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

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.

Yes

Repeating start? Check and replace D606.

Yes

IC601 Pin 1 waveform is right? Check and replace D614, IC601,

Q602, ZD601.

Yes

C622 Voltage is 13 V ± 0.5V? Check and replace IC201, IC301,

IC401, Q402, Q404.

Yes

Normal operation Replace Main board.

Yes

Verify voltages.

Yes

WAVEFORMS

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

+12 V line off Check IC201 Pin 5.

Yes

IC602 Pin 4

voltage exists? Check IC201 Pin 6.

Check and replace IC602.

Yes

IC601 Pin 1 output

voltage exists? Refer to 1-1-1 No Power Supply.

Done

Yes

WAVEFORMS

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

Does 20 Vp-p signal appear

at Collector of Q403? Check Q403.

Check Q402, Q404, T401.

WAVEFORMS

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

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.

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

Replace IC201.

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

Check and replace IC401.

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

Check and replace IC201.

No WAVEFORMS

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?

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

Check and replace IC201.

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

Refer to 1-1-1 No Power Supply

IC301 Pin 6 output exists? Check and replace some parts

around IC301.

Yes

Check DY connector connection.

WAVEFORMS

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.

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

Check and replace IC401

and +12 V line.

Q402 Drain pulse exists? Check and replace Q403,

L402.

Yes

Done

WAVEFORMS

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.

Yes

T501 Pin 8 output exists? Check and replace T501.

Yes

IC201 Pin 26 output exists and

varies with different patterns? Check and replace IC201.

Yes

Done

Check CN102.

1-1-14 ABL Failure

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