Question about Televison & Video
I own a sony (1991) KV-20TS27 color TV and the problem it has is that once you turn it on the screen just displays snow instead of the usual channel selection. I tried switching the A/V option on the remote control, but it doesn't do anything.I do have a background in electronics.Do you have any idea or suggestions to correct the problem? Thanks.
Either that of your tuner block is acting up. Most Sonys of this production year uses a tuner block that requires 33VDC tuning supply. It has been known for this zener to fail or the capacitor parallel to it. At times, it could just be the tuner block itself.
Should you venture a DIY, it would be to your advantage to have access to a service manual or at the very least a schematic diagram with voltage readings.. It further requires familiarity with electronic components and circuitry, use of a DVM and a soldering iron. Should you be uncomfortable going this route, then perhaps your best bet would be to seek the services of a qualified professional
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on May 11, 2008
SOURCE: No freeview bbc channels
just solved the problem
with the variable attenator fitted i did a rescan still didnt work
but when i did a rescan to the restore factory settings it now works
Posted on Jan 13, 2009
After much trial and error, we discovered a temporary fix. We taped a 3 x 5 index card to the front of the box directly to the right of the time/ channel number. The remote will change both the channels and the sound level with this "fix." Could there be some kind of emission coming from the box that interferes with the remote? Maybe Motorola could put a more opaque front on the box.
Posted on Jan 22, 2009
Lets check the modulator set up at the main location TV 1. Press menu - 6-1-5 this will display how the TV 2 IS SET UP. It should say 22 air and if not use the arrow keys on the remote to change that info. Once you are done click done and go to the TV2 and see if it is working. It should be if you are set to view air or antenna channels on the TV2. If not there needs to be a few more things done to isolate the issue. Let me know and we will go from there. Thhanks for using Fix Ya.
Posted on Apr 13, 2009
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You have a problem with the three factors, and they are screen voltage, focus voltage, and control (focus 2) voltage. Basically these voltages have to be adjusted since the components in this section have aged some. These controls are usually located in the television on the IHVT (Integrated High Voltage Transformer) or as it is also called the flyback transformer. these controls must be adjusted together, along with the color controls. Here is how the adjustment is done (You will need a schematic diagram, a DC volt meter, and a color bar generator to do these measurments):
1) turn color and tint fully counter clockwise until you have a black and white picture.
2) connect the color bar generator to the TV (ch 3) and turn it on, you should see bars in various shades of gray
3) adjust as best as possible the color and tint controls to obtain the color bars on the screen Red Green Blue.
4) measure the voltages on the focus, screen and control grids of the CRT and match them to the schematic digram measurements.
5) adjust the focus screen and control grids to match the ones on the schematic diagram
6) once this is done then you adjust the color controls once again to obtain the red green and blue bars on the TV screen.
This should help if the CRT (picture tube) electron guns are still good and if the flyback transformer voltage supply is working.
However if you do not have a background in electronics please take the TV to a shop for repairs.
I hope this helps,
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