7 Troubleshooting
7-6
CHA42*7L/5**7L
7-2 Detail Repair Section
Notes:
1. If a picture does not appear
check first
• if AC power cord is plugged or not,
• if signal cable is connected or not,
• if signal generator (PC) is operated well or not (DPMS mode)
• if the Timing mode is out of spec or not (14”: 30~55 kHz, 15”: 30~61 kHz)
Does recitfied voltages of
secondary part appear on C617,
C620, C627, C632?
Refer to 7-2-3 No Raster and
7-2-12 High Voltage Failure.
Check and replace
Q402, Q508,
D403, D408, D409,
IC101,
Q410
Yes
Are D608, D611, D620, D615,
D616 and D617 OK?
Replace it.
Check and Replace OP601,
IC601,
T602.
Check and replace
IC602, D614,
R616, D619, D618, OP601,
IC601, T602.
No
No
Does rectified voltage
(1.4 x AC input) of primary part
appear on C617?
Check and replace
FH601,
TH602, D604~D607.
Yes
Yes
No
Is IC602’s Pin 1 OK?
No
Yes
Yes
Is IC602’s Pin 5 OK?
Yes
No
Yes
Does rectified voltage
(1.4 x AC input) of primary
part appear on C617?
No
7-2-1 No Power
Desolder IC602’s Pin 1.
Check and replace
IC602,
T601.
Check and replace T601 and
around parts.
No
WAVEFORMS
1
2
1
410 V (IC602, #1)
CH1 P-P = 410 V
CH1 RMS = 332.8 V
2
8.40 V (IC602, #5)
CH1 P-P = 8.40 V
CH1 RMS = 4.680 V
Содержание CHA4217L
Страница 2: ...Samsung Electronics Co Ltd August 1998 Printed in Korea Code No BH68 61127A ...
Страница 10: ...Memo 3 Product Specifications 3 4 CHA42 7L 5 7L ...
Страница 14: ...5 Disassembly and Reassembly 5 2 CHA42 7L 5 7L Memo ...
Страница 62: ...9 Electrical Parts List 9 14 CHA42 7L 5 7L Memo ...
Страница 64: ...Memo 10 Block Diagrams 10 2 CHA42 7L 5 7L ...