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Andy: Thomson TTT 00-001
CTC 195/197/203 No or weak audio via tuner mode, line inputs not affected. U16201 # 49 should read Apx 3.9 VDC (u12101 in 203 chassis) If this ckt is not working that voltage will aproack 7 VDC C12304 off # 3 of L12303 near Pin # 1 of that ic CR12301 off # 1 of L12303. Both surface mount components. hope this helps. "Andy Cuffe" wrote in message ... I have two RCA CTC197 sets with the complaint of no audio. The first one seemed fine, but I resoldered the audio and tuner areas just to be safe. It came back with the same complaint. I've had both sets running all day for a week with no trouble (both tuner and A/V inputs). Are there any known problems that can cause intermittent loss of audio on these sets? I found this on Google which sounds like my problem. Is there a fix for this problem? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^ Here is what you need to try first. Unplug the tv for 1/2 and hour then plug it in and reprogram it completely. If the sound comes back on it is not realy a tv defect per Thomson. The Tv-guide plus is receiving a code from the tv stations when they go to commercial which is causing it to lock out the audio, unplugging the tv will reinitialize the audio. Yes it is a nuisance, but several tv stations have just started sending out codes on the same info line as the tv-guide plus. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^ Andy Cuffe |
I posted the same basic question about a month ago concerning the CTC203 with
no responses, but I've also had several CTC197s. Either the speakers are shut off, or no problem found on probably 20 in just the last year. I haven't figured anything out. Ron |
On Wed, 17 Nov 2004 20:21:40 -0500, Andy Cuffe
wrote: I have two RCA CTC197 sets with the complaint of no audio. The first one seemed fine, but I resoldered the audio and tuner areas just to be safe. It came back with the same complaint. I've had both sets running all day for a week with no trouble (both tuner and A/V inputs). Are there any known problems that can cause intermittent loss of audio on these sets? I found this on Google which sounds like my problem. Is there a fix for this problem? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^ Here is what you need to try first. Unplug the tv for 1/2 and hour then plug it in and reprogram it completely. If the sound comes back on it is not realy a tv defect per Thomson. The Tv-guide plus is receiving a code from the tv stations when they go to commercial which is causing it to lock out the audio, unplugging the tv will reinitialize the audio. Yes it is a nuisance, but several tv stations have just started sending out codes on the same info line as the tv-guide plus. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^ Andy Cuffe This is true, also make sure the mute circuit isn't prematurely muting audio. Cheers, Wizard |
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Do these have the early versions of the Gemstar 4 module? If so
certain codes certain tv stations send out turns off the audio, tv has to be unplugged to fix. There has been a class action lawsuit against Thomson over this one. That chassis also will turn off the audio outputs if it sees any kind of dc detect on the speaker line. Make sure it is not borderline. Plus the myriad of problems on the clock and data can cause this symptom. Especially conductive glue under certain surface mount components on the clock and data lines. This type of problem almost guarantees the need for a 4 channel or more digital storage oscilloscope. Thomson's ctc195 and later chassis' was the reason we had to upgrade our equipment. David Andy Cuffe wrote in message . .. On Thu, 18 Nov 2004 02:26:22 GMT, (Jason D.) wrote: This is true, also make sure the mute circuit isn't prematurely muting audio. Cheers, Wizard How do I determine if this is the problem? I have yet to see either set act up. Andy Cuffe |
Thomson TTT-00-001
CTC-195/197/203 No Audio in tuner modes, Line inputs may work ok 195/197 Check # 49 of U16201 should be apx 3.9 VDC, 203 # 49 of U12101. Not functioning voltage aproaches 7 VDC 195/197 check C12304, 203 C12309 for open, # 3 of L12303 near # 1 of U16201 / U12101 in 203 chassis Also CR12301 # 1 of L12303 All in FM detector ckt. BTW no antennea or cable to the set audio noise may be present, once antennea or cable connected, may mute or go to a very low level. "David" wrote in message om... Do these have the early versions of the Gemstar 4 module? If so certain codes certain tv stations send out turns off the audio, tv has to be unplugged to fix. There has been a class action lawsuit against Thomson over this one. That chassis also will turn off the audio outputs if it sees any kind of dc detect on the speaker line. Make sure it is not borderline. Plus the myriad of problems on the clock and data can cause this symptom. Especially conductive glue under certain surface mount components on the clock and data lines. This type of problem almost guarantees the need for a 4 channel or more digital storage oscilloscope. Thomson's ctc195 and later chassis' was the reason we had to upgrade our equipment. David Andy Cuffe wrote in message . .. On Thu, 18 Nov 2004 02:26:22 GMT, (Jason D.) wrote: This is true, also make sure the mute circuit isn't prematurely muting audio. Cheers, Wizard How do I determine if this is the problem? I have yet to see either set act up. Andy Cuffe |
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