5 Troubleshooting
CF21M*
5-13
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 (5-1-16)
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 30) and SCL
(IC201 Pin 29) Replace IC280, IC201.
Yes
20
WAVEFORMS
20
R, G, B, Video
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 ...
