Problem with panasonic tx-w28r3

My Panasonic TX-W28R3 has some fault. When I switch it on the sound comes on, but not the picture. After more than half an hour the picture comes on, and everything works fine.

btw, this problem was less bad at first, only had to wait 5 minutes, but got worse progressively.

Can speed it up by changing channels quickly, useually starts when it hits the snowy channels (where the is no signal) probably some voltage spike gives the warm-up circuit the needed push.

Was told once a resistor may have increased in value, thereby changing the threshhold for picture switch on, but other than checking any resistor on the board (might take 10 years) what can I do?

btw, I am an aspiring tv fixer, so hopefully will learn things from the effort of locating this resistor. Anyone had this problem? probably a design fault - resistors should go just like that, they should last for 100 years.

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It sounds like there are some parts in the set that are becoming thermo sensitive from age and use. It is really impossible to guess at which ones, since many of the critical components in the scan amplifiers and power sections can do this type failure. Most of the time electrolytic capacitors tend to become thermo sensitive with age and use.

An experienced tech can troubleshoot the set to determine the exact failed components, and then replace them for you.

Jerry G.

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Jerry G.

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