5 Troubleshooting
5-8
CF21M*
IC102 Pin12 (19”: IC101, Pin15)
input exists and
varies with different patterns?
Check and replace IC102 (19”:IC101).
Input full white pattern to monitor.
No
Yes
T501 Pin 8 Voltage exists?
Check and replace T501.
Yes
No
IC103 Pin 16 output exists and
varies with different patterns?
Check and replace IC103.
Yes
No
Check and replace IC102 and CRT
Check CN102, Q101, Q102, ZD101.
5-1-15 ABL Failure
5-1-16 Focus Failure
IC250 Pin 11 and 32
output are right?
Check and replace IC261.
Yes
No
Some parts around Q551,
Q552, Q553 and Q540 are right?
Replace failed part.
Yes
No
Some parts around T502 are right?
Replace failed part.
Check the connection between FBT
Pin 13, CRT Socket PCB.
Yes
No
13
14
Does the voltage of Q541
collector change as the FH function
is changed on the OSD menu?
Check Q541 and others components.
Yes
No
WAVEFORMS
13
2.20 V (IC250, #11, 32)
CH1 P-P = 2.20 V CH1 RMS = 2.776 V
14
580 V (T501, #1)
CH1 P-P = 580 V CH1 RMS = 278.2 V
Summary of Contents for CF21M
Page 7: ...CF21M 6 1 6 Exploded View and Parts List ...
Page 17: ...10 Schematic Diagrams 10 6 CF21M 1 368 V IC601 1 ...
Page 19: ...10 Schematic Diagrams 10 8 CF21M 19 IC103 5 24 15 CRT Socket Red Green Blue 20 R G B Video ...
Page 21: ...10 Schematic Diagrams 10 10 CF21M Memo ...
Page 22: ...Memo 9 Wiring Diagram 9 2 CF21M ...
Page 23: ...Memo 8 Block Diagrams 8 2 CF21M ...
Page 48: ...Memo 7 Electrical Parts List 7 26 CF21M ...
Page 49: ...7 Electrical Parts List CF21M 7 27 Loc No Code No Description Specification Remarks ...
