[TechAssist] RCA F26041DG, CTC157C no vertical: line only

  • From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 24 Jun 2004 13:28:28 -0400

Avisual check showed cap leakage stain on the main center chassis behind 
the vert IC.
I changed caps C133k, 220mfd@35v , C164: 100@25V.
In the vert section, leaking C53K: 470@25V and C502K: 220@35V.
Washed the area.
No vertical at all. Just a line, has audio.
Replaced the LA7831.
LA7831 has volts on pin 5,8, so it has good Vcc source.
Checked a 3.9 meg R4512, ok
I get a good sawtooth at input to Q4501 "vert sawtooth" transistor's 
base. Nothing out the emitter. Can't see how it's stopping it. 
Transistor seems OK.
 Traces seem OK.
I don't have anything on file for this oldie.
phil Bader

-- 

Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx



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