Question about Hitachi 50VG825 TV

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Our Hitachi combination projection color tv and dvd player 46W500 has sound but has no picture. The screen flashes green then purple. Any help would be greatly appreciated. Thanks

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  • lindsay742 Mar 12, 2011


    The other day we were trying to hook up my laptop using the S-video cable to the Hitachi. I hooked up the laptop while it was on and the program was on too. And at that point the tv was still working but we could not view what was on the laptop on the tv. So I read up on hooking laptop to tv and it stated to connect the cables first then turn on the laptop. I am guessing doing the hook up wrong has created the problem? Cause the next time we went to use the tv we had the green screen then purple screen. I checked right now and the tv screen was purple then green then purple etc. What needs to be done? Thanks for your help.



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If you have the Hitachi rear projection TV, then there are different defects that will result in sound but no picture. The purple light is not an error code.

First check if problem is affecting the signal from external DVD or any other external source. If the problem is only on one source, then the fault is a connection cable. If it happens only with the internal DVD, then the problem is the internal connection cable

More commonly you will get sound but no picture with all sources. In that case the first part to be tested is the board that supplies power to the lamp (someone calls it ballast). If the board is OK and powering the lamp, then the lamp must be replaced even if lamp light is not on. The ballast is an high voltage board-it must be tested by a technician.
If ballast does not get power, then the PSU must be tested. The PSU supplies power in different voltages. The DC line to lamp is not coming up. If PSU is OK and lamp ballast is OK, then problem is light engine or main controller.

Here all parts: Hitachi 46W500 Parts List

Here a service manual. A few dollars fee is required for download: Hitachi - 46W500 Service Manual



Posted on Mar 11, 2011

  • Ginko
    Ginko Mar 12, 2011


    The laptop DVI port, as well as HDMI and USB port carries +5VDC power signal. If the laptop is on, an occasional short while plugging in can damage one of the ports, or even the main controller board.

    If the problem does not go away by disconnecting TV power cord for ten minutes, then there is some defective component inside the TV. Testing will start from terminal board, which includes the DVI and other input/output connectors on the TV.
    Testing must be done by a technician working at component level.



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