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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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Schneider TV17 chassis
Hi all,
I have some trouble with a Schneider TV17 chassis. I have replaced the lopt because the set failed with a short hiss and then a crackle. I had three or four of them, all with the lopt cracked and arcing. With this one, the crack in the case wasn't that obvious, but there was a mark of the arcing on the core. The SMPS controller IC TDA16846 also went dead, so I replaced it too (searching for TV17 info revealed that the IC often fails with the lopt). The set ran fine after adjusting screen grid voltage and focus, but the screen became dark after one or two hours. What I found is that the 2A medium time lag fuse in the heater supply was open. I had this once when I started a TV17 PCB without the CRT board on the CRT neck, so the heater voltage dropper (I wouldn't call it a regulator...) shorted and blew the fuse. In that case, replacing two diodes, a zener, the BD677 series transistor and the 2A fuse cured the set. Does my problem sound familiar to someone here ? regards Stefan |
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