RCA CTC187CJ3 Bright white picture, screen control powerless!!

[Tim Marcus]

This television has excessive brightness. I have checked tuner
grounds, resistors on CRT and near flyback. No unusually high ESR
caps. B+ is normal. Flyback adjustment does little. This problem is
not in the database I use.

Has anyone dealt with this before? As usual any advice is welcomed,
and thanks to all who are willing to help! - Tim

 

[fidik]

This problem is well documented, bad connections on tuner and/or EPROM.

http://repairfaq.ece/drexel.edu/sam/ctc175a1.jpg

 

[David]

ctc177 series bright screen. in order
1. Tuner grounds failure causing eeprom corruption.
2. Low Video output b+ supply due to failing 200 v scan derived supply
capacitor.
3. Cracked ground connection to flyback focus/G2 divider.

That chassis is so very well documented with all the failures from the tuner
grounds it is well worth your time to look it up, start at
www.repairfaq.org.

 

[Ray]

Check for shorted video buffer transistor. Between tuner and flyback near
rear of PCB (Q1903??)

 

[Shoreline Electronics]

Check for an Open L5001 Choke On 200 Volt Line On Crt Module
120uh Rca # 195750


==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
[email protected]
========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd

 

[Tim Marcus]

I found an open transistor on the CRT board which took care of the
brightness. Now there is excessive blurriness. Everything is smeared
over to the right about 8 inches. I will check out the choke tomorrow
when I go back to work. Thanks all - Tim