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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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Dodgy JVC RGB SCART socket input
Hi all, any useful advice would be mucho appreciated
I have a 1998 JVC AV-29S2EK (UK PAL) TV and recently tried to use the RGB input facility of SCART socket 1 and the Blue signal is not getting through, (yellow cast to picture and whites are yellow). (Have never used the RGB input in the past). Normal TV input, composite input through the same SCART and S-video through another SCART give a picture of normal colour. Both Scart cables tried and RGB source (UK digital TV decoder) proved OK on another TV. When I measure resistance across the RBG input + ground pairs the Red and Green circuits quickly ramp up to about 70 Ohms, (assuming a capacitor in circuit charging up), the Blue sits at around 0.5 ohms. I "imagine" that the R,G,B, input circuits must be fairly minimal, virtually straight to the guns?. Could it be just a duff cap in the blue input line from SCART 1 ?. Thanks in advance for any insightful input and advice. P.S. Dab hand with a soldering iron etc, have repaired some VCR PSU's and some CCTV processing equipment(transmission, multiplexers, switchers, PSU's) and yes I do know how the dangers of TV HV circuits before a kind soul advises "the little lady" about that. Regards Jenny |
#2
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Dodgy JVC RGB SCART socket input
It sounds more like you have a short on the input , rather than an open.
Defective capacitors generally go opened, not shorted. But, once in a while I have seen a shorted cap. The other side of the cap, may be going to a high impedance input, so if the cap was shorted and the short was not before the cap, the meter would read a high resistance. I am sort of guessing here, because I do not know the particular design of your set. I would first look to see if there is a short right on the input of the set. The 70 ohms you are reading on the good channels is the termination resistor for the video. It should actually be 75 ohms ideally. This is all speculation to where I would start... -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Jenny Talia" wrote in message ... Hi all, any useful advice would be mucho appreciated I have a 1998 JVC AV-29S2EK (UK PAL) TV and recently tried to use the RGB input facility of SCART socket 1 and the Blue signal is not getting through, (yellow cast to picture and whites are yellow). (Have never used the RGB input in the past). Normal TV input, composite input through the same SCART and S-video through another SCART give a picture of normal colour. Both Scart cables tried and RGB source (UK digital TV decoder) proved OK on another TV. When I measure resistance across the RBG input + ground pairs the Red and Green circuits quickly ramp up to about 70 Ohms, (assuming a capacitor in circuit charging up), the Blue sits at around 0.5 ohms. I "imagine" that the R,G,B, input circuits must be fairly minimal, virtually straight to the guns?. Could it be just a duff cap in the blue input line from SCART 1 ?. Thanks in advance for any insightful input and advice. P.S. Dab hand with a soldering iron etc, have repaired some VCR PSU's and some CCTV processing equipment(transmission, multiplexers, switchers, PSU's) and yes I do know how the dangers of TV HV circuits before a kind soul advises "the little lady" about that. Regards Jenny |
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