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

1 Troubleshooting
1-8 DP17L*
1-1-15 Dynamic Focus Failure
IC401 Pin 32 output is right?
Some parts around Q551 are right? Replace failed part.
Yes
Yes
No
Replace the IC401.
No
T502 Pin 6 input is right? Check and replace C432.
Yes
No
T502 Pin 1 output is right? Replace the T502.
No
No
Check the connection between FBT
Focus pin, CRT Socket PCB.
WAVEFORMS
13
14
12 12 2.00 V (IC401, #32)
CH1P-P=2.00V CH1RMS=6.124V
13 50.0 V (T502, #6)
CH1P-P=50.0V CH1RMS=75.6V
14 100 V (T502, #1)
CH1P-P=100V CH1RMS=124.0V

1 Troubleshooting
DP17L* 1-9
1-1-16 No Video
IC101 Pin 5, 8 and 10 inputs
are right?
IC101 Pin 21, 24 and 26
outputs are right? Check I2C bus and +12 V line.
Yes
Yes
No
Check the signal cable connection.
No
IC103 Pin 1, 2 and 3 outputs
are right? Check +12 V, +72 V line.
Check and replace IC103.
Yes
No
Cathode DC levels are right? Check +72 V line.
Check and replace QR01, QR02,
QG01, QG02, QB01, QB02.
Yes
No
G2 voltage is right? Check G2 wire, CRT Socket board,
and FBT.
Change CRT.
Yes
Done.
No
Check signal cable and connection. WAVEFORMS
15
16
17
15 1.00 V (IC101, #5, 8, 10)
CH1P-P=1.00V CH1RMS=2.452V
16 1.00 V (IC101, #21,24,26)
CH1P-P=1.00V CH1RMS=2.792V
17 20.0 V (IC103, #1, 2, 3)
CH1P-P=20.0V CH1RMS=40.52V

1 Troubleshooting
1-10 DP17L*
1-1-17 Micom Failure
IC201 Pin 11 input voltage is 5V?
IC201 Pin 13 and 14 inputs
are right? Check C202, C203, X201.
Yes
Yes
No
Check IC604.
No
IC201 Pin 18 input is right? Check IC605.
Yes
No
All in/output values are right? Replace IC201.
No
No
Done
WAVEFORMS
18
18 1.00 V (IC201, #13, 14)
CH1P-P=1.00V CH1RMS=2.108V

1 Troubleshooting
DP17L* 1-11
1-1-18 OSD Failure
IC104 Pin 6 input is right?
IC104 Pin 17 input is right? Check and replace Q101.
Check CN102 Pin 8.
Yes
Yes
No
Check and replace Q102.
Check CN102 Pin 14.
No
IC104 Pin 7 and 8 inputs are right? Check IC201 Pin 41 and 42.
Yes
No
IC104 Pin 12, 13 and 14
outputs are right? Check and replace IC104.
No
No
IC101 Pin 21, 24 and 26
outputs are right? Check and replace IC101.
Check and replace IC103.
Yes
Done
No
Check CN104 and connector Ass’y. WAVEFORMS
19
20
21
19 1.00 V (IC104, #6)
CH1P-P=1.00V CH1RMS=4.516V
20 1.00 V (IC104, #17)
CH1P-P=1.00V CH1RMS=5.024V
21 1.00 V (IC101 #21,24,26)
CH1P-P=1.00V CH1RMS=2.580V

1 Troubleshooting
1-12 DP17L*
1-1-19 User Control Failure
Does the DC level change at
Pin 36 of IC201 when you push the
button S/W?
Yes
Check the button.
(SW201 ~ SW204)
No
Check IC201.
RL601 operation is right?
Q601 base input is right? Check and replace Q601.
No
No
Yes
Check D-coil and TH601.
Yes
IC201 Pin 4 output is right? Check and replace IC201.
Yes
No
Done
Check degaussing connector.
1-1-20 Degaussing Failure

1 Troubleshooting
DP17L* 1-13
1-2 General Troubleshooting
1-2-1 No Picture
LED blinks?
LED is green color? Check Micom.
Check G2 voltage, high voltage,
R, G, B cathode voltage.
Yes
No
No
Refer to 1-2-2 Shut down.
Yes
1-2-2 Shut Down
Blinking LED’s?
Scan failure Check horizontal, vertical deflection
system and check power supply
secondary voltages.
Yes
Yes
Check power supply.
No
Check and replace IC201.
Done
No
Video failure? Check Video board.
No
Yes

1 Troubleshooting
1-14 DP17L*
1-2-3 Missing Color
Are proper Video levels
on CN101 (D-Sub) Pin 1, 3 and 5?
Are proper Video signal on all
cathodes? Refer to 1-1-16 No Video.
Yes
Yes
No
Check signal generator.
No
Are proper DC voltage on all
cathodes?
Check IC101 Pins 15, 16 and 17.
Check QR01, QR02, QG01, QG02,
QB01, and QB02.
Yes
Yes
No
Is G2 voltage right? Check D502, D503 and Q501.
No
Is Heater voltage right? Check D608, Q604 and T601.
No
Yes
Check D504, Q602 and T501.
No
Yes
Yes
Yes
Is G1 voltage right? No
Replace CRT.
Done
22
WAVEFORMS
22 10.0 V (R,G,B, Video)
CH1P-P=10.0V CH1RMS=17.02V

1 Troubleshooting
DP17L* 1-15
Is G2 voltage right?
Is blank pulse on Pin 17 of IC401? Check IC401.
Yes
Yes
No
Check D502, D503, Q501,
and adjust G2.
No
Is V_FLB pulse on
Collector of Q303? Check Q303.
Done
Yes
No
Does approve the Vertical pulse
on the CRT Socket G1? Check CN102 and CN201.
Yes
No
Check white balance adjustment.
1-2-4 Visible Retrace
23
24
WAVEFORMS
23 5.00 V (Q303, Collector)
CH1P-P=5.00V CH1RMS=28.33V
24 20.00 V (CRT, G1)
CH1P-P=20.0V CH1RMS=66.68V

1 Troubleshooting
1-16 DP17L*
Are signals right?
Signals at Pin 28 and 29 of
IC201 are right? Check IC201.
Yes
Yes
No
Check Video Cable.
No
Signals at Pin 1 and 2 of
IC401 are right? Check IC401.
Check circuits on Main board.
Yes
Done
No
Check input signals Pin 2
and 3 of CN202.
1-2-5 Unsynchronized Image

1 Troubleshooting
DP17L* 1-17
Is the convergence now
within spec?
Readjust convergence.
No
Done
Yes
Is the convergence now
within spec? Done
Change CRT and readjust
convergence.
No
Done
Yes
Try readjusting convergence.
1-2-6 Misconvergence