[TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn ON - Followup
- From: "David" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 15 Feb 2005 20:20:18 -0500
Regulator works under load (40W bulb), wrong voltage though. 32V under
load, was 40V without load, should be 130V. Regulator seems to be
working; what causes low regulator output, voltage feedback opto
circuit?? IC851 opto??
David Lessard
Alexandria, Ontario, Canada
mr_fixit@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
Sent: Tuesday, February 15, 2005 6:53 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn
ON - Followup
Take the flyback out of the circuit and put a light bulb in. See if the
regulator works with a load on it. If it does then I would ring the
flyback
next and take it from there.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "David" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 15, 2005 6:43 PM
Subject: [TechAssist] Re: Samsung TV - TXE2749 - KCT52A - Doesn't Turrn
ON -
Followup
> 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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