[TechAssist] Re: PRIMA mod#XT2079-WIERD FIX?????

  • From: Eric Manuel <tvman@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 20 May 2005 20:00:30 -0230

Hi Don a tip here for you  Eric
        Prima           XT-2079         Dead. C511 exploded , R507 overheated   
        Replace 
C511 (47uf/50v) , R507 (1.8Kohm)


   Eric
E M Electronics
Deer Lake Nfld
Canada
tvman@xxxxxxxxxxxxxxx

Don Hartigan wrote:
> Customer dropped this unit off.Said no power on.Plugged it in on test bench 
> &heard a loud bang & smoke.Removed the cover & found a cap in the 
> SMPS,location # C511 destroyed.Schematic says it's a 47ufd@50v .I removed the 
> remains of C511.Before installing a new cap I checked the other components in 
> the SMPS & all aok,as was the HOT & accosiated ccts.I powered the unit ''ON'' 
> & have normal operation,ie good audio & video.This is with C511 out of cct.I 
> measured 22.5 vdc across the solder pads of C511& 80.25vpp with the scope.I 
> though the orginal cap was under rated for this cct,so I installed a 
> 47ufd@100vdc .Now the set will not power on???I reinstalled the exact value 
> as the orginal,47ufd@50vdc;still no power on.I removed the C511 cap & all is 
> aok????I'm stumped!! BTW if you have any of these units gathering dust in 
> your shop ,I suggest removing this cap for a ''no power on problem''.It may 
> be a FIX.....Anyone having an input,I'm all 
> ears...........TIA.........regards........
.
> Don of HARTS-TVCR"ASC"
> 9 Robert St.,Oromocto,NB,Canada,E2V3N2
> Tel#506-357-9785,Fax#506-357-6010
> hartstv@xxxxxxxxxxx 
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