7 Troubleshooting
CHA42*7L/5**7L
7-15
Are D505, C502, R506, R503 and
C445 ok?
Yes
Check and replace it.
No
Symptoms 2: – X-ray protection
– One vertical line and then high voltage shut down.
Check and replace
Q402, Q508,
D409, D408, D403, IC401.
Check and replace
Q203, IC202.
Is 5 V on IC401’s Pin 32 and
IC203’s Pin 8?
Check and replace it.
No
Yes
Is there data communication on
IC401’s Pins 30 and 31?
No
Yes
Is there data communication
on IC401’s Pins 30 and 31 during
I
2
C function? (H/V Posi, V_Size,
S_Pin, Trap, Cont, Brit)
Check I
2
C data and clock line.
Check and replace I
2
C devices.
(IC101, IC401, IC203)
No
Yes
Done
14
14
7-2-13 I
2
C Failure
– Almost data (Horizontal drive duty, FBT B+ duty, display image data, color data) is transferred
from IC203 to IC101 and IC401 through I2C data line during power on.
– After user adjusts display image data, contrast and brightness data, these are saved to IC203.
Key check (7-2-18)
WAVEFORMS
14
5.92 V (IC203, #5, 6)
CH1 P-P = 5.92 V
CH1 RMS = 3.812 V
CH1 : IC401’s Pin 31
CH2 : IC401’s Pin 30
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 ...