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Service Manual

Model No.:

- 49 -

4) No sound

No sound

Check if there is sound input

signal

Reset

volume

Check the

input

source

Check if the volume control is

at 0 level or muted

Check the

speakers

Check if there is output at

CJ26

Check if there is +12V input at
PIN7of U19

Check if the power supply

system is damaged, short

circuit or mis-connected

Check if MUTE PIN of U19 is low

voltage

Check the volume control

circuit from R302

U19

Check if there is signal input at PIN1

& PIN9 of U19

Check the volume input

circuit from U8 to

U19

Replace U19

Содержание MSDV1636-O3

Страница 1: ...s not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death WARNING ...

Страница 2: ...4 2 Remove the Back Cover 15 4 3 Remove the Adhesive Tape 15 4 4 Remove the Power Module 16 4 5 Remove the Main Board 16 4 6 Remove the Speaker 17 4 7 Remove the Remote Control Board 17 5 Installation Instructions 18 5 1 External Equipment Connections 18 5 2 HDMI Connections 21 6 Operation Instructions 24 6 1 Front Panel Controls 6 2 Back Panel Controls 6 3 Universal Remote Control 24 24 25 7 Elec...

Страница 3: ...Service Manual Model No 02 9 Trouble shooting 46 9 1 Simple Check 46 9 2 Main Board Failure Check 9 3 Panel Failure 47 54 ...

Страница 4: ...erous to make any king of contact with any inside part of this product This symbol indicates that there are important operating and maintenance instructions in the literture accompanying the appliance 1 3 2 Be careful to the electrical shock to rain or excessive moisture This TV must not be exposed to dripping or splashing water 1 3 3 Electro static discharge ESD Some semiconductor solid state dev...

Страница 5: ...with which receivers covered by this service manual might be equipped 0 CAUTION 0 eiver 3 Do not spray chemicals on or near this receiver or any of its assemblies 4 Unless specified otherwise in this service manual clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner cotton tipped stick or comparable non abrasive applicator 10 by volume Acetone and 9...

Страница 6: ... semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following techniques should be used to help reduce the ncidence of component damage caused by static by static electric...

Страница 7: ...elow Note A note provides information that is not indispensable but may nevertheless be valuable to the reader such as tips and tricks Caution A caution is used when there is danger that the reader through incorrect manipulation may damage equipment loose data get an unexpected result or has to restart part of a procedure Warning A warning is used when there is danger of personal injury Reference ...

Страница 8: ... V Color Display 262 144K No of Preset Channels 400 OSD Language English Color System PAL SECAM Audio System DK BG I M L L Audio Output Power Built in W 3W 2 Audio Output Power outer W No Total Power Input W 36W Voltage Range V DC 12V 3A Power Frequency Hz 50 60Hz Net Weight KG 2 8 Gross Weight KG 4 Net Dimension MM 458 38 310 Packaged Dimension MM 458 145 350 ...

Страница 9: ...Service Manual Model No 3 Location of Controls and Components 3 1 Board Location No Description A Board Main Board B Board Power Board 3 2 Main Board A Board B Board LVDS 515C3206M09 514C1601M01 30444005301 ...

Страница 10: ...OFF 4 5V 5 POWER ON OFF 6 5VSTB 7 5V 8 5V 9 GND 10 GND 11 GND 12 12V Notes J2 Pin 3 Backlight on off The system can turn on or turn off the backlight of TFT LED Panel through the power supply unit path J2 Pin 5 System power on standby System board will use this pin to control system power J2 Pin 2 Control the luminance of backlight The system can generate the PWN signal to control the strength of ...

Страница 11: ... QXPEHU 6LJQDO QDPH HVFULSWLRQ B5 03 5 B 03 5 1 5 5 027 21752 1 1 9 32 5 25 5 027 1 Keypad andremote connector J28 8 9 0 STANDBY Speaker connectorJ26 Pin number Signal name Description 1 RSPK RSPK 2 RSPK RSPK 3 LSPK LSPK 4 LSPK LSPK ...

Страница 12: ...tion Supply power for Main board Panel Service Manual Model No 11 CN3 Pin number Signal name 1 12V 1 GND 2 12V 2 ADJ 3 GND 3 BK ON OFF 4 GND 4 5 POWER ON OFF 6 5VSTB 7 5V 8 5V 9 GND 10 GND 11 GND 12 12V CN1 Pin number Signal name 12V 13 NC ...

Страница 13: ...3 4 LED Panel 12 Service Manual Model No 316156WB111 CLAA156WB 11A ...

Страница 14: ... differential data input R0 R5 G0 odd pixels 10 VSS Ground Shield 11 Odd_Rin1 LVDS differential data input G1 G5 B0 B1 odd pixels 12 Odd_Rin1 LVDS differential data input G1 G5 B0 B1 odd pixels 13 VSS Ground Shield 14 Odd_Rin2 LVDS differential data input B2 B5 HS VS DE odd pixels 15 Odd_Rin2 LVDS differential data input B2 B5 HS VS DE odd pixels 16 VSS Ground Shield 17 Odd_ClkIN LVDS differential...

Страница 15: ... 30 NC No connection 31 VSSLED Ground LED 32 VSSLED Ground LED 33 VSSLED Ground LED 34 DIAG_LOOP Pin 1 34 must be connected together on the inverter board 35 PWM System PWM Signal Input 3 3V Swing 36 LED_EN LED enable pin 3 3V Input 37 NC NC 38 VDDLED 7 5V 21V LED power 39 VDDLED 7 5V 21V LED power 40 VDDLED 7 5V 21V LED power ...

Страница 16: ...ove the Pedestal 4 3 Remove the adhesive tape The location of the adhesive tape as follows Remove the adhesive tape indicated on the Remove the front frame on the 0 faces upward 4 2Remove the Back Cover 0 unit Service Manual Model No 15 ...

Страница 17: ... 0 4 5 Remove the power module Service Manual Model No 16 4 4 Remove the Main board take out the Power board ...

Страница 18: ...4 7 Remove the speaker Take out the speaker 4 8 Remove the remote control Remove the screw take out the remote control board Service Manual Model No 17 ...

Страница 19: ...axial cable not included to the ANT IN jack on the back of your TV DVD combo then connect the other end of the cable into the antenna or cable TV wall outlet To improve picture quality from an antenna in a poor signal area install a signal If you need to split the antenna signal to connect two TVs install a two way splitter Service Manual Model No 18 ...

Страница 20: ... R G B R W R W R It can be connected to the following appliances VCR multi disc player DVD camcorder video game or stereo system etc YPbPr can support these video formats 480i 576i 480p 576p 720p 1080i component video HDMI TO AUDIO OUTPUTS VIDEO EQUIPMENT with Composite output TO VIDEO OUTPUTS HDMI W R W R TO AUDIO INPUTS VIDEO EQUIPMENT TO VIDEO INPUTS USB PC AUDIO VGA RF HDMI1 AV L R AV OUTPUT A...

Страница 21: ...cord 3 Power on theTV switch to PCmode 4 Power on thePC This sequence isvery important USB PC AUDIO VGA RF HDMI1 AV L R AV OUTPUT PRESET MODE PC 1 2 3 4 5 6 7 720 400 640 480 800 600 800 600 800 600 1024 768 1024 768 70 60 56 60 72 60 70 31 47 31 47 35 156 37 88 48 08 48 36 56 48 RESOLUTION V Freq Hz H Freq KHz AV L R Y Pb Pr HDMI2 POWER ...

Страница 22: ... menu When the source 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 PC port How To Use If the sour...

Страница 23: ...Cable sample HDMI Cable not supplied with the product HDMI to DVI Cable not supplied with the product Analog Audio Cable Stereo to RCA type not supplied with the product Service Manual Model No 22 ...

Страница 24: ...ation on AC Insert the AC cord plug into a standard polarized AC outlet NOTES Use the attached power cord only 0 electrician replace the obsolete outlet 0 simply unplug the unit from the AC outlet and plug it back in The unit should return to normal operation Service Manual Model No 23 ...

Страница 25: ... item that you selected 5 SOURCE MENU CH CH VOL VOL STANDBY REAR AV Connections All the terminals are from left to right Audio input Power socket YPbPr component video input HDMI2 input Note 1 AV and YPbPr share one audio channel 2 When the HDMI2 port receives a DVI signal the audio signal is received from the YPbPr AV Audio channel AV composite video input REAR AV Connections SIDE All the termina...

Страница 26: ... viewed and what s onnext in DTVmode 12 FAV To access yourfavourite channels listin TV orDTV mode 13 VOL To adjust soundlevel 14 NUMERIC KEY For directaccess to channels 15 AUDIO To select theavailable audio languageof TV programs 16 MUTE To disable orenable the soundoutput 17 InUSB mode usedas next key in teletextmode used as list key 18 InUSB mode usedas previous key in teletextmode used as hold...

Страница 27: ...stop or resume sub page acquisition Theindication appears top left To freeze the page To display or hide the concealed information games solutions The user can set four favourite pages to be directly linked to the four color keys While list mode is activated it is not possibility to use TOP or FLOF navigation with the colourkeys The favourite pagenumbers should be stored and restored to from nonvo...

Страница 28: ...7 Electrical parts 7 1 Block diagram Service Manual Model No 26 06 ...

Страница 29: ...RX2BCLKP RX2BCLKN DDC2BSCL DDC2BSDA HDMI_E_CEC RX3B2P RX3B2N RX3B1P HOTPLUG2 RX3B1N RX3B0P HOTPLUG3 RX3B0N RX3BCLKP RX3BCLKN RX2B2P DDC3BSDA RX2B2N DDC3BSCL Page 7 07_PCMCIA OTG_DM OTG_DP OTG_DP1 OTG_DM1 USB_DETEC1 ON_USB1 TSSTART TSVALID TSCLK TS_MDI 7 0 TS_D 7 3 TS_CLK TS_MOSTART TS_MOVAL PCM_D 7 0 PCM_A 14 0 PCM_IRQA_N PCM_CE_N PCM_IOWR_N PCM_IORD_N PCM_WE_N PCM_OE_N PCM_REG_N PCM_WAIT_N PCM_RE...

Страница 30: ...16V C152 100uF 16V C134 NC 0 1u C134 NC 0 1u C159 1nF C159 1nF R274 1K R274 1K C131 220uF 16V C131 220uF 16V C143 0 1u C143 0 1u C121 0 1u C121 0 1u R282 4 7K R282 4 7K C138 0 1u C138 0 1u C151 0 1uF C151 0 1uF C150 100uF 16V C150 100uF 16V C148 0 1u C148 0 1u R278 100K R278 100K C126 100uF 16V C126 100uF 16V C124 0 1u C124 0 1u C133 0 1u C133 0 1u C144 0 1u C144 0 1u C136 100uF 16V C136 100uF 16V...

Страница 31: ...NC FB 1206 R415 NC 100K R415 NC 100K R386 NC 15K R386 NC 15K U19 TPA1517 U19 TPA1517 IN1 1 SGND 2 SVRR 3 OUT1 4 PGND 5 OUT2 6 VCC 7 M SB 8 IN2 9 GND HS 10 GND HS 11 GND HS 12 GND HS 13 GND HS 14 GND HS 15 GND HS 16 GND HS 17 GND HS 18 GND HS 19 GND HS 20 L81 NC FB 1206 L81 NC FB 1206 R355 NC 0R R355 NC 0R C217 NC 1000pF C217 NC 1000pF C242 NC 100n C242 NC 100n C197 NC 1uF C197 NC 1uF C225 NC 1000P...

Страница 32: ...uF C22 0 1uF R15 4 7K R15 4 7K R21 0R R21 0R R17 4 7K R17 4 7K C20 0 1uF C20 0 1uF L57 FB_56_OHM_4A L57 FB_56_OHM_4A C5 470uF 16V C5 470uF 16V R5 NC R5 NC C6 0 1uF C6 0 1uF C11 0 01uF C11 0 01uF R7 10K R7 10K R11 10K R11 10K R408 NC 0R R408 NC 0R C23 0 1uF C23 0 1uF R22 10k R22 10k C7 1nF C7 1nF J25 NC INVERTER J25 NC INVERTER 1 1 2 2 3 3 4 4 5 5 R10 10K R10 10K R14 4 7K R14 4 7K C14 0 1u C14 0 1u...

Страница 33: ...34 10K R34 10K J27 SCART_24 J27 SCART_24 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 23 23 22 22 24 24 25 25 26 26 R30 10K R30 10K C41 47n C41 47n J5 PC Audio Input J5 PC Audio Input 1 2 3 4 5 6 7 8 Q9 2N3904 Q9 2N3904 3 2 1 RX7 NC V800AA RX7 NC V800AA C50 100pF C50 100pF C51 1uF C51 1uF C57 100pF C57 100pF C37 100p C37 100p Q7 NC 390...

Страница 34: ... V800AA L66 FB_11_OHM_500MA L66 FB_11_OHM_500MA C80 10uF C80 10uF RX19 NC V800AARX19 NC V800AA L64 FB_11_OHM_500MA L64 FB_11_OHM_500MA R65 10K R65 10K R98 33R R98 33R R66 33R R66 33R J8 NC Audio J8 NC Audio 1 1 2 2 9 9 3 3 8 8 4 4 5 5 7 7 6 6 RX18 NC V800AARX18 NC V800AA R78 NC R78 NC C65 1nF C65 1nF R67 10K R67 10K C63 47nF C63 47nF C79 0 1uF C79 0 1uF R89 100K R89 100K R77 NC R77 NC R107 0R R107...

Страница 35: ...80010 RX46 NC V80010 RX22 NC V80010 RX22 NC V80010 D3 BAV70L D3 BAV70L 1 2 3 R120 NC 100R R120 NC 100R RX25 NC V80010 RX25 NC V80010 J15 DIP 20 2 10 J15 DIP 20 2 10 1 1 3 3 5 5 7 7 9 9 11 11 13 13 15 15 17 17 19 19 2 2 4 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 20 20 R115 1K R115 1K D4 BAV70L D4 BAV70L 1 2 3 R124 22K R124 22K R114 10K R114 10K R125 4 7K R125 4 7K R111 22K R111 22K RX47 NC V80010 RX...

Страница 36: ...0nF CS30 NC 10nF CS30 NC 10nF RS6 NC 1M RS6 NC 1M R138 NC 2 2K R138 NC 2 2K F1 U4 NC MXL301RF F1 U4 NC MXL301RF LNA_IN 2 AS 6 IDAC 3 VDD_DNX2 1 VBATT_A3 4 VAGC2 5 VBATT_A5 7 XTAL_N 8 XTAL_P 9 CLK_OUT 10 GND_XTAL 11 VREG_A_OUT1 12 VDD_DNX1 31 TF_2 30 TF_3 29 VREG_A_OUT2 28 VBATT_A2 27 VAGC1 26 NC 23 VBATT_A1 13 SCL 14 SDA 15 IF_OUTP 25 VDD_IO 16 GND_DIG 17 VREG_D_OUT 18 VREG_D_IN 19 VBATT_A4 20 VDD...

Страница 37: ...Power USB Interface PWR CTRL 5V card R411 10K R411 10K 1 2 F2 NC NSMD050 F2 NC NSMD050 J16 PCMCIA_CNT J16 PCMCIA_CNT GND 1 D3 2 D4 3 D5 4 D6 5 D7 6 CE1 7 A10 8 OE 9 A11 10 A9 11 A8 12 A13 13 A14 14 WE 15 READY 16 VCC 17 VPP1 18 MIVAL 19 MICLK 20 A12 21 A7 22 A6 23 A5 24 A4 25 A3 26 A2 27 A1 28 A0 29 D0 30 D1 31 D2 32 WP 33 GND 34 GND 35 CD1 36 MDO3 37 MDO4 38 MDO5 39 MDO6 40 MDO7 41 CE2 42 VS1 43 ...

Страница 38: ...S1_CLK Y20 PAD_TS1_SYNC R16 PAD_TS1_VLD W20 PAD_TS1_D 0 P18 PAD_TS1_D 1 R18 PAD_TS1_D 2 T18 PAD_TS1_D 3 W19 PAD_TS1_D 4 Y21 PAD_TS1_D 5 Y19 PAD_TS1_D 6 R21 PAD_TS1_D 7 T21 PAD_TS0_CLK U19 PAD_TS0_SYNC K19 PAD_TS0_VLD P20 PAD_TS0_D 0 K20 PAD_TS0_D 1 L20 PAD_TS0_D 2 M20 PAD_TS0_D 3 T14 PAD_TS0_D 4 U15 PAD_TS0_D 5 U13 PAD_TS0_D 6 T12 PAD_TS0_D 7 U18 PAD_IP W1 PAD_IM Y1 PAD_TGPIO0 RF_AGC_CTRL AA4 PAD_...

Страница 39: ...267 10k 7 5 3 1 8 6 4 2 RP20 75RX4 7 5 3 1 8 6 4 2 RP20 75RX4 7 5 3 1 8 6 4 2 RP22 22RX4 7 5 3 1 8 6 4 2 RP22 22RX4 R268 10k R268 10k 7 5 3 1 8 6 4 2 RP21 22RX4 7 5 3 1 8 6 4 2 RP21 22RX4 C119 1n C119 1n 7 5 3 1 8 6 4 2 RP25 75RX4 7 5 3 1 8 6 4 2 RP25 75RX4 7 5 3 1 8 6 4 2 RP27 75RX4 7 5 3 1 8 6 4 2 RP27 75RX4 7 5 3 1 8 6 4 2 RP24 22RX4 7 5 3 1 8 6 4 2 RP24 22RX4 7 5 3 1 8 6 4 2 RP17 22RX4 7 5 3 1...

Страница 40: ...ower board Service Manual Model No 7 3 Wiring Connection Diagram NO Name 1 2 3 4 5 Connection Wire For Keyboard and Remote Connection Wire For Speaker LVDS Wire Connection Wire Power For Mainboard 5 2 3 4 1 38 Material No 30444005301 ...

Страница 41: ...TV Manual Tuning Software Update USB Software Update OAD Off Dansk Deutsch Hrvatski Italiano Please select an OSD Language OK Magyar Nederlands Norsk Polski English Cesky E k Espanol Fran ais Portugues Pycck Austria Belgium Country OK Australia Croatia Finland Greece Luxembourg Czech France Hungary Netherlands Bulgaria Denmark Germany Italy Tune Type DTV ATV MENU Austria Belgium Australia Croatia ...

Страница 42: ...etext red button to store the channels after manualtuning 4 Program edit You can Delete Rename Move Skip or FAVany programs Rename You can only rename ATV programs Move the cursor to the program press teletext green button to renamethe program Press to choose the character Press to move the cursor Press MENU button to exit edit Press EXIT to exit the menu Note ATV programs name only can beonly 5 c...

Страница 43: ... 1 Tint is available in NTSC system only 2 There are four color temperature modes that can be selected medium warm cool user 3 Screen is available in PC mode only which can adjust Horizontal position vertical position size and phase 3 SOUND MENU The third item of the MENU is the SOUND MENU You can adjust the sound effect heresuch as treble bass balance etc Press to move press OK toadjust Balance A...

Страница 44: ...button to enter the DMP Menu PHOTO MUSIC MOVIE TEXT 6 LOCK MENU To enter the LOCK Menu press MENU button and then press or buttons to select the LOCK Menu The default password is 6666 Please set a new password so it is easy to remember Follow the on screen steps to set Set Password Lock System LOCK Block Program Parental Guidance Off 7 APPLICATIONS MENU To enter the Applications Menu press MENU bu...

Страница 45: ...hannel you are currently watching as well as the 7 Day Program guide 28 Apr 04 39 800 SZTVM01 No Information 801 SZTVM02 802 SZTVM03 803 SZTVM04 804 Date No Information No Information No Information No Information PROGRAMME GUIDE TIME Schedule INFO Remind OK INDEX 2 Press the teletext yellow key It can list all thereminder schedule press to choose the list press red key to delete the schedule list...

Страница 46: ...ust the color temperature and white balance of each signal source 4 SSC to adjust the spectrum for passing the EMC test 5 special set 1 2hour off for Aging test 2 WDT watch dog 3 white pattern set pure color output for the panel used at the checking and aging test for panel 4 reset 5 set the recorder 6 set power on screen display 6 QMAP adjust adjust color quality 7 PEQ set sound EQ 8 sw informati...

Страница 47: ...ou should choose Yes TV begin to update You should reset TV after update Note When Upgrade on the process please don t Power Off Haier MSD306 F W upgrade with USB SOP Step 1 Ready for F W Upgrade 1 1 Prepare a USB memory 0 0 Z 0 it from computer s USB port Step 2 F W Upgrade 2 1 AC ON 8 2 How to update software ...

Страница 48: ...Service Manual Model No 46 9 Trouble shooting 9 1 Simple check ...

Страница 49: ... Manual Model No 9 2 Main board failure check 1 Black creen 2 White screen 6 J2 11 8 11 on VCC pins of CJ20 Check if Q1is working Check if CJ20 is Signal on CJ20 Check QS Q6 and the 5 Is power LCD normal J2 47 ...

Страница 50: ...Service Manual Model No 48 3 Panel display abnormally connector j20 is at normal level ...

Страница 51: ... Check the speakers Y N Check if there is output at CJ26 Check if there is 12V input at PIN7of U19 Check if the power supply system is damaged short circuit or mis connected N Y Check if MUTE PIN of U19 is low voltage Check the volume control circuit from R302 U19 Y N Check if there is signal input at PIN1 PIN9 of U19 Check the volume input circuit from U8 to U19 N Y Replace U19 ...

Страница 52: ... at PIN6 of TUU2 N Y Y Y N Check the power supply circuit to this PIN Check if there is intermediate frequency signal output at PIN12 of TUU2 Check if there is I2C signal at PIN4 PIN5 of TUNER1 Check the I2C circuit between U8and TUU2 Check the tuner Check the signal circuit between U8 and TUU2 Fix the RF set N ...

Страница 53: ...Service Manual Model No 6 HDMI no picture or picture abnormal If J3 is R111 R112 R113 R114 R116 R117 Q11 Q12 51 ...

Страница 54: ...Service Manual Model No 52 7 PC no picture or picture abnormal ...

Страница 55: ...Service Manual Model No 8 YPBPR AV SCART no picture or picture abnormal Check Y 53 ...

Страница 56: ...or cracking Dim or L D TCP 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 V Dim Vertal gray line V L D Vertical color line light or dark forever H B D Horizontal bar H Dim Horizontal gary line H L D H o r i z o n t a l line light or dark forever ...

Страница 57: ...er Bubble Bladder in Polarizer Bladder between Polarizer and top glass Polarizer Scratch Polarizer Scratch Tine or rigidity arose F M i n s i d e Polarizer Eyewinker inside Polarizer Eyewinker inside Polarizer Circuit Abnormal Display Abnormal Display 1 Chip lose action 2 IC ahort or jointiog bad 3 Pannel and vsc connect bad Flashing B r i g h t a n d d a r k display alternately 55 ...

Страница 58: ...display Maybe caused by surge current and EDS Black Screen B L normal only Black screen display FIIcker Crosstalk LCD Vcom imbalance Abnormal Color Only color abormal Capacitance improper bring crosstalk inside LCD pannel Abnormal Color Only color abnormal 1 Chip lose action 2 I C s h o r t o r jointion bad 3 Pannel and vsc connect bad ...

Страница 59: ...ss between wire and electrode B L dark B L brightness darker than normal Connect badnessShort between wire and electrode B L wire damaged B L wire damaged Operation abnormal or systemic noise B L wire open Without backlight Operation abnormal or systemic noise B L shut down B L shutdown in sometime Short bitween lamp housing and wire Because consume power too much F M F M inB L white balck Rotundi...

Страница 60: ...ription Phenomena Failure cause Mechanlcal or B L Light leakage Brightness at bottom of LCM brighter than normal B L unit badness Uniformity B L brightness asymmetric Sheet in B L unit is uneven Mount hole Lack screw or screw damage Lack screw Screw damage ...

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