Samsung CGP1607 Troubleshooting

SyncMaster 1000s (CGP1607L) 7-1

7 Troubleshooting

7-1 Parts Level Board Repair Section

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, H/V control circuit, and H/V output circuit.

• High voltage develops but no raster appears: Video output circuits.

• High voltage does not develop: Horizontal output circuits.

7-1-1 No Power Supply

Does power supply make chirping

noise?

Check and replace Q604, Q607, T601

and D634.

Check and replace FH601, D601.

Verify voltages.

Done.

No

Yes

Does the IC601 Pin 1

waveform correct?

Check and replace IC601, OP602,

IC604 and D606.

Yes

No

Do OP602, IC604 and
D606 work normally?

Relace parts and verify voltages.

Yes

No

Is the power board work well?

Replace power board.

Yes

No

WAVEFORMS

2

552 V (IC601, #1))

CH1 P-P = 552 V CH1 RMS = 323 V

2

7 Troubleshooting

7-2 SyncMaster 1000s (CGP1607L)

7-1-2 DPMS Failure

Make No H/Vsync signal from

signal source. (Power off mode)

Check H/V_sync signal and Video

level of signal source.

Is Amber LED blinking?

Check IC201 Pin 31.

Yes

No

Is the +12 V line off?

Check IC201 Pin 1 and Q417, IC405.

Yes

No

Is the Q608 Base input correct?

Check Pin 2 of IC201 and Q608.

Yes

No

Is the Q602 Base Input correct?

Refer to 7-1-1 No Power Supply.

Done

Yes

No

7 Troubleshooting

SyncMaster 1000s (CGP1607L) 7-3

7-1-3 H_Deflection Failure

Is the IC401 Pin 6

waveform correct?

Is the Q405 source
waveform correct?

Check Q405, R419, R423, D405 and

+195 V line.

Yes

Yes

No

Check R401 (+12 V line), IC401 Pins

5, 6 and 7 and replace IC401.

No

Do the Q406 gate and

drain waveforms
match #18, #28?

Check Q406, D409 and +80 V line.

Yes

No

Do the Q407 base and

collector waveforms

match #29?

Check and replace Q407, D413 and

DY connector connection.

Yes

No

IC403 Pin 4 waveform is right?

Replace IC403.

Check some parts around

Q415 and Q416.

Check some parts around Q413.

Yes

No

Does the IC403 Pin 26
waveform match #44?

Check some parts around IC403.

Yes

No

WAVEFORMS

26

27

18

28

29

43

44

14.16 V (H_DRIVE)

CH1 P-P = 14.16 V CH1 RMS = 8.1 V

18

1.160 kV (Q407, Collector)

CH1 P-P = 1.160 kV CH1 RMS = 300 V

29

13.28 V (IC401, #6)

CH1 P-P = 13.28 V CH1 RMS = 7.5 V

26

216 V (T402, #6)

CH1 P-P = 216 V CH1 RMS = 151 V

27

51.6 V (Q406, Drain)

CH1 P-P = 51.6 V CH1 RMS = 22.6 V

28

3.48 V (IC403, #4)

CH1 P-P = 3.48 V CH1 RMS = 2.898 V

43

12.40 V (IC403, #26)

CH1 P-P = 12.40 V CH1 RMS = 8.188 V

44

7 Troubleshooting

7-4 SyncMaster 1000s (CGP1607L)

7-1-4 S Correction Failure

Are the S1~S5 signals at each

frequency block correct?

Check S1 ~ S5 signal.

Check and replace Q408~Q412, Q414,

C434, C435, C436, C437 and C438.

Yes

7-1-5 H_Lin. Failure

Does the IC201 Pin 4 voltage vary

with different H_Lin. DAC values?

Does the IC402 Pin 4 voltage vary

with different H_Lin. DAC values?

Check +12 V, –14 V line and some

parts around IC402.

Check L406.

Yes

Yes

No

Check and replace IC201.

No

Replace IC201.

No

7-1-6 Invariable H_Size

Does the IC403 Pin 28 voltage vary
with different H_Size DAC values?

Does the IC401 Pin 6 output

duty vary with different H_Size

DAC values?

Check some parts around IC401

and IC403 Pin 28.

Yes

No

Check and replace IC403.

No

7 Troubleshooting

SyncMaster 1000s (CGP1607L) 7-5

7-1-7 Abnormal H_Size

Does the IC201 Pin 5 output

duty vary with different B+ offset

DAC values?

Does the T402 Pin 8

waveform match #14?

Check and replace T402.

Check some parts around D408.

Yes

Yes

No

Check and replace IC201, some

parts IC201 Pin 5,

IC403 Pin 28 and IC401 Pin 2.

No

7-1-8 Side Pin or Trap Failure

Does the IC403 Pin 24 output

match #16?

Yes

Check and replace IC403.

Replace IC403.

Check and replace IC401.

Check some parts IC401 Pin 2

and IC403 Pin 24.

7-1-9 Para. or Pin Balance Failure

Does the IC403 Pin 5 output vary

with different DAC values?

Yes

Done.

No

No

WAVEFORMS

WAVEFORMS

14

16

3.32 V (IC403, #12)

CH1 P-P = 3.32 V CH1 RMS = 0.83 V

14

1.64 V (IC403, #24)

CH1 P-P = 1.64 V CH1 RMS = 3 V

16

7 Troubleshooting

7-6 SyncMaster 1000s (CGP1607L)

7-1-10 Tilt Failure

Does the IC201 Pin 6 output duty

vary with different DAC values?

Does the IC404 Pin 3 output vary

with different DAC values?

Check and replace IC404, +12 V line

and –12 V line.

Check and replace CRT.

Yes

Yes

No

Check and replace IC201.

No

Check tilt connector connection at

CN405.

7-1-11 V Deflection Failure

Is the +14 V, –12 V line DC

output correct?

Does the IC403 Pin 23 output

waveform match #17?

Check and replace IC403.

Yes

Yes

No

Refer to 7-1-1 No Power Supply.

No

Does the IC301 Pin 1 input

waveform match #8?

Check and replace IC301.

Yes

No

Does the IC301 Pin 5 output

waveform match #7?

Check and replace some parts

around IC301.

Yes

No

Check V-DY connector connection

CN301.

WAVEFORMS

17

8

7

54.8 V (IC301, #5)

CH1 P-P = 54.8 V CH1 RMS = 6.4 V

7

2.62 V (V_RAMP)

CH1 P-P = 2.62 V CH1 RMS = 0.45 V

8

4.16 V (IC403, #23)

CH1 P-P = 4.16 V CH1 RMS = 3.5 V

17