Haier HL42B-B Service Manual Download Page 7

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3. LOCATION OF CONTROLS AND COMPONENTS

3.1.Board Location

No. Parts

number

Description

A Board Power Board
B Board Main Board

3.2. Main Board

3.2.1 Function Description:

Mian Board

：

Process signal which incept from exterior equipment

，

then translate into signal that panel

can display.

Signal flowing chart

Summary of Contents for HL42B-B

Page 2: ... LOCATION OF CONTROLS AND COMPONENTS 7 3 1 Board Location 7 3 2 Main Board 7 3 3 Power Board 11 3 5 LCD Panel 12 4 INSTALLATION INSTRUCTIONS 15 4 1 External Equipment Connections 15 4 2 HDMI Connections 19 5 OPERATION INSTRUCTIONS 21 5 1 Front Panel Controls 21 5 2 Back Panel Controls 22 5 3 Universal Remote Controller 22 6 DISASSEMBLY INSTRUCTIONS 24 6 1 Whole Machine 25 6 2 Base Subassembly 26 6...

Page 3: ... installation This equipment generates use and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference with not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determine...

Page 4: ... defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet To prevent electric shock ensu...

Page 5: ...ts and extension cord as this can result in a risk of fire or electric shock MAINTENANCE To remove dirt or dust wipe the cabinet with a soft dry lint free cloth Please be sure not to use a wet cloth Cleaning the Screen Early malfunctions can be prevented Careful and regular cleaning can extend the amount of time you will have your new TV Be sure to turn the power off and unplug the power cord befo...

Page 6: ...7216 NO of preset channels 181 OSD language English Color system NTSC ATSC Audio system Audio output power Built in W 10W 2 Audio output power outer W YES Total power input W 240W Voltage range V AC150V AC240V Power frequency Hz 50 60Hz Time of sleep timer MINS 120Min Net weight KG 57 Gross weight KG 66 Net dimension MM 42 4 7 8 29 7 8 Packaged dimension MM ...

Page 7: ...Location No Parts number Description A Board Power Board B Board Main Board 3 2 Main Board 3 2 1 Function Description Mian Board Process signal which incept from exterior equipment then translate into signal that panel can display Signal flowing chart ...

Page 8: ...8 3 2 2 Connector definition Main board connector ...

Page 9: ...ply the Power of bright and IR receiver 2 IR Receive IR signal 3 G Show green when TV standby 4 B Show blue when TV working 5 GND Ground 6 NC NC Pin number Signal name Description 1 GND Ground 2 AD0 Control Power CH CH 3 AD1 Control Menu V V INPUT Pin number Signal name Description 1 BKANJ Control the backlight of pannel 2 BKEN The system turn on or turn off the backlight of TFT LCD Panel through ...

Page 10: ... LVDS VDD 11 Not use 19 A2P 4 LVDS VDD 12 Not use 20 A2N 5 Not use 13 A0P 21 GND 6 Not use 14 A0N 22 GND 7 GND 15 GND 23 CK1P 8 GND 16 LVDS_SEL 24 CK1N Pin number Signal name 25 A3P 26 A3N 27 GND 28 GND 29 Not use 30 Not use Pin number Signal name Description 1 18V Power of Audio power amp 2 18V Power of Audio power amp 3 GND Ground 4 GND Ground Pin number Signal name 1 L 2 L 3 R 4 R ...

Page 11: ...ower board Pin number Signal name 1 AVR 2 GND 3 AVL 4 GND 5 Video Pin number Signal name Description 1 HPOUTL 2 HPDET The detect pin of headphone The pin is high when HP insert HP terminal or else It is low 3 HPOUTR Ground Pin number Signal name Description 1 3 3V Power the I2C 2 UORX Receiv signal from download tool 3 UOTX Send signal from download tool 4 GND Ground ...

Page 12: ...TOR CON4 3 5 LCD PANEL 3 5 1 Function Description Display the signal 3 5 2 Connector definition CON2 Signal name 1 24V 2 24V 3 24V 4 24V 5 24V 6 GND 7 GND 8 GND 9 GND 10 GND CON6 Signal name 1 2 16 5V 3 4 GND CON4 Signal name 1 ON OFF 2 GND 3 5VSB 4 GND 5 GND 6 12V 7 ...

Page 13: ...ve transmission data of pixel 2 13 GND Ground 14 RXCLK Negative of clock 15 RXCLK Positive of clock 16 GND Ground 17 RX3 Negative transmission data of pixel 3 18 RX3 Positive transmission data of pixel 3 19 GND Ground 20 NC No Connection 21 HND Select LVDS data format 2 22 HND No Connection 3 23 HND Ground 24 HND Ground 25 HND Ground 26 VCC Power Supply 5V 27 VCC Power Supply 5V 28 VCC Power Suppl...

Page 14: ...BL ON OFF 13 I_PWM Internal PWM Control 14 E_PWM External PWM Control Notice PIN 13 Analog Dimming Control Use Pin 13 0v 3 3v and Pin 14 must open PIN 14 PWM Dimming Control Use Pin 14 Pin 13 must open PIN 13 I_PWM and Pin 14 E_PWM can not open in same period ...

Page 15: ...ve the picture quality in a poor signal area please purchase a signal amplifier and install properly If the antenna needs to be split for two TV s install a 2 Way Signal Splitter in the connections If the antenna is not installed properly contact your dealer for assistance Choose Your Connection There are several ways to connect your television depending on the components you want to connect and t...

Page 16: ...ipment Connections External A V Source Setup How to connect Connect the audio and video cables from the external equipment s output jacks to the TV input jacks as shown in the figure When connecting the TV to external equipment match the jack colors Video yellow Audio Left white and Audio Right red How to use 1 Select the input source with using the INPUT button on the remote control 2 Press the b...

Page 17: ...80i How to connect Use the TV s Y PB PR VGA or HDMI jack for video connections depending on your set top box connector Then make the corresponding audio connections How to use 1 Turn on the digital set top box Refer to the owner s manual for the digital set top box 2 Use INPUT on the remote control to select YPbPr VGA or HDMI source Digital Set top Box Digital Audio Output Send the TV s audio to e...

Page 18: ...as required How to use 1 Turn on the PC and the TV 2 Turn on the display by pressing the POWER button on the TV s remote control 3 Use INPUT on the remote control to select VGA or HDMI source 4 Check the image on your TV There may be noise associated with the resolution vertical pattern contrast or brightness in PC mode If noise is present change the PC mode to another resolution change the refres...

Page 19: ...e device DVD player or Set Top Box supports DVI How To Connect 1 Connect the source device to HDMI port of this TV with a HDMI to DVI cable not supplied with this product 2 A separated audio connection is necessary 3 If the source device has an analog audio output connector connect the source device audio output to DVI Audio In port located on the left side of HDMI port How To Use If the source de...

Page 20: ...let NOTES Never connect the AC line cord plug to other than the specified voltage Use the attached power cord only If the polarized AC cord does not fit into a non polarized AC outlet do not attempt to file or cut the blade It is the user s responsibility to have an electrician replace the obsolete outlet If you cause a static discharge when touching the unit and the unit fails to function simply ...

Page 21: ...U 1 INPUT 2 3 4 5 Introduction 6 TV LCD TFT MENU CH VOL Controls HL37B HL42B HL37BG HL40BG HL42BG CH VOL POWER POWER CH VOL HL37S VIDEO AV3 AUDIO Input connect to hear stereo sound from an external device AV3 VIDEO Input Connects the video signal from a video device Earphone jack Earphone audio output terminal AUDIO R AUDIO L 1 INPUT Press to show the input source mode In the MENU INPUT screen the...

Page 22: ...vice RS 232 INPUT HDMI INPUT For service S Video Input DVD DTV Input CONTROL SERVICE PORT connect the monitor Connect S Video out Component Connect to the RS 232 port on signal to HDMI DVI from an S VIDEO Connect a component a PC device to the S video video device to these jacks input 5 3 Setting Up Your Remote Control After it has been set up properly your remote control can operate in six differ...

Page 23: ... Press to change the channel EXIT Clears all on screen displays and returns toTV viewing from any menu INPUT show the input source mode MUTE Switches the sound on or off CC closed caption Select a closed caption CC MUTE CC ON CC OFF GUIDE Shows program schedule INFO When you watch the TV press the key the information displays on bottom of the screen MENU Brings up the main menu to the screen PRE D...

Page 24: ...Mode the remote controller will be no reaction to other buttons pressed and will automatically exit the mode if no any key is pressed within 10 seconds 6 DISASSEMBLY INSTRUCTIONS 1 Remove the Pedestal Lay down the unit so that rear cover faces upward Remove the four screw from the rear cover indicated with Then remove the pedestal 2 Remove the Back Cover Remove the twelve screws indicated on figur...

Page 25: ...pler CN28 CN2 CN26 CN22 CN23 CN20 CN21 Remove the Main board 6 1 whole machine The whole machine includes Packaging subassembly Front frame subassembly Back cover subassembly Screen bracket subassembly Base subassembly LCD panel Power assembly PSU Wire subassembly 8 Remove the speaker Remove the eight screws take out the speaker 9 Remove the remote control board Remove the two screws take out the ...

Page 26: ...machine 2 Packaging 3 TV Set 3 1 Base subassembly 3 2 Back cover subassembly 3 3 Screen bracket module 3 3 1 Screen bracket assembly 3 3 2 Main Board 3 3 3 PSU JSK4260 050 3 4 LCD PANEL LC402WX7 SLA1 3 5 Front frame subassembly 4 accessory 5 carton 6 2 Base subassembly ...

Page 27: ...ion Parts number 1 Base subassembly 2 Base assembly 2 1 Base cover 2 2 Iron soleplate 2 3 Base support Board 2 4 Rubber PAD 3 Bolt GB818 85 M4 8 4 Bolt SJ2824 87 ST3 10F 5 Bolt GB9074 4 88 M4 12 6 3 Back cover subassembly ...

Page 28: ...2 2 2 3 2 4 2 5 2 1 Back cover 2 2 Back cover label cover label 2 3 Side av label 2 4 Back jack label SJ2824 87 ST4 8F 2 5 Screw GB818 85 M3 6 6 4 Screen bracket subassembly Components List NO Name Description Parts number 1 Screen bracket subassembly 2 Screen bracket assembly Include 2 1 2 2 2 3 ...

Page 29: ...frame subassembly Components List NO Name Description Parts number 1 Front frame module 2 Front frame assembly 2 1 Front frame 2 2 Speaker Cover 2 3 Decorate ring 2 4 Power hole stopper 2 5 Key board trestle 3 Screw SJ2824 87 ST3X12F 4 Screw SJ2824 87 ST3 10F 5 Screw SJ2825 87 ST3 10F ...

Page 30: ...ire Photo 6 6 2 Components List NO Name Description Parts number 1 Power input connect wire 2139 5P 500mm 2 24v power wire TJC3 3P 450mm TJC3 15P 3 LVDS wire 4 12V Power wire 5 Remote control wire PH7 350MM PH15 700MM PH 6 Key wire PH 3 800mm PH 3 7 Speaker wire ...

Page 31: ...MENTS The way to the factory mode menu 1st press menu 2en input 8893 3rd press ok Finished these operations system will be into the factory mode menu 1 Factory menu 2 Version info Version info This is the current software version ...

Page 32: ...32 2 Video It include Auto Color and Color Temperature ...

Page 33: ...33 3 Audio It include these functions 4 Channel Dolby Banner On Off Compression Line RF Compression Factor Full Off 7 8 3 4 5 8 1 2 3 8 1 4 1 8 Downmix Off Lt Rt Stereo ...

Page 34: ...34 Channel menu includes 5 Function Range Scan Single RF Scan Factory Scan ...

Page 35: ...35 Function ment includes 8 BLOCK DIAGRAM AND CIRCUIT DIAGRAM 8 1 BLOCK DIAGRAM 8 2 CIRCUIT DIAGRAM Burning Mode On off Clean Storage ...

Page 36: ... YPBPR2R_IN 10 5VSB 1 2 7 12 14 15 HPDET 5 14 DV33 12V 5VSB 5V CE114 100uF 16v R412 33 CN31 PHONE JACK 1 2 3 4 5 C299 22pF CE82 10uF 16V R407 33k CE120 47uF 16V CAP6 5MM CE77 10uF 16V L74 FB R403 33k D68 MVS0603E10 1 2 CN19 EJTAG3 3pin 2 0mm 1 2 3 1 2 3 R234 10K SMD R0603 CE73 10uF 16V CE85 10uF 16V CE86 10uF 16V R423 10K C937 0 1uF SMD CC0603 C305 0 1uF SMD CC0603 R238 4 7k CE113 100uF 16v R237 3...

Page 37: ...A2N 5 OPWM1 5 5V 1 2 7 11 12 13 15 OPCTRL5 5 OPCTRL4 5 5VSB 1 2 5V_LVDS 16 DV33 1 2 5 6 7 13 AV33 2 5 6 11 12 GPIO_15 5 GPIO_14 5 SIF_SDA 4 7 13 SIF_SCL 4 7 13 12V 12V 5V_LVDS 5V LVDSVDD 5V 5VSB 5V AV33 TP56 DIMMING TP SMD D1 0 TP50 TP51 Q29 2N3904 SOT23 1 2 3 D47 CEM9435A SOIC8 SMD 5 1 2 3 4 6 7 8 D S S S G D D D Q27 2N3904 SOT23 1 2 3 C331 0 1uF SMD CC0603 R300 NS 0 SMD R0603 R306 10K SMD R0603 ...

Page 38: ... 7K C320 0 01uF R277 4 7K_DNS C314 0 1uF R280 39K CE103 47uF 16V 1 2 R274 4 7K R271 470 1 2 D46 1N4148 C317 1500P C326 1uF Q37 MMBT3904 1 2 3 C319 0 1uF TP48 CE94 0 47uF 50V CE97 0 1uF 50V D45 1N4148 R279 470 1 2 HTQFP48 U29 TPA3101 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17 18 19 20 21 24 25 26 27 28 29 30 31 36 33 34 35 32 37 38 39 40 41 42 43 44 45 46 47 48 15 23 22 49 50 51 52 53 54 55 56 57 58 59...

Page 39: ...F C343 0 1uF R312 1K C341 10nF U30 FDS9435A 1 2 3 4 8 7 5 6 S1 S2 S3 G D1 D2 D4 D3 R319 10K Q30 MMBT3904 1 2 3 U32 AP1506 3 0 ADJ 1 5 4 3 2 6 VIN ON FBK GND Vout TAB R314 1K L12 47uH C336 0 1uF R317 3K C340 0 1uF C342 0 1uF C338 0 1uF R315 10K C344 0 1uF CE118 470uF 16V CAP8 5MM U31 AP1506 3 0 ADJ 1 5 4 3 2 6 VIN ON FBK GND Vout TAB R318 1K L11 47uH D49 SK34DI 1 2 R313 10K R320 NS 0 SMD R1210 C335...

Page 40: ...5VSB 1 2 7 13 14 15 GPIO_2 PWR5V GPIO_5 5 GPIO_17 5 DV33SB 1 2 5 6 7 11 5VSB AV33 5VSB 5VSB 5V 5V 5V 5V 5V 5VSB DV33SB D37 BAV70 1 2 3 C285 100nF D33 BAV70 1 2 3 C292 100nF U27 TMDS341A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 7...

Page 41: ...N13 phonejack 1 2 3 4 5 6 7 GND GND NS NS R L R R180 100 SMD R0603 C275 10nF SMD CC0603 R187 100 SMD R0603 D22 EZJZ0V800AA SMD R0603 1 2 R194 68 SMD R0603 C278 100nF SMD CC0603 D20 NS EZJZ0V800AA SMD R0603 1 2 R192 100 SMD R0603 C273 10nF SMD CC0603 TP42 R189 75 SMD R0603 FB54 FB 80OHM SMD L0603 C263 NS 10nF SMD CC0603 C264 10nF SMD CC0603 C272 10nF SMD CC0603 D21 EZJZ0V800AA SMD R0603 1 2 D25 NS ...

Page 42: ...0_Ohm_600mA 1 2 D11 BAV99 3 1 2 R130 75 R0603 SMD R125 10K R0603 SMD C230 47pF SMD CC0603 R129 100 R0603 SMD C219 47nF SMD CC0603 D10 BAV99 3 1 2 D9 EZJZ0V800AA SMD R0603 1 2 CN6 AV3 1 2 3 4 5 FB41150_Ohm_600mA 1 2 FB40150_Ohm_600mA 1 2 FB39150_Ohm_600mA 1 2 C229 47nF SMD CC0603 C220 47pF SMD CC0603 C224 47pF SMD CC0603 CN8 AV 2 3 4 5 6 1 7 8 9 10 11 12 13 14 R136 10K R0603 SMD C226 10nF SMD CC060...

Page 43: ...0 1uF SMD CC0603 R121 22 R0603 SMD CE55 4 7uF 16V CE58 100uF 16v CAP6 5MM U22 IC LP2996 DDR Termination SOP 8 SOP8 SMD 1 2 3 4 5 6 7 8 GND SD VSENSE VREF VDDQ AVIN PVIN VTT RN28 47x4 RN0603 SMD 1 2 3 4 5 6 7 8 R107 22 R0603 SMD C171 0 1uF SMD CC0603 RN10 47x4 RN0603 SMD 1 2 3 4 5 6 7 8 C204 0 1uF R115 75 R0603 SMD C214 0 1uF C206 0 1uF CE57 4 7uF 16V C187 0 1uF SMD CC0603 RN9 75x4 RN0603 SMD 1 2 3...

Page 44: ...AP6 5MM CE53 10uF 16V CAP6 5MM R74 100 SMD R0603 R95 0 8 2K SMD R0603 FB35 FB SMD L0603 R87 4 7K SMD R0603 R76 4 7K SMD R0603 R72 100 SMD R0603 FB63 FB SMD L0603 R71 33 SMD R0603 CN30 TOTX141_DNS 1 2 3 4 5 GND VCC IN PIN3 5 Y2 VCXO M3V 6P 27MHz OSC 6P SMD 7X5 1 2 3 4 5 6 CVIN TRI STATE GND OUT NC VDD CE121 10uF 16V CAP6 5MM C152 47pF SMD CC0603 C345 0 1uF 1 2 C153 NS 10nF SMD CC0603 FB36 FB SMD L0...

Page 45: ...NS 10K SMD R0603 D17 EZJZ0V800AA SMD R0603 1 2 C261 0 1uF SMD CC0603 R162 75 SMD R0603 C246 15pF SMD CC0603 FB43 FB 80OHM SMD L0603 CE63 10uF 25v C238 NS 10nF SMD CC0603 C248 NS 10nF SMD CC0603 C352 1uF SMD CC0603 R167 68 SMD R0603 Q9 BAV99 3 1 2 R155 NS 0 SMD R0603 C255 NS 10nF SMD CC0603 R139 68 SMD R0603 FB50 FB 80OHM SMD L0603 C258 15pF SMD CC0603 FB51 FB 80OHM SMD L0603 R140 68 SMD R0603 FB44...

Page 46: ...M_VREF 8 RVREF 5 AV12 AV33 AV12 AV12 DV33SB DV33SB DV33SB DV33 DV26_DDR DV12 DV26_DDR AV33 AV33 AV12 AV33 AV33 AV15 AV33 DV33SB AV15 FB27 FB SMD L0603 TP39 C90 0 1uF SMD CC0603 C114 0 1uF SMD CC0603 R60 NS 50 SMD R0603 C134 0 1uF SMD CC0603 C136 0 1uF SMD CC0603 C148 0 1uF SMD CC0603 C117 0 1uF SMD CC0603 C97 0 1uF SMD CC0603 C118 0 1uF SMD CC0603 C115 0 1uF SMD CC0603 C143 0 1uF SMD CC0603 C93 0 ...

Page 47: ...C7 D7 A8 B8 C8 D8 A9 B9 C9 D9 A10 B10 C10 D10 A11 B11 C11 D11 A12 F1 F2 F3 F4 G1 G2 G3 G4 H1 H2 H3 H4 J1 J2 J3 J4 K1 K2 K3 K4 L1 L2 L3 L4 M1 M2 M3 M4 N1 N2 N3 N4 P1 P2 P3 P4 R1 R2 R3 R4 T1 T2 T3 T4 U1 U2 U3 U4 V1 V2 V3 V4 W1 W2 W3 W4 Y1 Y2 Y3 Y4 AA1 AA2 AA3 AA4 AB1 AB2 AB3 AB4 AC1 B12 C12 D12 A13 B13 C13 D13 A14 B14 C14 D14 A15 B15 C15 D15 A16 B16 C16 D16 D23 A17 B17 C17 D17 A18 B18 C18 D18 A19 B1...

Page 48: ...0603 FB20 FB SMD L0603 MT5112AD BD TQFP 100 U14 MT5112AD_BD TQFP100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 NC NC AVDD2 NC NC NC AVSS9 NC NC AVDD9 A...

Page 49: ...V_TUNER 30V_TUNER R46 100 SMD R0603 R322 1k SMD R0603 R39 0 SMD R0603 R37 100K SMD R0603 R47 560 SMD R0603 R53 0 SMD R0603 U10 SAMSUNGTUNER DTVS205CR201A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 RFAGC NC VT33 IF IF IFAGC TP SCL SDA GND B5V AOUT AFT NC VOUT GND GND GND GND GND GND R44 NS 4 7K SMD R0603 C44 100nF SMD CC0603 CE36 10uF 16v CAP6 5MM R38 0 SMD R0603 CE37 10uF 16v CAP6 5MM R...

Page 50: ...805 C29 0 1uF SMD CC0603 CE12 220uF 16v CAP6 5MM FB8 FB SMD L0805 FB9 FB SMD L0805 R35 3K_1 C17 NS 1500pf 1 2 R349 NS 0 SMD R1210 C13 NS 100nF SMD CC0603 CE10 100uF 16V CAP 5MM C38 0 1uF SMD CC0603 FB6 10uH SMD L0805 R30 180_1 SMD R0603 R18 1 2K_1 SMD R0603 C32 0 1uF SMD CC0603 C42 0 1uF C34 0 1uF SMD CC0603 C24 0 1uF SMD CC0603 R20 2K_1 SMD R0603 C25 0 1uF SMD CC0603 C43 0 1uF CE5 4 7uF 50V R34 1...

Page 51: ...onday March 12 2007 INDEX HAIER Confidential BING Title Size Document Number Rev Date Sheet of MediaTek Inc TEL 03 567 0766 FAX 03 578 7610 No 1 2 Innovation Rd 1 SBIP Hsin Chu City 300 Drawn 12V 5V 5VSB OPWRSB OIRI GPIO_58 GPIO_59 GPIO_70 GPIO_130 GPIO_131 GPIO_132 GPIO_133 GPIO_70 GPIO_130 GPIO_131 GPIO_132 GPIO_133 OPCTRL0 DV33SB DV33 GPIO_58 GPIO_59 OIRI IR_DVD OPWRSB ON OFF ON OFF IR_DVD ADIN...

Page 52: ...53 9 WIRING CONNECTION DIAGRAM 10 TROUBLE SHOOTING GUIDE 10 1 Simple check 10 1 1 LCD is not bright 10 1 2 No picture ...

Page 53: ...onnector CN4 P1 CN4 P13 CN5 P1 P2 P3 CN4 P2 P3 P4 P5 CN4 P12 CON4 P14 2 Check output voltage voltage Vblon 5V Vipwm connector CN4 P12 J28 P26 P30 CON4 P14 CN4 CN5 ON 2 0 5 0 V On Off Control Voltage OFF VBLON 0 0 8 V MAX 3 0 3 15 3 3 V Maximun duty ratio Internal PWM Control Voltage MIN VIPWM VSEL L 0 V Minimum duty ratio ...

Page 54: ...55 CN4 CN5 J28 10 1 3 No sound ...

Page 55: ... 1st pin of CN20 is 18V Is 45th of U29 low Change U29 N Y N Y Y N Change power board Y Is there output of 21st and 39th pins of u29 Change main board Change U29 N Y Change speaker IS there input of 2ed pin of U29 ...

Page 56: ...rt replace speaker Second check CN2 CN3 with oscillograph confirm wave output or not Connector CN2 CN3 10 2 PSU failure check State No power First check cables which connect with PSU then check as follows 1 Check PSU input voltage AC input voltage 120V connector CON1 P1 P5 2 Check PSU output voltage orderly voltage 5V Stand By ON 5 0V 24V 12V connector CON4 3 CON4 1 CON4 6 7 CON2 1 4 State No soun...

Page 57: ...CP Sunken TCP lead cracking ACF bonding short Awful environment and something electric enter into LCD Mis align between TCP and Panel Panel failure TCP failure Failure Mode Part Name Description Phenomena Failure cause Dot Defect Bright dot dark dot in panel Incoming Inspection Standard Polarizer Bubble Bladder in Polarizer Bladder between Polarizer and top glass Polarizer Scratch Polarizer Scratc...

Page 58: ...ck Screen B L normal only Black screen display Maybe caused by surge current and EDS FIIcker Crosstalk LCD Vcom imbalance Abnormal Color Only color abnormal Capacitance improper bring crosstalk inside LCD panel Circuit Abnormal Color Only color abnormal 1 Chip lose action 2 IC short or joint bad 3 Panel and VSC connect bad Failure Mode Part Name Description Phenomena Failure cause Mechanlcal Nolse...

Page 59: ...n Without backlight Operation abnormal or systemic noise B L shut down B L shutdown in sometime Short between lamp housing and wire Because consume power too much F M F M in B L white back Rotundity or wire like F M in B L unit Failure Mode Part Name Description Phenomena Failure cause Light leakage Brightness at bottom of LCM brighter than normal B L unit badness Uniformity B L brightness asymmet...

Page 60: ...61 Sincere Forever ...

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