Question about Sony FD Trinitron WEGA KV-27FS100 27" TV
Hey experts -- my TV is having some audio issues. From normal cable via coax,TV volume has to be increased to full to hear even the slightest bit of audio. When using the DVD player through a standard Red/White/Yello RCA cord, volume works fine. Any suggestions?
The following pertains to most sets of this type. I am speaking generaly and not model specific.
The fact that you can have sound from a direct baseband source, tells me that the fault is in the sound demodulation areas.
If you can have a cable TV box with A/V output to the TV, then the set would not be dependent on the tuner and sound demodulator. You would also have a nicer cable picture and better sound than what its tuner can do.
Before worrying or going drastic, check that the set is not in the SAP mode. It must be in the MAIN or Stereo mode. You will need the original factory remote to verify this.
In the IF module there is a sound demodulator circuit. If I remember correctly, this set may have another daughter board or another circuit area for the stereo processing.
I have had a number of sets come in for audio failure. In most cases we replaced the IF module to fix the fault. In some cases it is possible to service the module, but this is difficult without having the proper setup to troubleshoot and service it.
After the IF module is replaced, the AGC setup has to be performed. There is reference in the service manual for the setup of the AGC.
You may find it more feasible to have a Sony service tech service the set. This way you don't have to start buying modules and parts to try.
It may be cheaper and better for you to get a cable box for your cable service, and feed the set A/V baseband from the box.
With the advent of the new LCD and Plasma technology, you may want to put the repair cost in to a new and better set!!!
Posted on Apr 13, 2008
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Posted on Jan 02, 2017
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