There is a component that has become thermo sensitive with age. When the
set is cold, it is performing near to spec, and when warm it is changing
value. Electrolytic capacitors are known for this type of fault.

By taking readings of the biases to the CRT elements, and of the main power
supply outputs, a determination of the area of failure may be easily
determined. Also, looking at the amplitude of the video signal to the CRT
elements from the video amps (RGB), may also give some clue. Once you know
the area that is causing the failure, then you can go on to troubleshooting
for the defective parts.

Once you know where you are going, you can use some freeze spray and a heat
gun to cool and reheat the suspect components to test them. When you get
the right one, you will be able to make the effect by cooling and heating
the parts. It is very possible that you will find a number of parts that
are defecting with this approach.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"ND" wrote in message
om...
Hi,
I have a 27 inch Panasonic, PIP tv(around 9 years old). Here is the problem
This was some time back, When I turn on the TV, picture comes up but
in 5-10 seconds slowly fades away till there is blank screen, the sound is
fine.
Now if I turn off the TV and turn it back on the picture doesn't come. If I
keep the TV
plugged out for a long time and try it again the above behaviour is
repeated(picture comes up and fades out).
This has gotten worse and worse, and now when I turn on the TV even after
keeping it plugged out for a long time, the picture does not come up.
I dont know much about TVs but I after reading some of the posts on this
newsgroup, I opened up the TV to check two things, to see if there are bad
solders at the board that hooks up with CRT and to see if I turn on the TV,
at the end of CRT if I see orange glows. The solders look ok to me but when
the
TV is on, I dont see any glows in the glass tube at the end of CRT.
What could be the problem ? Is there anything I can do to repair this TV.
Thanks in advance for your help.

-ND