Question about Mitsubishi WS-55315 55" Rear Projection HDTV-Ready Television

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I have a LTP227WX/XAA Samsung LCD TV that will not boot up. I get a red flashing light & chime, but nothing else. I have unplugged for 20 minutes to reset, but no change. I assume there might be a power supply problem, but am not sure. I have done some electronic repair and have a DVM. Any suggestions on how to isolate problem and repair details would be appreciated.

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  • Anonymous Dec 13, 2008

    I have same problem - noticed after a power flicker to the house. Something is blown in the start up circuit. It trips an auto shut down circuit when trying to boot up. If I unplug the power to the monitor and then hold the power button down while plugging power cord back in, I can get the unit to cycle with first the OFF and then the ON chime. The monitor still finishes in the off state but without having tripped the auto shut down circuit. In this case, the small red light indicating that power is still on to the unit stays on. Leaving the unit in this state for about 4 hours seemed to allow for some capacitor to soak such that it would boot up as normal. This technique worked for a few weeks. Eventually, it required an overnight soak time of 12 hours. A few weeks later, no amount of soak time in the red light on state works.

    It probably only take a $2 chip or a $50 circuit board to fix this problem, but try to find one.


  • sfot Jan 15, 2009

    Same symptoms although I notice that when it tries to power up there is a brief flicker of the backlight(not noticeable except in low light or very close to screen) I had this problem before and it temporarily disappeared for a few months on it's own. Then returned. It has been months since I tried to power the unit on(it was packed and ready to ship somewhere for repairs...but I never got around to it) I will try the first solution offered about the capacitors in the power supply.TIA if that works!

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Upon looking into this series of power supply. The final filtering caps appear to be underrated.

There are 3 1000µF @ 35WVDC, these are very noticeable as being
expanded and blown.

Simple replacement by common accepted practices is in order, after unplugging the unit from A/C power cord.

Separate the case halves gently with an old credit card or edge of a bad CD as not to scratch the side and gently pry the halves apart.

Removal of the 2 screws on the back behind base is the final step.


Replace these items with a higher rated capacitor.

Use 1000µF @ 50WVDC. Replace all three at the same time.

Reassemble in reverse order.

Enjoy.

Posted on Jan 07, 2009

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