[TechAssist] Re: Sony - TV - KV-2063 - Buzzing Relay
- From: <tvman@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 12 Jan 2005 17:01:03 -0330
Hi David hope you are feeling better why dont you change the electro cap in
the relay circuit .I see other sets with that trouble
should be easy to trace..Eric
E M Electronics
Deer Lake NL
Canada
tvman@xxxxxxxxxxxxxxx
eric.manuel@xxxxxxxxx
----- Original Message -----
From: "David" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 12, 2005 4:21 PM
Subject: [TechAssist] Sony - TV - KV-2063 - Buzzing Relay
> Long time no talk techs! I just got out of the hospital a week ago and
> the wife gave me the go ahead to work a bit.
>
> This TV came in with no vertical deflection, replacing UPC1378
> deflection IC and several caps in and around the heat sink fixed that.
> Now on power-up (after being unplugged for a minute) the relay buzzes.
> Voltage across the relay measures 40VDC; coil on the relay is rated at
> 100VDC. Tapping the relay causes the relay to stay on and once the relay
> is on, turning the TV on and off is not a problem. I believe the +B
> source for the relay coil is derived from a half wave rectifier off the
> mains. What is the normal voltage across the relay when energized? What
> other problems could cause this relay to "buzz/chatter" besides low coil
> voltage.
>
> I did replace diode across the relay coil, relay drive transistor and
> confirmed on-off signal from micro which feeds base of relay transistor.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
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