20" Samsung tv model:CT-5091XVC, chassis:KA50Z
 

20" Samsung tv model:CT-5091XVC, chassis:KA50Z, year:April 1996.No
power,relay clicks and B+ at T444=flyback is 61v instead of 125V and
pin 3 o/p of Q801=STR30125 is 85v instead of 125v.I unsoldered B+ pin
of flyback and voltage rose to 120v but when I connected a 560 ohm load
from B+ to ground the voltage dropped to 70v & pin 3 o/p of STR30125
became 90v and pin 2 (base=input) of STR30125 became 60v.
I measured the resitors and diodes in the power supply section and
jumped the electrolytics with new ones (I don't have an ESR meter) and
problem still there.

I rang the flyback using the calibration output of my TEK465 and two
0.1Uf poly caps:

http://www.iwaynet.net/~nesda/flypoor.html
http://www.iwaynet.net/~nesda/Dec02/Dec021.html
http://www.iwaynet.net/~nesda/Dec02/Dec023.html

and it was fine,here are part #'s for the flyback:

Samsung generic # FCM-20A025
Samsung OEM # AA26-30001R
HR Diemen # HR-7795
Global Electronics generic # FLY-643

Can anyone look up common repair tips for chassis:KA50Z?,thanks in
advance for replies.

Sidney
Dartmouth,Nova Scotia
Canada

20" Samsung tv model:CT-5091XVC, chassis:KA50Z
 

I did'nt found the schematics nor the tips but i the problem is still
in the power supply, replace all electrolytic caps on the primary side
of the PSU.

Ik.