[TechAssist] Re: Proscan ctc169bj5 dead
- From: "Tomlee" <t8872695@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 25 Jan 2002 13:35:02 -0800
Hello My friend . JBC. Do not now your name (sorry)
I want to tell you the way I do now. I disconect the pin 38 (power on/off)
of microcontroler. Then I apply a voltage on base of Q4306. I also disconect
the cr 4304 ( 9v for horizontal) at emiter Q4305.Then I plug in ac. I
measure emiter of Q4305
I have 9v. If I apply 1v at the base of Q4306 It does not turn on this
transistor.I think to turn on this Q it need 5v of source #11.It also applys
to pin 38 through a resistor. This 5v is present after Hot is turn on .It
seem like a loop. I t is hard to find
where is the open of the loop.
Dang TVCR
----- Original Message -----
From: "jbc" <jbc@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 24, 2002 11:20 AM
Subject: [TechAssist] Re: Proscan ctc169bj5 dead
>
> Check Q4702-E for 12V LOC 14BB
> If low ck CR4118-K for abt 15V
> CR4118 @ Xmfr-3 often fails
>
> Q4705 will work only if the flyback is running. It is powered by th 26V
line @
> Fly-8
>
> ON/OFF flow is
> U3101-38
> Q4306
> Q4304
> Q4301
> Q4305-E which supplies 9V to horiz osc - turns high voltage ON
>
> Tomlee wrote:
>
> > Hello Perry.
> > I am sorry that I tell something wrong. Actually the tv has good B+
160v.
> > But When I push power button. I see voltage at pin 38 of Microcontrol
goes
> > up a bit about one volt then goes down. so q4705 never turn on and q4702
> > never turn on. So
> > it miss source #3 12v. and some sources come from q4703.I do not
know it
> > is protected or power supply fails by itself.
> > thank for help. Dang TVCR
> > ----- Original Message -----
> > From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, January 22, 2002 9:53 PM
> > Subject: [TechAssist] Re: Proscan ctc169bj5 dead
> >
> > >
> > > Check these things:
> > > Change C4108 which causes high bias on Q4101 (200165)
> > > and its failure. Also replace U4101(200419). Do not sub Chopper or IC.
> > Done
> > > 100's of these, if you do not replace IC and C4108, the set will
recall in
> > > most cases. Also change C4118 and C4102 The main thing to check is
> > > your B+ in stand by which all of the above caps, if defective, will go
as
> > > high as 200 volts (it's supposed to be approximately 140 volts)
> > >
> > > Perry Bower
> > > Electric Medic
> > > "It's Cheaper to Keep Her"
> > > 3850 Washington Road Suite 5b
> > > Martinez, Georgia 30907
> > > Phone: 706-8MEDIC4 (863-3424)
> > > Phone: 706-863-3474
> > > Fax: 706-863-2316
> > > Website: www.electricmedic.com
> > > mailto:info@xxxxxxxxxxxxxxxxx
> > > "WE REPAIR WITH CARE"
> > > More Info:
www.augusta-ga.bbb.org/report.html?compid=6001278&national=y
> > >
> > > Factory Trained Authorized Service Center For: Fisher, GE, KEC/KTV,
> > Konka,
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> > >
> > > Provide Extended care for: AON, Circuit City, GE Contracts, Glass
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> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Tomlee
> > > Sent: Tuesday, January 22, 2002 11:20 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Proscan ctc169bj5 dead
> > >
> > >
> > >
> > > Hello techs.
> > > I am working with proscan CTC169BJ5. it is dead .Q4101 is not working.
> > > suspect ic 4101 fails. Is there any tips for this problem.TIA.I am not
> > > familiar with this brand TV.
> > > Dang TVCR
> > >
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