7 Troubleshooting
CHA42*7L/5**7L
7-9
7-2-3 No Raster
: No Raster means (Power: OK, High Voltage: No)
Is 12 V on C629?
Check and replace
Q605, Q602,
Q606,
IC101,
IC401.
Yes
Check signal cable and pattern.
No
Is 0 V on IC202’s Pin 7 (sus)?
Yes
No
Check and replace
IC202.
Are H/V sync on IC202’s
Pins 29 and 30?
Yes
No
Is 56 V on C517?
Refer to 7-2-1 No Power.
No
Yes
Does oscillation waveform
appear on IC401’s Pin 6?
Check and replace
C409,
IC401,
R406.
No
Yes
WAVEFORMS
3
Does horizontal output waveform
appear on IC401’s Pin 26?
Check and replace Q403, T401,
Q402,
T501, Q508.
No
Yes
4
Is Q402 OK?
Replace it.
No
Yes
Is Q508 OK?
Replace it.
Check and replace
D409, D408,
D403, D515.
Check and replace
IC401, Q403,
T401, D503, D505, D519, C440, C407,
D216, Q203,
T501, CRT.
No
Yes
Operating?
Yes
3
5.12 V (IC401, #6)
CH1 P-P = 5.12 V
CH1 RMS = 4.256 V
4
4.60 V (IC401, #26)
CH1 P-P = 4.60 V
CH1 RMS = 3.054 V
Summary of Contents for CHA4217L
Page 2: ...Samsung Electronics Co Ltd August 1998 Printed in Korea Code No BH68 61127A ...
Page 10: ...Memo 3 Product Specifications 3 4 CHA42 7L 5 7L ...
Page 14: ...5 Disassembly and Reassembly 5 2 CHA42 7L 5 7L Memo ...
Page 62: ...9 Electrical Parts List 9 14 CHA42 7L 5 7L Memo ...