CONFIDENTIAL
5 Troubleshooting
5-8
CF21G*
IC102 Pin12 input exists and
varies with different patterns?
Check and replace IC102.
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 (T502, #1)
CH1 P-P = 580 V CH1 RMS = 278.2 V
Summary of Contents for CF21G Series
Page 32: ...CONFIDENTIAL CF21G 6 1 6 Exploded View and Parts List ...
Page 33: ...Memo 6 Exploded View Parts List 6 2 CF21G CONFIDENTIAL ...
Page 61: ...CONFIDENTIAL Memo 8 Block Diagrams 8 2 CF21G ...
Page 63: ...Memo 9 Wiring Diagram 9 2 CF21G CONFIDENTIAL ...
Page 65: ...CONFIDENTIAL 10 Schematic Diagrams 10 2 CF21G 1 368 V IC601 1 ...