[TechAssist] Re: KV-32XBR55,IC651 bad,replace,runs hot then blows

  • From: "Avelino H. Guidoriagao" <avelino@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 5 Feb 2002 04:15:04 -0800

replace L501. Doesn't matter if str6301 or "A" check resistance on R523
----- Original Message ----- 
From: "Ralph Dorsey" <Merlin-Wizard@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 05, 2002 1:18 AM
Subject: [TechAssist] Re: KV-32XBR55,IC651 bad,replace,runs hot then blows


> i almost always use the original str6301 not the "A" version. The "A" 
> version will run hotter than the original. If after changing the 
> electrolytic in the primary side of the regulator and soldering the 
> board thoughrly doesn't work, try putting a cooling fan in series with a 
> 120-150 ohm 5 watt resistor on the heat sink. I've done somewhere around 
> 50 or so and haven't had any problems after that. You can get the 12 
> volt cooling fan from any radio shack. Attach it to the 15 volt supply 
> on the  same board as the regulator. Make sure to use the resistor to 
> slow down the fan a little so the customer doesn't complain about the 
> "whirring noise". I tell the customers about the "upgrade". You can use 
> a nylon tie wrap to attach the fan to the heat sink. Give it a try.
> 
> Frank Luu wrote:
> 
> >
> >I'm not sure if this IC has letter A on it. I think
> >the correct one is without the A. Also  you may have
> >to clean the the old white stuff and put new heat sink
> >compound on it.
> >Frank
> >
> >--- dave richardson <superdave826@xxxxxxx> wrote:
> >
> >>i have found when working on sony ALWAYS use exact
> >>replacement parts, no subs  
> >>  
> >>----- Original Message -----
> >>From: Ron Miller
> >>Sent: Saturday, February 02, 2002 12:52 PM
> >>To: techassist@xxxxxxxxxxxxx
> >>Subject: [TechAssist] KV-32XBR55,IC651
> >>bad,replace,runs hot then blows
> >>  
> >>
> >>IC651 STR-S6301A replaced it with a SK Series
> >>ic,esred caps replaced three
> >>all on G pcb.
> >>Set came on ran with good pix and sound, 135vdc
> >>solid reading.Ran about
> >>20min. then died,still have relay click.Heatsink hot
> >>to the touch,any tips
> >>on this problem.
> >>Ron Miller
> >>D.T.V. Texas
> >>
> >>
> >>
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> 
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