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Panasonic tv (tx-80v02a)no picture (green line middle of screen)

Gday ohms, checked the cables running around the tube and they have good resistance,checked av cable all o.k.
any thing else i could look at ,thanks

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Like we have good power supplied to the picture tube itself ?

Posted on Aug 25, 2008

  • monk3ybidzness
    monk3ybidzness Aug 25, 2008

    like we have good power supplied to the picture tube itself ?

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have you checked in your audio menu on the set to make sure the balance is not turned to one side . the next thing to check would be your input signal if your using av cables or HDMI port . if your using av cables try switching the red and white cable around and see if you have corrected your problem . if not then it starts to look as if its a TV problem you could ohm out the speakers there usually pretty tough but its not impossible to have one that failed . if the speakers check out ok then its going to be on the main board in the set and would require further trouble shooting to determine if the audio output iC has failed or where the problem is located on the board from a coupling cap to iC or associated components . but id check at the signal going in first and work my way back to isolate the problem .

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I assume you have already checked your spark plugs to make sure they are properly gapped and are not worn or broken.

If your engine has a mechanical distributor, you probably need a new distributor cap and rotor, or at least you need to clean the high-voltage contacts. It's also possible you have bad spark plug cables. If you have an ohmmeter (one of the functions of a digital multimeter), remove one of the cables and check the resistance. If it's a wire cable, it should be no more than a couple of ohms. If it's a resistive (radio interference suppression) cable, it should not be more than a couple of thousand ohms (compare with a known good cable such as one going to another cylinder). If the cable reads very high resistance, is open, or you can't get a consistent reading, I recommend changing the entire set of cables - if two have gone bad, the rest are probably also approaching failure.

If you have separate coils for pairs of cylinders instead of a distributor, the coil feeding those two cylinders may be bad. You can test the coil secondary by reading resistance from the spark plug cable terminal to ground and comparing this to the other coils. If the ohmmeter test doesn't show anything significantly different between the good ignition circuits and the bad ones, or you don't have an ohmmeter, continue to the steps in the next paragraph. Note 1: prolonged engine operation with bad spark plugs can damage the coil. Note 2: on engines with multiple coil packs, an ignition module failure can prevent one of the coils from working, but usually the engine computer diagnostic system can identify this specific problem.

If you don't have an ohmmeter, it's more difficult to identify the problem. Try parking the car in a very dark place, open the hood, then start the engine. Turn off all artificial lights and watch the engine to see if there any visible sparks or corona discharge (the air near the part has a faint purple-blue glow) around the high voltage components. A spark from a cable indicates the cable has bad insulation. A spark or corona around the coil indicates a bad coil (broken-down insulation).

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1 Answer

Audio not ok pic ok


Hi ,
Check problem is in AV mode only or both AV and RF
If both mode problem is there follow the bellow
Other wise problem May RCA cable (AV cable)

I f you are able to open TV check speaker using a Multimeter (Tv should be OFF) continuity mode,is it shows 2 ohms or below speaker is ok, problem may be audio section of your TV.

Thank you

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Hi ,
Check problem is in AV mode only or both AV and RF
If both mode problem is there follow the bellow
Other wise problem May RCA cable (AV cable)

I f you are able to open TV check speaker using a Multimeter (Tv should be OFF) continuity mode,is it shows 2 ohms or below speaker is ok, problem may be audio section of your TV.

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Your best bet would be to either try the RG6 and adjust the antenna for lowest SWR, or if unable to get it down to an acceptable value (less than 2:1 is the worst I'd accept - but 1.5:1 is significantly better), purchase a high quality 50 Ohm coaxial cable assembly instead. Good luck!

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1 Answer

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