CONFIDENTIAL
5 Troubleshooting
5-12
CF21G*
5-2 General Troubleshooting
5-2-1 No Picture
LED blinks?
G2 Voltage is right?
Check D598, D599 and G2 wire.
Also check around FBT circuits.
Check the CRT Socket which
it is connected with CRT.
Replace the CRT.
LED is blinking once a second?
Yes
No
No
Heater Voltage is right?
Check CN201 Assy and D642, Q672.
Yes
No
R, G, B Cathode is right? Return back the No Video (5-1-17)
troubleshooting guide.
Yes
No
Go to 5-2-2 Shut down
troubleshooting guide.
Yes
5-2-2 Shut Down
LED is blinking so fast
(Once per 300m sec)?
No
Check signal cable and signal source.
Yes
Check SDA (IC201 Pin 12) and SCL
(IC201 Pin 11) Replace IC280, IC201.
Yes
20
WAVEFORMS
20
R, G, B, Video
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 ...