7 Troubleshooting
7-18
CHA42*7L/5**7L
7-2-16 No Video
Is heater voltage (5.9~6.3V) on
SK103’s heater Pin?
Replace it.
No
Check and replace Q604, R621.
Yes
Are D617, Q603 and R631 ok?
No
Yes
Check and replace
Q603, R624, R625.
Is 0V on Q604’s collector?
No
Yes
Check and replace
IC202.
Is 5V on IC202’s Pin 8
No
Yes
Replace IC101.
Refer to 7-2-1
No Power.
Opening BD102, is it
short between IC101’s Vcc and
ground?
No
Yes
Check signal cable connection.
Check Cont, Brit key (All max).
Is G1 voltage OK at
SK103’s G1 Pin?
Check and replace
SK102,
C119,
Q504, D510, R513,
R521, R520,
D513, T501.
Check CN103’s connection (G2).
No
Yes
WAVEFORMS
17
Desoldering SK101 and C118,
is G2 voltage ok?
Check and replace
SK101, C118
and then T501.
No
Yes
Is 12 V on IC101’s Pins 1 and 7?
No
Check and replace
IC202 and around it.
Is clamp signal on IC101’s
Pin 12?
No
Is IC101’s output on Pins 18,
21 and 23?
No
Yes
17
35.2 V (SK103, G1)
CH1 P-P = 35.2 V
CH1 RMS = 80.84 V
15
18
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 ...