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How does the Toshiba get the "TV" signal?

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Joe Murphy Jr

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In Reply to: Problem with TV Audio - Toshiba TV posted by BKheel on June 02, 2004 at 22:00:36:

Is it via the coax (RF) input from an over-the-air (OTA) antenna, cable box or satellite box?
My guess is that it could either be the demodulator in the Toshiba if you're using any of these three sources or it could be the modulator in the cable box or the satellite box if you're using one of these two sources.
If you have a recorder before the Toshiba's coax (RF) input, you'd then have to consider its demodulator and modulator as possible culprits.

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Re: Now that I've eliminated the VCR as the problem - Brian Kheel 12:32:06 06/06/04 (4)
I took the VCR feeding TV input out of the path. It made no difference.
Why is there be a problem with the sound through the TV input but the sound through the 2 video inputs is fine?
- I re-read your post. - Joe Murphy Jr 17:14:15 06/06/04 (1)
  Here's my best guess:
  The demodulator and/or resistors/capacitors directly after it on the circuit board in the Toshiba TV are bad. The RCA inputs on the TV are separate from the coax (RF) input on the TV, which has to be demodulated (decoded, if you will), and that's why they work while the coax (RF) path is giving you a problem.
  The TV's demodulator probably needs to be removed and replaced. Usually the coax (RF) input and the demodulator are together as one piece (the threaded part leads to a very small silver "box" on a circuit board inside the TV).
  You might be able to find Toshiba demodulators at markertek.com, partsexpress.com or mcmelectronics.com, if you want to do it yourself. If it ends up being resistors/capacitors as well, they'll also have to be replaced. If you are adept at soldering and electronics work, this should be easy. If not, I'd let a TV technician do it (I'd estimate this repair to cost around $50 - $100, depending on how much they want to screw you).
  - Re: Thanks Joe - Brian Kheel 23:54:50 06/06/04 (0)
    It's probably worth my having the work done.
    Brian
- Which TV input? - Joe Murphy Jr 15:27:51 06/06/04 (1)
  The coax (RF) input or an RCA audio/video input on the TV?
  - Re: Which TV input? - Brian Kheel 15:56:57 06/06/04 (0)
    The TV input (the one with no sound) and the video 2 (to PIP) are both fed by coax. The video 2 from the DVD player gets the picture from an S video feed and the sound from RCA plug connections.
Re: How does the Toshiba get the "TV" signal? - Brian Kheel 07:01:50 06/04/04 (1)
The signal is from a cable company. I split it into 2 paths which feed a switcher. One of the paths has the cable channel selector box and the other is a direct feed.
The path with the cable box feeds through one VCR (#2) to video 2.
The direct feed path feeds the TV input through the VCR (#1) that's attached to the stereo system. When everything was working right, I could tape a program with this VCR while watching another (using the TV tuner).
Thus, in total, I could be taping 2 programs and watching a third. Now, since I'm dependent on VCR #1 to provide the audio to the stereo, I can't watch a separate program.
I'll remove VCR #1 from the path to see if it's the VCR that's the problem. But if it is the problem, wouldn't that also prevent the audio from passing through it to the stereo system?
- No, it's two separate paths. - Joe Murphy Jr 18:53:25 06/04/04 (0)
  The VCR demodulates the incoming RF (cable) signal. Once "decoded" in the VCR, there are two output paths available: video and audio via the RCA outputs -- if you have an S-VHS deck, video can be output via the S-video connector -- and a modulated (combined) audio/video output via the coax (RF) output.
  One path can go bad and not affect the other.

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