[TechAssist] Re: Sony TV KV32XBR10 - HI ESR, blue retrace line, black screen

  • From: Al Gutz <alg@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 17 Jan 2004 23:29:17 -0500

Gary
 Is it possible that the original has all the stuff boiled out of it and
there is a problem that wants to make the replacement cap go the same
way.
What is the voltage on the cap? Two reasons for cap to run hot,
overvoltage or the AC current is exceeding the ratings of the cap

AL G

Gary McCartney wrote:
> 
> I have this Sony Tv, model KV32XBR10 with mutiple problems.
> 
> First, when turned on, there is one blue retrace line at the top of the
> screen and the rest of the screen is black. After a few seconds, the
> picture comes on blinking once per second or so. I adjusted the screen
> control up and the picture comes on but the retrace line is still
> visible at the top. If I turn the screen back down, the picture goes
> back to it's blinking.
> 
> On the CRT board, I shorted out R701 (series resistor to heater) and the
> result was the same. Also replaced the blue disc cap (680pF 2kV) to G2
> and again, no difference. This set does not use the infamous CX1477AS
> jungle IC.  Does it sound like the CRT is on it's last legs (IK fault)?
> I don't have a rejuvenator worth calling a rejuvenator- B&K 465) so
> trying to restore the tube is not a good option, unless the customer is
> gonna junk it anyways.
> 
> Next, I thought I'd check the caps on the power supply board for high
> ESR. Good thing because I found a couple of bad ones. One, I am having
> problems replacing. It is C651, a 2.2uF 160V, 105 deg C.  When I
> replaced it with another same spec but different brand, the set would
> fire up with HV but before the screen would light up, I could hear the
> HV shut off leaving only sound. Also noticed the sound pitch of the SMPS
> alter to a much lower freq. oscillation, so I unplugged before problems
> occured. Replaced cap with still a different brand and the set came on
> and ran ok but after 2 minutes this new cap was hot enough I could smell
> the plastic wrap on it. Put the original cap (very high ESR doesn't
> hardly register on my cap wizard) back in and the set runs fine and cap
> doesn't heat up. Is C651 a special type of capacitor? Should I just
> leave the original in and forget about it?
> 
> Thanks for any help.
> --
> 
> Gary McCartney
> 
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
> 
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