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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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hissing chopper
Panasonic tc-63R50N color tv
HOT ok. 106v at Collector. no HV no heater. sound ok. can change channels + adjust volume. this set has a separate p/s board using an STR51213. tested resistance on this ic, no pins shorted. the chopper is making a squealing noise while turned on. done the usual, esr caps, checked all the big resistors, transistors. what should i look at next? |
#2
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The noisy chopper might be normal if there is no horizontal drive. It's
probably supposed to be locked to the line rate and there's nothing for it to lock onto. I'd look into why there is no drive. JURB |
#3
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BigTom wrote:
Panasonic tc-63R50N color tv HOT ok. 106v at Collector. no HV no heater. sound ok. can change channels + adjust volume. this set has a separate p/s board using an STR51213. tested resistance on this ic, no pins shorted. the chopper is making a squealing noise while turned on. done the usual, esr caps, checked all the big resistors, transistors. what should i look at next? You've got a TV with a chopper? I've never seen such a thing. Maybe you mean something in the horizontal output section? -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#4
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Maybe you mean something in the horizontal output section?
No, chopper is sorta slang for the output device in a switched mode power supply, or the entire power supply itself. (unless there are long forks sticking out of the front) JURB |
#5
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JURB6006 wrote:
Maybe you mean something in the horizontal output section? No, chopper is sorta slang for the output device in a switched mode power supply, or the entire power supply itself. (unless there are long forks sticking out of the front) JURB It seems odd (to me) to re-use a term that already applies to a different electronic device. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#6
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"CJT" wrote in message ... JURB6006 wrote: Maybe you mean something in the horizontal output section? No, chopper is sorta slang for the output device in a switched mode power supply, or the entire power supply itself. (unless there are long forks sticking out of the front) JURB It seems odd (to me) to re-use a term that already applies to a different electronic device. What device? The only electronics I've ever heard "chopper" apply to is the switching transistor in a SMPS. |
#7
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James Sweet wrote:
"CJT" wrote in message ... JURB6006 wrote: Maybe you mean something in the horizontal output section? No, chopper is sorta slang for the output device in a switched mode power supply, or the entire power supply itself. (unless there are long forks sticking out of the front) JURB It seems odd (to me) to re-use a term that already applies to a different electronic device. What device? The only electronics I've ever heard "chopper" apply to is the switching transistor in a SMPS. Youngster. g This should yield plenty of examples: http://www.google.com/search?as_q=ch...h=&safe=images -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
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