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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 GDM-2038 Line Deflection Help Please!
Dear Fixers
I have a lovely Sony Trinitron monitor that has suddenly died, and need some experienced insight please. A few weeks ago the monitor died and I found that the LOT driver 2SD1887 had gone short circuit. Not realising that the line output stage and the EHT circuit had different driver transistors, I searched my junk and found a 2SC3897 which looked very similar when comparing datasheets. I fitted the new transistor and the set burst into life and has worked happily for about a month. However it died again and the PSU was 'wailing' like crazy. This time both the EHT transistor (2SC3897) and the 2CS3997 (line deflection transistor) are short circuit. I wonder if there is a stock fault that anyone can give me a hint about? Alternatively ..is it possible to get hold of/buy this part of the schematic somewhere? It seems a shame to have to 'bin' such a lovely (and up till now) trusty monitor. Can someone help please? Thanks in anticipation....Dave |
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Dave: I would the small electrolytic capacitors that are part of the driver circuit for these transistors. They are usually located nect to the driver transformer. Use an ESR meter, or just replace them if in doubt. Many better monitors use an FET to regulate the supply voltage going to the flyback and sweep transformer. Sometimes the FET will short or the electrolytic capacitor will weaken causing the FET to fail to regulate properly. Of course, the flyback (LOP transformer) might be going bad, which means it is time to look for another monitor. Hope this helps... John |
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