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Service Manual

PA246Q

56

11.5 USB Hub (Upstream/Downstream Port) / Card reader does not work:

1.

Check LDO regulator voltage to 5V is correctly
received and correctly convert to 3.3V & 1.2V

2.

Further more, for the abnormal USB port, power
line of this USB port is advised to check.

1.

If Vcc are OK, check crystal Y1 oscillates.

2.

Reset circuit for USB Hub and Card Reader IC
are advised to check.

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Summary of Contents for PA246Q

Page 1: ...Service Manual PA246Q 1 LCD Monitor Service Manual Model PA246Q V 1 0 RESTRICTIONS ON USE OF MATERIALS ...

Page 2: ...uipment will be jeopardized by the service method selected FOR PRODUCTS CONTAINING LASER DANGER Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure CAUTION The use of optical instruments with this product will increase eye hazard TO ENSURE T...

Page 3: ...With 20 pin DisplayPort connector Video interface with Scaling supported No N A Max resolution mode supported 1920x1200 60Hz Number of Display Colors supported 1 07 billion colors 8 bit A FRC Contrast Ratio 1000 1 typ Dynamic Contrast Ratio 50000 1 The monitor would increase the backlight when display a dark image Scenery Mode under 7 gray scale Theater Mode under 17 gray scale Luminance 1 LCD pan...

Page 4: ...S Duo Secure Digital Mini SD Secure Digital Card Mini Secure Digital w Adaptor TransFlash SD including SDHC MultiMediaCard MMC Reduced Size MultiMediaCard RS MMC NAND Flash xD Card Slots Lower Slot built in Push Ejection Mechanism SD MS MMC xD direct insertion MS Duo Mini SD TransFlash Card RS MMC with adapter Mechanical Tilt base design Yes VESA wall mounting design Yes Mechanical Rotate design Y...

Page 5: ...rk Flammability UL 94 HB Heat deflection To ABS 75 UV stability ABS Delta E 3 0 Resin ABS HB GPPC D350 BASF GP 35 CHEIL SD0150 CHIMEI PA757 LG HF380 KINGFA HP 126 Texture MT 11000 MT 11010 MT 11020 Color DB39A 1 5 Carton Item Condition Spec OK N A Remark Color Color box Material BC Flute Compression strength 400 KGF Burst Strength 18 KGF cm2 Stacked quantity 7 layers ...

Page 6: ...olors 1 07 Billion colors Only HDMI DP 2 2 Brightness Adjustable Range Item Condition Spec OK N A Remark Brightness adjustable range At Max Contrast level Full white color pattern Max brightness value Min brightness value 100 cd 2 3 Acoustical Noise Item Condition Spec OK N A Remark Acoustical Noise Front side distance 30cm Back side distance 4cm Front side 23 dB Back side 28 dB 2 4 Environment It...

Page 7: ...on Operating 91 cm Height 2 corners 2 edges 6 faces 2 6 Electrostatic Discharge Requirements Item Condition Spec OK N A Remark Electrostatic Discharge IEC801 2 standard Contact 8KV Air 15KV 2 7 Reliability Item Condition Spec OK N A Remark MTBF Prediction Refer to Telcordia Bellcore 80 000 Hours goal Excluding the LCD CCFL CCFL Life time at 25 C 2 C 40 000 Hours SA See Note Note The lifetime of LE...

Page 8: ...Service Manual PA246Q 11 2 8 User s hardware control definition ...

Page 9: ...e used in those OSD for CI module Suggest Do not change 5 ButtonTypeC_N_M png This will be used in those OSD for CI module Suggest Do not change 6 ButtonTypeC_N_R png This will be used in those OSD for CI module Suggest Do not change 7 grybar_cursor_b_m png This will be used in those OSD for CI module Suggest Do not change 8 grybar_cursor_f_m png This will be used in those OSD for CI module Sugges...

Page 10: ...menu_button bmp 15 menu_lock bmp menu_lock_hide bmp menu_time bmp menu_channel bmp menu_channel_hide b mp menu_option bmp menu_picture bmp menu_audio bmp 16 volume_ball_blue bmp volume_ball_gray bmp volume_ball_purple bm p volume_ball_purple_hid e bmp ...

Page 11: ..._1 bmp arrow_up_2 bmp arrow_left_1 bmp arrow_left_2 bmp arrow_right_1 bmp arrow_right_2 bmp 18 ball_yellow_down bmp ball_yellow_bg_up bmp ball_gen_bg_up bmp ball_gen_bg_down bmp ball_green_bg_up bmp ball_green_bg_down b mp ball_blue_bg_up bmp ball_blue_bg_down bm p arrow_down_1 bmp arrow_down_2 bmp arrow_up_1 bmp arrow_up_2 bmp arrow_left_1 bmp arrow ...

Page 12: ...bg_down bm p ball_green_bg_down b mp ball_green_bg_up bmp ball_red_bg_up bmp ball_red_bg_down bmp ball_yellow_bg_up bmp ball_yellow_bg_down b mp ball_gen_bg_down bmp ball_gen_bg_ Red 207 49 48 Yellow 254 203 92 Green 166 174 122 Blue 213 89 43 20 list_Bubble bmp list_Bubble_R bmp list_bar_M bmp list_bar_R bmp ...

Page 13: ...title bar on the up 2 Please refer to Item 19 for the bottom of the OSD 22 list_Bubble_info bmp 1 Please refer to Item24 for the title bar on the up 2 Please refer to Item 19 for the bottom of the OSD The detailed firmware functions specification please refer to C212 S W spec document ...

Page 14: ...Duty Panel spec CCFL Frequency 90 264VAC 54KHz 58KHz With 100 Duty Panel spec Power cord Color Black Length 1800mm 50mm 3 2 Signal interface Item Condition Spec OK N A Remark D Sub Color Black Length 1800 mm with blue connector DVI D Color Black Length 1800 mm with white connector HDMI Color Black Length 1800 mm Displayport DP Color Black Length 2000 50mm DP 1 1 protocol USB 2 0 cable Color Black ...

Page 15: ...m differential TDR Scan needed for DisplayPort cable and interface board Note 1 The pin assignment of D sub DVI HDMI DisplayPort connectors are as below 15 pins D sub connector Female Pin Signal Assignment Pin Signal Assignment 1 Red video 9 PC5V 5 volt power 2 Green video 10 Sync Ground 3 Blue video 11 Ground 4 Ground 12 SDA 5 Cable Detect 13 H Sync or H V 6 Red Ground 14 V sync 7 Green Ground 15...

Page 16: ...2 Shield 3 TX 2 TMDS Data 2 4 TX 1 TMDS Data 1 5 SHLD 1 TMDS Data 1 Shield 6 TX 1 TMDS Data 1 7 TX 0 TMDS Data 0 8 SHLD 0 TMDS Data 0 Shield 9 TX 0 TMDS Data 0 10 TX CLK TMDS Clock 11 TX CLK SHLD TMDS Clock Shield 12 TX CLK TMDS Clock 13 CEC Consumer Electronic Control 14 NC No Connect 15 DDC Clk DDC Clock 16 DDC Data DDC Data 17 GND CED and DDC Ground 18 5V 5V Power from the media box 19 HPD Hot ...

Page 17: ...D sub input 2 509 ns 50 of minimum pixel clock period 1920x1200 60Hz max support timing Settling Time after overshoot undershoot 5 final full scale value Refer to VESA VSIS Standard V1R1 Overshoot Undershoot 12 of step function voltage level over the full voltage range Refer to VESA VSIS Standard V1R1 3 4 Scan range Item Condition Spec OK N A Remark Horizontal 31 83 KHz Vertical 50 76 Hz Without F...

Page 18: ...ESA 1280x1024 63 98 P 60 02 P 108 00 1920x1200 VESA 1280x1024 79 98 P 75 02 P 135 00 1920x1200 VESA 1366x768 47 712 P 59 79 P 85 50 1920x1200 VESA 1440x900 55 94 N 59 89 P 106 50 1920x1200 CVT 1 30MA 1600x1200 75 00 P 60 00 P 162 00 1920x1200 VESA 1680x1050 65 29 N 60 00 P 146 25 1920x1200 CVT 1 76MA 1920x1080 67 5 P 60 00 P 148 5 1920x1200 VESA 1920x1200 Reduced Blanking 74 038 P 59 95 N 154 1920...

Page 19: ...hub board and an interface BD The block diagram is shown as below A Interface Board A basic operation theory for this interface board is to convert analog signals of Red Green and Blue to digital signals of Red Green and Blue and to provide DVI port equipped with HDCP key for receiving DVI signal to generate high quality image In addition it provides HDMI and Displayport input ports equipped with ...

Page 20: ...8028 is an all in one LCD monitor controller supporting WUXGA and integrates ST high performance ADC TMDS Rx with HDCP scaling engine OSD engine LVDS Tx and so on 2 EEPROM We use 24C32 to store all the adjustable data and user settings The HDCP KEY is stored in it 3 Serial Flash It controls all the functions of this interface board just like the OSD display setting the adjustable items adjusted da...

Page 21: ...ection against feedback loop disconnection inhibit for zero current consumption and thermal shutdown Pin Assignment of L4978 Pin No Names Function 1 GND Ground 2 SS_INH A logic signal active low disables the device sleep mode operation A capacitor connected between this pin and ground determines the soft start time When this pin is grounded disables the device driven by open collector drain 3 OSC ...

Page 22: ...Service Manual PA246Q 25 5 Schematic Diagram 5 1 Power Board ...

Page 23: ...Service Manual PA246Q 26 5 2 Control Board ...

Page 24: ...Service Manual PA246Q 27 5 3 Interface Board ...

Page 25: ...Service Manual PA246Q 28 ...

Page 26: ...Service Manual PA246Q 29 ...

Page 27: ...Service Manual PA246Q 30 ...

Page 28: ...Service Manual PA246Q 31 ...

Page 29: ...Service Manual PA246Q 32 6 PCB layout 6 1 Power Board ...

Page 30: ...Service Manual PA246Q 33 6 2 Control Board 6 3 Interface Board ...

Page 31: ...2 sec will enter the factory mode 2 Select timing mode from table 1 and input full screen display pattern to monitor 3 Press Splendid button Key and hold for 2 seconds to run AUTO adjustment function for geometry adjustment 4 Clear user area in EEPROM 5 Check if the position phase and clock of the image are ok or acceptable to make sure function and performance are ok 6 Turn off the monitor power ...

Page 32: ...ode x 0 283 0 015 y 0 297 0 015 Color temperature 9300K set on OSD Y 200 x 0 313 0 015 y 0 329 0 015 Color temperature 6500K set on OSD Y 270 x 0 346 0 015 y 0 359 0 015 Color temperature 5000K set on OSD Y 230 6 Turns off the monitor power Writing EDID file Analog DVI D HDMI and DP 1 Setup a PC with DDC card 2 Connect PC to monitor with a D sub signal cable 3 Provided the AC power to monitor 4 Pl...

Page 33: ...face Board OSD shown when key pressed No Yes Follow instructions from OSD dialog Keypad OK Yes No Screen is Blank and Power LED is white Backlight turned ON Scalar output Data Yes Proceed to Check Power Board No Yes Check LCD Module No Proceed to Check Scalar Proceed to Check Control Board ...

Page 34: ...ntrol board PCB OK No Replace a new control board then retry Is botton key normally Yes No Replace the components then retry Check interface board Scalar GPIO function TP48 TP49 TP50 then proceed to check Scalar Yes Is control BD connecting No Yes Plug control board then retry ...

Page 35: ...Service Manual PA246Q 54 11 3 Check Scalar ...

Page 36: ...Service Manual PA246Q 55 11 4 Check LCD Module ...

Page 37: ... Check LDO regulator voltage to 5V is correctly received and correctly convert to 3 3V 1 2V 2 Further more for the abnormal USB port power line of this USB port is advised to check 1 If Vcc are OK check crystal Y1 oscillates 2 Reset circuit for USB Hub and Card Reader IC are advised to check ...

Page 38: ...Check Inverter No Yes Check Power BD I F BD Check CN801 Pin 7 BL_ADJ Voltage 3 3V High or PWM Signal No Yes Check Power BD I F BD Check CN801 Pin 1 5 Voltage 24V No Yes Check Power BD Yes Replace Inverter BD Check CN801 Pin 6 BL_ON Voltage 3 3V High ...

Page 39: ... Check Inverter BD I F BD Check CN801 Pin 1 5 Voltage 24V Replace F701 F702 No Check F701 F702 Check Q701 Q702 IC701 No Replace Q701 Q702 IC701 Yes Check V IF 5V Voltage 5V Yes Check D881 D882 IC881 No Replace D881 D882 IC881 No Replace Q852 D853 IC851 No Check Q852 D853 IC851 Check Q851 D851 D852 IC701 No Replace Q851 D851 D852 IC701 Yes Yes Yes Yes ...

Page 40: ...Service Manual PA246Q 59 11 8 Check PFC Function ...

Page 41: ...Service Manual PA246Q 60 12 Exploded View ...

Page 42: ...Service Manual PA246Q 61 ...

Page 43: ... 18R03 001 WIRE FFC 8P CTRL BD PA246 1 50 TRIVIAL POWER BOARD wire_to Panel 5K 18R01 001 WIRE 14 12P 1061 24 PWR PA246 1 50 TRIVIAL POWER BOARD wire 5K 18R02 001 WIRE 12 13P 1571 24 PWR PA246 1 50 TRIVIAL USB BOARD wire 5K 18R05 001 WIRE 7 11P 28 PA246 1 50 TRIVIAL Tape 3H 04054 071 TAPE ADHESIVE 35 25 BLK 7651F 1 100 TRIVIAL Label_SPEC 4E 0VU01 041 LBL SPEC 88 28 PA246 WW 1 100 TRIVIAL Label_Prev...

Page 44: ... 17Y05 001 WARRANTY ASUS TW NONZBD LCDLED 1 20 ACCESSORY Warranty Card_NA 4J 17Y04 001 WARRANTY ASUS NA NONZBD LCD 1 20 ACCESSORY User s Guide 4J 18R01 001 GUIDE QS 31L ASUS PA246 1 20 ACCESSORY DVI Cable 5K 05407 511 CABLE DVI D DVI D 1 8M IS_8 1 50 ACCESSORY USB Cable 5K L1E04 501 CABLE USB 2 0A B 1 8M OD3 8 1 50 ACCESSORY D SUB Cable 5K L2H06 511 CABLE SIGNAL C H V OD_5 5 1 8M 1 50 ACCESSORY DP...

Page 45: ...Service Manual PA246Q 64 Photos of Recommended Parts List 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ...

Page 46: ... 50 v v v v V TRIVIAL KEY BOARD wire 5K 18R03 001 WIRE FFC 8P CTRL BD PA246 1 50 v v v v V TRIVIAL POWER BOARD wire_to Panel 5K 18R01 001 WIRE 14 12P 1061 24 PWR PA246 1 50 v v v v V TRIVIAL POWER BOARD wire 5K 18R02 001 WIRE 12 13P 1571 24 PWR PA246 1 50 v v v v V TRIVIAL USB BOARD wire 5K 18R05 001 WIRE 7 11P 28 PA246 1 50 v v v v V TRIVIAL Tape 3H 04054 071 TAPE ADHESIVE 35 25 BLK 7651F 1 100 v...

Page 47: ...001 WARRANTY ASUS TW NONZBD LCDLED 1 20 v ACCESSORY Warranty Card_NA 4J 17Y04 001 WARRANTY ASUS NA NONZBD LCD 1 20 v ACCESSORY User s Guide 4J 18R01 001 GUIDE QS 31L ASUS PA246 1 20 v v v v V ACCESSORY DVI Cable 5K 05407 511 CABLE DVI D DVI D 1 8M IS_8 1 50 v v v v V ACCESSORY USB Cable 5K L1E04 501 CABLE USB 2 0A B 1 8M OD3 8 1 50 v v v v V ACCESSORY D SUB Cable 5K L2H06 511 CABLE SIGNAL C H V OD...

Page 48: ...B 2 PC 4 3H 02088 001 SOLDER PASTE LF310 1 18 G 4 4E 00091 021 LBL ART 25 4 5 ALL 1 PC 4 4E 10101 071 LABEL B SERIAL ART 12 5 ALL 1 PC 4 4H 18R01 A00 PCB I F BD PA246 1 PC 4 6C 10031 161 CHIP RES 10 J 1 8W 0805 2 PC 4 6C 10034 1D1 CHIP RES 10 J 1 16W 0402 16 PC 4 6C 10134 1D1 CHIP RES 100 J 1 16W 0402 14 PC 4 6C 10234 1D1 CHIP RES 1K J 1 16W 0402 10 PC 4 6C 10334 1D1 CHIP RES 10K J 1 16W 0402 24 P...

Page 49: ...STOR 24V PGB1010603NR 1 PC 4 8B 31966 201 XTAL 19 6608M18PF30PPM 11 4 9 1 PC 4 8C 00032 016 DIODE SW BAS32L 75V0 2A SOD80 2 PC 4 8C 00054 C81 DIODE SB BAT54C 30V SOT 23 1 PC 4 8C 00070 A11 DIODE SW BAV70 75V SOT 23 2 PC 4 8C 00199 0A1 DIODE ARRAY AZC199 04S SOT23 3 PC 4 8C 00524 0A0 DIODE ARRAY RCLAMP0524P 10P 2 PC 4 8C 00998 011 DIODE SW BAV99 8 SOT23 5 PC 4 8C 01045 0A0 DIODE ARRAY AZ1045 04QU M...

Page 50: ... 10K J 1 8W 0805 2 PC 4 6C 10333 151 CHIP RES 10K J 1 10W 0603 1 PC 4 6C 22031 161 CHIP RES 22 J 1 8W 0805 1 PC 4 6C 22033 151 CHIP RES 22 J 1 10W 0603 2 PC 4 6C 22333 151 CHIP RES 22K J 1 10W 0603 3 PC 4 6C 27232 111 CHIP RES 2 7K J 1 4W 1206 2 PC 4 6C 30031 161 CHIP RES 30 J 1 8W 0805 2 PC 4 6C 33132 111 CHIP RES 330 J 1 4W 1206 1 PC 4 6C 33133 151 CHIP RES 330 J 1 10W 0603 1 PC 4 6C 33233 151 C...

Page 51: ... 25 D1 5 2 PC 4 3D 0Q402 001 HSINK AL 20 45 8 1908FP BLK 1 PC 4 8F 00003 143 SCRW TAPTILE PAN 4 40 3 8 2 PC 3 6K 18R09 001 ASSY ASSY HSINK L1S02 AP9575G 2 PC 4 0F 09575 020 FET MOS PC AP9575GI TO 220CFM 2 PC 4 3D L1S02 001 HEATSINK AL 20 7 15 F2105 2 PC 4 8F 1A524 6R0 SCRW MACH PAN M3 6L NI 2 PC 3 6K 18R10 001 ASSY HSINK L2K04 SPA11N80C3 1 PC 4 0F 11803 020 FET MOS SPA11N80C3 NC TO 220F 1 PC 4 3D ...

Page 52: ...4 6J 47500 051 FUSE PTC 0 75A8V 1206L075THYR 2 PC 4 8B 30024 302 XTAL 24MH30PF30PPM 12 4 9 4 5 1 PC 4 8C 00099 E11 DIODE SW 215A75V BAV99 SOT23 4 PC 3 5K 18R05 001 WIRE 7 11P 28 PA246 1 PC 2 GC 18R72 QL1 DC PA246Q LGDEU 1A1D1H1DP USB 1 PC 3 3D 18R02 001 SHD USB PA246 1 PC 3 3H 04054 071 TAPE ADHESIVE 35 25 BLK 7651F 1 PC 3 3H 04054 081 TAPE ADHESIVE 60 25 0 2T BLK 1 PC 3 3J 18R02 011 RC ABS DB39A ...

Page 53: ... 2G 00921 001 CORD H05VV F 10A250V EUR 1 8M 1 PC 2 3H 04605 482 TAPE 0 055 60 900M 3M373 ASUS 1 7875 M 2 3H 11001 001 FILM LLDPE 500W 0 0155T ROLL M 0 0042 KG 2 3H 19L14 421 PALLET WOOD S B 914 1366 0 0358 PC 2 4B 0GT13 002 BAG LDPE 310 220 SELF GIVEN 0 1429 PC 2 4B 0GT13 011 BAG LDPE 310 220 ZIPPER W O TP 1 PC 2 4B 18R04 011 BAG EPE HDPE 600 700 1 PC 2 4B 18R05 001 HOLDER HAND BK 146 40 ASUS 1 PC...

Page 54: ...al Plastic to metal PCB to metal None tread 8 10 Have tread 6 8 Aluminum 4 5 Æ2 68 0 03 2 7 8F VZ524 6R0 SCRW TAP FLAT EXT M3 6L C ZN Metal Metal to metal None tread 8 10 Have tread 6 8 Aluminum 4 5 Æ2 68 0 03 2 8 8F 00518 100 SCRW TAP W FL M3 10L S3 8 ZN Metal Metal to metal Plastic to metal SPEAKER to metal None tread 8 10 Have tread 6 8 Aluminum 4 5 Æ2 68 0 03 2 9 8F 00003 143 SCRW TAP PAN 4 40...

Page 55: ... Plastic to plastic PCB to plastic 4 0 0 5 Φ2 0 0 05 1 24 8F WA314 8R 0 SCRW TAP CAP M3 1 34P 8L B ZN Plastic Metal to plastic Plastic to plastic 5 0 1 0 Φ2 35 0 05 2 25 8F XA224 6R0 SCRW TAP FH M3 6L ZN PLASTIC 4 5 0 5 Φ2 35 0 05 2 26 8F XA314 8R0 SCRW TAP FLAT M3 1 34P 8L B ZN Plastic Metal to plastic Plastic to plastic 4 5 0 5 Φ2 35 0 05 2 27 8F 00607 8R0 SCRW TAP FPH M3 8L 5 0 8 B ZN Plastic M...

Page 56: ... 2 14 8F MA325 6R0 SCRW TAP FLAT P M3 6L B ZN No thread 8 5 1 0 Thread 6 5 1 0 Aluminium 4 5 1 0 M3 2 15 8F VG434 4R0 SCRW TAP PAN F WSH M3 4L C ZN No thread 8 5 1 0 Thread 6 5 1 0 Aluminium 4 5 1 0 M3 2 16 8F EA524 6R0 SCRW TAP FH M3 6L NI 6 5 1 0 M3 2 17 8F 5A556 6R0 SCRW MACH FH M4 6L NI NYL 6 5 1 0 M4 2 18 8F WA314 8R0 SCRW TAP CAP M3 1 34P 8L B ZN 4 5 1 0 M3 2 19 8F MA524 4R0 SCRW TAP FPH M3 ...

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