Tuner problems The picture on channels 2 thru 7 are poor and are somewhat snowy. On all these channels, there are vertical lines traveling across the screen.(like AC lines) Channel 3 and 4 are the worst. All the other upper channels have a flawless picture. To rule out cable problems, I put another TV next to it. No snow or lines on any of the channels. Does it sound like the tuner is "going south"? Are refurbished tuners available? Thanks in advance for your advice.

Loose connection in the tuner or the tuner is bad, this is the part that cable screws too!

The remote doesn't effect the channels, I would say you have poor signal or interference from another device nearby.

In all likelyhood, you have a bad ground somewhere in the cable. Try other channels through the VCR. If the ground is the problem, there will be a cluster of channels that are snowy with the rest being clear. Check the cable itself and all of the connectors along it.

If the cable and connectors are good, the tuner or power supply of the VCR could be faulty and cause this as well.

Dan

Usually a snowy picture means that you have a bad ground connection. You should see that some channels are beter than others. Verify that the cable connection is good. Try a different cable if you can. If that has no effect, than we need to start looking at the tuner itself. If you can change channels but just have a poor picture, chances are that a resolder of the tuner section will resolve the problem.

Keep us posted.
Dan

Sound like you lost Vertical Deflection.  Youshould not have a line across the screen because this could destroy the threeCRT Red, Green, and Blue (Picture tubes) if left on to long. There is a protection circuit built in to protect your CRT’s.    Check on the PCB-SIGNALboard (Tuner located on this board) transistors Q-206 Collector should be around 1 Volt Base and Emitter 0V. If the voltage atthis point is greater then 5 Volts the Vertical output IC-401 (Mounted on heat sink 7 pin inline IC) is bad, Part # LA7845.  Pin Voltages should be PIN 1= 0V, 2= 34V, 3= 32V, 4= 3V, 5= 3V, 6= 33v, 7= -6V.  Data sheet located at http://pdf1.alldatasheet.com/datasheet-pdf/view/40357/SANYO/LA7845.html

It is most likely a problem with the tuner, I would contact the place you purchased it or your nearest repair shop.

sounds like dm module
http://hdtvoice.com/voice/showthread.php?t=32186

Which channels? Tuners are divided into bandwidths-----
2-6 is V low, 7-13 is V high and so on.If say, 2-6 acts up, but
7 thru 13 never does,then the tuner is bad.
This solution assumes that video inputs were ok......T.

If you are on cable, first run the cable wire from the wall directly to the TV, eliminating any cable box and/or VCR. If channel 2 is snowy but the rest (especially 3-6) are clear, it is most certainly a cable problem and not a TV problem. The TV uses the exact same circuits for channel 2 to 6 (VHF-LOW) so if the tuner was bad and 2 was snowy, 3, 4, 5 and 6 would be snowy too. Bring a second TV into that room, disconnect the cable wire from the RCA and connect it to the second TV. Is channel 2 on the second TV as snowy as it was on the RCA?

It sounds like a problem with the tuner in the TV set. Hook up a VCR through the video inputs and hook the cable through the VCR and if the picture is still snowy, the problem is the cable. If the picture is clear, the problem is the tuner in the TV set. If you wanted, you could simply leave the VCR attached to the TV set and change cable channels through the VCR, or have the TV serviced. Good Luck