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7 Troubleshooting
CHA42*7L/5**7L
7-13
7-2-10 Vertical Deflection Failure
Are +13 V, –12 V line OK?
Is V_out waveform on IC401’s
Pin 23?
Yes
Check and replace
D616, D608,
IC301,
IC302.
No
Symptoms: – One horizontal line
– Rainbow color, No Video
Check and replace
R314, R315,
IC401.
No
Is V_deflection waveform on
IC301’s Pin 5?
Check and replace IC301, R312, R310,
and some parts around it.
Check and replace
IC401.
Yes
Is 8 V on IC401’s Pin 21?
No
Yes
No
Yes
Refer to 7-2-13 I
2
C Failure.
10
9
7-2-11 Invariable V_Size or V_Position
Key check (7-2-18)
Refer to 7-2-13 I
2
C Failure.
Does V_Out (IC401’s Pin 23) vary,
pressing V_Size or V_Posi key?
Check and replace IC301 and some
parts around it.
No
Yes
WAVEFORMS
10
50.8 V (IC301, #5)
CH1 P-P = 50.8 V
CH1 RMS = 7.04 V
9
3.16 V (IC401, #23)
CH1 P-P = 3.16 V
CH1 RMS = 3.686 V
9
WAVEFORMS
9
3.16 V (IC401, #23)
CH1 P-P = 3.16 V
CH1 RMS = 3.686 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 ...