[TechAssist] Re: Philips 25PS40 S321, Chassis 25T800 Off & On FIX
- From: KEVIN Wilks <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 20 May 2005 15:03:58 -0700
Actually an ESR of 1.7 is OK for a 47uF cap. According to Sencore a 47uF cap is
good up to an ESR of 9.88, which is much higher than what the Dick Smith chart
says. To err on the side of safety, if the ESR value is half way between the
two charts I will replace it. If this cap was the cause of your problems, then
it must have been failing under load.
----- Original Message -----
From: gulftech@xxxxxxxx
Date: Friday, May 20, 2005 8:41 am
Subject: [TechAssist] Re: Philips 25PS40 S321, Chassis 25T800 Off & On FIX
> Friends,
>
> I think (??) this one is now fixed. Larry and Al Marqurdt had it
> righton. Capacitor 2455, 47ufd, 25 volts had a very slightly
> higher than
> normal ESR--about 1.7 on my Dick Smith. Value read 51ufd.
> Replaced that
> and set has run for 24 hours.
>
> Also found 2488/1000@16 and 2489/470@16 bad. Replaced those as well.
>
> As a footnote, I found that the factory service remote, 4835-310-
> 57511,would also work on this T8 chassis. The vertical was too
> high. Even got
> the little "F" to come up on the screen. Maybe this remote will
> be more
> useful than I thought.
>
> Regards,
>
>
> Kenneth Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32563
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
> On Wed, 18 May 2005 18:52:27 -0400 "Larry E" <videotech@xxxxxxxxxxxx>
> writes:
> > Ken, not familiar with the "T8" chassis but the M8 had problems
> like
> > that
> > and it was
> > the 47uf cap to the H driver transformer, if it opens "no start"
> if
> > it goes
> > down in value
> > you`ll get all kinds of weird stuff, int. start, small pix then
> > shutdown,
> > For your info
> > many newer NAP sets will NOT start with the crt board removed,
> it
> > kills the
> > feedback pulse to the systems control IC from the cathode driver
> IC,
> > If the
> > pulse
> > is missing or not correct the set will shut down 10 seconds
> after it
> > comes
> > on, sorry
> > I don`t have more, Larry E
> >
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> > ----- Original Message -----
> > From: <gulftech@xxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, May 18, 2005 10:07 AM
> > Subject: [TechAssist] Philips 25PS40 S321, Chassis 25T800 Off & On
> >
> >
> > > This set will work for hours just fine, then will shut off by
> > itself.
> > > Seconds or minutes later, may come back on for few seconds,
> then
> > repeat
> > > or maybe stay off and won't turn on.
> > >
> > > Thinking it might be an intermittent flyback, I replaced it
> with a
> > new
> > > one. Thought it fixed. Ran for three hours in shop before I
> > closed up
> > > for the night. Left it running. Was off when I got in this
> > morning.
> > > Turned it on. Began doing the same thing as before--on and
> off at
> > odd
> > > intervals. Found many times that it would attempt to come on,
> but
> > shut
> > > off when the video came up. Tried adjusting screen--no
> change.
> > Removed
> > > crt board. Would come on at all. Reinstalled crt pcb. No
> power
> > up.
> > >
> > > Have checked for bad solder, leaky switches, and bad caps.
> The
> > changing
> > > nature of the problem makes troubleshooting frustrating.
> > >
> > > Any ideas?
> > >
> > >
> > > Kenneth Smith
> > > Gulf Technical Services
> > > 3034 Gulf Breeze Parkway
> > > Gulf Breeze, FL 32563
> > > 850-934-8324 (Voice) 850-932-0819 (Fax)
> > >
> >
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