Haier 21FA18-T Service Manual page 26

2
Normal
Test filament voltage
Normal
Check the voltage
of all pins of XS903
Normal
Video amplifying
l
board is abnorma
Check to see if +8V
voltage is normal at
Whether G2 voltage is normal
Abnormal
Heater Resistor
open
Abnormal
Inspect the circuit
from pin50 、51、
52 of N201 to
video amplifying
T401,VD415 or
C415,C416 are
Normal
PIN 17 of N201
Check G201、N201 and
peripheral circuit of N201
No raster
Test the base voltage of V431
Normal
Check to see if be
voltage of V432 is
existed?
NO
Check the voltage
of V432 collector is
normal
Higher
broken
Abnormal
Change wrong component
or check peripheral circuit
Normal
24
Abnormal
Abnormal
Check the circuit
from pin13 of N201 to
V431
YES
InspectT401、R436
etc
Lower
V432 is not well
welded or open
Abnormal
Check +8V power supply
.