Since a PIP set has two tuners it sounds like the chroma circuit on one tuner is shot. Now this fortunately is a less expensive repair. If the set is fine otherwise then go for the repair but first get an estimate. It will be cheaper than a plasma flat screen of similar size.
A reputable repair shop should charge no more than $300 (should be less) MAX for this repair.
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You have a bad video board. If you can find one used it is fairly easy to replace once you get into the TV itself. Your color guns could also be adding to this problem. I am not familiar with this television and its components so I dont know if you can replace one color gun at a time or if once one is shot then all three have to be replaced. That should be a start for you anyway.
OK this problem is caused by a failing electrolytic capacitor back in the power supply. It's job is to filter AC interfence from that voltage source. Locating the correct capacitor is something not for a do-it-yourselfer. A respectable tv shop experienced with Mitsubishi tv's can usually repair this problem in your home. Average repair cost would be between $200 and $300.
It sounds like you have bad solder joints in the tv. If you resolder the boards in the tv, it sounds like it will be fine. When you are slapping the tv, it is temproarly making contact again and fixing the picture..
For my VS-45607 I had to first take off the speaker grill. Then there is a panel just below the screen that can be removed with screws; I removed this just for wire clearance. Then there are a few screws that are along the bottom of the screen that you take off and you should be able to slide the screen up and off. Good luck.
Oh good, two people. I was getting weary of attempting to slightly change my answer for all the other people who didn't use the "has the same problem" feature. Anyway, the problem both of you have is not too far gone yet, but will get worse if you let it. It's the main capacitors. Maybe not all 21, but probably at least half of the 21 main caps are shot. All should be replaced at any rate. Any shop worth it's salt ought to be able to do this for you for under $400 if you can't do this yourself.
If the source to the PIP input is a color signal then the PIP display will be color. PIP sets have two video sources one goes to the main screen while the other goes to the PIP. it all depends on what the format of the signal is being sent to each input. This is quite normal.
It could be a bad solder connection that opens up as the set warms up. It could also be caused by a couple of bad capacitors, C2p05 (100uf/16v) Located By Ic2p01 and check C2c52 (10uf/50v) Located near Q2c51. A technican will be able to fix it for about what you paid for it I suppose.