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PostPosted: Mon Mar 16, 2009 8:59 pm    Post subject: samsung 793df Reply with quote

Monitor is samsung 793df. Is it dead, no LED light, no stand by, can't switch on. Fuse is OK and nothing burned in power supply (I think).
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jts1957



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PostPosted: Tue Mar 17, 2009 12:19 am    Post subject: Reply with quote

Have you checked voltages at power supply connectors that go to other boards? Should have (at least) a 5 volt and 12 - 24 volt supply.

No "bulging" tops on electrolytics in power supply?
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PostPosted: Tue Mar 17, 2009 4:01 pm    Post subject: Reply with quote

No voltage. Capacitors are OK. Replaced DP704 and nothing.
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jts1957



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PostPosted: Tue Mar 17, 2009 6:18 pm    Post subject: Reply with quote

Do you have AC to bridge rectifier?
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PostPosted: Tue Mar 17, 2009 11:47 pm    Post subject: Reply with quote

Yes.
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jts1957



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PostPosted: Wed Mar 18, 2009 3:19 am    Post subject: Reply with quote

Do you have raw B-Plus at bridge rectifier?

I don't have schematic. What is function of DP704?
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Justmanuals



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PostPosted: Wed Mar 18, 2009 5:50 am    Post subject: Reply with quote

This Parts & Service manual w/schematics can now be purchased for $10.77 and downloaded immediately after payment from http://www.justmanuals.com


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PostPosted: Wed Mar 18, 2009 2:38 pm    Post subject: Reply with quote

There is voltage on the big electrolytic.[/u]
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jts1957



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PostPosted: Wed Mar 18, 2009 8:08 pm    Post subject: Reply with quote

Is raw B-Plus at regulator?
How is "stand by" source derived in this unit?
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PostPosted: Sun Mar 22, 2009 11:52 pm    Post subject: Reply with quote

There is raw B-Plus. I think transformer is dead.
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