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Tech Head - The Technology Section
The Work Bench and Soldering Station
Repairing televisions
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<blockquote data-quote="wolsty" data-source="post: 931" data-attributes="member: 175166"><p>Thanks for the response, zansi.</p><p></p><p>The tv was given to me by a friend when he upgraded. He said it had a faulty switch but, when I tried it, there was no problem and it worked faultlessly for about six months. Then it failed. When I opened it up, there was a very obvious dry joint (scorch marks and evaporated solder) on the diode connected across the chopper transistor. I tested some of components with a multimeter and replaced the obviously faulty ones (diode, transistor and some resistors) as well as, for good measure, the IC controller, although I have no way of testing this item. I couldn't find a faulty capacitor, although this is probably due to my inexperience.</p><p></p><p>The psu is still dead, although the thermistor which controls the degaussing coil operates at switch on. </p><p></p><p>Any suggestions?</p><p></p><p>wolsty</p></blockquote><p></p>
[QUOTE="wolsty, post: 931, member: 175166"] Thanks for the response, zansi. The tv was given to me by a friend when he upgraded. He said it had a faulty switch but, when I tried it, there was no problem and it worked faultlessly for about six months. Then it failed. When I opened it up, there was a very obvious dry joint (scorch marks and evaporated solder) on the diode connected across the chopper transistor. I tested some of components with a multimeter and replaced the obviously faulty ones (diode, transistor and some resistors) as well as, for good measure, the IC controller, although I have no way of testing this item. I couldn't find a faulty capacitor, although this is probably due to my inexperience. The psu is still dead, although the thermistor which controls the degaussing coil operates at switch on. Any suggestions? wolsty [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
Repairing televisions
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