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Tech Head - The Technology Section
The Work Bench and Soldering Station
Help in Fixing TV
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<blockquote data-quote="spiney" data-source="post: 108426" data-attributes="member: 192438"><p>When picture goes monochrome, set has "lost" chrominance signal, often only because the tuning has drifted, did you try retuning? (do it with AFC off, if possible).</p><p></p><p>Intermittent problems are usually heat related, bad contacts or dry joints "crack" as they warm up. When switched on, does your set start off ok, then problem appears after 20 mins or later?</p><p></p><p>For PAL crystal trimmer, wiper might "disconnect" from track, try very gently pushing down on the circular metal bit, be careful not to break it, might just do the trick, it shoudn't make it worse.</p><p></p><p>In general, it's not a good idea to "twiddle" things randomly, without access to test equipment and service manuals (but repair technicians see this frequently!).</p><p></p><p>Tube colour purity problems are from stray magnetic fields (that's why "home cinema" loudspeakers are shielded!). There's an internal degaussing coil, in series with thermistor, this operates when set switched on, then "drops out" after a few seconds. For bad magnetisation, this isn't enough, then you need a service technicain's degaussing coil, rub it over screen front, slowly pulling away. Trinitrons are very susceptible to magnetisation, because of their internal structure.</p></blockquote><p></p>
[QUOTE="spiney, post: 108426, member: 192438"] When picture goes monochrome, set has "lost" chrominance signal, often only because the tuning has drifted, did you try retuning? (do it with AFC off, if possible). Intermittent problems are usually heat related, bad contacts or dry joints "crack" as they warm up. When switched on, does your set start off ok, then problem appears after 20 mins or later? For PAL crystal trimmer, wiper might "disconnect" from track, try very gently pushing down on the circular metal bit, be careful not to break it, might just do the trick, it shoudn't make it worse. In general, it's not a good idea to "twiddle" things randomly, without access to test equipment and service manuals (but repair technicians see this frequently!). Tube colour purity problems are from stray magnetic fields (that's why "home cinema" loudspeakers are shielded!). There's an internal degaussing coil, in series with thermistor, this operates when set switched on, then "drops out" after a few seconds. For bad magnetisation, this isn't enough, then you need a service technicain's degaussing coil, rub it over screen front, slowly pulling away. Trinitrons are very susceptible to magnetisation, because of their internal structure. [/QUOTE]
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Help in Fixing TV
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