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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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Sony KV20FV12
Unit has a bright blue raster with retrace linesTurn screen way down and get
picture, Blue cathode= 70VDC, Red and green = 179VDC, Unplug picture tube and same readings. Voltage comming into CRT board at CN705 is R= .86, G= .86, B= 3.58, I am thinking Jungle chip (CXA2131CS) Dont have a schematic, Anyone have a pinout and maybe some voltage readings Thanks Charlie |
#2
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Sony KV20FV12
I don't want to disappoint you, but from experience this sounds more like a
short in the CRT, and not the jungle chip. You can check the jungle chip by putting in a standard colour bar test pattern at the input of the set, and looking at its outputs on a scope. The service manual for this set is available from Sony. If you want to get deep in to this set, you will definitely require the service manual. The jungle chip is rather expensive, and is only available from Sony. I would not advise changing it, unless you can actually verify that it is bad. It is very rare that this IC does fail. -- Jerry G. ===== "Charlie East" wrote in message ... Unit has a bright blue raster with retrace linesTurn screen way down and get picture, Blue cathode= 70VDC, Red and green = 179VDC, Unplug picture tube and same readings. Voltage comming into CRT board at CN705 is R= .86, G= .86, B= 3.58, I am thinking Jungle chip (CXA2131CS) Dont have a schematic, Anyone have a pinout and maybe some voltage readings Thanks Charlie |
#3
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Sony KV20FV12
A pinout for the chip(cxa2131cs) would be great
"JerCharliery G." wrote in message ... I don't want to disappoint you, but from experience this sounds more like a short in the CRT, and not the jungle chip. You can check the jungle chip by putting in a standard colour bar test pattern at the input of the set, and looking at its outputs on a scope. The service manual for this set is available from Sony. If you want to get deep in to this set, you will definitely require the service manual. The jungle chip is rather expensive, and is only available from Sony. I would not advise changing it, unless you can actually verify that it is bad. It is very rare that this IC does fail. -- Jerry G. ===== "Charlie East" wrote in message ... Unit has a bright blue raster with retrace linesTurn screen way down and get picture, Blue cathode= 70VDC, Red and green = 179VDC, Unplug picture tube and same readings. Voltage comming into CRT board at CN705 is R= .86, G= .86, B= 3.58, I am thinking Jungle chip (CXA2131CS) Dont have a schematic, Anyone have a pinout and maybe some voltage readings Thanks Charlie |
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