[TechAssist] Re: Mitsubishi CS2715R, Pulses at turn on FIXED
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 20 Jun 2003 09:31:30 -0500
Bob,
You are a genious! I had changed the two caps you mentioned and checked
Q5H4. What I didn't check was E-C. It was leaky. Wouldn't know it
unless it were pulled from the set. Q5H4 = 2SA933 Used 2SA1015.
Thank you SO much!
On Fri, 20 Jun 2003 08:33:37 -0400 "Gemini Computer & TV"
<geminitv@xxxxxxxxxxxxxxxx> writes:
> Ken,
> Replace C916 and C5H9 (47mfd/50V) which is a common failure. Also
> check Q5H4
> and R5K7.
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
> www.geminicomputertvsecurityalarms.com
>
> ----- Original Message -----
> From: <gulftech@xxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, June 19, 2003 7:47 PM
> Subject: [TechAssist] Mitsubishi CS2715R, Pulses at turn on
>
>
> > This set has been a nightmare. Came in first time for "dark
> picture and
> > buzzes." Replaced 20-25 bad caps. Sent home. Two weeks later,
> back for
> > "Takes a long time to come on."
> >
> > When power is pushed, power relay clicks, then pulses. By that I
> mean
> > click..click..click. Starts out at about one second intervals.
> This
> > interval decreases--the clicks comes faster. After 30 seconds or
> so, set
> > stays on, picture perfect. After on for a few minutes, set turns
> off and
> > on at will. Unit must be left off for some time for the problem to
> > happen again.
> >
> > Feel like it must be a cap in the power supply, but can't find it.
> Have
> > ESR'd all the caps on the deflection/power supply board, found two
> more
> > bad, but no change. I have resoldered the board and cleaned it
> from old
> > electrolyte leakage. Have no print. Maybe the standby to the
> power
> > relay is low. Real tough set to work on.
> >
> > Hope someone has a clue.
> >
> > TIA,
> >
> >
> > Ken Smith
> > Gulf Technical Services
> > 3034 Gulf Breeze Parkway
> > Gulf Breeze, FL 32563
> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> >
> > ________________________________________________________________
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