[TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn ON - Followup
- From: "David" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 15 Feb 2005 18:43:09 -0500
This may be my last post on this chassis. This is very frustrating. I've
spent too much time on this problem but I'm curios to know what the
problem is.
Eric, I replaced C816 and still no go. I've checked just about every
transistor, diode, capacitor and resistor in the SMPS circuit. I'm
stumped! Something is causing the +B 130V not to come up to its
operating voltage.
These are the voltages I measured:
Q801 8.0V regulator:
Q801-(B)-6V
Q801-(C)-10V
Q801-(E)-5.4V
Q802 14.5V regulator:
Q802-(B)-14V
Q802-(C)-14.5V
Q802-(E)-14.6V
+B - 40V
IC851 opto-coupler:
1-13.2V
2-12.2V
3-6.1V
4-2.4V - this should be .1V
IC852 sense IC:
1-40V
2-12V
3-0V
As I stated in one of my previous post, +B 130V and Q802 voltage return
to normal when the SMPS control module (HC802) is removed. TV still
doesn't turn on though.
Perhaps someone looking at these voltages could make better sense of
what is going on with this dog. The voltages around both Q801 & Q802
Thanks again,
David Lessard
Alexandria, Ontario, Canada
mr_fixit@xxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David
Sent: Tuesday, February 15, 2005 4:28 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn
ON - Followup
No, its okay Eric, you already sent it to me weeks ago, I just never got
around to taking a closer look at this TV. I'll check back with you
soon, going to replace this cap now.
David Lessard
Alexandria, Ontario, Canada
mr_fixit@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
tvman@xxxxxxxxxxxxxxx
Sent: Tuesday, February 15, 2005 4:20 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn
ON - Followup
David do you need the schematic Eric
E M Electronics
Deer Lake NL
Canada
tvman@xxxxxxxxxxxxxxx
eric.manuel@xxxxxxxxx
----- Original Message -----
From: <tvman@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 15, 2005 5:48 PM
Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn
ON -
Followup
> I have replaced cap several time for no power Eric
> E M Electronics
> Deer Lake NL
> Canada
> tvman@xxxxxxxxxxxxxxx
> eric.manuel@xxxxxxxxx
> ----- Original Message -----
> From: "David" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, February 15, 2005 5:37 PM
> Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't
Turrn
ON -
> Followup
>
>
> > Eric,
> >
> > I get no click when I hit the power button, C816 is the filter cap
for
> > 14.5V, I don't see how this can affect the +B 130V. I will check
this
> > cap and let you know if I find anything.
> >
> > Thanks,
> >
> > David Lessard
> > Alexandria, Ontario, Canada
> > mr_fixit@xxxxxxxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
> > tvman@xxxxxxxxxxxxxxx
> > Sent: Tuesday, February 15, 2005 3:52 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't
Turrn
> > ON - Followup
> >
> > David check this cap it,s close to the vert ic..Eric
> > XE2749
> > Clicks once goes into
> > shutdown
> > C816(1000uf/25v)
> > E M Electronics
> > Deer Lake NL
> > Canada
> > tvman@xxxxxxxxxxxxxxx
> > eric.manuel@xxxxxxxxx
> > ----- Original Message -----
> > From: "David" <mr_fixit@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, February 15, 2005 5:04 PM
> > Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't
Turrn
> > ON -
> > Followup
> >
> >
> > > I can hear the SMPS chirp at plug-in. With the HOT disconnect from
the
> > > FBT +B 130V measures only 40V. Q802-(E) voltage is supposed to be
72V
> > > but measures only 14V. When I pull HC802 SMPS control module +B
130V
> > is
> > > present as well as Q802-(E) voltage. I'm not sure but I think
there
> > may
> > > be a problem with the SMPS module. What am I missing here? Any and
all
> > > input is greatly appreciated as I know nothing about this chassis.
> > >
> > > Thanks in advance,
> > >
> > > David Lessard
> > > Alexandria, Ontario, Canada
> > > mr_fixit@xxxxxxxxxxxx
> > >
> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
> > > tvman@xxxxxxxxxxxxxxx
> > > Sent: Tuesday, January 25, 2005 1:12 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't
> > Turrn
> > > ON
> > >
> > > David check this out it,s located by the vert ic..Eric
> > > TXE2749 Clicks once goes into shutdown C816(1000uf/25v)
> > > E M Electronics
> > > Deer Lake NL
> > > Canada
> > > tvman@xxxxxxxxxxxxxxx
> > > eric.manuel@xxxxxxxxx
> > > ----- Original Message -----
> > > From: "David" <mr_fixit@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, January 24, 2005 12:47 PM
> > > Subject: [TechAssist] Samsung TV - TXE2749 - KCT52A - Doesn't
Turrn ON
> > >
> > >
> > > > Hello Gentlemen,
> > > > I am still under strict orders from the wife to take it easy, as
> > most
> > > of
> > > you know already I recently joined the zipper club. Having said
that,
> > I
> > > need
> > > help please with this TV. The customer said one day it just didn't
> > come
> > > on.
> > > SMPS fires up on plug-in but hitting the power ON button does
nothing.
> > I
> > > need a service manual to figure out the standby/micro circuits
please!
> > > >
> > > > Thanks in advance.
> > > >
> > > > David Lessard
> > > > mr_fixit@xxxxxxxxxxxx
> > > > Alexandria, Ontario, Canada
> > > >
> > > >
> > >
> >
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