7 Troubleshooting
7-20
CHA42*7L/5**7L
Check if timing is out of spec or not.
Key check (all key) : Refer to 7-2-19.
Check the connection of signal cable.
If signal cable is disconnected, self raster (No Video, Bright Raster) appears.
If there is no H/V sync, monitor is operated as DPMS mode.
If out of sepc, monitor is operated as stand-by mode. (No Video, LED: 0.5 sec toggle)
14”: Horizontal 30 ~ 55 kHz, Vertical 50 ~ 125 Hz
15”: Horizontal 30 ~ 61 kHz, Vertical 50 ~ 125 Hz
Check H/V sync from PC or signal
generator.
Are oscillation (8 MHz) on
IC202’s Pins 34 and 35?
Check and replace X201, C205 ,C206.
Yes
No
7-2-17 Micom Failure
Refer to 7-2-1
No Power.
Is 13 V on C627?
No
Is 5V on IC202’s Pins 9 and 35?
No
Cceck and replace
R201, IC202,
Signal cable.
When disconnecting signal
cable: Is 0V on IC202’s Pin 13?
When connecting signal cable:
Is 5V on IC202’s Pin 13?
No
Are H/V sync input on
IC202’s Pins 29 and 30?
Yes
20
Check reset part.
Are Q204, C223 and R210 ok?
Replace it.
Yes
No
Check power key (IC202’s Pin 2).
Normal : 5 V, Pressing key : 0 V
Check and replace SW211, IC202.
Yes
No
Check and replace IC603.
Yes
Yes
24 25
WAVEFORMS
20
4.92 V (IC202, #33)
CH1 P-P = 4.92 V
CH1 RMS = 2.912 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 ...