[TechAssist] Re: Mitsubishi/Electrohome Chassis-WM-B-C15R
- From: "teltek3" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 Jun 2003 11:08:05 -0400
Kenny....you're a genious...or you have a good memory.C5H9 was the culprit.
Funny how you can smell them after you unsolder them. Oh well it needed a
good "Cap" change anyway, all the ones I did replace, smelled a little
"fishy".
Now I'm going to have to pull that Mitsubishi Rear Projection out of
mothballs, and see if this was the problem on that one. Same symptoms
anyway.
Thanks again Ken.
-Ed-
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, June 25, 2003 10:37 AM
Subject: [TechAssist] Re: Mitsubishi/Electrohome Chassis-WM-B-C15R
> Hi, Ed.
>
> See if this helps. It's a copy of a post I send last week (with
> responses) with a similar problem.
>
> ----------------
>
> 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)
>
> -----------
>
> Ken
>
>
> On Wed, 25 Jun 2003 10:25:05 -0400 "teltek3" <teltek3@xxxxxxxxxxxx>
> writes:
> > This is actually an Electrohome Model 79CK02...and could find a Mits
> > equal
> > in my records.
> > This set will start of with a single relay click, then clicks off
> > then on.
> > Very slow at first...about once per second...in the next 5 minutes
> > the
> > interval get faster and faster, then finally on it comes.
> > This is from a cold start...after it's been on..it's OK. Have
> > changed varios
> > caps in Regulator circuit, and changed the Regulator. There must be
> > a cap
> > I'm missing. Any help appreciated.
> >
> > Thanks..
> >
> > -Ed-
> > Tel-Tek Electronics
> > Ontario-Canada
> > teltek3@xxxxxxxxxxxx
> >
> >
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