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

  • From: <hartstv@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 24 Jul 2003 22:02:50 -0300

Yes,I tryed that Jonas,but no diff.
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: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, July 24, 2003 9:36 PM
Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32''


> To eliminate one circuit as being the culprit, pull the plug from the
audio
> board. I believe its J/P1906 or 1904(not at the shop). Then see if it
fires
> up.
>
> Jonas Miglinas
> Miglinas TV
> Chicago
> ----- Original Message -----
> From: "Larry E." <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, July 24, 2003 6:56 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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