[TechAssist] Re: RCA Chassis CTC169BG2 No Power
- From: Mike Barnett <passthecash@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 14 Nov 2001 06:36:25 -0800 (PST)
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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> > >
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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/
> >
> > *****************************************
> > Help make your TechAssist online repair tips
> > database better! Submit your fixes here:
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>
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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/
*****************************************
Help make your TechAssist online repair tips
database better! Submit your fixes here:
http://www.circuitwork.com/techassist/tip/#tips
*****************************************
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