I have a 53swx12b and it won't turn off. When you hit the power button on the remote or front panel the electronics all turn off but it seems like the TV part doesn't. It's done this once in the past but stopped for a few months and now it's doing it again. I can tell the TV is still powered up because I have it plugged in to a high end UPS and power usage display doesn't drop when I turn the TV off. I found some another article that leads me to think it's the power relay but I just wanted to get some other opinions. Of course it's just out of extended warranty.
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Re: TV won't turn off
Actually i just had a hitachi 2 weeks ago that would also not shut off. a called hitachi and was told to first do a master rest wich did not work, then they told me to replace the relay, once i replaced it the tv works normal again. i gently dissambled the relay & found the main contacts stuck together like they were welded.
so replacing the relay is a good place to start.
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• Press the TV button or ON/OFF button while remote is in TV mode and there's a source of power to the outlet or outlet strip. • Make sure the TV is plugged in. • You might have tried to turn on the TV during the lamp cool-down. Wait a few moments and the picture will appear. • Has the power light on the front of the TV been blinking for one minute? If so, the lamp may be dead. Refer to the Power indicator is blinking or flashing section below for more information. • When you first plug your TV into an outlet, the Power indicator on the front panel will light and blink for approximately 30 seconds and then go off during the initialization of the TV. This happens only when the TV is unplugged and plugged back in. The TV can only be turned on after the Power indicator goes off. • Check the wall receptacle (or extension cord) to make sure it is "live" by plugging in something else, such as a lamp. • Something might be wrong with your remote control. Press the POWER button on the front of the TV. If the TV turns on, check the remote control solutions on page 53. • Multiple TV Setup might be set to the wrong option. Press MENU/OK on the front panel. Select Setup Options, then Advanced Options, then Multiple TV Setup. Choose TV (default).
This is called the blinking green light of death-----only one of two things can cause this problem.
First: remove front speaker grill (IT PULLS OFF) AND remove inspection plate behind it; look for the two bundles of wires coming down and to the right from the front keyboard of the set.
Unplug both plugs you find (different and marked so you cannot mix them up-----the idea is to take the front keyboard out of circuit-----set will still function with remote as receiver is behind front screen)
Try (after 70 seconds) to turn on with remote
If it comes on---defective reset button on front keyboard----use set only with remote or remove and remove actual reset switch---it is located behind and part of frame for screen----entire front screen would have to be removed to get at it.
Second: if disconnection of the front keyboard does not help, the DM unit is bad.
As you look from back of set it is large metal box at extreme left side.
The blinking light is the unit trying to "Boot" up-----these have a problem where caps and a few other parts in that unit fail-----kits on the net are available----Mitsubishi no longer sells or services these units but PTS Electronics does repair them.
Let me know if you have questions and try disconnection of the front keyboard FIRST.
First press on the power button on the tv remote control. if it is also not solved then i think your tv has a internal hardware problem which may be failure of some electronic components. It will be better to take it to nearest service center
Unplug,replug the tv back like 24 hrs later.That the whole tv is resetting itself everythings.Tv now should be working again.If still have the same problems,than ur tv DM power supply board is have dying parts,must repair the tv DM power supply board to fix the tv.
a code will always read 12-normal if you just plugged the tv in. it has to try to turn on then shut itself down to log a code. Or shutdown is caused by something the tv cannot detect . Or a front panel button has failed- does the green light turn on for a second when you hit the power button on the remote? if not try unplugging the front keypad behind the speaker cover.
um . that model doesn't have a reset button . but if no lights on front of the set even blink when you press the power button on the front or on the remote .then suspect front panel buttons ,with that model.
if the remote eye on the tv it will do all kinds of strange stuff once the eye on tv gets dirty the the tv will shut off after 2 seconds try cleaning it and see what happens the eye on tv is hard toget to so get a can of air to blow it out i took my pocket knife to clean mine i know that was ruff on eye but thats all i had if this dont work try unpluging your control board on front of set board may be bad or buttons are stuck email me at email@example.com if this helps
"...it's possible that one of the front panel buttons is "stuck" or shorted, and this could cause the TV to ignore commands from the front panel or remote. But this should also cause the Power command to be ignored, too. You might try pulling off the front panel and disconnecting the front panel buttons and then see if the remote works."
This model has had problems with the keyboard buttons on the front panel,causing them not to work and canceling out the remote operation.
To verify this,you need to remove the front panel so you can access the connector on the keyboard pc board and unplug the connector.After doing this,see if the remote control is able to turn on the tv (wait for it to power up because with the connector off, the green power light will be disconnected and will not light up when the tv is on) If the tv works, than you will need to change the ten individual switches on the board - part# 432P089010 (or just use the remote only)