Thats usually an issue with the vertical output IC which will prevent the picture tubes from lighting and the set will throw the error code for berticla protection. Replacing the vertical out IC should solve the issue in most cases. Your model uses the TDA8177 its at IC4B01 board location shown belo. and you can get one at the following link http://tvrepairworld.com/vertical_output_ics
The illustration below shows where its at indicated by the red rectangle 
SOURCE: What do I need to
I had three tv's VS-50607,VS-50605, same problem.I called Mitsubishi and got no help.Took me two years to find because the sets were not acting up when I was there.Last set was out completly with 2-4 code. Found problem to be cold solder connection of DY (Yokes) on vertical .I bent the tip on my Weller gun and used a mirror and soldered. It was a sure repair.I went back to the first set,and soldered and it repaired it!,The second set got junked out before I could get to it.
SOURCE: MITSUBISHI WT-A42 ERROR CODE 22 "SHORT PROTECT CIRCUIT"
error code 22 is a short protect circuit. this means the tv has found a
problem in the tv and will not let it turn on till fixed. this could
be several different circuits in the tv that is causing this. we need
to test some parts to see what this is. the most common is a shorted
convergence circuit. a repair on this would range around 400.00. You should check using a multimeter and also you should be good at soldering
PS:I strongly advice if you don't have experience in electronics then better leave this job to a tech
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