Your description of this problem to another poster describes my issue exactly and I described this to the Philips Customer Service support folks even describing what I thought to be a heat problem, they offered no assistance. Questions - 1) is this a fairly easy fix, I have some technical experience with electronics?; 2) do you know where I can get a service manual to help with this fix?; 3) where can I purchase these parts?
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Re: TV loses video and sound
Check the firmware on the set and if is is not BX23U-188.8.131.52_03531 go to www.usasupport.com to down load the currect version. That should fix the problem. If it does not your small signal board need to be replace.
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If using 3 color RCA (r/w/y) the red and white is audio and should go into your stereo under video or AUX. The yellow is the only video cable you need, that should go to your TV aux in or video1 or video2. You can also put all 3 colors into the tv and then run another red/white OUT to the stereo AUX in and have stereo sound for whatever you are watching.
If you can describe it more then maybe the following may assist....
There are several types of plugs and sockets on TV receivers for many applications....A SCART type has many pins for the sound and Video outputs to various type of CD, Video, or surround sound systems, or games consoles.
There are also systems that supply a DC voltage over these various type of plugs and sockets to "drive" the input electronics at the far end of the TV receiver....A classic example is for a mast head amplifier which needs a DC voltage to make the Amplifier work and this is done over the TV areial connection so maybe this is what you are describing....More detail please...