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Re: no sound or picture
1)Check for CRT coolant leak on main PCB's.
2)Check any/all fuse devices.
3)Measure power supply source voltages.
4)PVAT! Pull chassis--look carefully for bad
solder connects,esp. regulators.
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I have Mitsubishi TV CS-31303. It has transient issues. At turn on, it shows horizontal fringes for some time along with picture, then single horizontal line only and then after some time finges at the 1/3rd bottom and then clear full picture. After some more time the clear picture turns into horizontal fringes at the bottom 3rd of the picture and picture rolls and then again the picture is very clear. Some one said that there is an issue in the signal PCB. Where is it and what componets are at fault. I do have service manual which shows circuit diagrams.
problem is caused by the loss of horizontal deflection signal. It is quite surprising that the entire unit is still working, since usually, a loss of H-Out will disable the entire set. Problem can be as simple as loose solder connection to a more complicated defective horizontal circuit. I would suggest havint it checked by a professional TV tech.