[TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''

From: <hartstv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Fri, 25 Jul 2003 16:13:28 -0300
Your right Jim,should be 577.This g/d tv has got me going brain-dead........
Don of HARTS-TVCR-ASC
9 Robert St,Oromocto,NB,Canada,E2V3N2
Tel-506-357-9785,Fax-506-357-6010
hartstv@xxxxxxxxxxx



----- Original Message -----
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 25, 2003 4:07 PM
Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''


> I hope that is a typo, a NTE177 is a small, glass, signal diode!
> **************************************************
> Jim Myers
> Since 1972
> Telrad Electronic Services Co.
> Fort Wayne, IN 46815
> *************************************************
> ----- Original Message -----
> From: <hartstv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 25, 2003 2:03 PM
> Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
>
>
> Larry,yes C4118 was replaced & I tryed both a 177 & 580,but read that a
177
> is a better sub??Really don't want to connect C of HOT until I get this
p/s
> working properly.The Q4601 cct i will dive into again & see if I missed
> something...........
> Don of HARTS-TVCR-ASC
> 9 Robert St,Oromocto,NB,Canada,E2V3N2
> Tel-506-357-9785,Fax-506-357-6010
> hartstv@xxxxxxxxxxx
>
>
>
> ----- Original Message -----
> From: "Larry E." <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 25, 2003 2:49 PM
> Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
>
>
> > Don, if the original C4104 was 15uf @ 50v I would replace it with that
> value
> > Pin 3 is correct so that`s not the problem. You mentioned in another
> > post that you replaced CR4118 with a NTE177, that`s not a good
> > substitute, has to be an ECG/NTE 580, the C voltage on Q4601
> > appears to be a problem, it should be a steady 13.1 volts in standby
> > did you check replace C4118 off pin 16 of U4101 yet? What
> > happens to the voltages in the switchmode if you connect the collector
> > of the HOT but don`t turn the set on? Larry
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> > 352-795-0124
> >
> > hartstv@xxxxxxxxxxx wrote:
> >
> > > Tks for your reply,Larry.Here are the values of the orginal caps
removed
> > > from the smps;
> > > C4102=2.2ufd/100v
> > > C4104=15ufd/50v
> > > C4108=47ufd/50v
> > > The voltage at Q4101 is varying from 159vdc to 164vdc.
> > > The voltage on the collector pad of the HOT Q4401 is varying from
13vdc
> to
> > > 40vdc;NOTE this is without the collector of HOT connected to pad & yes
> I'm
> > > using the correct grounds.
> > > Pin 3 of U4101 is varying from 0vdc to .013vdc.
> > > I know there are hot & cold grounds for these measurements.The HOT
> collector
> > > voltage is low because the chopper is not in it's proper duty
cycle.This
> is
> > > the same voltage measured at the cathode of CR4116,the 145vdc source.
> > > I did replace C4104 with a 4.7/100v cap,as per your email but have
same
> > > voltage readings.What I don't understand is the orginal cap was
> > > 15ufd/50v.Man this is wierd?? Tks again for your help...regards...
> > > Don of HARTS-TVCR-ASC
> > > 9 Robert St,Oromocto,NB,Canada,E2V3N2
> > > Tel-506-357-9785,Fax-506-357-6010
> > > hartstv@xxxxxxxxxxx
> > >
> > > ----- Original Message -----
> > > From: "Larry E." <videotech@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, July 24, 2003 8:56 PM
> > > Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
> > >
> > > > Hi Don, you need to be carefull changing parts in a 169 chassis with
a
> pa=
> > > > rts list from a 27" proscan, there are 4 different families of 169
> chassi=
> > > > s`s and some of the parts
> > > > are very different, for example C4108 in your set (family 1) is
> supposed =
> > > > to be a
> > > > 47uf @ 50 volts but in a family 4 169 it`s a 39uf @ 100v,  BIG
> difference=
> > > > =2E
> > > > The usual cause of pin 16 on U4101 fluctuating up and down is the 3
> caps =
> > > > you changed, or U4101 is bad check the values, C4102=3D 2.2 @ 100v
> C410=
> > > > 4=3D 4.7 @ 100v(not 47uf)  C4108=3D 47uf @ 50v. If those are good
then
> th=
> > > > e set is either in ovp or ocp You should have the following in
standby
> (s=
> > > > et plugged in but not turned on), Raw B+ on C of Q4101 =3D approx.
165
> vo=
> > > > lts, Regulated B+ on C of HOT=3D approx.144 volts, 5v standby on E
of
> Q46=
> > > > 01. If the above are correct, check voltage on pin 3 of U4101, it
> shouldn=
> > > > `t be above .6v (point 6 volts) if it is the
> > > > set is going into ocp shutdown. Let me know the results of these
> measurem=
> > > > ents,
> > > > I don`t have a scanner but I do have the schematics and 169
> troubleshooti=
> > > > ng guide.
> > > > Remember that a lot of the capacitor values are different for the
> various=
> > > >  169 models
> > > > so be careful to replace what you pull out with the same value,
Larry
> E
> > > > Larry Eastman
> > > > American TV & Electronics
> > > > Crystal River, Fl. 34428
> > > > 352-795-0124
> > > > pulling out
> > > > hartstv@xxxxxxxxxxx wrote:
> > > >
> > > > > This direct view 32'' unit has me baffeled.Orginally came in with
> the H=
> > > > OT shorted.Replaced with an OEM 2SD1885.Everything else was ok so
> fired i=
> > > > t up.The HV was 38.5KV,too hi,so took the chass out to bench
> test.Turned =
> > > > it on without a yoke plugged in & I think that's when my problems
> started=
> > > > =2EQ4802 smoked in the pin cct.Replaced it & plugged a yoke to the
> set.No=
> > > > w my smps won't start.Pin 16 reads 8.5vdc then slowly goes up to
> 10.5vdc =
> > > > & then starts going back down to 8.5v.So changed all the normal
parts
> for=
> > > >  this smps,ie,the U4101,C4102,4,8,Q4101.Did not help.Replaced the
> infamou=
> > > > s CR4118.Checked or replaced both LM311 in the vert & pin cct;also
> C4403,=
> > > > CR4401,CR4402.Again no go.Checked or replaced all trans in the PWM
> cct,Q4=
> > > > 405,6,7,8,9.Same results;the regulator is trying to start but keeps
> going=
> > > >  up/down from 8.5v to 10.5v.Raw B+ is solid at 165vdc,no ripple.All
> these=
> > > >  tests were done with HOT collector lifted.I have checked all my
tips
> for=
> > > >  this unit,& I know there's a ton of them but
> > > > >   can't find the problem.I have changed so many parts too
numereous
> to =
> > > > mention,ie caps,diodes,transistors but I'm stumped.Any assistance
> would b=
> > > > e greatly appreciated or if someone would be so kind to email a pdf
> for t=
> > > > his brute.The only print I have is a profax for the 27'' set.BTY i
> also c=
> > > > hecked all transistors in the Q4300 & Q4700
> series.........TIA...........=
> > > > =2E
> > > > > Don of HARTS-TVCR-ASC
> > > > > 9 Robert St,Oromocto,NB,Canada,E2V3N2
> > > > > Tel-506-357-9785,Fax-506-357-6010
> > > > > hartstv@xxxxxxxxxxx
> > > > >
> > > > >
> ***********************************************************************=
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References:
- [TechAssist] RCA-CTC169AM,chass-f31221wn-32''
  - From: hartstv
- [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
  - From: Larry E.
- [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
  - From: hartstv
- [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
  - From: Larry E.
- [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
  - From: hartstv
- [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''
  - From: Jim Myers
[TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''

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