[TechAssist] Re: Samsung,TV,mod#TXE2545,chass#KCT52A,No vert FIX,Now no sound or Pix

  • From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 11 Mar 2004 09:09:32 -0500

All,
I have a few tips to check for open coil L301.
Here's what I have..though varies a little differently from The Speaker:

Samsung\TXE2745\No vertical deflection and L301(10µH?) 
burnt\\\\IC301(TDA8350Q)*C302( 0.15UF/100V)*R307(1
OHM 1/2W)*R308(1 OHM 1/2W)*R417(5.6 OHM 1/2W)\Note In some cases C302 may be 
0.1UF/100V but replace with
0.15UF/100V\May have to adjust the service parameters\TURN OFF then press 
MUTE*1*8*2 and power. This will
get you in the factory mode\\\\\



Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net

----- Original Message ----- 
From: "Kevin Gunn" <kgunn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 10, 2004 8:48 PM
Subject: [TechAssist] Re: Samsung,TV,mod#TXE2545,chass#KCT52A,No vert FIX,Now 
no sound or Pix


This is the ST 301 info.

Samsung CTV, No Vert. Kit ST-301
By: Joe Sopko, CET

These are Samsung 25" and 27" afflicted with "No Vert. Deflection" due to
failure of the Vert. output IC301 (TDA8350). After replacing the IC, it ran
quite hot to the touch. Well, in certain models, Samsung also recommends
installing a "Kit" to "improve the reliability of the vert circuit". The
models are: TXE2545, TXE2546, TXE2549, TXE2745, TXE2746, and TXE2749.

I could see how running hot might compromise reliability, so I ordered part
# ST301 for $11.80 from Fox, however, if you want to home brew your own kit,
the values and installation details follow:

Change value of C302 (IC pin 9 to ground) from .15uF to .22uF@100V
Add a zener diode (MA2560, ECG5090A, 56V, 1W) in parallel with C302. Cathode
to pin 9 of IC301, anode to ground.
Add a zener diode (MTZ15C, ECG5024, 15V, 1/2 W) from IC301 pin 3 to ground.
Cathode to pin 3, anode to ground.
Add a .47uF@100V capacitor from the yoke pin "V2" (green wire) to ground.
Add a 10uh coil in series with existing coil L304 located off pin 9 or IC301
just behind the chip.

Now, as to the vast heat reduction brought about by installing the kit.

Well, it wasn't even "half-vast". It still ran pretty not. After your finger
was on it for one second, you'd want to take it off. I posted an inquiry on
the NesdaNet for other's experiences with this kit. Several replies echoed
my own experience - not much of a heat reduction, and some said that they
don't bother with the kit anymore - just let it run hot.

I had ESR'ed all the caps in the vert pump-up diode, resistors OK and the
set had normal height and Lin., so based on the experiences of others, I
assume that it is meant to run hot. I did add an additional metal "heat
sink" on to the "face side" of the IC and got more of a heat reduction from
that than installing the kit.

Overall, it seems that this set is destined to be run in the winter to aid
with household heating bills.

Top of Form 1
Bottom of Form 1

Kevin Gunn
Star Tek Electronic Services
390 Springbank Drive
London, Ontario
www.ulurn.com/startek

N6J 1G9             519-473-6366

----- Original Message -----
From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 10, 2004 12:48 PM
Subject: [TechAssist] Re: Samsung,TV,mod#TXE2545,chass#KCT52A,No vert
FIX,Now no sound or Pix


> Tks for your reply Bob,however when I scope pin 5 of IC701=AV switching IC
> there is good video.This is the TV i/p pin.On pin 14,the o/p I have no
> signal.If I lift pin 14 & jumper my i/p to the trace where I lifted pin 14
> my video appears on the tv.That's why I'm assuming this IC is bad or does
> the EEPROM enable this IC to allow the video signal to pass through?
> Don of HARTS-TVCR''ASC''
> 9 Robert St,Oromocto,NB,Can,E2V3N2
> hartstv@xxxxxxxxxxx
> Tel-5063579785,fax-3576010
> cel-4701719
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, March 10, 2004 10:18 AM
> Subject: [TechAssist] Re: Samsung,TV,mod#TXE2545,chass#KCT52A,No vert
> FIX,Now no sound or Pix
>
>
> > That sounds like you may very well have a bad EEPROM which is a very
> common
> > failure on these. I suggest you order and try one.
> >
> > 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: "Don Hartigan" <hartstv@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, March 09, 2004 6:26 PM
> > Subject: [TechAssist] Samsung,TV,mod#TXE2545,chass#KCT52A,No vert
FIX,Now
> no
> > sound or Pix
> >
> >
> > > Unit had no vert. sweep;Replaced TDA8350=IC301.Now have no sound or
> > pix.A/V
> > > i/p's are good.All volts to tuner are good,ie 5,12 & 30 vdc.Replaced
> > > tuner,no help.Think it may be the A/V switching IC701=M51321,not
> switching
> > > into the tuner mode.Have searched all my sources for a data sheet so I
> can
> > > scope this IC & had no luck.Can someone send me a pdf or pin out for
> this
> > > IC.Has anyone got any other ideas for this problem.The reason I think
> the
> > > switching IC 701 is latched up is when I select tuner & i/p video on
the
> > > video i/p jack I get my pix,but of course it shows the video I have
> > > inputted.........TIA...........
> > > Don of HARTS-TVCR''ASC''
> > > 9 Robert St,Oromocto,NB,Can,E2V3N2
> > > hartstv@xxxxxxxxxxx
> > > Tel-5063579785,fax-3576010
> > > cel-4701719
> > >
> > >
> > >
> >
>
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