[TechAssist] Re: av27920
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 9 Jun 2003 15:33:24 -0500
In addition to the vertical IC there may be a cap or two, and there is a 75v
zener diode,D422 off of the vertical IC pin 2 which has been known to cause
problems. The set won't work without vertical IC input is pin 2, output
pin 4. Aprox 23V on pins 3 and 6.
Slow the scope down and see if you get vertical out of/into the ic. Also,
these sets appear to be as picky with the vertical ic as Sony power supplies
are with the 2sc4834s.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "Juan Guzman" <j_guzman51@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, June 09, 2003 2:59 PM
Subject: [TechAssist] av27920
> Av27920 is dead.
> Had shorted vertical output ic.replaced is stiil dead.
> Checked for shorts and found none.
> Suspect micro is not allowing horizontal transistor to activate flyback to
> generate the needed voltages.
> Any suggestions.
> Also will apreciate if i could get the flyback schematics.
>
> Juan Guzman
>
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