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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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JVC TV model AV32950 just clicks once, after storm
This set clicks once when first plugged in and after that does
nothing. Are there any known failures with this model which might be precipitated by a storm? There is no apparent short in the HOT circuit or power supply and no other obvious problems. I have no schematic for this set and am not really familiar with this chassis at all. Thanks very much. Lenny Stein, Barlen Electronics. |
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JVC TV model AV32950 just clicks once, after storm
Change the 1000mfd filter next to diode in SMPS
kip -- "Watch the return E-Mail addy its false" "Lenny" wrote in message om... This set clicks once when first plugged in and after that does nothing. Are there any known failures with this model which might be precipitated by a storm? There is no apparent short in the HOT circuit or power supply and no other obvious problems. I have no schematic for this set and am not really familiar with this chassis at all. Thanks very much. Lenny Stein, Barlen Electronics. |
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JVC TV model AV32950 just clicks once, after storm
On Sat, 5 Jun 2004 15:14:18 -0400, "john"
wrote: Change the 1000mfd filter next to diode in SMPS kip JVC behaves queerly on surge, it can take out anywhere because the parts JVC likes to use is bit delicate than usual. I had a recent JVC chassis surge take IF IC out which is very deep in the circuit while leaving rest of surrounding parts intact except for few blown zero ohm SMD resistors. (easy to see with magnifer looking for tiny pit.) I usually see this in inputs circuits and sometimes in the chassis using as jumpers. Even I had a JVC once that had bad A/V selector output on the micro. :-) For yours: After change 1000uF cap still no go but power supply tries to start and shoot bit high while watching meter connected to the outputs while plugging in. If suspecting surge damage and either power supply is trying to start but shutting down, change all three digital switch transistors with DTC124EKA-X (only few cents each, SMD), Q944, Q927 and Q928 FIRST before trying to make sense of thoubleshooting. This three digital switches is responsible for wasted hours of searching because they checks out with meter because of resistors built into them. After that, finding rest of broken bits is gravy. Cheers, Wizard |
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