LOW OR MISSING CHECK FOR SHORTED D4000 (PART #264P487030) LOCATED OFF PIN 1. (PCB-MAIN) 4. CHECK PIN 8 OF IC401 FOR 28.4VDC. IF MISSING CHECK FOR OPEN D520 AND R540 AT PIN 5 OF FLYBACK TRANSFORMER T503. (PCB-MAIN) D520 PART #264P102020 R540 (1.2 OHM 1/4 W) PART #103P398010 5. CHECK FOR DEFECTIVE IC401, PART #272P239040 ( PCB-MAIN) 6. CHECK R540 1.2 OHM 1/4 W OFF PIN 5 OF FLYBACK (PCB MAIN). 7. EXCESSIVE 130V SUPPLY. CHECK C911 47 UFD 100 V AND C914 47 UFD 50 V, IN THE IC900 CIRCUIT.
    Good Luck, big IRISH.

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