Samsung DP17L Series User manual

COLOR MONITOR
DP17L*
(For implementing TDA9113)
Manual
SUPPLEMENT-1
SERVICE
COLOR MONITOR CONTENTS
EXIT
EXIT MENU
1. Troubleshooting
2. Electrical Parts List
3. Schematic Diagrams
Supplementto the Service Manual DP17L*
This supplement contains information which differs from service manual DP17LS/LT
Use both this supplement and service manual part number BH68-00129A.

Samsung Electronics Co., Ltd. October 2000
Printed in Korea
P/N : BH68-00129A-02

Copyright
© 2000 by Samsung Electronics Co., Ltd.
All rights reserved.
This manual may not, in whole or in part, be
copied, photocopied, reproduced, translated, or
converted to any electronic or machine readable
form without prior written permission of
Samsung Electronics Co., Ltd.
DP17L* Service Manual
First edition October 2000.
Printed in Korea.
Trademarks
Samsung is a registered trademark and
DP17L* and MacMaster Cable Adapter are
trademarks of Samsung Electronics Co., Ltd.
Macintosh, Centris, Quadra, Duo Dock, and
Power Macintosh are trademarks of Apple
Computer, Inc.
All other trademarks are the property of their
respective owners.
ii DP17L*

DP17L* 1-1
1 Troubleshooting
1-1 Parts Level Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
1-1-1 No Power Supply
Chirping noise exists? Check and replace IC601.
Check and replace D601, FH1
Done.
No
Yes
Repeating start? Check and replace D606.
No
Yes
IC601 Pin 1 waveform is right? Check and replace D614, IC601,
Q602, ZD601.
Yes
No
C622 Voltage is 13 V ± 0.5V? Check and replace IC201, IC301,
IC401, Q402, Q404.
Yes
No
Normal operation Replace Main board.
Yes
Verify voltages.
Yes
No
WAVEFORMS
1
1100 V (IC601, #1)
CH1P-P=100V CH1RMS=350.2V

1 Troubleshooting
1-2 DP17L*
1-1-2 DPMS Failure
Make No H/V sync (power off
mode)
Check signal source
H/V sync video level.
LED blinks Check IC201 Pin 40.
Yes
No
+12 V line off Check IC201 Pin 5.
Yes
No
IC602 Pin 4
voltage exists? Check IC201 Pin 6.
Check and replace IC602.
No
Yes
IC601 Pin 1 output
voltage exists? Refer to 1-1-1 No Power Supply.
Done
Yes
No
WAVEFORMS
2
2100V (IC601, #1)
CH1P-P=100V CH1RMS=325.8V

1 Troubleshooting
DP17L* 1-3
1-1-3 H_Deflection Failure
Does Horizontal paluse signal
appear at at Pin 26 of IC401? Check IC401.
Yes
No
Does 20 Vp-p signal appear
at Collector of Q403? Check Q403.
No
No
Check Q402, Q404, T401.
WAVEFORMS
4
32.00 V (IC401, #28)
CH1P-P=2.00V CH1RMS=5.868V
41.00V (IC401, #26)
CH1P-P=1.00V CH1RMS=1.298V
520.0 V (Q403, Collector)
CH1P-P=20.0V CH1RMS=46.80V
Does PWM output signal appear
at Pin 28 (H_out) of IC401?
Check IC401.
Check 12V line.
Yes
No Does DC 12V appear at
Pin 29 of IC401?
Yes
No
3
1-1-4 S Correction Failure
S1~S3 signals are right at each
frequency block?
Check S1 ~ S3 signal.
Check and replace Q404, Q409, Q410,
Q411,Q414, Q415, Q416
Yes
Check and replace IC201.
No
5

1 Troubleshooting
1-4 DP17L*
1-1-5 H_Lin. Failure
IC201 Pin 21 voltage varies with
different H_Lin. DAC values?
IC603 Pin 9 voltage varies with
different H_Lin. DAC values? Check +12 V, –10 V line.
Check some parts around IC603.
Check Q412, Q413, T402.
Yes
Yes
No
Replace IC201.
No
1-1-6 Invariable H_Size
IC401 Pin 28 voltage varies with
different B_Out DAC values?
Q402 Gate output duty varies with
different B_Out DAC values? Check some parts around Q402,
IC401 Pin 16, 24.
Yes
No
Check and replace IC401.
No
1-1-7 Abnormal H_Size
IC401 Pin 24 output duty
varies with different B+ offset
DAC values?
Q408 Collector waveform is
right? Check and replace Q405, Q406, Q407,
Q408.
Check some parts around D409, L401.
Yes
Yes
No
Check and replace IC201.
No WAVEFORMS
6
6200 V (Q408, Collector)
CH1P-P=200V CH1RMS=387.2V

1 Troubleshooting
DP17L* 1-5
1-1-8 Side Pin or Trap Failure
IC401 Pin 24 output exists?
Yes
Check and replace IC401.
Refer to 5-1-7 Abnormal H_Size.
1-1-9 Para. or Pin Balance Failure
IC401 Pin 24 output varies with
different DAC values?
No
Replace IC401.
No WAVEFORMS
771.00 V (IC401, #24)
CH1P-P=1.00V CH1RMS=3.008V
1-1-10 Tilt Failure
IC201 Pin 20 output duty varies
with different DAC values?
IC603 Pin 13 output varies with
different DAC values? Check and replace IC603.
Check and replace Q301, Q302.
Yes
Yes
No
Check and replace IC201.
No
Check tilt connector connection
Refer to 5-1-7 Abnormal H_Size.
Yes

1 Troubleshooting
1-6 DP17L*
1-1-11 V Deflection Failure
13 V, –10 V line is on?
IC401 Pin 23 output exists? Check and replace IC401.
Yes
Yes
No
Refer to 1-1-1 No Power Supply
No
IC301 Pin 6 output exists? Check and replace some parts
around IC301.
Yes
No
Check DY connector connection.
WAVEFORMS
8
9
8500 V (IC401, #23)
CH1P-P=500V CH1RMS=1.425V
910.0 V (IC301, #6)
CH1P-P=10.0V CH1RMS=5.06V
1-1-12 V Size or Pos. Variation Failure
IC401 Pin 23 output varies with
different DAC values?
Yes
Check and replace IC201, IC401.
Check and replace IC301.
No

1 Troubleshooting
DP17L* 1-7
1-1-13 High Voltage Failure
IC401 Pin 28 OSC pulse exists?
Q402 Gate driving pulse exists? Check and replace Q401.
Yes
Yes
No
Check and replace IC401
and +12 V line.
No
Q402 Drain pulse exists? Check and replace Q403,
L402.
Yes
No
Done
WAVEFORMS
10
3
10 2.00 V (Q402, Gate)
CH1P-P=2.00V CH1RMS=7.692V
32.00 V (IC401, #28)
CH1P-P=2.00V CH1RMS=5.868V
11 50.0 V (Q402, Drain)
CH1P-P=50.0V CH1RMS=73.7V
IC101 Pin 12 input exists and
varies with different patterns? Check and replace IC101.
Input full white pattern to monitor.
No
Yes
No
T501 Pin 8 output exists? Check and replace T501.
Yes
No
IC201 Pin 26 output exists and
varies with different patterns? Check and replace IC201.
Yes
No
Done
Check CN102.
1-1-14 ABL Failure
11