[TechAssist] Re: Philips combo mod# CCB092AT02 (Funai) DEAD
- From: peggs <peggs@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
- Date: Sat, 14 Dec 2002 10:57:34 -0600
If that was a PS Secondary Zener,the Primary
is probably being driven wide-open.
A Secondary Voltage will
be monitored(usually 5v supply) and fed back thru
the opto-coupler to the 'drive' circuit of the Primary,for
Regulation.
IOW,the Primary may think the monitored voltage is 0v,and
driving the primary wide open,thus overvoltage on the
33v Line,zener shorts.
Check caps in Primary,check Opto.
Any shorts on that 33v line,besides the Zener of course ???
Peggs
At 08:11 AM 12/14/02 -0800, Patrick Carroll wrote:
>
> Cutsomer was using set in van when battery exploded.
>Assuming that means surge. Found D1623 33V zenner
>shorted, replaced with 30V (closes thing), shorted
>immediatly, no scheme, anyone seen this?
>Thanks
>
>Pat Carroll
>Pats TV McDonough, GA
>patronics2003@xxxxxxxxx
>
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