I got a Samsung LE40M86BD TV set. I connect the set to old microcomputers like Atari 65XE or ZX Spectrum+ via Euro/Chinch/SVideo inputs by proper cables. The TV screen displays good picture but with a vertical shaking effect (constantly). I don't have this problem with Commodore 64, only with Atari 8-bit and ZX Spectrum. I checked other models of Atari and Spectrum and it was an identical symptom (so given model doesn't matter). I checked different cables with different inputs (composite video & S-Video) and this effect still existed. I checked Atari & Spectrum with other television sets (SONY Bravia KDL-32W55 and LG 32LD350) and no problems on these sets. I can't fix the issue with any settings from TV menu, switching sources etc. etc., I tried everything, I turn off every devices in close distance, I check different plugs (a suspicion of noises).
Problem probably is a kind of vertical synchronization issues or something similar. I have a service documentation to this TV set (from this forum) and I can entry into a service menu, but I'm afraid to experiment with settings without knowledge what I should to set (a risk of TV set damage). I would appreciate for any suggestions & help. Thanks in advance.
May 22 2007