Haier 21F3A-T Service Manual page 19

2
Normal
Test filament voltage
Normal
Check the voltage
of all pins of XZ603
Normal
Video amplifying
l
board is abnorma
Check to see if +9V
voltage is normal at
PIN 17 of N204
No raster
Whether G2 voltage is normal
Abnormal
Heater Resistor
open
Abnormal
Inspect the circuit
from pin50 、
51\52、51 of N204
to video amplifying
T402,VD415 or
C415,C416 are
broken
Normal
Check Z901、N204 and
peripheral circuit of N204
Maintenance Service and Trouble shooting Maintenance Service and Trouble shooting
Abnormal
Test the base voltage of V444
Normal
Check to see if be
voltage of V411 is
existed?
YES
NO
Check the voltage
of V411 collector is
normal
Lower
Higher
V411 is not well
welded or open
Abnormal
Change wrong component
or check
Normal Abnormal
Check +9V power supply
18
Abnormal
Check the circuit
from pin13 of N204
to V444
InspectT401、R437
.
etc