Question about Sony KV-36XBR450 36" TV

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Red Colour is faded....looks almost purple?

I have been using my TV for 6-7 years with a Bell Satellite ExpressVu system. The TV is ALWAYS on.....I just turn off the satellite receiver and the screen goes dark.
After many years, I now have a faded red colour, not a deep rich red....it's almost purple? or Crimson.
There is not a Red, Green, Blue separate colour adjustment....only the on-screen adjustments.....they don't seem to fix the problem.
I'm not sure what to do? The TV weighs 235 lbs so it's not easy to take to the shop for a test/assessment. Is there a test I can do? Some standard RBG signal to check the colours?
Thanks for any help

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This might be caused by the CRT or by the chroma circuitry. You will need a schematic diagram and a multimeter set to read voltage. The first thing would be to look at the voltages on the CRT socket. With the TV on and the back off, using the schematic measure the voltages on the CRT socket and see if they match the schematic, if they do not (and they wont) find out if the Red Cathode voltage is too high of to low. If too high the red video circuitry might be at fault if too low the CRT might have a Cathode to grid short. In either case power down the TV and with determine if the CRT is bad (using a CRT Tester / Rejuvenator) Run a series of test acording to the instructions of the CRT Tester. This will tell you if the CRT is bad and if it is bad what problem it actually has. Then you may or may not have to rejuvenate the CRT (follow the instruction on the Tester / Rejuvenator) to do this. If the CRT is not bad then you will have to test the chroma video circuitry to see which component is causing the problem.

As you see you will need some equipment to do the job with. and you will have to have a little bit of an electronics background, If you do not have these I would suggest that you take the TV to a qualified TV repair shop for servicing.

I hope this helps,
Thank you,
Shuttle83 

Posted on Oct 31, 2007

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