Question about Sony KV-27V42 27" TV

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No video signal

The video in on my sony TV just quit working. Video from the tuner is just fine, but if I have the input set to video 1 or 2 with a signal on the composite video in, I just get a black screen, though sound works just fine. If I feed the video signal in through the SVideo in, I get black and white video, but no color. It used to work just fine, so I am not just wiring it wrong. ( I have tried three different DVD players and my powerbook in each of video 1 and 2 and SVideo, and the results are always the same).

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Re: No video signal

I have had the input switching IC, and or parts failures in the input amplifiers go defective in these sets.

This can happen from a static electricity discharge while connecting something, or if one of the devices being connected has an electrical leakage and causes some current to come up in to the input of the TV set.

I have also had the input jack assembly go defective and require servicing. This is from one of the jacks breaking and causing an internal short, or if the circuit board became cracked or broken from the TV falling or being roughly handled.

Jerry G.

Posted on Apr 17, 2008

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Why does a Sony Trinitron when on Video 3 works fine with dish. When on channel 3, color goes to b & w, then snaps back to color. on a regular cycle ?

your converter box has a channel generator for the channel #3 and you tv has a tuner set to ch#3 that and a coax wire . every part of that system has to be working correctly to send video ,color,sound if even one part of the system is a little off you run in to problems . most likely your problem is with the converter box channel generator . contrast that to when you get the signal from your video input . with that simple system you just take video from the video board in the box and send it directly into the video board in the tv .....a lot less to go wrong .

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Which external tv tuner will work for SONY kv-xf21m80 model

To by pass the tuner use a cable, satellite or other box that has its own tuner--use the audio/video outputs the box must have and connect to a similar INPUT on the TV---leave set on that input and change channels with the box used.

Dec 23, 2012 | Standard (CRT) Televisions

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Why does my tv show an unsueable signle?

That is the set not seeing signal, Its possible the tuner in the set is bad and first thing is see if a DVD etc connected to a rear audio/video input works---if so with a Cable box connected with audio/video outputs to one of the same kind of inputs on rear of set you can bypass the tuner and get around the problem.

Replacing the tuner if it is bad could be rather expensive.

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Sony KV- 20FV12 get no signal on screen. Same cable outlet works on other TV as a test. Cable ON in menu. Auto Set search produces search but still no signal.


If auto search is going on smoothly, and there is no stations on air is memorized, and display no signal, there are tow possibilities. The first one is antenna is not connected properly. Check the antenna connection for firm. The second one is tuner fault. If the tuner inside the tV is faulty, or it does not gets proper voltage to work, this type of fault land display will see on screen. Check if proper voltages are comming to the tuner section in circuit board. If voltages are ok, and still there is no signal display, just check it with external video input. That is, connect it to any dvd or cd with AV connector, and set the TV to AV mode and play a disc. If there is picture, the video side of your TV is OK. If not, Video-chroma-RF jungle IC is faulty, and not the tuner. OK.

Feb 03, 2011 | Sony KV-20FV12 20" TV

1 Answer

Is my tv digital?

It is not a matter if your TV is compatible with a digital signal, it is the signal being offered to the TV.
Meaning, if you are using Cable TV, you are fine and need no further action because the digital signals are already converted by the Cable Box into either an analog TV (RF) signal, or a PBR (RGB or Comp.Video) signal which the TV understands via a separate input (external video input).

Feb 14, 2009 | Sony FD Trinitron WEGA KV-21CL10 21" TV

1 Answer

20" sony trinitron KV-20fs100 no signal

It is very possible that the tuner and IF modules have failed. On more rare occasions, the supply voltage to these modules may be missing because of failed components in the regulator circuit that feeds the front end area.

Some other areas of failure can be the uPC controler may not be addressing the front end functions, or the input switching control is not working properly.

The mentioned problems would require an experienced TV tech who has the service manuals, and the tools and facilities to troubleshoot and service your set.

If you decide to have the set serviced ask for an estimate. It may be expensive to fix.

Jerry G.

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1 Answer

My sony wega 36' circa 2001 will not receive cable signal.

If none of the r.f. inputs are working and you do not get local channels off of a pair of rabbit ears. You may have a bad tuner. Which you can get replaced for 125.00-150.00 or you could run the cable into a vcr input and use audio/video cables to connect to a video input on the tv and switch tv to that input and run the channels using your vcr. In other words, use your tv as a monitor and use the vcr tuner to pickup basic cable. Hope that takes care of it, Russmann.

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Sound no picture on cable

sweetkiss, if it works through the dvd player and not on cable/satellite box then the tuner is bad, if you have any type of cable/satellite box try running A/V cables out of the box to video input on the back of the tv and switch the tv to that video input, ie; vid 1, vid 2 etc. (your using one of those inputs for the dvd) this will give you your picture back, you can of course also replace the tuner in the set, good luck, BMW Rider

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1 Answer

No picture or sound - think the tuner is bad

You may either have a bad tuner in your TV (not unusual for Sony's) or a broken connection near the tuner on the flimsy circuit boards they're using on this model. The tuner requires about 30 volts DC to work, and this may not be reaching the tuner due to a crack in the board connection. You probably have several A/V inputs that can be used for cable video and DVD video and your owners manual should explain how to connect them clearly. The outputs of those units go into the inputs of the TV set. It's That Simple!

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2 Answers

Model 2780R intermittant Picture & Sound Failure

The set has loose power conections to the tuner and judging by the model it might have other loose conections in the chassis,the loose conections need to be resoldered and might not be easy to find,try taping the side of the set to see if it reacts while is doing the problem.Be safe and call a technician unless you are familiar with tv service.

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