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6 Troubleshooting
CKA42*7L/5227L
6-3
Check screen VR of FBT and G2 Pin.
Check IC604.
Power indicator is green
Check signal cable
and signal source
Does DC 12 V appear at
Pins 16 and 5 of IC101?
Does the video pulse
appear at Pins 4, 6 and 8
of IC101?
Check IC101
Check IC101.
Check clamp circuit on
the Main PCB and
IC202 (pin #37).
Check contrast control
circuit (IC202 on the
Main PCB)
Does the video pulse
appear at Pins 13, 17 and
19 of IC101?
Does the clamp signal
appear at Pin 10 of IC101?
6-4 No Video
Yes
No
Yes
No
Yes
Yes
No
No
No
Does the video amplified
pulse appear at the Pins
8, 9 and 11 of IC102?
Yes
No
Does the video amplified appear
at the Pin #1, 3 and 5 of IC102?
Yes
Yes
Does the DC voltage appear
at pin 9 of IC 101?
No
36
Check CRT.
No
Does the right R, G, B waveforms
appear at the disconnected
Video PCB from CRT?
Yes
37
13
WAVEFORMS
5.04 V (IC202, #37), Clamp
CH1 P-P = 5.04 V
CH1 RMS = 5.024 V
13
4.92 V (IC101, #19)
CH1
∆
= 4.92 V
CH1 RMS = 2.120 V
36
72.0 V (IC102, #1)
CH1
∆
= 72.0 V
CH1 RMS = 45.76 V
37
Содержание CKA4217L
Страница 2: ...Samsung Electronics Co Ltd September 1997 Printed in Korea Code No BH68 60933A ...
Страница 10: ...Memo 2 Product Specifications 2 4 CKA42 7L 5227L ...
Страница 38: ...Memo 8 Exploded View and Parts List CKA42 7L 5227L 13 4 ...
Страница 62: ...11 Schematic Diagrams 11 4 CKA42 7L 5227L 33 34 35 36 37 38 11 6 Video Part Schematic Diagram ...