[TechAssist] Re: Sony TV KV24FV10, no start- just chirping
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
- Date: Fri, 25 Jun 2004 08:47:43 -0700
39v on the HOT shouldn't be right.
Either it's being pulled down(HV,Pix Tube,yoke,secondary Rectifiers)
or it can't handle a load(Power Supply)
Peggs
At 12:25 PM 6/24/04, Gary McCartney wrote:
>I have a Sony 24" KV24FV10 flat CRT set in the shop. The set doesn't
>start up. It just chirps continuously. On the odd occasion, the sound
>will come on for maybe 3 seconds then the power simply turns off. The
>waveforms on the HOT base and collctor are also pulsing but don't look
>proper. I get 39V dc on the HOT collector as it pulses.
>
>I have removed the flyback and tested it with my HR Diemen flyback
>tester and I get a perfect looking collector waveform with it. Tester
>shows flyback to be working fine (those not familiar, this tester
>actually connects the anode lead and drives the flyback just like the TV
>hor. output stage, although at a reduced test rate. I haven't had this
>tester fail me yet). I have also soldered the hor. driver transformer
>and other connections on main board and power supply board. Have checked
>for bad transistors diodes and resistors as well. I downloaded the
>manual and am looking it over now.
>
>Are there any common faults for these symptoms? I've read that the
>flyback is a possibility but with my test, I'm not sure what to make of
>that.
>
>Thanks for any help.
>--
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>Guelph Ontario Canada
>Est. 1984
>email: gary (at) number63.ca
>
>
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