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4.
Change V902 or
weld V902 again
5
Cut of C601，connect red pen of multi-meter(R*1K)with
ground,and black pen tap Pin1 of N602 if there is snapping
Yes
Power amplifier is normal.
Check N101 and external SIF
Normal
Check SIF circuit and speaker
Lack of red
Check to see if V902 is
open or not well welded
Picture exists but no sound
circuit
Yes
Check muting circuit
and V601\V602
Maintenance Service and Trouble Shooting
Check to see if voltages of XP902
are normal
Yes
Replace CRT、
Cut off collection electrode of V602,use
black pen of multimeter tap Pin1 of
N601 if there is snapping sound
No
Check ircuit between
Pin19 of N201 and
XS202
No
No
Check to see if
+19V exists
Abnormal
Inspect +19V
power supply
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