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Unplug it ,take the back off, look at the fuse,if open,replace it with same amperage,check the IC,s. To do this you will need a ohm meter, depending on the age of the tv, I might look into geting a replacement,also check all capacitors for swolen or puffed up,leaking parts,when replaceing certain parts,take note of how they came out - + hope this helps...
Try this: unplug the set and wait about 10 or 20 minutes. This is to make sure that the main power supply filter caps completely discharge. Look on the power supply board, close to where the AC cord attaches to the board. Look for a white resistor labeled "0.1 OHM" (the symbol for OHM, like an upside-down U) and measure it with your ohm meter. If it is open then your switching transistors in the main power supply are most certainly shorted. Older sets had 2 separate transistors on little heat sinks labeled "C4834", then they switched to 2 transistors in one package labeled "MX0841" or "MX0842", and then some sets went to two separate MOSFET transistors. Measure those parts and post your results and we will guide you from there.
This is normaly due to the focus bias volts being out of spec, and slowly drifting in to specs. This type of fault is usualy in the high voltage multiplier section that supplies the focus voltage, or in the focus circuit on the the CRT circuit board.
There is also a possiblity that the CRT is going weak, and it is taking some time for its emission to come up.
The TV service tech can do some tests to determine whre the fault actualy is.
Depending on the age, manufacture, and model of the set, would determine the price and availability for parts. If the CRT is the fault, then the set would not be worth to service.
as you are not a technical person get it fixed by a skilled man.
it is a simple job of hardly 30 minutes.
new switch is available at low cost.
it can be connected directly if you do not want to change switch.
please do not not open back cover unless plug is out as high voltage is input to switch
Many of the later model Sony TV?s have a built in self-diagnosis function. AKB circuit (automatic kine bias), the timer/standby indicator blinks 5 times for about 30 seconds then goes to the self-diagnosis function. In other words, the IC chips on the Cboard are burned out. This repair is not one that should be attempted by the end user. This repair will need special test equipment. You will need to take it in for repair. It shouldn't cost more than $170-$200. This is cheaper than a new TV set.