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ViewSonic N1750w SERIES Service Manual

Lcd tv monitor
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LCD TV MONITOR
N1750w SERIES
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND
DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
MANUFACTURE DATA: Jan-30-2005
1

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Summary of Contents for ViewSonic N1750w SERIES

  • Page 1 LCD TV MONITOR N1750w SERIES THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
  • Page 2 VESA is a registered trademark of the Video Electronics Standards Association. DPMS and DDC are trademarks of VESA. Disclaimer: ViewSonic Corporation shall not be liable for technical, editorial errors, or omissions contained herein; nor for incidental or consequential damages resulting from furnishing this material, or the performance or use of this product.
  • Page 3 See Figure below. 22. Objects and Liquid Entry – Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. ViewSonic Corporation N1750w...

  • Page 4: Table Of Contents

    7.3.1 Description ………………………………………………………………………… 7.3.2 Block diagram ……………………………………………………………………… 7.3.3 Pin functions …………………………………………….………………………… UPD64083………………………………………..…………………………………….. 7.4.1 Description ………………………………………………………………………… 7.4.2 Block diagram ……………………………………………………………………… TDA7266D..…………..………………………………………………………………... 7.5.1 Description ………………………………………………………………………… 7.5.2 Block diagram ……………………………………………………………………… Block diagram ............…………………………………….……... 9. Schematic diagram …...............………………….……….. Main board………………………………………………………………….…………. Power board………………………………………………………………….………… ViewSonic Corporation N1750w...

  • Page 5: Revision List

    Revision list Revision Date Modification Description Jan-30-05 Initial Release ViewSonic Corporation N1750w...

  • Page 6: Specifications

    Kg (w/o Accessories) 6.8 Kg OSD language English / French / Spanish Table Stand Included Wall Mount VESA 100 x 100 mm Remote Controller, Batteries (x2), AC Power Cord, D-sub Signal Cable, Audio line, User’s Accessories Manual, QSG ViewSonic Corporation N1750w...

  • Page 7: Lcd Tv Description

    15 - Pin Color Display Signal Cable PIN NO. DESCRIPTION PIN NO. DESCRIPTION RED Video GREEN Video Sync Ground BLUE Video RXD (for ISP) TXD (for ISP) Serial Data for DDC Ground HORIZ. SYNC Ground-R VERT. SYNC Ground-G Serial Clock for DDC Ground-B ViewSonic Corporation N1750w...

  • Page 8: Factory Preset Display Modes

    1250mV Max without damage to the product, 0-700 mV Full Range Input Signal Rating 2.5-5.25 V Sync Level: Horizontal: 31.5-61K Hz, Vertical: 60-75 Hz Frequency Range 16 M Pixel Color DDC2B Compliant DDC Compliance See Appendix B EDID Data Table ViewSonic Corporation N1750w...

  • Page 9: Audio

    >= 70% @ full load, nominal line 13 Leakage Current <3.5mA @ 110VAC Power Saving When system is “OFF”, some minimal (<5W) power shall be consumed. 15 Recovery Time < 3 sec. 16 Power Factor Correction Compliant with EN61000-3-2 ViewSonic Corporation N1750w...

  • Page 10: Adjustment

    Setting V-Chip function enable or disable TV Guidelines TV Guidelines Setting Movie Guidelines Movie Guidelines Setting Change Pin Change Pin for V-Chip control Sleep Timer Setting time to auto turn TV off Set Up Setting TV basic function ViewSonic Corporation N1750w...
  • Page 11 Setting color Temp. more blue. Color Color Temp. Relative setting V-Chip V-Chip relative setting f Status Setting V-Chip function enable or disable TV Guidelines TV Guidelines Setting Movie Guidelines Movie Guidelines Setting Change Pin Change Pin for V-Chip control ViewSonic Corporation N1750w...

  • Page 12: Assembly And Disassembly Procedure

    4.1 Disassembly 1. Remove the cover rear as arrow direction 2. Unscrew and remove eleven screws marked red. For a screw under 3. Remove the back rear. the base ViewSonic Corporation N1750w...
  • Page 13 7. Remove the connector wire marked blue in power board. 8. Unscrew and remove four screws marked red in main board. 9. Remove the connector wire marked blue in main board. 10. Remove the power board and main board synchronously ViewSonic Corporation N1750w...
  • Page 14 LCD Panel ViewSonic Corporation N1750w...

  • Page 15: Explode View

    5. Exploded view ViewSonic Corporation N1750w...

  • Page 16: Pcb Layout

    6. PCB Layout 6.1 Main board ViewSonic Corporation N1750w...

  • Page 17: Power Board

    6.2 Power board ViewSonic Corporation N1750w...

  • Page 18: Main Board Ic Descriptions

    Scaling up/down Skin/Gain/ controller interface engine Offset Port C Graphic mode De-interlaced Gamma timing table/Dithering generator Display timing output controller Display timing OSD MUX generator Sync signals Sync Timing Auto Processor Generator Calibration OSD engine Flash ROM ViewSonic Corporation N1750w...

  • Page 19: List Of Pins And Package

    RTC crystal pad ground Key-Scan ADC Interface ADCVSS33 Key-scan ADC analog ground ADC0 Channel 0 input ADC1 Channel 1 input ADCVDD33 Key-scan ADC analog power 3.3V USB Interface If built-in USB transceiver is disabled, the SPV302A must ViewSonic Corporation N1750w...
  • Page 20 CPU port2, high byte address, bit2 CPU port2, high byte address, bit3 CPU port2, high byte address, bit4 CPU port2, high byte address, bit5 CPU port2, high byte address, bit6 CPU port2, high byte address, bit7 Default function Alternative function ViewSonic Corporation N1750w...
  • Page 21 VOUT]37:30] are routed to SVM DAC. TVOUT TCON Single Dual Single Single Dual pixel pixel pixel pixel 8bit pixel 6bit 8bit 10bit 6bit VOUT0 VOUT1 VOUT2 VOUT3 VOUT4 VOUT5 VOUT6 VOUT7 VOUT8 VOUT9 VOUT10 VOUT11 VOUT12 VOUT13 VOUT14 VOUT15 VOUT16 VOUT17 ViewSonic Corporation N1750w...
  • Page 22 Connect to power via a 0.1UF capacitor AC13 VMCBL Connect to power via a 0.1UF capacitor AF12 VMREF DAC scale adjustment AF11 VMREF DAC voltage reference AD12 AVDD33 SVM DAC Analog power 3.3V General Purpose I/O power GPIO GPIO GPIO GPIO ViewSonic Corporation N1750w...
  • Page 23 D,R,8 MD22 SDRAM data bus, bit22 D,R,8 MD23 SDRAM data bus, bit23 D,R,8 MD24 SDRAM data bus, bit24 D,R,8 MD25 SDRAM data bus, bit25 D,R,8 MD26 SDRAM data bus, bit26 D,R,8 MD27 SDRAM data bus, bit27 D,R,8 ViewSonic Corporation N1750w...
  • Page 24 Single Dual 422 format 411 format 422 format format pixel pixel DATAA0 DATAA1 DATAA2 DATAA3 DATAA4 V6/4/2/0 DATAA5 V7/5/3/1 DATAA6 U6/4/2/0 DATAA7 U7/5/3/1 DATAA8 YUV0 DATAA9 YUV1 DATAA10 YUV2 DATAA11 YUV3 DATAA12 YUV4 DATAA13 YUV5 DATAA14 YUV6 ViewSonic Corporation N1750w...
  • Page 25 AC8,AC11,AC15,AC16,AC17,D9, D10,D11,D17,D18,D19,K4,K23,L4,L23, DVDD25 2.5V T23,U4,U23,V4,V23 No Connection Pins B22,B21,C16 N.C. Memo: U: internal pull-up R: Limited slew rate output D: internal pull-down 8: 8mA output current S: Schmitt trigger input 16: 16mA output current T: 3-state output ViewSonic Corporation N1750w...

  • Page 26: Io-Trap

    00: delay 64 xtal clocks Trap[9:8] Lvdelay 01: delay 128 xtal clocks 10: delay 256 xtal clocks 11: delay 512 xtal clocks 0: set video output interface to VOUT port Trap[10] 1: set parallel MPU interface to VOUT port ViewSonic Corporation N1750w...

  • Page 27: Ad9883

    The AD9883A is a complete 8-bit, 140 MSPS monolithic analog interface optimized for capturing RGB graphics signals from personal computers and workstations. Its 140 MSPS encode rate capability and full power analog bandwidth of 300 MHz supports resolutions up to SXGA (1280 x 1024 at 75Hz). 7.2.2 Block diagram ViewSonic Corporation N1750w...

  • Page 28: Vpc3230D

    I2C Bus Data RESQ Reset Input, Active Low TEST GNDD Test Pin, connect to GNDD VGAV GNDD VGAV Input YCOEQ GNDD Y/C Output Enable Input, Active Low FFIE FIFO Input Enable FFWE FIFO Write Enable FFRSTW FIFO Reset Write/Read ViewSonic Corporation N1750w...
  • Page 29 Analog Video Output Chroma / Analog Video 5 Input VIN1 VRT* Video 1 Analog Input VIN2 Video 2 Analog Input VIN3 Video 3 Analog Input VIN4 Video 4 Analog Input VSUPAI SUPPLYA Supply Voltage, Analog Component Inputs Front- ViewSonic Corporation N1750w...

  • Page 30: Upd64083

    This product has the On-chip 4-Mbit memory for flame delay, 2ch of high precision internal 10-bit A/D converter, and single- chip system of 3D Y/C separation. This LSI includes the Wide Clear Vision ID signal (Japanese local format) decoder and ID-1 signal decoder. 7.4.2 Block diagram ViewSonic Corporation N1750w...

  • Page 31: Tda7266D

    7.5 TDA7226D 7.5.1 Description The TDA7266D is a dual bridge amplifier specially designed for LCD monitor, PC Motherboard, TV and Portable Ratio applications 7.5.2 Block diagram ViewSonic Corporation N1750w...

  • Page 32: Block Diagram

    TV_audio Speaker (2Wx 2) PT2308 TDA7266D EAR AMP Audio AMP D-SUB_audio MSP 3425G AUDIO Decoder Audio 1 Audio Line Out HCT 4052 Audio 2 (RCA) Selector Headphone Y/Pb/Pr NOTE: .AV2 and S-VIDCO USE the same Audio Input ViewSonic Corporation N1750w...

  • Page 33: Schematic Diagram

    120 OHM C135 3230_PB INTERLACE_PB 4 AGND 10uF/16V O_PRO_PR R120 R121 I_DVD_PR J102A 3230_PR INTERLACE_PR 4 J105A JACK JACK Q103 Q102 R122 MUTE COMP_SEL 6,10 AV_2 U104 AV1_R PI5V330 AV2_L AV1_L AGND AV2_R AV_1 AGND AGND AGND ViewSonic Corporation N1750w...
  • Page 34 C128 47uF/16V Bin2 COMP_Pb VSEL_HS Hin2 HOUT Vin2 VOUT VSEL_VS LOW:INPUT1 12VS HIGH:INPUT2 R124 R125 U105 5V_MUX 　 1/16W + C129 C100 0.1uF 　 47uF/16V VIDEO_SEL C163 C168 RN102 C164 0.1uF 10uF/16V AGND 10uF/16V R126 RN103 AGND ViewSonic Corporation N1750w...
  • Page 35 AGND 　 U101 5V_A C103 C104 0.1uF 100uF/16V L107 L106 600 OHM 600 OHM C106 L105 C105 C109 C108 C107 0.1uF/16V 100uF/16V Q101 PMBS3904 R105 R106 AGND TUNER_OUT 　 1/16W R107 C110 　 1/16W 47pF AGND AGND ViewSonic Corporation N1750w...
  • Page 36 0.22uF AGND L207 3.3VS L208 600 OHM VDDA VDDI 600 OHM C230 C231 C232 C233 C234 C235 C236 C237 C238 C239 C240 10uF/16V R200 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 100uF/16V 　 1/16W AGND ViewSonic Corporation N1750w...
  • Page 37 R351 22 　 1/16W R352 22 　 1/16W 3.3VM 　 1/16W DQML1 MDQML1 RASNN MRASNN 3,4,6,9,11,14,15 R355 22 　 1/16W R356 22 　 1/16W 3,4,6,9,11,14,15 DQMH1 MDQMH1 WENN MWENN R354 　 1/16W CKER C378 MCSNN 0.1uF M24C16-MN6T ViewSonic Corporation N1750w...
  • Page 38 Q302 CH_SEL2 I/O2 I/O6 R318 　 1/16W R319 　 1/16W SRS_CTL CH_SEL3 I/O3 I/O5 R320 　 1/16W I/O4 VIDEO_SEL VIDEO_SEL for ADC input selection SEL1 SEL2 SEL3 audio video (source :HD & VGA) SCART SCART TUNER SVIDEO ViewSonic Corporation N1750w...
  • Page 39 DVSS25_TB2 DVSS33_7 DVSS25_TB3 DVSS25_TB4 DVSS25_TB5 DVSS33_TB1 DVSS25_TB6 DVSS33_TB2 DVSS25_TB7 DVSS33_TB3 DVSS25_TB8 DVSS33_TB4 DVSS25_TB9 DVSS33_TB5 DVSS25_TB10 DVSS33_TB6 DVSS25_TB11 DVSS33_TB7 DVSS25_TB12 DVSS33_TB8 DVSS25_TB13 DVSS33_TB9 DVSS25_TB14 DVSS33_TB10 DVSS25_TB15 DVSS33_TB11 DVSS25_TB16 DVSS33_TB12 DVSS25_TB17 DVSS33_TB13 DVSS25_TB18 DVSS25_TB19 DVSS25_TB20 DVSS25_TB21 DVSS25_TB22 DVSS25_TB23 DVSS25_TB24 ViewSonic Corporation N1750w...
  • Page 40 AGND U500 3.3V_AP 3.3VDD C523 VCLK VGA_SCL 0.1uF C529 VGA_SDA C524 C526 C527 C528 C525 C530 C531 C532 C533 C534 C535 10uF/16V 0.1uF 0.1uF 0.1uF 0.1uF 100uF/16V 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 24LC21A/SN AGND AGND AGND ViewSonic Corporation N1750w...
  • Page 41 　 1/16W TDA7266D MUTE PT2308S Q600 R640 PMBS3904 　 1/16W R635 R633 3.9K 　 1/16W 　 1/16W R632 3.9K 　 1/16W + C652 R637 100uF/16V 　 1/16W R638 　 1/16W R645 1/10W 　 C653 10uF/16V AGND AUDIO_GND ViewSonic Corporation N1750w...
  • Page 42 0.1uF C623 22uF/16V C624 3.3uF/16V C627 1uF/16V C626 C628 C625 10uF/16V R_OUT 10uF/16V 470pF C600 0.0015uF L603 600 OHM L_OUT C629 C630 1uF/16V R641 0.001uF C631 1/16W 　 0.001uF LINE_O_L R608 R642 　 1/16W 　 1/16W LINE_O_R ViewSonic Corporation N1750w...
  • Page 43 10uF/16V Q700 AGND AO3401 R705 C720 R700 C721 Q703 C722 C723 C724 　 1/16W 10uF/16V 10uF/16V PMBS3904 0.1uF 0.1uF 1/16W 0.1uF 　 L709 600 OHM AGND R706 1/8W 　 12V_A L700 AGND AGND 600 OHM AGND 12V_T ViewSonic Corporation N1750w...
  • Page 44 C813 TXIN19 TXOUT3 TXIN20 TXIN21 TXCOUT TXACKp TXIN22 TXCOUT C814 TXIN16 TXIN17 P_Hs TXIN24 P_Vs TXIN25 CONN P_DATAEN TXIN26 TXIN23 R803 R802 10K 1/16W 　 3.3VM R801 LVDS_EN PWRDN 1K 1/16W 　 R800 0 1/16W 　 R804 ViewSonic Corporation N1750w...
  • Page 45 R410 10K 1/16W 　 RREF R413 100 1/16W 　 3,4,5,6,9,11,15 R414 100 1/16W 　 3,4,5,6,9,11,15 R400 100 1/16W 　 VD_HS VSS_A Z86129 R415 100 1/16W 　 5V_CC L401 600 OHM U402 C411 C404 0.1uF C406 47uF/16V 0.1uF ViewSonic Corporation N1750w...
  • Page 46 AGND TEST25 C952 0.1uF/16V L915 TEST26 DVDDRAM 600 OHM AGND C953 DVDD DVDDRAM 0.1uF/16V L913 U904 600 OHM C954 0.1uF/16V C956 C961 C949 C955 C958 C959 C957 0.1uF C960 10uF/16V 10uF/16V 47uF/16V 47uF/16V 0.1uF 0.1uF 0.1uF AGND ViewSonic Corporation N1750w...

  • Page 47: Power Board

    1000pF C918 R923 PMBS3906 C902 1/10W 0.1uF/50V 1/10W 　 　 R925 R917 1/10W 　 0.001uF/250V 1/10W IC903 　 H431BA Q902 R927 C919 2.43K 1/10W 　 PMBS3904 CN902 R918 0.01uF C912 4.7K 1/10W 　 0.1uF/50V CONN CN901 SOCKET ViewSonic Corporation N1750w...
  • Page 48 RK7002 R238 C245 R237 0805 0.1uF/25V 　 150K 　 0805 R240 Q214 　 0805 RK7002 JP205 R241 C246 0.1uF/0805 　 0805 R242 Q215 0805 　 RK7002 R243 is power GND is signal GND 　 0805 C247 0.1uF/0805 ViewSonic Corporation N1750w...
  • Page 49 SR24 PMBS3906 IC101 2.7K　 R112 C113 C115 0.1uF/50V C114 R109 COMP R106 3K 1/16W 　 R111 C102 33K 1/16W 　 C103 FP5001DR FP5001 1uF/50V 15K　 0.1uF/50V R108 R110 　 0.1uF/50V 47K 1/16W 　 C104 3.6K 1/16W 0.1uF/50V ViewSonic Corporation N1750w...

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