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Protect light is on

I have a hitachi 50dx01b and the protect light is on. i open the back and when you plug it up the green light onthe board will come on and then die out and the protect light will come on in pin 915R can any one help with this

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  • mastertdog Nov 30, 2008

    how do i know what to look for and how do i check a surge protector

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5 Answers

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  • Master
  • 4,806 Answers

Remove power at the wall and leave for an hour, hopefully this will reset the TV.

Posted on Nov 30, 2008

  • Lee Hodgson
    Lee Hodgson Nov 30, 2008

    would suspect the ballast, but try these first:








    Causes:

    Cause #1
    1. (Lamp may light and go out) suspect bad lamp part # 915P020010 2.
    Check for 12-volts DC at J-9 connector pin 4 on the Engine Driver PCB,
    if missing check for an open F9A09 on the Power PCB, if it is open
    replace F9A09 part # 283P127060 and the Light Engine part # 939P977010
    3. (Lamp may light and go out) Check for 5-volts DC at J-9 connector
    pin 1 and 2 on the Engine Driver PCB if low or missing check C9A37 and
    C9A38 both 3300 UFD 10 V part # 181P732040 on the Power PCB (part #
    930B921002) 4. At power on the lamp turns on and off three times and
    then the unit shuts down with a red lamp LED (lamp error). Replace the
    Light Engine part # 939P977010 5. Lamp enable line at J14 pin 6 does
    not switch to 5 volts after turn on, 12 and 5 volt supplies are good.
    Suspect the Light Engine part # 939P977010 6. Lamp enable line at
    connector J14 pin 6 on the Engine Driver PCB switches to 5 volts after
    turn on and does go to 0-volts (low) after 5 seconds, 12 and 5 volt
    supplies are good. Suspect the Lamp Power PCB (ballast) part #
    939P978010 7. Lamp enable line at connector J14 pin 6 on the Engine
    Driver PCB switches to 5 volts after turn on but does not go back to
    0-volts (low) after 5 seconds, 12 and 5 volt supplies are good. Suspect
    the Light Engine part # 939P977010. Good Luck


    if no joy here is the repair web address:
    http://www.tvrepairman.com/brands/hitach...

    kind regards


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  • Master
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Mostly protect light becomes ON when TV got problem in deflection section, especially in Horizontal deflection and Convergence out area.
Your should check horizontal output transistor, fly-back transformer and convergence ICs, IF you have experience of TV repair.
Please obtain related service manual form any service manual on-line store to rectify problem properly.

Posted on Nov 29, 2008

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The protect light is coming in your tv because any of the components like fuse , resistor ,capcitor is blown . You need to inspect this parts and replace it .

Posted on Nov 29, 2008

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You need to get the service manual to fix this:
Service Manual HITACHI 50DX01B
I will be offline for few hours, I can give more support when I come back online.

Posted on Nov 29, 2008

  • Ginko
    Ginko Nov 29, 2008

    You can ask also help from the other expert, that is well known for being a tv repairer.

    Thanks for using Fixya.


  • Ginko
    Ginko Nov 30, 2008

    Unplug the TV and the 915R surge protection unit from power, and plug them back after one hour or so, Try to bypass the surge protection unit and see if this was the problem.

    The surge protection unit should not be taken apart for safety reason, the 915R allows a maximum of 125 VAC, if there had been a bad voltage from AC network, that can have been the cause that started the protect light.

    Leave the surge protector unplugged few hours, and then connect it to a different socket, if it works, the only problem that you can possibly have are concerning the AC socket.


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You need to buy a service manual to help you with the repairs.

Posted on Nov 29, 2008

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