[TechAssist] Re: RCA model F27669TX51 no picture
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 7 Feb 2006 16:37:11 -0500
Walter, shorted spark gap? does the voltage change on the collectors if the
crt card is removed from the tube? You
would assume it would go up not down though, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 07, 2006 3:35 PM
Subject: [TechAssist] RCA model F27669TX51 no picture
>
>
> > Chassis CTC 203AA5.
> > Customer said that set took a long time to come
> > on,
> > then quit coming on at all.
> > High voltage OK, filiments lit.
> > Sound OK
> > Picture and OSD not visable.
> > Screen Voltage OK and variable.
> > Turning Screen control up will get a washed out
> > red
> > picture with retrace.
> > Collector voltage on Q15101/2/and 3 is high at
> > 176
> > volts. Base and emitter are OK.
> > Video waveform seems OK at IC U12101 pins
> > 30/31/and
> > 32, but is not good on the collectors of
> > Q12701/2/and 3.
> > 12 volts is present on collectors of those, and
> > the
> > emitters are OK. And I don't see all three
> > failing
> > at once.
> > But voltage on the bases and Pins 30/31/and 32 IC
> > U12101 is low at 1.6volts.
> > However the ABL voltage at pin 29 of U12101 is
> > high
> > at 6.3 volts.
> > For this reason, I'm doubting that U12101 is at
> > fault, but not sure what is.
> > Any suggestions appreciated.
> > TIA
> > Walter
>
>
>
> Walter Wood
> United TV Service
> 501 Poplar St.
> P.O. box 602
> Pulaski Tn. 38478
> mailto:wwood_38478@xxxxxxxxx
> --------------------------------------------------------------------------
---
> This Email List is accessible to the general public through search
engines. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation
mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Email Archives: //www.freelists.org/archives/techassist/
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.375 / Virus Database: 267.15.2/251 - Release Date: 2/4/2006
>
-----------------------------------------------------------------------------
This Email List is accessible to the general public through search engines.
Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
