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ViewSonic VG921m-2, Service Manual

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ViewSonic VG921m-2 Service Manual Download Page 37

 34

 

ViewSonic Corporation

 

 

Confidential - Do Not Copy 

   

VG921m-2 

6. Troubleshooting  Flow  Chart 

   

 

Q1 
 
 
 
 
 
 
 
 
                                                                           
                                                                                             
Q2 
 
         
 
 
 
 
 
 
 
 
 
 
Q3 
 
 
 
 
 
Q4 
 
 
 
 
 
 
 
 

NO POWER 

Please check if power cable is 
connected properly

 

Change P/I/A board (ps)

 

YES

 

NO   

Please reconnect power 
cable

 

NO DISPLAY

 

Please check if signal cable is 
connected properly   

 

Change Panel

 

Please reconnect signal 
cable 

 

YES

 

NO   

Display panel have horizontal 
line or vertical line 

 

Please change panel

 

The backlight is OFF

 

Please check inverter
wire if properly connected

1  

2   Please change panel or 

P/I/A board (ps)

 

Summary of Contents for VG921m-2

Page 1: ...ViewSonic VG921m 2 Model No VS11313 19 Color TFT LCD Display VG921m 2_SM Rev 1a Jan 2007 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 Service Manual...

Page 2: ...pressed or implied with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise t...

Page 3: ...tices 1 2 Specification 3 3 Front Panel Function Control Description 6 4 Circuit Description 13 5 Adjustment Procedure 14 6 Troubleshooting Flow Chart 34 7 Block Diagram 36 8 Schematic Diagrams 37 9 P...

Page 4: ...when inserting or disconnecting from input connector 3 Wipe off water drop immediately Long contact with water may cause discoloration or spots 4 When the panel surface is soiled wipe it with absorbe...

Page 5: ...y grasping the LCD panel That may cause Mura 2 Only touch the metal frame of the LCD panel or the front cover of the monitor Do not touch the surface of the polarizer 2 Surface of the LCD panel is pre...

Page 6: ...er Voltage AC 100 240V 50 60Hz Yes On Mode Max 36 W Power Consumption Off Mode Max 1 W Audio 1 5W THD 0 5 Max Yes Tilt 20 5 Yes Swivel No Pivot No Ergonomics Height Adjust No OSD Control 1 2 Mute Yes...

Page 7: ...should be off when the rest of the monitor is in power saving Panel Characteristics 1st Source Panel Model number HSD190SEN1 A04 Type Active Matrix TFT TN technology Active Size 19 376 32mm x 301 056m...

Page 8: ...5 KHz 7 640 x 480 72 Hz 37 9 KHz DMT 8 640 x 480 75 Hz 37 5 KHz DMT 9 720 x 400 70 Hz 31 5 KHz 10 800 x 600 56 Hz 35 1 KHz DMT 11 800 x 600 60 Hz 37 9 KHz DMT 12 800 x 600 72 Hz 48 1 KHz DMT 13 800 x...

Page 9: ...ic operation i e there should be no cycling Reaction Time OSD must fully appear within 0 5s after pushing Button 1 3 2 Short Cuts Function from the button s 1 Main Menu 2 Auto Image Adjust Brightness...

Page 10: ...t with the power button locked the LCD would automatically turn back On when power is restored after a power failure If the power button is not in the locked mode then power should return to it s prev...

Page 11: ...and others OSD Auto Save The OSD shall save new settings when it is turned off by the user or when it times out There shall not be a separate save 3 4 Factory Defaults Item Defaults Item Defaults Con...

Page 12: ...ically adjust H V Position Phase adjust and Clock adjust REMARK There may need to select Manual Image Adjust to optimized Performance for various VGA tolerance Contrast Brightness To adjust the Contra...

Page 13: ...10 ViewSonic Corporation Confidential Do Not Copy VG921m 2 Audio Adjust To adjust the audio volume and mute Color Adjust To select the color temperature sRGB 9300 K 7500 K 6500 K 5400 K or user color...

Page 14: ...er and Serial No of the monitor Manual Image Adjust Horizontal Size To adjust the horizontal pixel clock of the video H V Position To adjust the horizontal and vertical position of the video Fine Tune...

Page 15: ...se Resolution Notice Enable on OSD will notify the best picture quality resolution change the resolution to 1280 x 1024 OSD Position To set OSD position OSD Timeout To set the displaying time of OSD 5...

Page 16: ...HSYNC input receives a logic signal and provides the frequency reference for pixel clock generation The scaling IC is to converts the input signal ranging from VGA to SXGA GENERAL DESCRIPTION The TSUM...

Page 17: ...white screen RGB and Black c With cycled display modes 640 480 H 37 5kHz V 75Hz 800 600 H 46 9kHz V 75Hz 1024 768 H 60kHz V 75Hz 1280 1024 H 80kHz V 75Hz 1 4 Test Display Modes Pattern 1 4 1 Compatib...

Page 18: ...djustable to be within the screen frame Figure 3 4 RGB Color Performance RGB Color Intensities Contrast of each R G B color should be normal Figure 4 5 6 5 Screen Uniformity Flicker Full White Should...

Page 19: ...16 ViewSonic Corporation Confidential Do Not Copy VG921m 2 G Color Pattern Figure5 B Color Pattern Figure 6 Full White Patter Figure 7 Dark Screen Pattern Figure 8 Black White Pattern Figure 9...

Page 20: ...EDID program Make sure it can pass test program 1 5 5 Fine Tune and Sharpness Test Signal 1280x1024 60Hz Test Pattern Line Moire Pattern Check and see if the image has noise and focus performs well El...

Page 21: ...reen Pattern Check and see if there are dead pixels on LCD panel with shadow gauge and filter film The total numbers and distance of dead pixels should be compliant with the spec 1 5 11 Mura Test Patt...

Page 22: ...d restore the factory defaults You should do Memory Recall again 1 5 15 Power Off Monitor Turn off the monitor by pressing Power button 2 Firmware Upgrade Procedure When you receive the returned monit...

Page 23: ...ic Corporation Confidential Do Not Copy VG921m 2 ISP tool Use 12V adapter ISP Download program procedure Hardware Connect status Version update 1 Check Monitor model 2 Check Firmware version ISP conne...

Page 24: ...e VG921m follows the same setting procedure 1 Check Monitor model HC154 2 Check Firmware version HC154_AL_150MX17A01R30 2 ps 3 Update final firmware version HC154_AL_150MX17A01R30 3 ps HC154_AL_150MX1...

Page 25: ...21m follows the same setting procedure 1 Check Monitor model HC154 2 Check Firmware version HC154_AL_150MX17A00R30 2 ps 1 3 Check Panel type HSD150MX17A00 4 Change Panel ps 2 ps 1 HC154_AL_150MX17A00R...

Page 26: ...y exit factory mode 3 Change scaler board 4 Update final firmware version 5 Update EDID code Example VG921m follows the same setting procedure 1 Check Monitor model HC154 2 Check Firmware version HC15...

Page 27: ...g Mstar ISP_Tool Program open Utility Window 3 Enforce Mstar ISP Utility Window s Connect function and Device Type s Dialog window will be opened then press Sure on Dialog window 4 Enforce Mstar ISP U...

Page 28: ...VG921m 2 6 Choose the path and file of Binary code and Program Bin Ready Dialog window will be opened then press Sure on Dialog window 7 Enforce Mstar ISP Auto function of Utility window 8 Enforce Ms...

Page 29: ...26 ViewSonic Corporation Confidential Do Not Copy VG921m 2 9 After writing in the data Enforce Dis Connect function of Mstar ISP Utility window and the burn in procedure will be completed...

Page 30: ...DDC key in 2 If you find the DDC does not conform to the monitor you have to do the DDC key in Equipment Needed VG921m Series Monitor DDC Card PC RS232 cable VGA Cable or DVI Cable DDC Card D8330 RS 2...

Page 31: ...21m 2 Step 2 Modify the column of Week of Manufacture and Year of Manufacture and ID serial Number then press 2B button for changing serial number data Example VX1935wm VG921m follows the same setting...

Page 32: ...gure 2 1 2 Put the cushions on the monitor Figure 3 1 3 Put the Cables in the PE bag Figure 4 Figure 3 Figure 4 1 4 Place the monitor into the carton and then put all the accessories into the carton A...

Page 33: ...m 2 2 Disassembly Procedure 1 Remove the base cover 2 Remove the hinge cover 3 Unfasten 4 pcs of screws to remove base 4 Unfasten 4 pcs of screws with back cover 5 Separate the Cover from the bottom o...

Page 34: ...the cables of Power Key board and remove it 7 Unfasten 2 pcs of screws to remove right speaker 8 Unfasten 2 pcs of screws to remove left speaker 9 Tear off the tape 10 Unfasten 2 pcs of screws to rem...

Page 35: ...921m 2 12 Disconnect the cables of P I A board 13 Tear off the tape with the Shielding 14 Unfasten 5 pcs of screws with Shielding 15 Disconnect the cables of P I board 16 Disconnect the cables of D Su...

Page 36: ...ion Confidential Do Not Copy VG921m 2 18 Disconnect the cables of P I A board 19 Set the short pin before changing new P I A board 20 Unfasten 5 pcs of screws to remove D Sub board 21 Disconnect the c...

Page 37: ...ly Change P I A board ps YES NO Please reconnect power cable NO DISPLAY Please check if signal cable is connected properly Change Panel Please reconnect signal cable YES NO Display panel have horizont...

Page 38: ...io board Display panel have block bar Please change Display panel with missing color Please check signal cable if connected properly and check all pins are good without bent 1 Please check if panel wi...

Page 39: ...DIO U501 TDA7496 SPEAKER 5V SCALAR U401 TSUM57AK INVERTER MP 1038EY DC DC U301 G1117 33 1 8V PANEL DISPLAY AUDIO INPUT CN501 H SYNC V SYNC BL_EN BL BRIGHT R G BINPUT H V SYNC VGA D SUB SCL SDA VGA 5V...

Page 40: ...C224 2 2u C204 0 1uF 16V 1 3 2 Q209 MMBT3906 C221 0 47uF 25V R209 56K 1 16W 2 3 1 D215 BAT54SPT R205 11 5k 1 C212 0 22uF 25V R212 24K 1 16W C225 0 1u NC C218 NC R208 56K 1 16W 1 2 D208 CHPT521S 30 C2...

Page 41: ...ND 20 GND 21 GND 22 GND 23 GND 24 GND 25 GND 26 CN5 AF724L N2GIZ C406 0 1uF 16V TP161 TP146 C403 10uF 16V C405 0 1uF 16V TP151 TP157 1 3 2 VR1 TMC3K B10K TR TP150 C404 10uF 16V C413 10u NC C140 NC TP1...

Page 42: ...COM2 3 COM2 4 COM2 5 NC 6 S1 7 STHR 8 D00N 9 D00P 10 VSS1 11 D01N 12 D01P 13 VSS1 14 D02N 15 DO2P 16 VSS1 17 INV 18 POL 19 STB 20 VSS1 21 CLKN 22 CLKP 23 Osel 24 VSS1 25 MODE 26 V0 27 V1 28 V2 29 V3 3...

Page 43: ...P106 TP104 TP168 C539 0 1uF 16V R501 1K 1 16W C547 0 1uF 16V TP30 R525 NC R155 100 1 16W R523 NC TP170 TP98 TP29 TP103 C540 0 1uF 16V R500 1K 1 16W TP169 R156 100 1 16W 2S1 TP23 TP41 TP120 TP109 1S480...

Page 44: ...S3904 Q3 AO3401 R45 NC R542 NC C38 0 1uF 16V R57 51K 1 16W R543 4 7K 1 16W 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CN3 CONN C164 0 1uF 16V C39 0 1uF 16V D401 3 6V R58 4 7K 1 16W C165 1uF 16V R538 NC C3...

Page 45: ...UDZS5 6B 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 CN4 CONN R179 4 7K 1 16W FB3 60ohm R74 2 2K 1 16W R68 56 1 16W R60 56 1 16W FB4 60ohm D17 UDZS5 6B C51 0 22uF D24 BAV70 3 1 2 D10 BAV99 FB5 60 ohm 3...

Page 46: ...VDDP 115 VDDC 117 AVDD_ADC 60 GND 13 U401 TSUM57AK 1 H3 R194 10K 1 16W Q12 PMBS3906 R192 NC R535 220K 1 16W 1 H12 TP84 C22 0 1uF 16V TP74 D26 LL4148WP R25 15K 1 16W R530 2K 1 16W C B E Q15 CHT2907 R19...

Page 47: ...3 COMP 4 AG 5 FT 6 LCS 7 LCC 8 UGR 17 OUTR 18 VCCR 19 LGR 20 PRL 22 PGR 21 PGL 28 LGL 27 VCCL 26 OUTL 25 UGL 24 BTL 23 U1 R9 R3 R10 C6 IC_VCC IC_VCC R17 G D S Q2 C23 D14 C19 C20 R28 R29 R22 R30 R31 R...

Page 48: ...A K R IC230 R230 1 2 PC201A 12V R231 R263 C261 7 8 INVERTER 3 4 PC201B C120 C123 ZD120 5 2V 3A 5 2V D240 R240B C240 C244 L240 C242 RTN 9 10 ZD121 11 12 F101 CX101 CY101 VA101 1 4 2 3 LF102 TH101 3 2...

Page 49: ...R504 C506 C510 C502 C503 GND 1 GND 2 GND 3 INL 4 VAROUT_L 5 VOLUME 6 VAROUT_R 7 NC 8 INR 9 SVR 10 STBY 11 MUTE 12 GND 13 OUTR 14 VS 15 VS 16 OUTL 17 GND 18 GND 19 GND 20 U501 R510 C505 R505 C509 R507...

Page 50: ...47 ViewSonic Corporation Confidential Do Not Copy VG921m 2 9 PCB Layout Diagrams...

Page 51: ...48 ViewSonic Corporation Confidential Do Not Copy VG921m 2...

Page 52: ...49 ViewSonic Corporation Confidential Do Not Copy VG921m 2...

Page 53: ...50 ViewSonic Corporation Confidential Do Not Copy VG921m 2...

Page 54: ...51 ViewSonic Corporation Confidential Do Not Copy VG921m 2...

Page 55: ...52 ViewSonic Corporation Confidential Do Not Copy VG921m 2...

Page 56: ...53 ViewSonic Corporation Confidential Do Not Copy VG921m 2 SILKSCREEN TOP...

Page 57: ...54 ViewSonic Corporation Confidential Do Not Copy VG921m 2 TOP SIDE...

Page 58: ...55 ViewSonic Corporation Confidential Do Not Copy VG921m 2 10 Exploded Diagram and Exploded Parts List...

Page 59: ...Cover ABS HB Black 1 13 N A 40 09010001G000 VG921m Cable Clipper Up ABS HB Black 1 14 N A 40 09010002G000 VG921m Cable Clipper Down ABS HB Black 1 15 N A 41 03010041G000 VG921 Hinge BKT R SECC T 1mm 1...

Page 60: ...62 07000013G000 8ms sticker 1 6 N A 62 0600003G000 Barcode label 76 2 76 2mm 1 7 DC 00008213 72 01921M02G000 Vg921m packing ass y 1 8 P 00008005 61 03000007G000 Pe bag 500 650mm 1 9 A 00008004 33 E398...

Page 61: ...DC 00008214 72 01921M03G000 20 Packing Assy User Guide QSG CD USA DC 00008215 72 01921M01G000 21 LCD Panel HSD190SEN1 A E 00008260 190SEN1 A04 22 Speaker 1 5W 8R 100mm E 00008261 30 V9211R53G001 23 Bi...

Page 62: ...SECC T 2mm 4 35 N A 41 08010001G000 VG921m Base Plate SECC T 2mm 4 36 N A 42 01120014G000 VG921 mylar transparent 33 2x20 7x0 25t 4 37 M 00008002 42 01260012G000 Mylar 393 318 0 1 for 19 4 38 C 000080...

Page 63: ...cuit Description 5 Adjustment Procedure 6 Troubleshooting Flow Chart 7 Block Diagrams 8 Schematic Diagrams 9 PCB Layout Diagrams 10 Exploded Diagram and Exploded Parts List 11 Recommended Spare Parts...

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