Question about Mitsubishi Televison & Video

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Repairs to HD1080 TELEVISION

POWER BUTTON DOES NOT REMAIN ON FOR OVER 5 SECONDS

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  • kavita chankadyal Jun 25, 2008

    when power is turned on ,it goes off after 5 seconds. there is neither sound nor any picture on the screen

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7 Answers

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Hi,

The reason the power light goes off after five seconds is because the power system is not energizing, You are getting power to it or there would be no light.

There are user replaceable fuses in most case and not in others. If you are going to remove the back of your set you need to adhere to these safety measures.

1.) Power is stored in high capacity capacitors that can contain up to 4,000 volts. Should you touch these you will get severely shocked and have a nasty burn to deal with.

2.) Do unplug your unit and do not do this without shoes on more specifically sneakers.

3.) Have someone with you in case you are electrocuted who can call 911 and provide cardiac resuscitation if you need it.

Have a plastic flashlight on hand to look at the area of the set immediately around the main power transformer where the cord comes in. Look for the easily recognized inline fuses you'd expect to find. Depending on your set you don't have any or you may have several. Give those a good look until you are certain the internal wire is present or burned in half near the center. Should any be blown carefully remove them by lifting one end up with a small screwdriver and then use a pair of pliers to gently withdraw the fuse completely. Do not do this barehanded. There are rating markings on the silver colored ends of the fuses giving amperage ratings and replace these fuses with an identical rated fuse.

If you do not find any blown fuses that doesn't mean all hope is lost you just won't be able to service it yourself. Have a qualified service technician come in and service the set if its worth it to you.

Regards,
Worldvet

Posted on Jun 25, 2008

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Hi,

The only easy user option I can forward is to try a full hard reset. Though it may sound much, it is actually nothing more than simply unplugging the Mitsubishi from the mains for a couple of hours (preferably overnight). The idea is to revert most (if not all) settings back to factory default.

If you can likewise hear a clicking sound coming from the rear, then that would mean the auto-protection is kicking in and is keeping most of the internal circuitry from powering up to prevent further damage, Having said this, then it would mean that it is no software glitch and there is a hardware fault. Often problems would involve power supply circuitry (a blown capacitor is most likely) together with other components such as pico fuses, resistors, regulators to name a few.

At this point your best bet may be to seek the services of a qualified personnel. Should you venture to perform a DIY, pls be reminded that diagnosis/repairs would call for familiarity with electronic circuitry and components, use of a DVM and a soldering iron and access to a service manual or at the very least a schematic diagram with voltage settings.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 25, 2008

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Dear Sir,

Let's hope it is just a corruption of the software codes in the power management circuits of the TV.

Do a hard reset and see if that will bring it back to life.

HARD RESET: Merely unplug the power cord for 4 hours. Then power it back up again.

If this does not solve the problem it means there are other problems. So, let me know the outcome.

Good Luck

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Posted on Jun 25, 2008

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Power on and it goes off after 5 seconds ,,the system is automaticaly shut off the unit this is of two causes cold solder or crack of the joint in the power supply section ,and to the horizontal section .and the other one is shorted Horizontal Output Transistor, If HOT is shorted the unit power on and goes off like yours.HOT produce the high voltage that we can the see picture. Automatically shut off the system because shorted HOT,and trap the voltage of power supply..only you do is to change the transistor in the horizontal section ..so your tv will works again.this is not cost too much...


Posted on Jun 25, 2008

  • LORETO LACARON
    LORETO LACARON Jun 25, 2008

    You better find a technician to do repair for you, to avoid high voltage shock. only to change the transistor and little reheating...

  • LORETO LACARON
    LORETO LACARON Jun 25, 2008

    fuses are nothing to do this problem because of the indication of power automatically shut off. if fuse are blown you cant turn on the unit... this unit is turn on then shut off..

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It is a power issue, you will need to have the tv serviced. If you need their contact info just let me know.
Thanks,
lee

Posted on Jun 25, 2008

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Check down the thermal fuse...
only that object can turn off the tv by its own..

Posted on Jun 25, 2008

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So you press the power button, the whole tv turns on and then 5 seconds later everything turns off, correct? If not, please explain with more detail. Also does the power button flash at all. Do you have audio and video for the 5 seconds. Please let me know so I can narrow down this problem

Posted on Jun 25, 2008

  • Benjamin Patri
    Benjamin Patri Jun 25, 2008

    Does the power button start to blink or change colors?

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Mitsubishi WS-65511 Rear Projection Big Box TV resets with a green flashing light every 5 minutes, Then works fine for 5 more minutes (perfect picture). Acts up worse when cold. Warm it up Works hours It's NOT the DM board caps. I've already replaced the DM caps twice. Not the problem. No repairman will look at the set. Too Old. So am I. I could repair it with help. The power supply must have a safety circuit that will shut down & reset if too much draw. I DON'T have a diagram. I'm not sure how to trace it . Which board? If I unplug boards one at a time, Will it damage other boards ? I know it is NOT the 7 DM board caps everyone keeps telling me. I see no burn't parts, No bulging caps. Tapping on components doesn't reset. What kind of component would act up when cold , But not overdraw when warm? This set has the best beautiful picture when it runs. If you can get past the resetting every 5 minutes for the first hour, You can watch it sometimes for 20 hours. I've left it on at night & it is still on the next morning. Change the channel Or raise the volume, And off it goes. Once or 10 times, Keeps resetting. Then on for 4 or more hours, Maybe. I can't afford a new one. It works GREAT ! when it works. I've notice that even when the set is turned off, The green light starts flashing (resetting itself while it's off) , Then stops. Once in a hundred times it will kick off the breaker & you need to push reset with a pin on the front panel next to the green light. It's probably a 10 cent resistor OR a $ 1.00 cap. If I only had someone with more knowledge than me to help. I know how to use a meter & read a schematic. I built a Heathkit 25"TV in the 70's & all my novice ham gear. I'm 64 & not familiar with digital circuits. Can someone help PLEASE ?

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