Samsung TT20A54X/XAX Service Manual page 19

Troubleshooting
6-2 No Picture or Raster
Abnormal
Check/Replace
TU01, IC201.
Check IC901
Pin 14
Check T444 B + (125V)
6-2
Check the
voltage of IC201 pin 5
(Normal : 5V)
Normal
Check/Replace L205
Check the voltage
of tuner
Abnormal
Check/Replace
IC202
Normal
Check the voltage
of tuner
Check/Replace
tuner
Abnormal
Check the coil voltage
of Q804
Check the voltage
of Tuner
Check the voltage
of Tuner
Check
the voltage of IC202, IC201,
TU01,VDD
Normal
Abnormal
Check the output
of IC201 Pin 47, Pin 9
Normal
Check
Abnormal
the signal input
of IC202 Pin 1
Normal
Check
Abnormal
the signal output
to IC202 Pin 6
Normal
Check
the signal output to
IC201 Pin 41
Normal
Check the signal
Abnormal
output to IC201 Pin 41
Normal
Check
Abnormal
the signal input to
IC200 Pin 19,20,21
Normal
Check
Abnormal
the voltages of CRT Drive
(180V, 9V)
Normal
Abnormal
Check the signal
input to CRT cathode
Abnormal
Check the main power
Abnormal
Check the voltage
of IC201 Pin 44
Normal : 2.5V
Check C239
Abnormal
Check
Abnormal
the signal input
of IC201 Pin 37
Normal
Check/Replace
IC201.
Abnormal
Check the voltage
IC200 Pin 29
Abnormal
Check/Replace
F/S circuit
Normal
Check/Replace
CRT
Samsung Electronics