Samsung GH15ES Service Manual Download Page 16 | Manualshive

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4 Troubleshooting

GH15LS/GH15ES/GH15MS

4-5

4-5 No SOUND (GH15MS)

No

Does the DC 12V appear

at Pin 15, 16 of IC401 and

Pin 5, 6, 7, 8 of Q403?

Check Q403, Q401 and related circuit.

Yes

Check CN402 outputs.

No

Does the sound signal appear at

Pin 14 and 17 of IC401?

Check IC401 and related circuit.

Yes

No

Does the sound input signal

appear at Pin 4 and 9 of IC401?

Check CN401

and related circuit.

Yes

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Summary of Contents for GH15ES

Page 1: ...TFT LCD MONITOR CONTENTS 1 Precautions 2 Product Specifications 3 Disassembly Reassembly 4 Troubleshooting 5 Exploded View Parts List 6 Electrical Parts List 7 Block Diagram 8 Wiring Diagram 9 Schematic Diagrams 10 Panel Description GH15LS GH15ES GH15MS ...

Page 2: ...iances and Underwriters Laboratories UL Publication UL1410 59 7 Figure 1 1 Leakage Current Test Circuit 4 With the unit completely reassembled plug the AC line cord directly into a 120V AC outlet With the unit s AC switch first in the ON position and then OFF measure the current between a known earth ground metal water pipe conduit etc and all exposed metal parts including metal cabinets screwhead...

Page 3: ...witch ON Connect an insulation resistance meter 500 V to the blades of the AC plug The insulation resistance between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 6 Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead last 6 Do not remove a...

Page 4: ...391 4 x 292 8 x 64 0 mm 16 5 x 11 7 x 2 5 Inches 417 9 x 297 9 x 64 2 mm With Pivot Stand 15 4 x 15 1 x 6 8 Inches 391 4 x 383 6 x 173 mm 16 5 x 15 2 x 6 8 Inches 417 9 x 386 1 x 173 mm 15 4 x 17 1 x 6 8 Inches 391 4 x 433 6 x 173 mm 16 5 x 17 2 x 6 8 Inches 417 9 x 436 1 x 173 mm Without Pivot Stand 15 4 x 11 5 x 2 5 Inches 391 4 x 292 8 x 64 0 mm 16 5 x 11 7 x 2 5 Inches 417 9 x 297 9 x 64 2 mm ...

Page 5: ...4 15 Red Green Blue GND GND DDC Return GND R GND G GND B No Connection GND Sync Self Test GND DDC Data H Sync V Sync DDC Clock Red Green Blue GND GND DDC Return GND R GND G GND B No Connection GND Sync Self Test GND DDC Data H V Sync Not Used DDC Clock Red Green H V Sync Blue GND GND DDC Return GND R GND G GND B Not Used GND Sync Self Test GND DDC Data Not Used Not Used DDC Clock ...

Page 6: ...ack porch R Active time E Front porch S Front porch VGA3 60 Hz 640 x 480 640 72 Hz 640 x 480 640 75 Hz 640 x 480 800 56 Hz 800 x 600 800 60 Hz 800 x 600 VGA1 70 Hz 640 x 350 VGA2 70 Hz 720 x 400 Table 2 1 Timing Chart 31 469 31 777 3 813 1 589 26 058 0 318 70 087 14 268 0 064 0 858 13 155 0 191 28 322 Negative Positive Separate 31 469 31 778 3 813 1 589 26 058 0 318 59 940 16 683 0 064 0 794 15 76...

Page 7: ...e Separate 49 726 20 110 1 117 3 910 14 524 0 559 74 551 13 414 0 060 0 784 12 549 0 020 57 284 Negative Negative Separate Mode MAC Timing Q R S P O Video Sync Sync Horizontal Vertical C D E P O B A Video Sync Sync Separate Sync C D A O E B P Video Sync Sync Video Q R S A Line time total B Horizontal sync width O Frame time total P Vertical sync width C Back porch D Active time Q Back porch R Acti...

Page 8: ...n PCB 3 1 3 Standard Stand Disassembly 1 Remove 2 screws from the Stand front 2 Remove 7 screws from the Stand Bottom 3 Remove Stand Rear from the Stand assembly 4 Remove 5 screws from the Stand assembly 5 Remove the Neck front from the Stand assembly 6 Remove 2 screws from the Stand assembly 7 Remove Neck Rear from the Stand assembly 8 Remove 4 screws from the Stand assembly GH15LS GH15ES GH15MS ...

Page 9: ...here is nothing on the disk Turn the LCD module over and put it on a flat desk set to the ground 3 2 Replacement Order of Lamp Assemblies GH15LS GH15ES GH15MS Samsung Panel 2 Push down the stopper and slide the lamp unit 3 Please take out the lamp unit from the LCD module ...

Page 10: ...ease fix the new lamp units on the LCD module opposite process 2 and 3 Replacement of lamp unit should be done at the power off state and recommanded clean bench condition 3 3 Reassembly Reassembly procedures are in the reverse order of Disassembly procedures ...

Page 11: ...Memo 3 Disassembly and Reassembly 3 4 GH15LS GH15ES GH15MS ...

Page 12: ...circuits No raster appears Audio PCB SMPS PCB Main PCB 12V develop but no screen Main PCB 12V does not develop Audio PCB SMPS PCB 4 If you push and hold the EXIT button for more than 5 seconds the monitor automatically turns back to the factory preset 4 1 No Power GH15LS GH15ES GH15MS Does proper DC 12 V appear at FT901 FT902 or Pin 1 2 of CN101 Check SMPS or CN101 Yes No Does proper DC 3 3 V appe...

Page 13: ... V sync pulse appeaer at Pin 30 of IC301 2 Replace IC301 or check its related circuit No Yes Does the V sync pulse appeaer at Pin 148 of IC105 3 Replace IC105 or check its related circuit No Yes No Yes Replace IC251 or check its related circuit No Yes Replace LCD Panel Yes 1 4 2 No Video Does the clock pulse appeaer at Pin 44 of IC105 5 Do the pulse appeaer at Pin 43 of IC105 6 Does the waveforms ...

Page 14: ...4 Troubleshooting GH15LS GH15ES GH15MS 4 3 1 5 6 7 2 3 4 WAVEFORMS ...

Page 15: ...801 SW808 Yes Refer to 4 4 No OSD Display 4 4 No OSD There is video but no OSD While pushing a front control button does any pulse appear at Pin 46 47 and 55 56 and 63 64 of IC105 5 No Do sync signals appear at Pin 44 150 and 43 of IC105 1 Replace IC105 3 Yes Replace IC105 or check its related circuit Replace IC105 or check its related circuit 2 Replace CN251 Replace IC251 and IC252 Yes No 5 ...

Page 16: ...Pin 15 16 of IC401 and Pin 5 6 7 8 of Q403 Check Q403 Q401 and related circuit Yes Check CN402 outputs No Does the sound signal appear at Pin 14 and 17 of IC401 Check IC401 and related circuit Yes No Does the sound input signal appear at Pin 4 and 9 of IC401 Check CN401 and related circuit Yes ...

Page 17: ...ction between the PC and monitor secure Connect the cable between the PC and monitor Yes OK No Can you hear any sound from the Headphones Check CN802 on the Audio PCB and related circuit D805 D806 R811 and R812 Yes No Is the Internal Microphone connector attached Check the connection between CN808 on the Audio PCB and the Internal Microphone Yes No Does the Internal Microphone work Check Q801 and ...

Page 18: ...GH15LS GH15ES GH15MS 5 1 5 Exploded View and Parts List 5 1 GH15LS GH15ES ...

Page 19: ...5 Exploded View Parts List 5 2 GH15LS GH15ES GH15MS 5 2 GH15MS ...

Page 20: ...203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 C133 2203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 C134 2203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 C135 2203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 C136 2203 000257 C CERAMIC CHIP 10nF 10 50V X7R TP 1608 C137 2203 005005 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C138 2203 005005 C CERAMIC CHIP 100nF 10 16V X7R TP 1608 C139 2402 00...

Page 21: ...3 000236 C CERAMIC CHIP 0 1nF 5 50V NP0 TP 1608 CN201 3711 003161 CONNECTOR HEADER BOX 20P 1R 1 25mm ANGLE SN SNA CN301 3711 000556 CONNECTOR HEADER BOX 12P 1R 1 25mm SMD A SN SNA CN302 3711 002049 CONNECTOR HEADER BOX 6P 1R 1 25mm SMD A SN SNA D131 0401 001056 DIODE SWITCHING MMBD4148SE 75V 200MA SOT 23 TP D132 0401 001056 DIODE SWITCHING MMBD4148SE 75V 200MA SOT 23 TP D133 0401 001056 DIODE SWIT...

Page 22: ...IP 4 7Kohm 5 1 16W DA TP 1608 R188 2007 000090 R CHIP 10KOHM 5 1 16W DA TP 1608 R189 2007 000084 R CHIP 4 7Kohm 5 1 16W DA TP 1608 R190 2007 000090 R CHIP 10KOHM 5 1 16W DA TP 1608 R203 2007 000074 R CHIP 100ohm 5 1 16W DA TP 1608 R204 2007 000074 R CHIP 100ohm 5 1 16W DA TP 1608 R205 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 R207 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 R301 2007 000078 R CHIP...

Page 23: ...08 R919 2007 000070 R CHIP 0ohm 5 1 16W DA TP 1608 R973 2007 000075 R CHIP 220ohm 5 1 16W DA TP 1608 R974 2007 000120 R CHIP 680ohm 5 1 16W DA TP 1608 R975 2007 000090 R CHIP 10KOHM 5 1 16W DA TP 1608 R976 2007 000090 R CHIP 10KOHM 5 1 16W DA TP 1608 RA130 2011 000002 R NETWORK 22ohm 5 63mW L CHIP 8P TP RA131 2011 000002 R NETWORK 22ohm 5 63mW L CHIP 8P TP RA132 2011 000002 R NETWORK 22ohm 5 63mW ...

Page 24: ...BN39 00114A CBF SIGNAL NL15MO 15P 15P 2990 1830MM UL2990 IVORY D SUB MALE GH15LS ES MS BN59 00167A PBA SUB FUNCTION GH15MS GH15_FUNCTION GH15LS ES MS BN59 00168A PBA SUB PHONE GH15MS GH15_PHONE GH15MS CIS BN59 00169A SPEAKER SYSTEM GH15MS RIGHT GH15MS CIS BN59 00169B SPEAKER SYSTEM GH15MS LEFT GH15MS Loc No Code No Description Specification Remarks 6 2 Others 6 3 1 Different Part List GH15ES C190 ...

Page 25: ...4270 CONNECTOR HEADER BOX 2P 1R 2MM ANGLE SN CN402 3711 004386 CONNECTOR HEADER BOX 3P 1R 2mm ANGLE SN FT401 3301 001145 CORE FERRITE BEAD AB 4 5x1 6x1 6mm FT402 3301 001145 CORE FERRITE BEAD AB 4 5x1 6x1 6mm IC109 1204 000292 IC VIDEO SYSTEM IC VIDEO LM1881M SOP 8P 150MIL IC401 1204 001833 IC VOLUME CONTROL TDA7496L DIP 20P PLASTIC 26V Q401 0501 002080 TR SMALL SIGNAL 2SC2412K NPN 200mW SOT 23 TP...

Page 26: ...GH15LS GH15ES GH15MS 7 1 7 Block Diagram ...

Page 27: ...7 Block Diagrams 7 2 GH15LS GH15ES GH15MS Memo ...

Page 28: ...GH15LS GH15ES GH15MS 8 1 8 Wiring Diagram ...

Page 29: ...Memo 8 Wiring Diagram 8 2 GH15LS GH15ES GH15MS ...

Page 30: ...PANEL TP53 FT906 BLM41P600S 1 A 2 B BLM41P600S FT113 A 1 B2 U22 1 5 6 D2 D3 7 8 D4 G1 4 1 S1 S2 2 3 S3 5V_FE 5V_FE SI4435DY Q192 D1 1 16W 10K R190 50V MO C190 100pF 50V MO VCC 5 Y 4 C194 10nF 8 IC106 NC7SZ04P5X A 2 GND 3 NC 1 SUPLECODE 1 2 3 4 5 6 7 MO 50V 0 01nF C173 RC205 C172 15pF 50V MO RA132 1 2 3 4 5 6 7 8 X100 Q0 Q1 TP80 1 B C E 3 3V_S AS 20 000 20 FUND SMD 2SC2412K Q Q106 100nF 16V 100nF 1...

Page 31: ...9 2 GH15LS GH15ES GH15MS 1 5 6 7 2 3 4 9 Schematic Diagrams ...

Page 32: ...B 2 16V 100uF C409 BLM41P600S FT402 1 R413 1 16W 100K 33uF C420 MO 50V 100pF C403 U41 1 2 U28 1 16V C413 100nF slcon2p CN401 100K 1 16W R412 16V 470uF C412 C410 470uF 16V 1 TP911 1 U32 1 U33 U29 1 1 16W 1K R405 U18 1 U27 1 1 100 R401 U31 1 U25 12V_IN 12V_AUDIO C406 10uF 16V 1 U23 1 TP914 1 U36 1 U37 16V C414 100nF TP913 1 FT401 BLM41P600S 1 A 2 B R403 100 SI4435DY 5 D1 6 D2 D3 7 8 D4 4 G1 S1 1 2 S...

Page 33: ...9 Schematic Diagrams 9 4 GH15LS GH15ES GH15MS Memo ...

Page 34: ...o Ltd 416 Maetan 3Dong Paldal Gu Suwon City Kyungki Do Korea Printed in Korea P N BN68 00225A 00 http www samsungmonitor com SyncMaster Worldwide http www samsung monitor com SyncMaster USA http www sec co kr monitor Korea ...

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