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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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HELP! Can't figure out TV/VCR Problems!!!!!
We've got a problem with our VCR that is about to drive us nutty! Our
motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy |
#2
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Sandy:
An important experiment he If you run the VCR and TV from the AC power directly..... and do not use the Inverter (unplug it from the AC power)..... doe the VCR still have interference??? -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "sandy" wrote in message om... We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy |
#3
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"Sofie" wrote in message ...
Sandy: An important experiment he If you run the VCR and TV from the AC power directly..... and do not use the Inverter (unplug it from the AC power)..... doe the VCR still have interference??? Yes it does. I think we've tried everything and the only thing that seems to take the lines away is taking the vcr out of the cabinet. We had it sitting on the passenger seat & it worked fine. When I picked it up and it even got close to the overhead cabinet, the lines start. Any ideas? Sandy |
#4
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"Sofie" wrote in message ...
Sandy: An important experiment he If you run the VCR and TV from the AC power directly..... and do not use the Inverter (unplug it from the AC power)..... doe the VCR still have interference??? -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "sandy" wrote in message om... We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger (snip) The fact that this only happens when installed the cabinet suggests a possible proximity problem of electro-magnetic interference. try if poss. moving ther inverter further away, or the vcr away from the TV? check the grounds - does the cabinet (if metal parts) have any voltage on it?? Ben |
#5
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"sandy" wrote in message om... We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy Radar detector? CB radio? If you have one, try a small AM transistor radio. Tune to a blank spot, and move it around the front of the RV and see where the noise gets loudest. Old trick, but it might work. |
#6
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Also, are there any 12V fans running in the area?
They're notoriously noisy, RF wise. |
#7
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We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy The problem is simple, strong dynamic magnetic field around the scan coils and h-output transformer in TV being picked up by the video heads. The solution- 1 physical separation (you have figured this) 2 shielding, try a VCR in a steel rather than plastic case or try putting some sheet steel between TV & VCR 3 swap your TV for an LCD type (they do have there own interference issues but not this type) Good luck, -- Graham. %Profound_observation% |
#8
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in TV being picked up by the video heads.
The solution- 1 physical separation (you have figured this) 2 shielding, try a VCR in a steel rather than plastic case or try putting some sheet steel between TV & VCR 3 swap your TV for an LCD type (they do have there own interference issues but not this type) Good luck, Thanks for the info...really appreciate it. We'll try shielding it tomorrow. Also try switching the vcr for another one we have that is mostly metal (still has plastic front). I feel a lot better...just getting an idea of what the problem is. Thanks again. Sandy |
#9
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#10
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You could get a DVD player to solve this problem : )
"sandy" wrote in message om... We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy |
#11
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Not Quite the same Problem, but related.
Most motor homes use a 12 Volt Inverter powered Flourescent Light .These inverters operate in the 15 Khz range ! (More efficient then 60 cycle) I was surprised to find out my Infra Red Remote Controller was not working properly (ya , I put in new batteries and tried it close up) but it would not operate at any distance. To make a long story short, I had to shield the IR sensor in my satelite dish receiver, from the Flourescent Room light Fixture. Under normal conditions flourescent Lighting is driven by 60 cycle power, and I am reasonably sure that the sensor circuits ar well filtered to block this 60/120 cycle light interference. (Hi-Pass filter circuit) In the case of 12 Volt lighting, these tubes are driven by a ~15 Khz inverter and will appear as a 15/30 Khz modulated light ( modulation invisible to the Human eye). . This modulated signal even though in the visible light range, will leak through the IR sensor and block the detector from responding to the ~15/30 Khz IR signal from the Remote Controller. Reducing the strenght of the interfereing room light by placing a magazine on top of the satelite receiver and shading the detector , eliminated the problem.. BTW I like the LCD TV idea, I suspect your TV is a Trinitron, eg SONY . I recall a rumour 20 or 30 years back that it produced a strong signal around 100/200 Khz, , the switching frequency for the trinitron screen. this would explain the 10~200 pips per line you see in the interference. I also like the DVD idea , should not be bothered by Trinitron . All of their Remote Controls will still be bothered by 12 Volt Flourescent lamps however ! Yukio YANO "sandy" wrote in message om... We've got a problem with our VCR that is about to drive us nutty! Our motorhome has a TV/VCR compartment forward over the driver/passenger seats. Cabinet is metal and you can see a jumble of TV cables and other wires that appear to go to exterior lights. The TV, Amplified antenna & VCR wires are all connect3d to a little black box (Magnadyne); Power is from an inverter which we installed. The TV works fine but the VCR has really annoying interference in the way of wide rolling lines (composed of colored dots or thingies that look like a line up of golf tees). When you take the VCR out of the cabinet, it works fine. We've tried exchanging the VCR for another and it still gets interferrence. We've tried expensive shielded cables and it didn't help at all. We'd really, REALLY appreciate any suggestions as to what the problem is and how we can fix it. We've been pretending to fix it for over a week now and my husband is about to drill holes in the dash and install the VCR there (and have cables dangling from the dash to the overhead). Can you help!!!!!!!!!!? Thanks! Sandy |
#12
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Here's what we did:
We finally decided to relocate the VCR to another cabinet farther away from the tv. We first ran cables to it (from the Magadyne black box" and tried it out. Picture was fine. So we went out & bought some longer cables so we could run the cables unobtrusively from the new cabinet to the TV cabinet. (they do run behind the TV). Hooked it up and we STILL have the lines though not as bad (and we'll probably just go with this for now as we're sick of trying to figure it out). Another thing I tried was running the vcr WITHOUT the front TV being turned on...and looking at the tv in the bedroom area. It still has the lines so now I'm beginning to wonder if the (front) TV is the culprit afterall. We're still thinking about getting a satellite dish...so maybe when we have that installed we can have somebody who knows what they're doing look at it. But if you have anymore ideas, I'm hornery enough to still want to solve this problem myself (with your help of course). Sandy |
#13
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What if the front TV is unplugged so there is no possibility of the power
supply still running in it? The other thought would then be that there is something else running that is causing RF interference. Is the motorhome engine running by chance? WT "sandy" wrote in message om... Here's what we did: We finally decided to relocate the VCR to another cabinet farther away from the tv. We first ran cables to it (from the Magadyne black box" and tried it out. Picture was fine. So we went out & bought some longer cables so we could run the cables unobtrusively from the new cabinet to the TV cabinet. (they do run behind the TV). Hooked it up and we STILL have the lines though not as bad (and we'll probably just go with this for now as we're sick of trying to figure it out). Another thing I tried was running the vcr WITHOUT the front TV being turned on...and looking at the tv in the bedroom area. It still has the lines so now I'm beginning to wonder if the (front) TV is the culprit afterall. We're still thinking about getting a satellite dish...so maybe when we have that installed we can have somebody who knows what they're doing look at it. But if you have anymore ideas, I'm hornery enough to still want to solve this problem myself (with your help of course). Sandy |
#14
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"Wayne Tiffany" wrote in message ...
What if the front TV is unplugged so there is no possibility of the power supply still running in it? The other thought would then be that there is something else running that is causing RF interference. Is the motorhome engine running by chance? WT Nope. Engine is not running. The ('92) motorhome is a "new" toy for us and we're still learning about all it's gremmies. It has a switch on the dash where you can turn off the battery power. As we put in a 2nd battery bank that is seperate from the RV's batteries and is charged by 2 solar panels, I'm thinking of turning off the RV batteries and seeing if that solves the problem. Maybe it's just haunted!!!!! Another thought....would running the cables near the TV have any influence on anything? And another thought... When we tried replacing the cables with shielded cables, we changed only the 3 cables that went to/from TV and vcr (and didn't change the wires that we couldn't reach...like wires that run thru the roof from the antenna. Would these cables have anything to do with anything? Maybe we'll just name our "ghost" and learn to live with him! Sandy Sandy |
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