Lenovo LXM-L19BH Service Manual Download Page 28

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Lenovo LXM-L19BH

Page 28 of 44

8.2 TROUBLE SHOOTING

8.2.1 MAIN BOARD

1.NO SCREEN APPEAR

Note:1. If replace “MAIN-BOARD”, Please re-do “DDC-content” programmed & “WHITE-Balance”.

2. If replace “Power Board” only, Please re-do “ WHITE-Balance”

Led Green

Measured CN801 pin5/6 = 12V?

Measured CN801 pin 9/10= 5V?

Measured U802 pin 2= 3.3V?

Check Correspondent component.

Is there any shortage or cold solder?

Yes. There is OSD show

Yes, all DC level exist

Disconnected the Signal cable (Loose the

Signal cable), Is the screen show “Cable Not

Connected”?

Connected the Signal cable again,

Check LED status.

Replace U401

Show noting

Connected the Signal cable

again

Check Power switch is in Power-on

status, and check if Power switch had

been stuck?

Led Orange

OK, Keyboard no stuck

Led orange

Led Green

Check the Wire-Harness from CN503

Measured RGB (R318, R319, R320)

H,V Input at U401 pin 181,182 ,does

there have signal ?

Check digital signal from CN301

Check Correspondent

component short/open

(Protection Diode)

OK, Wire tight enough

Check Panel-Power Circuit Block

OK, Panel Power OK

Check U401 Data-output Block

Replace Power board and Check

Inverter control relative circuit

Re-do White balance adjust

OK, input Normal

Measured Crystal X401 (14.318MHz)

OK, clock normal

Replace U401 (GM2321)

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Summary of Contents for LXM-L19BH

Page 1: ...CE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OFTHIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES ERRORS OR OMISSIONS MANUFACTURE DATA May 24 2005 h t t p w w w w j e l n e t ...

Page 2: ...Y ROOM TEMPERATURE 25 4 10 4 4 PANEL SPECIFICATION 11 5 BLOCK DIAGRAM 13 5 1 SOFTWARE FLOW CHART 13 5 2 ELECTRICAL BLOCK DIAGRAM 15 5 2 1 SCALAR BOARD BLOCK DIAGRAM 15 5 2 2 INVERTER POWER BOARD BLOCK DIAGRAM 17 6 SCHEMATIC 19 6 1 MAIN BOARD 19 6 2 INVERTER BOARD 26 7 PCB LAYOUT 27 7 1 MAIN BOARD 27 7 2 POWER INVERTER BOARD 28 8 MAINTAINABILITY 29 8 1 EQUIPMENT AND TOOLS REQUIREMENT 29 8 2 TROUBLE...

Page 3: ...Lenovo LXM L19BH Page 3 of 44 Revision List Revision Date Change Description h t t p w w w w j e l n e t ...

Page 4: ...ency 135MHz Max Frequency 1280 x 1024 Drug and Play VESA DDC2BTM Input Interface D Sub 15Pin Input Signal Analog 0 7Vpp Positive Signal 75 Ohm Max Display Area Horizontal 376 32mm Vertical 301 06mm Power DC 12VDC 3 5A Environmental Temperature Humidity Operating Temperature 0 C to 40 C 32 F to 104 F Storing Temperature 20 C to 60 C 4 F to 140 F Operating Humidity 10 to 85 Weight net 4 4kg ON Mode ...

Page 5: ...el control logic brightness control logic and DDC The Inverter board will drive the backlight of panel and the DC DC conversion Video signal DDC Inverter Power board Flat Panel and CCFL backlight Main Board Keyboard RS232 Connector For white balance adjustment in factory mode HOST Computer CCFL Drive DC IN 100V 240V Monitor Block Diagram h t t p w w w w j e l n e t ...

Page 6: ...an be adjusted to your personal preferences The power cord should be connected Connect the video cable from the monitor to the video card Press the power button to turn on the monitor the power indicator will light up 3 2 CONTROL BUTTON Power Indicator condition Green Power On mode Orange Power Saving mode 1 Auto Adjust Exit 2 Brightness Adjust 3 Contrast Adjust 4 Menu Select 5 Power Indicator 6 P...

Page 7: ...tal position Adjust Position Vertical Position Adjust the vertical position Phase Adjust the Phase Video Noise Clock Adjust the Clock Language Set OSD Language OSD Timer Set the display time of OSD menu Color Temperature Color Temperature choose 7800K 6500K user mode OSD Horizontal Adjust the Horizontal Position of OSD menu OSD Position OSD Vertical Adjust the Vertical Position of OSD menu Exit OS...

Page 8: ...D Sub Signal PIN NO DESCRIPTION PI N NO DESCRIPTION 1 Red 9 5V 2 Green 10 Logic GND 3 Blue 11 GND 4 Ground 12 DDC Serial Data 5 Ground 13 H Sync 6 R Ground 14 V Sync 7 G Ground 15 DDC Serial Clock 8 B Ground VGA Connector layout 1 5 6 10 11 15 h t t p w w w w j e l n e t ...

Page 9: ... BRINGTHNESS Vadj 5 0V LOAD 120KΩX4 ITEM SYMBOL MIN TYP MAX UNIT REMARK Input voltage Vin 10 8 12 13 2 V Input current Iin 2200 2450 mA FOR 4 LOAD Output Current Iout 6 0 6 5 7 0 mA FOR 1 LOAD Frequency F 52 0 57 0 62 0 KHZ FOR 1 LOAD H V open Vopen 1500 1650 1800 Vrms NO LOAD H V Load Vload 710 810 910 Vrms RL 120KΩ Start voltage Vst 1700 1850 2000 Vrms RL CCFL Protect delay time PDT 0 1 1 4 Sec ...

Page 10: ...A 1280 H x 1024 V screen format and 16 7M colors RGB 8 bits data All input signals are 2 Channel LVDS interface compatible This module does not contain an inverter card for backlight 4 4 2 DISPLAYS CHARACTERISTICS The following items are characteristics summary on the table under 25 condition 4 4 3 OPTICAL CHARACTERISTICS The optical characteristics are measured under stable conditions at 25 h t t...

Page 11: ...CFL inverter should be able to give out a power that has a generating capacity of over 1810 voltage Lamp units need 1810 voltage minimum for ignition Note 4 CCFL operation voltage is measured at 25 2 Note 5 The variance of CCFL power consumption is 10 Calculator value for reference ICFL VCFL 4 PCFL Note 6 Definition of life brightness becomes 50 or less than the minimum luminance value of CCFL The...

Page 12: ...Lenovo LXM L19BH Page 12 of 44 5 BLOCK DIAGRAM 5 1 SOFTWARE FLOW CHART h t t p w w w w j e l n e t ...

Page 13: ...Lenovo LXM L19BH Page 13 of 44 h t t p w w w w j e l n e t ...

Page 14: ...BLOCK DIAGRAM LCD Interface LVDS CN403 Scalar GM2321 PQFP 208 Include MCU ADC OSD U401 OSD Control Interface Keypad CN402 EEPROM U402 D Sub Connector CN301 EEPROM U302 EPR_SDA EPR_SCL RXD TXD RGB DB15_SDA DB15_SCL Crystal 14 31818 MHz X401 H Sync V Sync h t t p w w w w j e l n e t ...

Page 15: ...Lenovo LXM L19BH Page 15 of 44 5 2 2 INVERTER POWER BOARD BLOCK DIAGRAM Inverter Block Diagram h t t p w w w w j e l n e t ...

Page 16: ...Lenovo LXM L19BH Page 16 of 44 Power Block Diagram h t t p w w w w j e l n e t ...

Page 17: ...RX0 RX1 RXC RX1 RX0 RED GREEN RED GREEN BLUE BLUE RX2 HSYNC VSYNC DDC_SDA_VGA DDC_SCL_VGA SOG_MCSS HOST_SCL UART_DI HOST_SDA UART_DO DDC_WP VGA_PLUG RX1 IR_IN HSYNC DDC_SCL_VGA LBADC_IN2 LV_O 0 9 GREEN RX0 HOST_SDA UART_DO VBI_INTR SHEET 4 4 GM5221 RX0 RX2 RX1 RX1 BLUE RXC RXC RX0 RX2 GREEN RED RED BLUE GREEN DDC_SCL_DVI DDC_SDA_DVI DDC_SDA_VGA VSYNC PBIAS DDC_SCL_VGA HSYNC PPWR LV_E 0 9 LV_O 0 9 ...

Page 18: ... GND D302 BAT54C GS08 3 1 2 D308 MLL5232B 5 6V R309 4 7K 1 16W RED 4 A GREEN D307 BAV99 3 1 2 R327 84 5 1 16W 1 R333 10K 1 16W HSYNC 4 DVISCL R336 100K 1 16W U301 M24C02WMN6 4 8 1 2 3 7 6 5 GND VCC A0 A1 A2 WP SCL SDA GND GND U303 74LVC14ADT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1A 1Y 2A 2Y 3A 3Y GND 4Y 4A 5Y 5A 6Y 6A VCC VGA_5V R312 100 1 16W GND GREEN 4 ED303 NC 1 2 R318 47 1 16W 1 ED306 NC 1 2 HSYNC...

Page 19: ...190 205 166 9 41 75 96 116 67 68 12 121 25 126 28 115 171 26 172 24 137 11 164 181 182 8 42 51 74 76 94 97 140 180 163 165 136 155 48 47 87 86 66 65 33 34 62 59 61 60 58 57 63 64 46 45 44 43 38 37 55 56 32 31 30 29 22 21 49 54 18 17 16 15 14 13 19 20 167 70 135 27 40 113 120 125 130 134 141 145 7 6 95 184 183 191 206 139 179 177 39 168 156 131 127 146 81 82 83 84 85 88 89 90 91 138 10 102 103 106 ...

Page 20: ...FID GPIO HS CS GPIO VS VBLK GPIO XTAL1 XTAL2 PLL_A18VDD PLL_A18GND CH1_A18VDD CH1_A18GND VI_1A CH2_A18VDD R506 NC YOUT2 TP505 C528 47uF 16V MSTR_SDA YUV 0 7 4 3V3_D R504 10K 1 16W S Video CVBS_IN C515 0 1uF 1V8_A GPIO9 SCL 4 7 PVVS R502 75 1 16W C513 47uF 16V 3V3_D L502 120 OHM GND GND C521 0 1uF Connect two grounds at single point C506 0 001uF TP501 YOUT7 R514 NC 3V3_A GND Chroma GND C505 330pF H...

Page 21: ...s at single point C606 0 47uF 16V C602 470uF 16V C612 100pF PWM1 GPIO12 VOLUME CN601 PHONEJACK 1 5 2 4 3 R606 1K 1 16W AUDIO_STBY_MUTE PWM2 GPIO13 4 R604 10K 1 16W C601 470uF 16V GND C603 0 1uF 12V GND U601 TDA7496L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GND GND GND INL VAROUT_L VOLUME VAROUT_R NC INR SVR STBY MUTE GND OUTR VS VS OUTL GND GND GND R607 1K 1 16W C604 0 47uF 16V C605 470u...

Page 22: ...ADC_RET C458 NC C455 0 1uF TX1 O TXCK E TXCK O R449 0 1 16W TX0 E GPIO0 LBADC_IN2 4 TX3 O 5mm LV_O3 TX2 O R453 0 1 16W C450 NC TXCK O LV_E0 LBADC_IN1 R444 NC TX3 O R450 100K 1 16W TX1 E When using 12V U701 should be SI9953ADY LV_E 0 9 TX2 O C452 100uF R446 10K 1 16W R447 NC 5V R440 1K 1 16W TX3 E LV_O4 TX1 O LV_E8 LV_O6 LBADC_IN1 GND R441 330 1 16W LV_E4 TX0 O LV_O8 C456 0 1uF 5V LV_O9 GPIO0 LED_G...

Page 23: ... CONN 2 4 6 8 10 12 1 3 5 7 9 11 DIM GND D802 GS1D U801 AIC1084 33M 3 1 2 VIN ADJ VOUT PWM0 GPIO11 DIM C814 0 1uF C811 0 1uF R804 2K 1 16W GND Q802 PMBS3904 3 2 1 PBIAS 4 GND C809 47uF 16V GND C804 0 1uF GND VCC12V R806 1K 1 16W GND GND Q803 PMBS3904 3 2 1 C810 0 1uF C806 47uF 16V C813 47uF 16V GND GND Q801 PMBS3904 3 2 1 GND R805 1K 1 16W FB801 600 OHM 1 8V_DVDD VCC12V 3 3V_DVDD C812 47uF 16V C80...

Page 24: ...1 Q205 PMBS3904 3 2 1 Q203 AO4411 1 2 3 4 8 7 6 5 S1 S1 S1 G1 D1 D1 D1 D1 TP1 HVL 1 R231 2K 1 4W C220 1uF 25V R238 12K 1 16W R216 220 1 16W C209 1uF 25V CN203 33L8020 2D 33L8021 2D LAYOUT 1 2 is power GND R223 15K 1 16W TP3 HVL 1 C230 OPEN C217 22pF 3KV R235 620 1 16W Q212 2SC5706 C212 1uF 25V D207 1N4148 C208 330pF R203 5 1K 1 16W C223 150uF 25V R210 15K 1 16W Q206 PMBS3904 3 2 1 C225 OPEN R206 4...

Page 25: ...Lenovo LXM L19BH Page 25 of 44 7 PCB LAYOUT 7 1 MAIN BOARD h t t p w w w w j e l n e t ...

Page 26: ...Lenovo LXM L19BH Page 26 of 44 7 2 Power Inverter Board h t t p w w w w j e l n e t ...

Page 27: ...AINTAINABILITY 8 1 EQUIPMENT AND TOOLS REQUIREMENT 1 Voltmeter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with a IBM Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Service Manual 8 User Manual h t t p w w w w j e l n e t ...

Page 28: ...cable again Check LED status Replace U401 Show noting Connected the Signal cable again Check Power switch is in Power on status and check if Power switch had been stuck Led Orange OK Keyboard no stuck Led orange Led Green Check the Wire Harness from CN503 Measured RGB R318 R319 R320 H V Input at U401 pin 181 182 does there have signal Check digital signal from CN301 Check Correspondent component s...

Page 29: ...Replace Power board Re do white balance On Off control 5V on DIM signal control 0V 5V Replace U201 OK Check C454 should have response from 0V to 5V When we switch the power switch from off to on Measured X401 waveform is normal Measured power supply for U401 OK Check U701 Q403 is broken or CN403 solder abnormal Replace U701 Q403 or re solder CN403 OK NG Replace U401 Replace X401 Check power supply...

Page 30: ...01 14 318MHz Check HS VS input signal are normal OK Replace U401 OK OK Check relative component NG NG Check relative circuit to panel OSD is unstable or not working Is Keypad Board connecting normally Connect Keypad Is Button Switch normally Replace Button Switch Y N N Is Keypad Board Normally Replace Keypad Board Y N Y Check Main Board h t t p w w w w j e l n e t ...

Page 31: ...e volt 120V or 220V NG Change F901 check BD901 Q903 and IC901 Check the voltage of C905 Check R906 R907 IC901 Check start voltage for the pin3 of IC901 NG Check the auxiliary voltage is smaller than 20V 1 Check IC902 IC903 ZD901 2 Check Q901 Q902 OVP circuit OK OK OK NG NG Check D910 D912 IC902 IC903 NG h t t p w w w w j e l n e t ...

Page 32: ...U201 pin9 12V NG OK Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave NG OK Change U201 Check D201 have the output of square wave at short time NG OK Check Q203 Q209 Q210 D201 Check the resonant wave of pin2 pin5 for PT201 NG Check the output of PT201 Check Q209 Q210 C213 Check connecter lamp OK NG Change PT201 OK h t t p w w w w j e l n e t ...

Page 33: ...y window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color1 on factory window until chroma 7120 indicator reached the value G 100 6 Adjust the BLUE of color1 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 2 B Adjust 6500K color temperature 1 Switch the chroma ...

Page 34: ...3 68 26 1E 78 2A 6D 65 A2 5A 4C 9D 23 32 13 4F 54 AF EF 00 81 80 01 01 01 01 01 01 01 01 48 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 64 36 00 78 2D 11 00 00 18 00 00 00 FF 00 31 34 35 80 36 37 38 39 30 31 32 33 34 35 00 00 00 FD 00 37 96 4B 1E 53 0E 00 0A 20 20 20 20 20 20 00 00 00 FC 112 00 4C 58 4D 2D 4C 31 39 42 48 0A 20 20 20 00 72 h t t p w w w w j e l n e t ...

Page 35: ... EPS L 1 PCS 44G3924 2 EPS R 1 PCS 44G3924608 1A CARTON 1 PCS 45G 76 28 RN PE BAG FO MANUAL BASE 1 PCS 45G 88606 PE BAG FOR BASE 1 PCS 45G 88609 C EPE COVER 1 PCS 45G 88626 1 PE BAG FOR MONITOR 1 PCS 50G 600 2 HANDLE1 1 PCS 50G 600 3 HANDLE2 1 PCS 52G 1185 6B LENOVO MIDDLE TAPE 12 CM 52G 1186 SMALL TAPE 8 CM 52G6020 5 PROTECT FILM 1 PCS 52G6025 11699 INSULATE SHEET 1 PCS 85G 676 1 SHIELD CONN DOOR...

Page 36: ...0 25V MATSUSH 1 PCS C806 67L309V470 3 47UF 16V 85C 1 PCS C807 67L309V470 3 47UF 16V 85C 1 PCS C809 67L309V470 3 47UF 16V 85C 1 PCS C812 67L309V470 3 47UF 16V 85C 1 PCS C813 67L309V470 3 47UF 16V 85C 1 PCS CN301 88G 35315FHSW GP D SUB 1 PCS CN402 33G8019 8C FPC FFC CONN 1 PCS CN403 33G801724E H WAFER 1 PCS CN801 33G8022 12 H PIN HEADER FEMALE 2 6 9 1 PCS X401 93G 22 53 J 14 31818MHZ 32PF 49US 1 PCS...

Page 37: ... X7R 1 PCS C420 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C422 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C423 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C424 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C425 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C426 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C428 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C429 65G0603104 32 CHIP 0 1UF 50V X7R 1 PCS C430 65G0603104 32 CHIP 0 1UF 50V X7R...

Page 38: ... 60230 BAT54C L43 1 PCS D303 93G 39147 TZMC5V6 1 PCS D304 93G 39147 TZMC5V6 1 PCS D305 93G 6433P BAV99 1 PCS D306 93G 6433P BAV99 1 PCS D307 93G 6433P BAV99 1 PCS D310 93G 39147 TZMC5V6 1 PCS D311 93G 39147 TZMC5V6 1 PCS D312 93G 39147 TZMC5V6 1 PCS D313 93G 39147 TZMC5V6 1 PCS D801 93G1004 3 SS14 1 PCS D802 93G1020 1 S GS1D 1 PCS D803 93G1020 1 S GS1D 1 PCS FB301 71G 59C300 CHIP BEAD 1 PCS FB302 ...

Page 39: ...T SM 0603 RC0603 100R 1 PCS R316 61L0603200 CHIP 20OHM 1 10W 1 PCS R317 61L0603200 CHIP 20OHM 1 10W 1 PCS R318 61L0603470 9F CHIP 47OHM 1 10W 1 1 PCS R319 61L0603470 9F CHIP 47OHM 1 10W 1 1 PCS R320 61L0603470 9F CHIP 47OHM 1 10W 1 1 PCS R321 61L0603750 9F 75OHM 1 1 10W 1 PCS R322 61L0603750 9F 75OHM 1 1 10W 1 PCS R323 61L0603750 9F 75OHM 1 1 10W 1 PCS R324 61L0603845 9F CHIP 84 5OHM 1 16W 1 1 PCS...

Page 40: ...CS R450 61L0603104 RST SM 0603 RC0603 100K 1 PCS R451 61L0603104 RST SM 0603 RC0603 100K 1 PCS R452 61L0603472 RST SM 0603 RC0603 4K7 1 PCS R453 61L0603000 RST SM 0603 JUMP MAX 0R 1 PCS R801 61L0603202 CHIPR 2K OHM 5 1 10W 1 PCS R802 61L0603103 RST SM 0603 RC0603 10K 1 PCS R803 61L0603103 RST SM 0603 RC0603 10K 1 PCS R804 61L0603202 CHIPR 2K OHM 5 1 10W 1 PCS R805 61L0603102 RST SM 0603 RC0603 1K ...

Page 41: ...210 0236 1 PCS CON203 33G8021 2D AC CONN 2P R A 87210 0236 1 PCS CON204 33G8021 2D AC CONN 2P R A 87210 0236 1 PCS L101 71G 55 28 FERRITE BEAD 7 62 5 08 1 PCS L102 73G 253138 Y CHOKE BY 1 PCS L201 73G 253138 Y CHOKE BY 1 PCS L202 73G 253138 Y CHOKE BY 1 PCS L203 73G 174 30YSA FILTER 1 PCS L204 73G 174 30YSA FILTER 1 PCS PT201 80LL15T 7YSG X FMR 1 PCS PT202 80LL15T 7YSG X FMR 1 PCS Q209 57G 761 6 2...

Page 42: ...2V LL4148 GS08 1 PCS D207 93G 6432V LL4148 GS08 1 PCS D208 93G 6432V LL4148 GS08 1 PCS D209 93G 6432V LL4148 GS08 1 PCS D210 93G 6432V LL4148 GS08 1 PCS F201 61L1206000 4 0 OHM 4A 1 4W 1 PCS Q201 57G 760 5B PDTC144WK SOT346 1 PCS Q202 57G 760 4B PDTA144WK SOT346 1 PCS Q203 57G 763 3 AO4411 SO 8 1 PCS Q204 57G 763 3 AO4411 SO 8 1 PCS Q205 57G 417 4 PMBS3904 PHILIPS SMT 04 1 PCS Q206 57G 417 4 PMBS3...

Page 43: ...1L0603621 CHIPR 620 OHM 5 1 10W 1 PCS R235 61L0603621 CHIPR 620 OHM 5 1 10W 1 PCS R236 61L0603511 CHIPR 510 OHM 5 1 10W 1 PCS R237 61L0603511 CHIPR 510 OHM 5 1 10W 1 PCS R238 61L0603123 CHIP 12K OHM 1 10W 1 PCS R239 61L0603123 CHIP 12K OHM 1 10W 1 PCS R240 61L0603513 CHIP 51K OHM 1 10W 1 PCS R241 61L0603513 CHIP 51K OHM 1 10W 1 PCS U101 56L 563 11 SI 8050SD 1 PCS U201 56L 379 35 FP5451DR 1 PCS 715...

Page 44: ...PR 1 5KOHM 5 1 10W 1 PCS R4 61L0603102 RST SM 0603 RC0603 1K P 1 PCS R5 61L0603102 RST SM 0603 RC0603 1K P 1 PCS R7 61L0603302 CHIPR 3K OHM 5 1 10W 1 PCS SW101 77L 604 2 TO TACT SW BY TOUKE TS 9 T 1 PCS SW102 77L 604 2 TO TACT SW BY TOUKE TS 9 T 1 PCS SW103 77L 604 2 TO TACT SW BY TOUKE TS 9 T 1 PCS SW104 77L 604 2 TO TACT SW BY TOUKE TS 9 T 1 PCS SW105 77L 604 2 TO TACT SW BY TOUKE TS 9 T 1 PCS 1...

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