Mitsubishi ws-55515 light blinking

Sounds like the blinking green light of death issue. This is common on this model. You can get more info and a repair kit from www.TvRepairKits.com

Find the button said inputs in ur remote control,press that button,will see inputs like 1,2,3.Ur Xbox 360 video/audio should be in one of those inputs.

This unit s common problem is a fluid leak on the chasey from one or more of the tubes it leaks on the chasey maybe only one or two drops but after a period of time it causes a corrosion on the chasey and things like this happen you have to get a lamp or flash light and look in the tv to see if this is happening be surre to unplug tv

There are (4) 1000uf @35V capacitors all together on the DM board that need to be replaced some models have 1000uf @ 16V but they are all right beside each other and all rated at 1000ufs the voltages will be stamped on the capacitor along with the uf ratings.

if the set is shutting down it should blink a code. Try pushing in the menu and input buttons on the set both at the same time and hold them in for 8 seconds to see if the self diagnosis will falsh a two digit code. Let me know what happens

You will need to reset the Netcommand and tuner settings in the set.
The little indented button in the front of the set needs to be pushed in (when the set is off). The front light will blink for about a minute or minute and a half.
Then, reprogram the Netcommand settings.
This should solve your problem.
If you need more information, then, reply to this post and I will respond.

Sounds like your control unit has going down. its the big silver box in the rear to the left of the set.

Missing voltage = open fuse in power supply?? soldered-in
pico fuse?
Does light blink continuos up front?
Can you hit power again with same result or must unplug/plug
AC cord??

Check any/all fuse devices in power supply.Let me know.....T.
By the way,the tv serial # is 107543. I assume the model # is
as stated==WS-55859.

First check set for problems by:This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. Self-diagnosis error 2-3 indicating deflection failure. Check for shorted or leaky Q5A37 part # 260P818050 located on PCB-Main. If found defective replace only the transistor instead of the Main PCB.