Mitsubishi WS-55311 55 in. Rear Projection light terns on then terns back off

Http://www.download-service-manuals.com/manual.php?file=Mitsubishi-1343.pdf

above is your service and repair manual, below is your owners manual.

http://www.retrevo.com/support/Mitsubishi-WS-55311-TVs-manual/id/276ci866/t/2/

OK well what has happened i suspect, is that your set has been "Spiked" from a power disturbance, and this has damaged either the PSU, or an internal high voltage component, or both, and now, the Protection Circuitry in the SMPS unit, is "Sensing" a potential "Catastrophic fault", that may cause a fire an explosion or both, and accordingly the set MUST be shut down, so the protection circuitry does exactly that.
Your best bet, is to contact a local or head office of the TV's manufacturer, and ask them for a referral to an authorised servicing center. When contact is made with them, ask for a "Quote" for the repair, before allowing any repair work to be undertaken. This then at least will give you an idea as to costings and you can then make an informed decision as to repair or replace, as often these days i find in my shop anyway, many repairs can be very expensive, and often it would be better putting any monies that would have been spent on repair towards a NEW unit with a warranty.

However if you really wish to DIY, then I have supplied the service manual, so you can begin troubleshooting, as usual always start at the Power supply and check voltages here first as if the voltages aren't correct here, then nowhere else can be...follow any potential incorrect voltage to it's fault.

Hi,
I've read your comment and the blinks error code you've posted indicated of short protect circuit. The problem is, lot of parts are going to check for shorts. Common caused of shorted parts are the output voltage regulator transistor/IC and the zener diode in the output of the power supply section. You must know how to test this parts using the ohmmeter to isolate the faulty one. Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.