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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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Panasonic video NV-F65EB, test pattern distorted.
Following happens when i watch TV via videotuner (not recording).
When watching the testpattern from Denmark or Sweden the vertical white lines are zigzagging right and left for every horizontal white line in the pattern. Zigzagging can be up to 1 centimeter. It looks like too much antennasignal, but I have tried to lower antennasignal up to 40 dB/uV (heavy snow) but the problem is still there. Have scoped voltages to tuner and modulator, no ripple on scope. When watching ordinary TV (not testpattern) vertical lines are not steady. What am I missing? Regards Jørgen. |
#2
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Probably bad ESR on electrolytic capacitors in the powersupply. With the
oscilloscope you can't see that. Greetings PP "Jørgen Christensen" schreef in bericht . dk... Following happens when i watch TV via videotuner (not recording). When watching the testpattern from Denmark or Sweden the vertical white lines are zigzagging right and left for every horizontal white line in the pattern. Zigzagging can be up to 1 centimeter. It looks like too much antennasignal, but I have tried to lower antennasignal up to 40 dB/uV (heavy snow) but the problem is still there. Have scoped voltages to tuner and modulator, no ripple on scope. When watching ordinary TV (not testpattern) vertical lines are not steady. What am I missing? Regards Jørgen. |
#3
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Thanks, I will check the caps. I have just received an ESR tester from
England today. Regards Jørgen |
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