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ViewSonic VA502mb-1 Service Manual

15” color tft lcd display
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Service Manual

ViewSonic VA502mb-1
Model No. VS11352
15" Color TFT LCD Display
(VA502mb-1_SM Rev. 1a Dec. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VA502mb-1

  • Page 1: Service Manual

    Service Manual ViewSonic VA502mb-1 Model No. VS11352 15” Color TFT LCD Display (VA502mb-1_SM Rev. 1a Dec. 2006) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: Revision History

    Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

  • Page 3: Table Of Contents

    Specification Front Panel Function Control Description Circuit Description Adjustment Procedure Troubleshooting Flow Chart Block Diagram Schematic Diagrams PCB Layout Diagrams 10. Exploded Diagram and Exploded Parts List 11. Recommended Spare Parts List ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 4: Precautions And Safety Notices

    Keep wires away from high voltage, high temperature components and sharp edges. Keep wires in their original position so as to reduce interference. Usage of this product please refer to also user’s manual. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 5 That may cause “Mura.” Placing the monitor on foreign objects. That Place the monitor on a clean and soft foam could scratch the surface of the panel or cause pad. “Mura.” ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 6 Place the monitor on the lap, the panel surface The panel is placed facedown on the lap. That must be upwards. may cause “Mura.” ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 7: Specification

    Humidity (%) 10 % - 85 % Temperature ( / ) -4℉~140℉ / -20℃~60℃ ℉ ℃ Storage Condition Humidity (%) 5 % - 85 % Regulation UL, cUL, TUV/GS, TUV/ERGO (cover ISO13406-2), ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 8 2001 and Hot Plug Detect &DDC Audio Cable (1.8m, Color: black) with PC 2001 ViewSonic CD Wizard English, Spanish, Portuguese, ViewSonic Quick Start Guide Screen Protector Mylar Hi Pot label QA pass label Hg Warnning label Warranty Sticker Warranty Card...

  • Page 9: Front Panel Function Control Description

    3. Front Panel Function Control Description Do the following to adjust the display setting: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 10 ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 11: Circuit Description

    4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION The main board contains panel control logic, brightness control logic; DDC and DC convert DC circuit and so on. Power board MST8011B Backlight and Panel Audio board EPROM EPROM Key board ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 12 Feedback Voltage Circuit Control Control 4.4 INTRODUCTION OF IC MST8011B (U401): integrate ADC, OSD, SCALER, LVDS, convert analog RGB into digital and room and shrink scaling output to LCD panel. PIN Function: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 13 ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 14 ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 15 The idle mode turns off the processor clock but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 16 PIN Descriptions: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 17: Circuit Diagram

    @ Powerdip 14+3+3 package, specially designed for high quality sound, TV and Monitor applications. Features of the TDA7496L include linear volume control, Stand-by and mute functions. The function of each pin and the inside circuit diagram are as follows: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 18 Block Diagram PIN Function ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 19 It is designed for the switching adaptor with 30W~60W output, offered in both SOP-8 and DIP-8 package. The function of each pin and the inside circuit diagram are as follows: PIN Descriptions: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 20 Dead time over the whole range of possible to adjust half period of whole duty range. Recommendable for regulator in camcorder. The function of each pin and the circuit diagram inside are as follows: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 21 Output 2 dead time/soft start setting Output for error amplifier 2 INV2 Negative input for error amplifier 2 NON2 Positive input for error amplifier 2 Timing latch setting VREF Reference voltage(2.5v) output Block Diagram ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 22: Adjustment Procedure

    6500 color temp. parameter is Wx = 0.313±0.03;Wy = 0.329 ±0.03; Y = 200 ±20 cd/m C. MEM.CHANNEL10 ( SRGB color): 6500 color temp. parameter is Wx = 0.313±0.03;Wy = 0.329 ±0.03; Y = 200 ±20 cd/m ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 23 (6). Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100 (7). Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±5 ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 24 640x480@60Hz 640x480@60Hz 720x480@60Hz OSD Time Out 15 Sec In SOG and Composite, 720x480@60Hz 640x480@60Hz OSD Background Enabled In SOG and Composite, 1152x864@75Hz 1152x870@75Hz Resolution Notice Enabled In SOG and Composite, 1280x768@60/75/85Hz 1024x768@60/75/85Hz ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 25 1152 x 864 @ 75Hz 1152 x 870 @ 75Hz 1280 x 720 @ 60Hz 1280 x 960 @ 60Hz 1280 x 960 @75Hz 1280 x 1024 @ 60Hz 1280 x 1024 @ 75Hz ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 26 White Screen & Dark should be compliant with the Figure 7,8 Pixel/Line Screen spec. The screen must have the pure White Balance White & Black Pattern white and black pattern, no Figure 9 other color. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 27 Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2) Horizontal & Vertical Thickness Pattern R. Color Pattern (Figure 4) (Figure 3) G. Color Pattern (Figure 5 B. Color Pattern (Figure 6) ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 28 Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls) - Make sure the F/W is the latest version. Test Pattern: EDID program Make sure it can pass test program. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 29 The total numbers and distance of dead pixels should be compliant with the spec. Mura Test Pattern: White, RGB, Black, & Grey Test Tool: 10% ND Filter Check if the Mura can pass 10% ND Filter. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 30 After final QC step, we have to erase all saved changes again and restore the factory defaults. You should do “All Mode Reset” again. Power Off Monitor Turn off the monitor by pressing “Power” button. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 31 - VGA Cable (P/N: 42.59901.003) *1(Pin 4, 11 should be connected to GND) - PC (Personal Computer) - LPT Cable (P/N: 42.59906.001) *1 - Firmware Upgrade Program - One additional monitor for checking the program execution ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 32 P1：to VGA Cable P3：to Signal Generator P2：to LPT Cable 3 Firmware Upgrade Procedure Step 1. Let VA502mb/VA702mb set to be connected with AC cable and VGA cable. Step 2.Execute the MSstar ISP tool. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 33 Step 4. Click “Connect” button. (On this step, if the connection is successful, the “Entry ISP Mode” Dialog will be showed. If not, the error dialog will be done.) Step 5. Click “Device” button. Select the “PMC25LV010” or “SST25VF010” viewed on your set. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 34 Step 7. Click “Auto” button. Execute the flashing action by clicking the “Run” button. Step 8. If the flashing F/W has been completed, “Ok” message will be showed on the right TextBox. ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 35 PC by LPT Cable. 3.2.3 Plug Power Adapter to Fixture. 3.2.4 Connect Power Cord to VA502mb/VA702mb Monitor. 3.2.5 Connect PC to the additional monitor. JP1： Power Adapter P2： VGA Cable P1：to LTP Cable ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 36 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program Sep2:Inpute the S/N and execute “Enter” ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 37 Sep3: Key the “Enter” and write the data Sep4: If ddc program OK and show “data compare ok” ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 38 5.7 Packing Procedure ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 39 5、 Disassemble the screws for main board, power board, audio board and the connector or wire. （Picture 7,8） 6、 Disassemble the screws for the shielding. (Picture 9,10) 7、 The panel. (Picture 11) 7.1.3 Show pictures （Picture 1） （Picture 2） ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 40 （Picture 3） （Picture4） （Picture 5） （Picture 6） （Picture 7） ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 41 （Picture 8） （Picture 9） （Picture 10） （Picture11） ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 42: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 43: Block Diagram

    7. Block Diagram ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 44: Schematic Diagrams

    VLCD VAA2 VAA3 VAA4 VCC5V onBACKLITE 5.PANEL INTERFACE onPanel_5V/3.3V VCPU VCC12V VCC3.3 VCC2.5 AdjBACKLITE AdjBACKLITE VAA1 VLCD VAA2 VAA3 VAA4 VCC5V VLCD 4.SCALER ViewSonic Corporation 2.POWER Model Title MAIN BOARD Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 45 R216 R215 Q203 AO3401 0Ω 1/16W R207 4.7KΩ 1/16W 100KΩ 1/16W C217 Q204 onPanel_5V/3.3V 0.068uF PMBS3904 4.7KΩ 1/16W C207 C208 R211 100uF/16V 0.1uF 10KΩ 1/16W ViewSonic Corporation Model Title POWER Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 46 DAT4- DAT5+ DAT5- CLK+ clk+ CLK- clk- JACK D306 D307 D308 D309 D310 D311 D312 D313 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 VCC5V ViewSonic Corporation Model Title INPUT Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 47 14.318MHz VAA4 XOUT C403 22pF 600 OHM BUS TYPE/NC C404 0.1uF C427 BYPASS R401 10uF/16V AVSS_LPLL C428 0.1uF R401 R402 Direct Bus 4.7K 4.7K 3-WIRE ViewSonic Corporation Model Title SCALER Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 48 RXE3- RXE3+ LVA3P LVB3M LVBCKP LVBCKM LVB2P LVB2M CONN R502 LVB1P LVB1M 0Ω 1/16W LVB0P VLCD LVB0M VLCD C509 C510 C511 47uF/16V 0.1uF 0.1uF ViewSonic Corporation Model Title PANEL INTERFACE Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 49 R623 470Ω 1/16W LEFT POWER R624 470Ω 1/16W Mute_key OUT-R+ C606 C608 C610 OUT-L+ C616 C609 OUT-R- OUT-L- C607 0.001uF 0.001uF 0.001uF 1uF/25V 0.001uF 0.001uF CONN ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 50 C221 12KΩ 1/16W 1uF/25V 470Ω 1/16W 0.47uF/25V C207 4.7uF R207 C204 0.1uF U201 BAF9741F C208 R204 330pF 10KΩ 1/16W is power GND is signal GND ViewSonic Corporation Model Title INVERTER Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 51 100Ω 1/16W 2PA733P IC903 HTL431 Q902 R928 2PC945P 1KΩ 1/10W C935 R926 C910 R911 0.01uF 24KΩ 1/10W 0.1uF 4.7KΩ 1/16W CN901 CN301 CN302 SOCKET PHONEJACK CONN ViewSonic Corporation Model Title POWER Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 52 WAFER 4P2.0 R/A STBY VAROUT_R R207 R208 MUTE VAROUT_L R210 R211 C212 C211 C209 C210 C213 C208 100 pF 1.0uF 1.0uF 0.1uF 470uF/16V 100 pF ViewSonic Corporation Model Title AUDIO BOARD Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 53: Pcb Layout Diagrams

    9. PCB Layout Diagrams MAIN BOARD ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 54 POWER BOARD ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 55 ViewSonic Corporation ViewSonic Corporation Confidential - Do Not Copy Confidential - Do Not Copy VA502mb-1 VA502mb-1...
  • Page 56 ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 57 AUDIO BOARD ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 58 KEY BOARD ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...

  • Page 59: Exploded Diagram And Exploded Parts List

    10. Exploded Diagram and Exploded Parts List ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 60 EXPLODED PARTS LIST (VA502mb-1) ViewSonic Model Number: VS11352 Rev: 1a Serial No. Prefix: QA8 Item ViewSonic P/N Ref. P/N Description Q't y N /A 78G314-2-G Speaker B-00008246 KEPC560KE3O9P Ke y pad N /A 81G12-2-GP N /A Q33G4713-E7-1L KEY PAD N /A...
  • Page 61 Packing for Shipping ViewSonic Corporation Confidential - Do Not Copy VA502mb-1...
  • Page 62 PACKING PART LIST ( VA502mb-1 ) ViewSonic Model Number: VS11352 Rev: 1a Ite m ViewSonic P/N Ref. P/N Location Q't y N /A 44B352-6 Carton N /A Q50G600-2/3 HANDLE 1/2 N /A Q45G76-28-CK2 PE BAG N /A Q70G1500-709-1B CD manual...

  • Page 63: Recommended Spare Parts List

    All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions. ViewSonic Corporation...

  • Page 64: Viewsonic Corporation

    BOM LIST ( VA502mb-1 ) ViewSonic Model Number: VS1135 Rev: 1a Serial No. Prefix: QA8 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00008245 CBPC560KV8V29P CONVERSION BOARD B-00008246 KEPC560KE3O9P KEY BOARD B-00008247 PKCC1521SVE1P POWER BOARD B-00008244 AUPC560KBO9P AUDIO BOARD...
  • Page 65 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 037G 495 1 HINGE ASS'Y 0Q1G1030 8128 CR3 SCREW 0Q1G1030 10128 CR3 SCREW Q34G1273 E7 1L STAND B-00008244 AUPC560KBO9P AUDIO BOARD 033G802414C H 2*7PIN DUAL ROW RIGHT ANGLE H CN202...
  • Page 66 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 065G 2K152 5E6921 1500 PF 10% 2KV Y5P C906 065G 6J2206E3 R 22PF J 6KV NP0 C215 065G 6J2206E3 R 22PF J 6KV NP0 C216 065G305M1022BP Y2 1000PF M 250VAC Y5P...
  • Page 67 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q202 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q201 057G 417 6 PMBS3906/PHILIPS-SMT(06) Q602 057G 417 6 PMBS3906/PHILIPS-SMT(06) Q601 057G 763 1 A03401 SOT23 BY AOS(A1) Q203 061L 125472 8 CHIP AR 8P4R 4.7K OHM+-5%1/16W...
  • Page 68 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 061L0603472 CHIPR 4.7K OHM +-5% 1/16 R619 061L0603472 CHIPR 4.7K OHM +-5% 1/16 R616 061L0603472 CHIPR 4.7K OHM +-5% 1/16 R212 061L0603472 CHIPR 4.7K OHM +-5% 1/16 R207 061L0603472 CHIPR 4.7K OHM +-5% 1/16...
  • Page 69 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 071G 56Z601 CHIP BEAD 600 OHM 0805 FB405 071G 56Z601 CHIP BEAD 600 OHM 0805 FB404 071G 56Z601 CHIP BEAD 600 OHM 0805 FB403 071G 56Z601 CHIP BEAD 600 OHM 0805...
  • Page 70 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 061L0603000 RST SM 0603 JUMP MAX 0R0 R208 061L0603000 RST SM 0603 JUMP MAX 0R0 R929 061L0603101 CHIPR 100 OHM +-5% 1/16W R218 061L0603102 CHIPR 1K OHM +-5% 1/16W R931...
  • Page 71 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 095G 90 23 JUMPER J202 095G 90 23 JUMPER J201 488 N/A 061G 60220152T CFR 200 OHM +-5% 1/6W R212 489 N/A 067G 3054713XT 470 uf 16v C208 490 N/A...
  • Page 72 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 556 N/A 067G 2154797NT LOW ESR 4.7UF+-20% 50V BY CHEM C207 557 N/A 067G 3052207NT GP KME50VB22M-TP5 5*11 C907 558 N/A 093G 6026W52T FR107 D901 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 73 Add: Tel: Fax: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com) ViewSonic Corporation Confidential - Do Not Copy...

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