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/