Samsung SyncMaster 940Fn Service Manual Download Page 35 | Manualshive

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4 Troubleshooting

4-1

4 Troubleshooting

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•
•

“

”

4-1 No Power

When pin4 of CN600 is 0V

does proper DC 5V appear at
Pin 6.7 of CN600 separately?

Change IP Board.

Yes

No

When pin1 of IC600 is 5V

does proper DC 3.3V appear

at Pin 3 of IC600

Check IC600 related circuit

Yes

No

Yes

Does proper DC 3.3V appear

at pin of IC200

Check IC200 and related circuit

No

When pin3 of IC601,IC602

is 5V does proper DC 1.8V

appear at Pin 3 of IC601,

IC602 ?

Check IC601,IC602 related circuit

No

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Summary of Contents for SyncMaster 940Fn

Page 1: ...shion Feature LCD Monitor Chassis LHA19PS Model 940Fn Lustrous Colorful Appearance Design Integrated UI applied Built in Scaler Sync Separator Connectivity Analog 15p Dsub Dual 24p DVI D Power Consumption 38W DPMS under 1 W 230Vac ...

Page 2: ... City Gyeonggi Do Korea 443 742 Printed in Korea P N BN82 00136C 00 URL http itself sec samsung co kr This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law ...

Page 3: ...re configured values may not be comfortable to your eyes depending on your taste If this is the case adjust the brightness and con trast by using the OSD menu 2 Text Normal brightness For documentations or works involving heavy text 3 Internet Medium brightness For working with a mixture of images such as text and graphics 4 Game For watching motion pictures such as a game 5 Sport For watching mot...

Page 4: ...indicator This light glows green during normal operation and blinks green once as the monitor saves your adjustments 10 2 Rear The configuration at the back of the monitor may vary from product to product 1 Power port Connect the power cord for your monitor to the power port on the back of the monitor 2 DVI IN port Connect the DVI Cable to the DVI port on the back of your monitor 3 RGB IN port Con...

Page 5: ...ect the DVI Cable to the DVI port on the back of your monitor 2 3 Connected to a Macintosh Connect the monitor to the Macintosh computer using the DVI A to D sub connection cable 2 4 In the case of an old model Macintosh you need to connect the monitor using a special Mac adapter 3 Turn on your computer and monitor If your monitor displays an image installation is complete 10 Operating Instruction...

Page 6: ...or B Mounting interface pad 1 Turn off your monitor and unplug its power cord 2 Lay the LCD monitor face down on a flat surface with a cushion beneath it to protect the screen 3 Align the mounting interface pad with the holes in the rear cover mounting Pad and secure it with four screws that came with the arm type base wall mount hanger or other base ...

Page 7: ...res for the TFT LCD monitors WARNING This monitor contains electrostatically sensitive devices Use caution when handling these components 11 1 Disassembly Simple Stand Cautions 1 Disconnect the monitor from the power source before disassembly 1 Place monitor face down on cushioned table Remove 3 screws from the stand 2 Remove stand and front cover ...

Page 8: ...11 Disassembly and Reassembly 11 2 3 Lift up the back cover and Use the jig to remove the shield lamp 4 Disconnect cables 5 Lift up the shield and disconnect LVDS cable ...

Page 9: ...11 Disassembly and Reassembly 11 3 11 2 Disassembly HAS Stand 6 Lift up the LCD panel 1 Place monitor face down on cushioned table Remove 2 screws from the stand and remove front cover ...

Page 10: ...11 Disassembly and Reassembly 11 4 2 Lift up the back cover and Use the jig to remove the shield lamp 3 Disconnect cables 4 Lift up the shield and disconnect LVDS cable ...

Page 11: ...11 Disassembly and Reassembly 11 5 5 Lift up the LCD panel 11 3 Reassembly Reassembly procedures are in the reverse order of disassembly procedures ...

Page 12: ...11 Disassembly and Reassembly 11 6 Memo ...

Page 13: ...12 PCB Layout 12 1 12 PCB Diagram ...

Page 14: ...12 PCB Layout 12 2 Memo ...

Page 15: ... to adjust monitor to optimum condition by pushing one key OSD On Screen Display On screen display customer can control the screen easily with this Image Lock This means Fineness adjustment in LCD Monitor the features are Fine and Coarse FINE Fine adjustment is used to adjust visibility by con trol phase difference COARSE This is a adjustment by tuning with Video colck and PLL clock L V D S Low Vo...

Page 16: ...owing the horizontal lines of the screen from the top to the bottom in order is called the Non Interlace method while showing odd lines and then even lines in turn is called the Interlace method The Non Interlace method is used for the majority of monitors to ensure a clear image The Interlace method is the same as that used in TVs Plug Play This is a function that provides the best quality screen...

Page 17: ...ower Input 5V Self Raster GND Bi Dr Data SDA H V Sync Not Used DDC Clock SCL Red Green H V Sync Blue GND DDC Return GND GND R GND G GND B DDC Power Input 5V Self Raster GND Bi Dr Data SDA Not Used Not Used DDC Clock SCL Sync on green No Connection 5V_M Self Raster 5V_M Rx0 Rx0 NC No Connection No Connection NC RxC RxC 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 Rx2 Rx2 GND No Co...

Page 18: ...Remark IBM 640 75 Hz 640x480 800 60 Hz 800x600 800 75 Hz 800x600 1024 60 Hz 1024x768 1024 75 Hz 1024x768 VGA2 70 Hz 720 x 400 VGA3 60 Hz 640 x 480 Table 2 1 Timing Chart 31 469 31 778 3 813 1 589 26 058 0 318 59 940 16 683 0 064 0 794 15 761 0 064 26 175 Negative Negative Separate 37 500 26 667 2 032 3 810 20 317 0 508 75 000 13 333 0 080 0 427 12 800 0 027 31 500 Negative Negative Separate 37 879...

Page 19: ...2 x 864 67 500 75 000 108 00 VESA 1280 x 960 60 000 60 000 108 00 VESA 1280 x 1024 63 981 60 020 108 00 VESA 1280 x 1024 79 976 75 025 135 00 If the signal transferred from the computer is the same as the following Preset Timing Modes the screen will be adjusted automatically However if the signal differs the screen may go blank while the power LED is on Refer to the video card manual and adjust t...

Page 20: ... LTM170E5 L04 BN07 00072A EK E5 L04 6 bits FRC for IBM SEC LTA220W1 L01 BN07 00074A EL Panel for 22 TV SEC LTM170E6 L02 BN07 00075A EM AMLCD Narrow slim design 17 PVA mode SEC LTM170W1 L01 BN07 00082A EN LTM170W1 L01 ZPD panel SEC LTM170EH L01 BN07 00080A EP LTM170EH L01 ZPD panel SEC LTM170E5 L01 BN07 00081A EQ LTM170E5 L01 ZPD panel SEC LTM170EH L05 BN07 00083A ER LTM170EH L05 ZPD panel SEC LTM1...

Page 21: ...Z AMLCD 32 NEW panel SEC LTM213U4 L01 BN07 00124B SPZ 21 3 Narrow PANEL ZPD Panel derivation SEC LTM170EU L11 BN07 00189A STH AMLCD EU L11 Pb free panel code derivation SEC LTM170EU L11 BN07 00189B STZ AMLCD EU L11 Pb free panel ZPD code derivation SEC LTM240W1 L04 BN07 00188A SPH 24 A DCC new panel development SEC LTM240W1 L04 BN07 00188B SPZ 24 A DCC panel ZPD code derivation SEC LTM190EX L01 BN...

Page 22: ...6 BN07 00042A RB TORISAN TM181SX 76N01 BN07 00048A RC TORISAN TM150XG 26L06 BN07 00059A RD 15 XGA TN MODE ZPD TORISAN TM290WX 71N31 BN07 00063A RE RS24NS TORISAN 29 NEW PANEL TORISAN TM396WX 71N31 BN07 00064A RF RS24NS TORISAN 40 NEW PANEL TORISAN TM150XG 26L09 BN07 00073A RG Panel for 15 TV TORISAN TM150XG 26L10 BN07 00089A RH L10 change except D IC ZPD TORISAN TM150XG 26L10 BN07 00090A RJ L10 NO...

Page 23: ...WG type new Panel 8msec ZPD code derivation ACER T260XW02 BN07 00233A AMZ AUO 26 Panel new Cosmetic spec down grade ACER T315XW01 BN07 00234A AMZ AUO 32 Grade new Cosmetic spec down grade ACER M190EN03 BN07 00224A AMZ AU Monitor 19 MVA new code derivation ACER T315XW01 BN07 00237A AMZ LCD TV VE project new ACER T315XW01 BN07 00238A AMZ LCD TV VE project new ACER M201UN02 V3 BN07 00168A AMZ CHIMEI ...

Page 24: ...14 Reference Infomation 14 10 Memo ...

Page 25: ...24 Pixels Input Video Signal Analog 0 7 Vp p positive at 75Ω 10 internally terminated Input Sync Signal Type Seperate H V sync Composite H V Sync on Green option automatic synchronization without external switch of sync type Level TTL level Maximum Pixel Clock rate 140 MHz Active Display Horizontal Vertical 396 mm 324 mm AC power voltage Frequency AC 100 to 240 VAC 10 60 50Hz 3Hz Power Consumption...

Page 26: ...ty Card Not available in all locations User s Guide Monitor Driver Natural Color software MagicTune â software MagicRotation software DVI A to D SUB Cable 3EA Power Cord 3EA DVI Cable 3EA BH68 00376L BH68 70438A BN59 00486G BN39 00310B 3903 000042 BN39 00246F 2 3 Option Specification ...

Page 27: ... consumption is 0 6W 5V 60mA 0 9W so that the total power consumption is less than 1W 2 When the AD board is operating normally 2 1 The maximum power consumption of the panel lamps is described below It may vary depending on the panel manufacturer 17 4 7 5mA 650mVrms 4 4 9 19 6W 19 4 7 5mA 720mVrms 4 5 4 21 6W 2 2 The power consumption of the Panel Control board is as follows 5V 720mA 3 6W 2 3 The...

Page 28: ...or down scaling that are transferred to the panel in the LDVS formats 5 Crystal Oscillator Use one 24MHz oscillator externally to supply power to both MCU and Scaler at the same time 6 MCU EEPROM I2C is a two way serial bus of two lines that supports communications across the integrated circuits as well as between MCU Scaler and EEPROM In particular MCU and Scaler SE56AWL use the DDR direct bus fo...

Page 29: ...n I nput put 1 13Vdc dc I P BOARD BOARD BLOCK BLOCK I N V N VERTER ERTER 5 5Vd Vdc ADI M I M 3 3 3Vdc BDI M I M 4 5V 5Vdc I N VERT VERTER ER PART PART CO CON TRO ROL PART POWER DC INPUT ON OFF DIM INPUT FULL BRIDGE CIRCUIT INVERTER CONTROL IC DRIVER IC FEED BACK CIRCUIT PROTECTION CIRCUIT Lamp Lamp Lamp Lamp ...

Page 30: ...ROTECTION MODE 1 OVP Over Voltage Protection If the Voltage of the series capacitors C10 C15 is over the 2 0V the Inverter latched off See the Picture1 2 OLP Over Load Protection If the inverter output harness is opened No output current the base of the Q1 turns on and chage the C9 ovter 2V and then the Inverter latched off See the Picture2 ...

Page 31: ...E Yes No 3 pin of FDM0565R Vcc system in normal HIGH Check the Vcc system Yes No 1 pin of FDM0565R Check the drain system Normal Switching Check the output current Check the main switching Check others Harness Inlet Power On No Check the feedback system No Check the protection system No Yes Yes ...

Page 32: ...ins of FDM0565R Check Protection Normal 0 6V 0 8V Check the IC drive Check MOSFET Yes No 1 and 2 pins of FDM0565R Check Protection Normal 0 6V 0 8V Check the output current Check the OVP and OLR circuits Check others Power On No Check the feedback system No Check any dimming circuit No Yes Yes ...

Page 33: ...13 Circuit Descriptions 13 7 13 3 IP BOARD Power Schematic Diagrams ...

Page 34: ...13 Circuit Descriptions 13 8 13 4 IP BOARD Inverter Schematic Diagrams ...

Page 35: ...ely Change IP Board Yes No When pin1 of IC600 is 5V does proper DC 3 3V appear at Pin 3 of IC600 Check IC600 related circuit Yes No Yes Does proper DC 3 3V appear at pin of IC200 Check IC200 and related circuit No When pin3 of IC601 IC602 is 5V does proper DC 1 8V appear at Pin 3 of IC601 IC602 Check IC601 IC602 related circuit No ...

Page 36: ...ar at R147 R830 R142 R145 check input part No Yes Does sync signal figure 2 3 appear at Pin 1 pin100 of IC400 check IC400 and related circuit No Yes Does sync signal figure 2 3 appear at pin43 pin44 of IC200 check IC200 and related circuit No Yes Does the output signal appear at Pin 17 20 22 27 of CN400 check IC 400 and related circuit No Yes Does DC 5V appear at pin 28 29 30 of CN400 check the pa...

Page 37: ...4 Troubleshooting 4 3 1 WAVEFORMS 2 3 ...

Page 38: ...e R G B input at R126 R131 like as figure 4 5 6 check input part Yes No Is there waveform figure 7 at R132 R133 R140 R141 check input part No Yes Does the output signal appear at Pin 17 20 22 27 of CN400 check IC 400 and related circuit No Yes Does DC 5V appear at pin 28 29 30 of CN400 check the panel_En signal and BL_En signal and related circuit No Yes Replace LCD Panel 6 7 4 5 ...

Page 39: ...4 Troubleshooting 4 5 1 4 5 6 7 WAVEFORMS ...

Page 40: ...Memo 4 Troubleshooting 4 6 ...

Page 41: ...elow jig Figure 1 and enter the data 3 4 OSD Adjustment When Replacing Panel 1 Adjust brightness and contrast to 0 Then press the Enter Source key for 5 second Service function OSD will appear on screen 2 Press the key to place the cursor on the panel Press the menu key for 5 seconds 3 5 OSD Adjustment When Replacing Lamp Only 1 Adjust brightness and contrast to 0 Then press the exit key for 5 sec...

Page 42: ...service function OSD you will have to power off Figure 2 The example of service function OSD Figure 3 Panel Information Softward Version Checksum The service function OSD is based on a grid of 29 columns x 12 rows The service function OSD consists of panel information software version and MICOM checksum 3 6 2 How to Control Service Function OSD 1 With the panel selected on OSD whenever you press t...

Page 43: ... panel Ch No increases one step and the panel time information is reset to zero Simultaneously other information is reset to zero Upper Lower lamp Panel cycle Figure 5 6 3 6 4 How to Control Service Function OSD In the case of Upper Lamp or Lower Lamp change After changeing the Upper Lamp or Lower Lamp 1 Select the Upper Lamp or Lower Lamp 2 Press the Menu key within an 5 seconds Then Ch No and ti...

Page 44: ...ts 3 4 3 7 How to execute DDC 1 3 2 4 5 1 Open file 2 Select Port 1 3 Select DDC file 4 Click Next Button 5 Type in the monitor serial number and press Enter Repeat this step 2 to 5 times in digital inputs after the analog input ...

Page 45: ...NECTOR DSUB 24P 5C 3R FEMALE ANGLE AU 1 S A 3 CN400 3711 005884 HEADER BOARD TO BOARD BOX 30P 2R 2mm ANG 1 S A 3 M0131 BN63 00533A GASKET BESTBUY17 CONDUCTIVE FABRIC 7 5M 1 S N A 3 M0131 BN63 01243A GASKET KD17AS CONDUCTIVE FABRIC 3mm 13mm 1 S N A 3 T0174 BN97 00644K ASSY SMD LS19HAP 1 S N A 4 D100 0401 001056 DIODE SWITCHING MMBD4148SE 100V 200MA SO 1 S A 4 D101 0401 001056 DIODE SWITCHING MMBD41...

Page 46: ...22 1 S A 4 T0087 1203 003696 IC POSI FIXED REG NCP1117DT18T5G DPAK 3 1 S A 4 T0087 1203 003696 IC POSI FIXED REG NCP1117DT18T5G DPAK 3 1 S A 4 R112 2007 000070 R CHIP 0ohm 5 1 10W TP 1608 1 S A 4 R113 2007 000070 R CHIP 0ohm 5 1 10W TP 1608 1 S A 4 R114 2007 000070 R CHIP 0ohm 5 1 10W TP 1608 1 S A 4 R115 2007 000070 R CHIP 0ohm 5 1 10W TP 1608 1 S A 4 R116 2007 000070 R CHIP 0ohm 5 1 10W TP 1608 ...

Page 47: ...5 1 10W TP 1608 1 S A 4 R438 2007 000072 R CHIP 47ohm 5 1 10W TP 1608 1 S A 4 R439 2007 000072 R CHIP 47ohm 5 1 10W TP 1608 1 S A 4 R440 2007 000072 R CHIP 47ohm 5 1 10W TP 1608 1 S A 4 R142 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R143 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R144 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R145 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 ...

Page 48: ...Kohm 5 1 10W TP 1608 1 S A 4 R208 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R209 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R211 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R212 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R213 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R214 2007 000084 R CHIP 4 7Kohm 5 1 10W TP 1608 1 S A 4 R215 2007 000084 R CHIP 4 7Kohm 5 1...

Page 49: ...hm 1 1 10W TP 1608 1 S A 4 R122 2007 001164 R CHIP 75ohm 1 1 10W TP 1608 1 S A 4 R123 2007 001164 R CHIP 75ohm 1 1 10W TP 1608 1 S A 4 R443 2007 002899 R CHIP 10ohm 1 1 10W TP 1608 1 S A 4 R444 2007 002899 R CHIP 10ohm 1 1 10W TP 1608 1 S A 4 R445 2007 002899 R CHIP 10ohm 1 1 10W TP 1608 1 S A 4 R446 2007 002899 R CHIP 10ohm 1 1 10W TP 1608 1 S A 4 C425 2203 000041 C CER CHIP 0 01nF 0 25pF 50V C0G...

Page 50: ... 100nF 10 16V X7R 1608 1 S A 4 C415 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C417 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C418 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C419 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C420 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C421 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C422 2203 005005 C CE...

Page 51: ...2 63Sn 37Pb 0 01 S N A 2 M0006 BN96 02241C ASSY SHIELD P COVER HA19Fn SECC T0 8 2DV 1 S N A 3 BN63 01774A SHIELD INSULATOR BI17 19BS PET T0 35 1 S N A 3 M0107 BN63 01974C SHIELD COVER HA19Fn SECC T0 8 398 222 2D 1 S N A 2 M0174 BN44 00124C IP BOARD IP 35135B H BI17VS 3 0 4 0mA 1 S A 2 M2893 BN39 00664D LEAD CONNECTOR LS19HAP 940FN UL1571 30 1 S A 2 M0081 6003 000334 SCREW TAPTITE RH 2S M3 L6 ZPC Y...

Page 52: ...ty SA SNA 2 T0376 6902 000379 BAG AIR LDPE T0 2 W1000 L1800 TRP 0 002 S N A 2 T0524 6902 000520 BAG PE HDPE NITRON DOUBLE T0 015 T0 5 D 1 S N A 2 P M 6902 000604 BAG WRAPPING LDPE T0 02 W500 L10000 TRP 1 51 S N A 2 M0081 6902 000609 BAG ROLL LDPE T0 05 W2400 L1000 TRP 0 1 S N A ...

Page 53: ...List 5 1 5 Exploded View and Parts List You can search for updated part codes through ITSELF web site URL http itself sec samsung co kr 5 1 Exploded View T0003 M0112 T0022 T0145 M0215 CIS M0006 T0077 M0174 M0107 T0003 M0006 ...

Page 54: ...P VD 05 05 1 SA M0215 BN07 00224A LCD PANEL M190EN03 Matisse 8BIT 396 324 1 SA M0006 BN63 02254A COVER REAR HA19Fn HIPS 2 0 HB BK24 2 DVI 1 SA M0107 BN63 01974C SHIELD COVER HA19Fn SECC T0 8 398 222 2D 1 SNA T0077 BN41 00633A PCB MAIN HAYDN FR4 2L MP1 0 0 6T 105 8 1 1 SNA M0174 BN44 00124C IP BOARD IP 35135B H BI17VS 3 0 4 0mA 1 SA CIS BN63 01781A SHIELD LAMP BI19BS SPTE T0 3 1 SNA T0003 BN96 0223...

Page 55: ...7 Block Diagrams 7 1 7 Block Diagram 7 1 Power Tree ...

Page 56: ...7 Block Diagrams 7 2 7 2 Main Board Part ...

Page 57: ...7 3 IP Board Part SMPS Part 7 Block Diagrams 7 3 ...

Page 58: ...7 4 IP Board Part Inverter Part 7 Block Diagrams 7 4 ...

Page 59: ...8 Wiring Diagram 8 1 8 Wiring Diagram ...

Page 60: ...8 Wiring Diagram 8 2 Memo ...

Page 61: ...pliances 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 screwhe...

Page 62: ...ord from the AC source and turn the power switch 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 inst...

Page 63: ...oisture Otherwise it may cause a fire or electric shock 5 Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product Also check the antenna cable or the external connectors if they are fully unplugged Damage to the cord may cause fire or electric shock 6 Keep the antenna far away from any high voltage cables and install it firmly Contact with the hig...

Page 64: ...Memo 1 Precautions 1 4 ...

Page 65: ...9 Schematic Diagrams 9 1 9 Schematic Diagrams This Document can not be used without Samsung s authorization 9 1 Schematic Diagrams ...

Page 66: ...9 Schematic Diagrams 9 2 1 2 3 4 5 6 7 ...

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