[TechAssist] Re: Sony KV32FS10, IC650 main reg shorted,still shuts down

  • From: Frank Luu <fkluu@xxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 11 Nov 2002 10:38:40 -0800 (PST)

Hello:
On the input of IC650 to turn on this regulator you
need at least 15v to the input to get 12v out. Check
diode and filter cap. Problem may be on C board as
well.Unplug 200v cable from main board  see if it
still shut down.(check IC). also vertical IC need to
be check.
Good luck
Frank Luu

--- Phil Bader <philbad@xxxxxxxxxx> wrote:
> 
> Was dead.Ordered the manual. The 12V three-terminal
> v. reg IC650 was
> dead shorted (BA12T on part) looked like an LM7812.
> Ordered and
> installed Sony original.The output pin on it is only
> 4.9 volts.(input is
> about 13.5 VDC)The tech lifted virtually all the 12v
> feeds "down stream"
> he could find and still 4.9VDC. IC650 has low
> output, but is cool,so
> not  pulling excess current. Baffeled as to why. The
> 9V reg IC641 has 9V
> out. The +135 V source is OK. 
> It died in the "on" state, so tries to come on when
> plugged in. Get a
> burst of  high voltage,then shut down.
> Customer is, of course "less than understanding"...
> I am assisting another local shop.
> He called Fulton Radio for assist,but drew a blank.
> Please help if
> possible.
> Phil Bader
> -- 
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821    
> email: philbad@xxxxxxxxxx
> 
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