Sylvania 6319CCB, Service Manual, Page: 37 / 108

Repair method #2
Check the primary rectifying diodes (D603-D606) as
possible problems. Remove the above mentioned parts
and check them. Perform check according to the step
1 and 2 of repair method #1 and check for defects
following parts, then if necessary replace with factory
originals..
R602 is open or not.
Q601, Q602, D607, D608 and D611 are short or not.
Repair method #3
The feedback circuit which is monitored by the output of
D613 105V may not work and this may be regarded as
a possible cause, remove IC601 (Photo Coupler), diode
(D620) and transistor (Q604) check for defects.
Repair method #4
Check control circuitly which is connecting to Pin 2 and
1 of Switching Transformer T601.
1-8-16 T5200TR1