Toshiba 21S04B Service Manual page 27

Abnormal
Check
Level Shifter Q909, Q910
Output(If 2N7000 Output has the DC
Component over 0.7V, it is broken)
Normal
Check
Abnormal
Replace
MICOM
Q909, Q910
IIC #2, #3
Normal
Check
Replace
IC902 EEPROM
EEPROM(IC902)
Normal
Check IC201S
Note : When you check whether any component is normal, you must let the output pin be open in order not to be affected by the side of output.
Plug in Power Cord
Check
ON
LED lamp
Check Normal
MICOM IIC #5, #6
Check
Normal
the MICOM Power #59
With Remote Controller
Abnormal
Normal
Abnormal
Replace
Q908
Normal
Abnormal
Check
IC802, IC803
Normal
Check
Abnormal
IC201S VDP
H-OUT #50
Normal
Abnormal
Check
Q401 H-TR
Normal
Abnormal
Check
135V Line
PC801S, IC801S
Normal
Replace
FBT
OFF
Check
Abnormal
IC903 3.3V Regulator
Input Voltage
Replace
the MICOM
Check
D801 and D811
Replace Q908
Check
IC804 Input Voltage
Replace
IC802, IC803
Check
R828 and D805
Replace
IC201S
Check
IC801S and FP801S
Replace
Q401
Check
Check
IC901 MICOM
Input Voltage
Normal
Abnormal
Check and Replace
the MICOM
Normal
Check and Replace
IC903
Abnormal
Abnormal
Replace
D801 or D811
Normal
Normal
Check and Replace
IC804
Abnormal
Normal
Check and Replace
R828 or D805
Abnormal