Same problem and Just had repair man out. Said it was the signal board and that with this model it is a very common problem. Mitsubishi no longer makes the parts to fix it. If you want to scout online for one th product number for a signal board is 930b868003
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your set is the V17 series so a code 22 means short protect. Which means the TV has a short circuit condition and is shutting down to prevent further damage. You can get a manual for the V17 sereis at the following link for 15.99 and they will provide free unlimited support to help you with the diagnosis and locating parts. Your set is coverd in the V17 sereis service manual under the mitsubishi section. Here is the link in case youd like the service manual and free support. http://servicemanuals.vstore.ca/
This set has a problem in the horizontal sweep circuit or in the main power supply. Most likely a failed component, and the set shut down to protect the rest of the circuit. If you know how to read a schematic diagram and how the circuits operate, then you will need a good multimeter and an ESR type capacitor checker to find out the short in this set. Sometimes the CRTs(Picture Tubes) will leak the coolent fluid out and onto the printed circuit boards. Also sometimes the convergence IC's can cause this problem, but if that is the case the small little pico fuses will pop also. If you have had no solid state or printed circuit repair experience, play it safe and call in a trained tech. Good Luck