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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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Optiquest Monitor no HV
I have a 19" Optiquest Q95 monitor, model VCDTS21554-1M which has no HV.
The strange thing is that, when it first comes on, there is B+ on the collector of the Horizontal output transistor. The collector waveform has the usual well-formed spike with no extraneous smaller spikes which would indicate a shorted windings in the flyback. The base waveform is also perfect. But there is not a drop of high voltage. After about 30 seconds, the B+ shuts down. I suspect some sort of an open condition in the HV rectifier portion of the output transformer but have no way of proving this. Any ideas? -- Bert Christensen, Toronto, Ontario web: http://bertc.com An Eclectic Collection of Fine Art, Weird Recipes, Weird Art, Good Fun & Humour |
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Hi Bert,
There are a couple of simples tests you can subject the FBT to at http://www.noahtec.com/fbtest.htm Wayne On Mon, 31 Jan 2005 08:42:22 -0500, "Bert Christensen" wrote: I have a 19" Optiquest Q95 monitor, model VCDTS21554-1M which has no HV. The strange thing is that, when it first comes on, there is B+ on the collector of the Horizontal output transistor. The collector waveform has the usual well-formed spike with no extraneous smaller spikes which would indicate a shorted windings in the flyback. The base waveform is also perfect. But there is not a drop of high voltage. After about 30 seconds, the B+ shuts down. I suspect some sort of an open condition in the HV rectifier portion of the output transformer but have no way of proving this. Any ideas? -- Bert Christensen, Toronto, Ontario web: http://bertc.com An Eclectic Collection of Fine Art, Weird Recipes, Weird Art, Good Fun & Humour |
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