It needs to be serviced by a repair man. Momst TV repair shops don't charge to look at it. Find one that does not change a fee to look at it and find out if it can be fixed. Always good to get TVs checked out just to be sure.
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If this is a crt type television. YOur vertical IC loose connection with the board this commonly happens to vertical ic. Resolder or reflux it with a new lead. It is worth fixing, minor repair almost no component to be replace.
It is possible that the flyback transformer and the horizontal output transistor have failed. Also there may be damage in the power supply when these components fail.
When troubleshooting, it is important that the tech locate the cause of the fault and also change the related components.
After the parts are changed, the power supply and the high voltage setups must be done to make sure that the voltages are in specs.
This type of work must be done by an experienced TV tech. He will have the necessary test equipment, tools, service manuals, and training. There are some very serious safety issues when working in a TV set.
Panasonic changes the complete power supply for the fix.
If you want to change descrete parts, find out the cause of the failure and fix the cause before applying back the power. This is also valid when changing a complete board. A short or defect somewhere else will cause the failure to occure again!
From your description it seems that when the high voltage comes up there is a fault detected by the uPC, and the power supply is put in to the protect mode. This can be from many problems such as the flyback transformer failing, or a defective component(s) in the secondary supply from the flyback, or the CRT itself having a failure.
On many of these sets, there is an HV multiplier that is part of the flyback assembly. This HV multiplier is usually where the fault occures more so than the internal windings of the flyback. But, they come as one molded assembly.
Most often, I have seen this fault from the flyback transformer or the CRT.
This has nothing to do with anything you connected to the set. This problem would have occured anyways.
Most of the time, this is a failure in the horizontal output stage. This can be the flyback, the output transistor, or driver transistor, the driver transformer, and also some of the capacitors. Other areas of failure can also be in the power supply itself.
Sometimes the CRT can have an internal short in the electron-gun assembly, and cause these types of failures.
The cost of repair for your set may be a little on the expensive side. Considering the age of this model, it would be more feasible to replace it with a new set.
With the set being 12 years old, I'm sure the picture tube is near the end of its useful life. You probably have a defective semiconductor, either an IC or transistor that has gone up giving you no color, but with the green picture, it is not likely worth repair.