[TechAssist] Re: RCA Chassis CTC169BG2 FIXED!!!
- From: Mike Barnett <passthecash@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 15 Nov 2001 05:43:45 -0800 (PST)
Thanks to all who had suggestions, they all were helpful.
After changing cr4118 the set seems to be stable.
Also trimming the standby voltage took care of the high on q4401.
the set has been running for about 24 hours now and i think i'll ship it
today.
Thanks again guys.
Mike Barnett
On Wed, 14 Nov 2001 07:52:51 -0800, techassist@xxxxxxxxxxxxx wrote:
>
> No! The voltage at CR4102 is OK. You will know right away if that diode
has
> trouble. You may want to trim the standby voltage by adjusting the POT
next to
> U4101. Monitor the 140 volts supply in the stand by mode and adjust the
POT for
> 143 +- 3 volts.
>
> Dennis
>
> > Thanks guys for all the replies,
> >
> > I replaced cr4118 installed the board. standby voltages are:
> > CR4118 =13.5
> > Q4401 =150v using tuner as ground
> > Q4302 = 13.5
> >
> > I'm still concerned about cr4122 the 3 volt zener, it still measures
only
> > 1.5 vdc. Should this be a problem? or should i just change it?
> >
> > Set is now running and the color is consistant even when changing
channels.
> > Q4401 is running high in standby(150vdc) and is at 140v with the set
on.
> > we'll see what happens after runnning awhile.
> >
> > Thanks again guys for all your help, unless you have anymore
suggestions
> > i'll let you know if it makes it through the day.
> >
> > On Tue, 13 Nov 2001 20:31:13 -0800, techassist@xxxxxxxxxxxxx wrote:
> >
> > >
> > > Mike:
> > > Your all over the place with this est. I have a strategy with this
> > television.
> > > First and always first check the standby voltages.
> > >
> > > Check CR4118(K). It must be at least 12.8 volts in the standby mode.
> > > Check Q4401(C) it must be no more than 145 vdc and no less than 138
vdc.
> > > Check Q4302(C) it must be the same as CR4118(K)
> > >
> > > If CR4118(K) is low float Q4302(C) and see if it rises. If not
replace
> > CR4118.
> > > If voltages rises then replace Q4302. (The diode is a high failure
rate
> > and will
> > > cause intermittent chroma, or shutdown, or flickering luminance).
> > >
> > > Try these and let me know the results.
> > >
> > > Denins
> > >
> > >
> > > Mike Barnett wrote:
> > >
> > > >
> > > > > Hey Guys,
> > > >
> > > > Need some help w/ this one. Here's how it goes, Set came in with
> > > > no power and loses color Intermit complaint. looked around and
did'nt
> > find
> > > > anything out of the ordinary. I replaced the three caps in chopper
> > > > curcuit(c4102,c4104,c4108) was also missing vcc run voltage at pin
16
> > of
> > > > u4101, changed it too. re-assembled and set came up. unit was
running
> > good
> > > > all voltages seem to be good with the exeption of cr4102 was quite
a
> > bit
> > > > low. still had the intermit color. when changing channels it take
about
> > 1
> > > > second to have colorand accationally the pic would go to b+w. also
then
> > the
> > > > set would shut down losing 200v.. At pin 16 of u4101 still had
runvcc v
> > but
> > > > missing3v at cathode of cr4102. even when the set was running the
> > voltage at
> > > >
> > > > cr4102 is very low/about 1.5v. this is supposed to be 3vdc? The
set
> > shut
> > > > down and now will not power up at all. Have 170 @ collector of
q4101
> > and 12v
> > > >
> > > > at pin 16 of u4101. missng 200v from pin 10 of fly and checked
r4703.
> > > > checked pin 16 on ICu1001 for 5.7vdc and is missing, checked Q2906
it
> > was
> > > > good but i changed it anyway with ECG288. Still didn't fix. Have
180v
> > at
> > > > collector of Q4402 and cr4401.
> > > > Changed horizonal retrace cap c4401 and changed c4402 and cr4403.
> > > > CAN ANYONE HELP WITH THIS??? I'm Going outa my mind.
> > > >
> > > > TIA
> > > > Mike Barnett
> > > >
> > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Get It Fixed At
> > > > > Rochester Electronics
> > > > > 630 West Ridge Rd.
> > > > > Rochester, NY 14615
> > > > > 716.663.6870
> > > > > www.RochesterElectronicsRepair.com
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > _______________________________________________________
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> > > >
> > > > Get It Fixed At
> > > > Rochester Electronics
> > > > 630 West Ridge Rd.
> > > > Rochester, NY 14615
> > > > 716.663.6870
> > > > www.RochesterElectronicsRepair.com
> > > >
> > > > _______________________________________________________
> > > > Send a cool gift with your E-Card
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> >
> > Get It Fixed At
> > Rochester Electronics
> > 630 West Ridge Rd.
> > Rochester, NY 14615
> > 716.663.6870
> > www.RochesterElectronicsRepair.com
> >
> > _______________________________________________________
> > Send a cool gift with your E-Card
> > http://www.bluemountain.com/giftcenter/
> >
> > *****************************************
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Get It Fixed At
Rochester Electronics
630 West Ridge Rd.
Rochester, NY 14615
716.663.6870
www.RochesterElectronicsRepair.com
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