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July 2009 LCD DV

42LH40

18

Disassembly:

This section of the manual will discuss Disassembly, Layout and Circuit
Board Identification, of the 42LH40 LCD Direct View Television.

Upon completion of this section the Technician will have a better understanding of
the disassembly procedures, the layout of the printed circuit boards and be able to
identify each board.

Troubleshooting:

This section of the manual will also discuss troubleshooting.

Upon completion of this section the Technician will have a better understanding of
how to diagnosis and resolve problems.

DISASSEMBLY AND TROUBLESHOOTING SECTION

DISASSEMBLY AND TROUBLESHOOTING SECTION

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Summary of Contents for 42LH40 Series

Page 1: ...42LH40 Direct View LCD 42LH40 Direct View LCD 1080P Direct View LCD Published July 2009 Updated February 17 2010 ...

Page 2: ...ation Troubleshooting of Switch mode Power Supply Ballast Combination Section 1 Section 2 Contact Information Preliminary Matters Specifications LCD Overview General Troubleshooting Steps Signal Distribution Disassembly Instructions and Voltages Ft Control Board Side Keys ...

Page 3: ...ich can save time and money sometimes can be overlooked These techniques will also be presented This Section will get the Technician familiar with the Disassembly Identification and Layout of the LCD Display Panel At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Ass...

Page 4: ...lectronics Unauthorized modifications will not only void the warranty but may lead to property damage or user injury If wires screws clips straps nuts or washers used to complete a ground path are removed for service they must be returned to their original positions and properly fastened CAUTION CAUTION To avoid personal injury disconnect the power before servicing this product If electrical power...

Page 5: ...ce pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications However there i...

Page 6: ...m LG Web Training lge webex com LG CS Academy lgcsacademy com Published July 2009 by LG Technical Support and Training LG Electronics Alabama Inc 201 James Record Road Huntsville AL 35813 http 136 166 4 200 LG Learning Academy 32LG40 32LH30 37LH55 42LG60 42LG70 42LH20 42LH40 42LH50 47LG90 47LH85 42PG20 42PQ20 50PQ30 50PG20 50PS80 50PS60 LCD DV PLASMA Also available on Also available on the Plasma ...

Page 7: ...sensitive to static electricity Use caution when dealing with these IC and circuits 5 Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit 6 Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry 1 Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part numbe...

Page 8: ...examination using your senses the first check should always be the DC Supply Voltages to those circuits under test Always confirm the supplies are not only the proper level but be sure they are noise free If the supplies are missing check the resistance for possible short circuits Isolate To further isolate the failure check for the proper waveforms with the Oscilloscope to make a final determinat...

Page 9: ...July 2009 LCD DV 42LH40 9 This section of the manual will discuss the specifications of the 42LH40 LCD Direct View Display Panel 42LH40 Product Information 42LH40 Product Information ...

Page 10: ... 000 1 Dynamic Contrast Ratio TruMotion 120Hz Intelligent Sensor Mode 2 7ms Response Time GTG 500 cd m2 Brightness Wide Color Gamut Super IPS Panel Wide Viewing Angle XD Engine 24p Real Cinema ISFccc Ready Picture Wizard AV Mode II Cinema Sports Game 60 000 Hour Panel Life typical NTSC ATSC Tuners with Clear QAM ...

Page 11: ...ecifications LOGO Familiarization Basic Specifications LOGO Familiarization Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture July 2009 LCD DV 42LH40 11 ...

Page 12: ...ound Pixel Count to Resolution Comparisons Pixel Count to Resolution Comparisons FORMATS 480I 480P 1080I 720P 1080P Interlaced Progressive Interlaced Progressive Progressive Interlaced 2 Fields to make a Frame Progressive Each Field is a Frame Think of sync as the Panels Refresh Rate 240 Lines 480 Lines 540 Lines 720 Lines 1080 Lines NTSC SD HD HD HD Possible Frame Rates 24FPS 30FPS 60FPS 1080P BA...

Page 13: ...July 2009 LCD DV 42LH40 13 TOP PORTION BOTTOM PORTION Remote Control Familiarization Remote Control Familiarization ...

Page 14: ... Service Menu 1 Turn the Set On 2 Simultaneously Press and Hold the Menu Key on the Side Key pad and Press and Hold the Menu Key on the Remote approximately 5 seconds 3 If Customer s Menu appears continue to hold until it disappears 4 The Service Menu appears Note If a Password is required to enter the Service Menu Enter 0000 ...

Page 15: ...uly 2009 LCD DV 42LH40 15 Rear and Side Input Jacks Rear and Side Input Jacks Rear In Out Jacks USB Port Software Upgrades Music Photos Side In Out MAIN PWB Rear and Side Input Output locations Rear Side ...

Page 16: ... and push Enter button using the remote control 6 You can see the download progress Bar 7 Do not unplug until unit has automatically restarted 8 When download is completed you will see COMPLETE 9 Your TV will be restarted automatically USB DOWNLOAD USB DOWNLOAD Shows the Currently Installed Version Shows the Software Version found on the USB Flash Drive Shows the Software file found on the USB Fla...

Page 17: ...mm Center 3 7 8 97 8mm 2 9 16 65 7mm Weight without Stand 36 4 lb Weight with Stand 40 3 lb Wattage Average 143W Stand By less than 1W 3 1 2 88 9mm 11 9 16 294mm 20 7 16 518mm 12 15 16 327 8mm There must be at least 4 inches of Clearance on all sides 42LH40 Product Dimensions 42LH40 Product Dimensions 12 15 16 327 8mm 8 7 8 225 3mm 7 7 8 200mm 9 1 16 230mm 17 ...

Page 18: ...n will have a better understanding of the disassembly procedures the layout of the printed circuit boards and be able to identify each board Troubleshooting This section of the manual will also discuss troubleshooting Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems DISASSEMBLY AND TROUBLESHOOTING SECTION DISASSEMBLY AND TROUB...

Page 19: ...ted Pay attention to the size and type of screw as there are many different types Putting in an improper screw when reassembling may Cause damage The Stand does not need to be removed before removing the back Removing the Back Cover Removing the Back Cover ...

Page 20: ...ircuit Board Layout Circuit Board Layout POWER SUPPLY LVDS Cable Ft IR LED Control AC Input RF Input Speaker R Rear Inputs Master Power Switch Side Keys Speaker L Backlight Connections No T CON or Ballast board LVDS Cable Main PWB ...

Page 21: ...its current supplying ability The Primary fuse F501 now reads 380V 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2 Internally the power supply also sends B 390V voltage to the Ballast section but it is not turned on at this time When the power supply receives the INV ON command via P201 pin 20 it is routed to the driver for the ballast on the back of the board The drive...

Page 22: ...2 Power Power Supply PWB Supply PWB Removal Removal Disconnect P201 P401 P402 AC In SK101 and SK102 P201 AC In P401 P402 Press in Two tabs to release lock P201 SK102 S K 1 0 1 Remove the 6 screws indicated by the arrows w screw ...

Page 23: ...d This prevents any activity of the IR or the Key Board When the Switch is opened a line called Power Key pulls up high when ground opens This line feeds back to the Main board and from there it routes to the Power Supply The high tells the Controller chip to turn off STBY 5V When the switch is closed this same line called Power Key now goes high and feeds back to the Power Supply and tells the co...

Page 24: ...its current supplying ability The Primary fuse F501 now reads 380V 12V is routed out P201 pins 5 and 6 and 24V is routed out P201 pins 1 and 2 Internally the power supply also sends B 390V voltage to the Ballast section but it is not turned on at this time When the power supply receives the INV ON command via P201 pin 20 it is routed to the driver for the ballast on the back of the board The drive...

Page 25: ... LVDS Panel Control Inv On Off Other Circuits A DIM Fixed P DIM Other Circuits 9 9 Cust Menu for Backlight Picture Content Intelligent Sensor feedback BALLAST SECTION Relay On PWR Power Supply will not be on if Main Power Switch is off Ft Control Master Main Power Sw On Off POWER SUPPLY SMPS 5V General L L 8 Inverter On 380V Regulator 6 Manipulates Backlights Inverter On Starts the Ballast Drive S...

Page 26: ... 10 9 11 12 14 13 16 15 18 17 20 19 22 21 23 24 2 1 4 3 6 5 8 7 10 9 11 12 14 13 16 15 18 17 20 19 22 21 23 24 21 3V 24V Gnd Gnd Gnd Gnd Gnd Gnd n c n c n c n c E5 GPIO 134 L706 L704 24V C721 68uF C727 68uF L707 12V C722 47uF L701 R702 R257 G5 R719 1KΩ Q702 R713 0Ω R717 3 3KΩ GPIO 136 R244 100Ω 5V General Power On Inverter On Off 3 1 2 6 5 8 7 Q706 5V L715 5V General L709 LVDS 12V Panel Power L728...

Page 27: ...TBY 5V on either pin 7 8 9 or 10 5V If 5V Standby is not being generated the SMPS PWB is defective and must be replaced There is no need to continue with the next test b Unplug P700 on the Main PWB TEST 1 1 Add a 100Ω resistor between 5V STBY pin 7 8 9 or 10 and Pin 2 PWR Apply AC This will turn on the power supply a Check that the 24V and 12V power supplies are turned on P201 24V pins 17 and 18 P...

Page 28: ...S OK Backlights Abnormal a Recheck all connections b Confirm the INV On Off line pulling up to at least 3V REMOVE AC POWER c Check the connections to the Backlights DO NOT check these when AC is applied as they carry 1 2Kv each Note either of the connections are unplugged the backlights will not light TEST 2 Power Supply PWB Backlights Test TEST 2 Power Supply PWB Backlights Test P700 Connector di...

Page 29: ...nformation General Backlight Information To Backlights Over 1 2KV Currently number of lamps Unknown To Backlights Over 1 2KV Ballast Section of SMPS EEFL External Electrode Fluorescent Lamp LOW COST Large number of lamps driven by a single inverter ...

Page 30: ...09 LCD DV 42LH40 30 Simple structure Low price Complicated structure Simple structure Lamp manufacturing process Lamp assembly structure Low Cost Large number of Lamp Drive by single inverter Introducing EEFL ...

Page 31: ...LH40 31 Introducing EEFL Contacts Bulb Design Key Long Life Time For CCFL Hg gas is consumed mainly near the internal electrode For EEFL longer life time is expected because there is no internal electrode consuming Hg gas ...

Page 32: ... SMPS Layout Ballast Section of SMPS Layout To Backlights Left Side T703 T704 Viewed from rear To Backlights Right Side SMPS PWB Backlights Test Point Bottom of R406 or R403 38V P P 1 2Kv 48Khz July 2009 LCD DV 42LH40 32 ...

Page 33: ...KΩ R244 100Ω G5 VBR A Analog Dimming This line is not used P700 POWER SUPPLY RL ON PWR 4 89V 2 12V Reg 24V Reg 13 14 17 18 390V BALLAST SECTION 1 67V IC301 380V Reg 160V Reg ERR 0V 22 P201 MAIN PWB 20 24 21 2 13 14 17 18 22 IC600 Ballast Control IC 12V 24V On Back of PWB On Back of PWB INV On Off To Backlights 1 2Kv Two Transformers Drive Circuit FETs Q709 10 Drive Control Q702 R704 4 7KΩ R759 0Ω ...

Page 34: ...r in the ballast drive IC ADIM also manipulates the Burst Triangle Oscillator But it is not used Note Backlights will attempt to fire 4 time During these attempts the Error line will change from 5V to 0V 0V when lamp tries to fire or is lit 5V when the lamps are not lit After 4 attempts if the Error Out line returns to 5V this tells the Micro to turn the set off ...

Page 35: ...20 Open 0V 0V Err Out 22 Open 3 2V 0V 2 PDIM 24 Diode Check Run STBY Label Pin P201 Even SMPS to P700 Main PWB nc nc nc nc 1 Gnd Gnd Gnd Gnd 3 Gnd Gnd Gnd Gnd 5 2 85V 5 14V 5 14V 5V 7 2 85V 5 14V 5 14V 5V 9 Gnd Gnd Gnd Gnd 11 1 2V 12 3V 0V 12V 13 Gnd Gnd Gnd Gnd 15 0 81V 21 4V 0V 24V 17 nc nc nc nc 19 Open 1 66V 0V 1 A DIM 21 nc nc nc nc 23 Diode Check Run STBY Label Pin P201 Odd SMPS to P700 Main...

Page 36: ...nd 2 for STBY and RUN OL N 2 OL 120Vac L 1 Diode Check Run STBY Label Pin AC Voltage Readings for either pin 1 or pin 2 in STBY and RUN with one lead on Neutral of SK100 OL n a 2 OL 120Vac n a 1 Diode Check Run STBY Label Pin SK100 SMPS to AC IN SK101 SMPS to MASTER POWER SWITCH SK101 SK100 Bottom Right of SMPS Live Neutral With the Master Power Switch Closed On AC flows When Open Off AC open and ...

Page 37: ...LVDS video signal that has already been prepared for the panel drivers The Main board receives its operational B from the Power Supply via P700 STAND BY STBY 5V pins 7 10 The Main board also develops several B sources on the board LVDS VCC LCM 3 3V VDD LCM 16V VGH 24V VGHM 24V VGL 5V AUDIO 3 3V 1 8V Mstar IC100 Video MICROPROCESSOR 1 2V 1 26V 1 8V and 3 3V RUN 12V pins 13 and 14 24V pins 17 and 18...

Page 38: ... arrows P600 P1200 P700 Flip the locking tab upward pull the LVDS ribbon out NOTE Be sure to check on top and behind the Video Processor ICs Look for a piece of Chocolate Heat Transfer Material Be sure to transfer to new PWB if present Disconnect P700 P1204 P600 P1400 and P1401 P1400 P1401 Press in on the top and bottom release tabs to remove P700 ...

Page 39: ... IC100 and Tru Motion IC1100 run Hot This is normal 1 19 P700 To SMPS P1400 P1200 X100 USB Tuner TU1001 P1400 P1401 to Panel To Speakers SW100 Reset X1005 P600 LD1000 Tuner OK when Green LD1000 IC100 IC100 Microprocessor and Video Processor X1100 P1401 IC1100 To Ft Control PWB To SMPS ...

Page 40: ...July 2009 LCD DV 42LH40 40 Main PWB Front Side Component Locations Main PWB Front Side Component Locations ...

Page 41: ...Gnd 7 1 8V IC1000 Flash Boot 8 Gnd 8 3 19V 8 3 2V B 0V 8 4 83V Pin Memory C 1 96V 1 0V IC704 3 3V Reg Q706 5V General IC708 3 3V Reg IC601 1 8V Amp 2 3 36V Pin Pin LVDS 12V Pin Q106 Reset Pin 3 3 36V 1 0 79V 1 5 1V 1 Gnd Pin 1 Gnd 4 n c 2 Gnd 2 Gnd 2 0 79V E Gnd 2 1 8V 5 n c 3 5V 3 12V 3 1 26V B 0V 3 3 3V 6 1 19V 4 7 7V 4 0 67V 4 1 26V C 3 3V 7 0 79V 5 4 9V 5 12V 5 1 8V 8 Gnd 6 3 3V 6 12V 6 5V 7 3...

Page 42: ...July 2009 LCD DV 42LH40 42 Main PWB Main PWB Back View Back View ...

Page 43: ... IC1101 Flash IC1100 LD1100 Driver 3 Gnd IC1201 RS232 Pin Q600 Audio Mute Pin 4 1 6V Pin 1 0V Pin Q705 Turns on LVDS G 0 29V 5 3 25V 1 3 3V 2 1V E 0 1V Pin 12V Q706 D 2 9V 2 5 6V 3 3 26V C 3 2V E 0V S 0V D1100 LD1100 Q1100 3 0V 4 Gnd B 0V C 0V Pin Gate 4 0V 5 0V B 0 66V A 0V 5 5 5V 6 0 1V Q701 PWR On to IC107 Power Det K 0 33VV 6 5 5V 7 3 26V Pin P700 pin 2 IC105 HDCP EEPROM Pin Reset 7 5 5V 8 3 2...

Page 44: ...eck Main PWB X100 X1100 and X1005 Crystal Check 3 2Vp p 12Mhz Set on or off Use bottom leg IC100 Microprocessor Crystal MAIN PWB Tuner Control IC1005 Crystal 4 95Vp p 25Mhz X100 X1100 Set on Use bottom leg 2 4Vp p 12Mhz Set on Use top leg TruMotion IC1100 Crystal X1005 ...

Page 45: ...WB LD1000 Function Main PWB LD1000 Function Main PWB LD1000 Location LD1000 Use LD1000 as a visual aid This lets you know if the tuner internal PLL Phase Locked Loop system is locked Illuminated PLL is normal Off is abnormal tuner lock ...

Page 46: ...July 2009 LCD DV 42LH40 46 Main PWB Tuner with Shield Off Pin ID Main PWB Tuner with Shield Off Pin ID 1 19 18 4 13 12 9 8 ...

Page 47: ...o and SIF Output Check 450mVp p Pin 19 Video Signal Pin 16 SIF Signal 2 24Vp p USING COLOR BAR SIGNAL INPUT Pin 12 and Pin 13 Dig IF Signal Note Dig IF Signal only when receiving a Digital Channel 700mVp p Note Video Out Signal only when receiving an analog Channel MAIN PWB Tuner Location ...

Page 48: ... DV 42LH40 48 Main PWB Tuner Clock and Data Lines Main PWB Tuner Clock and Data Lines Pin 8 SDA 100uS 1V per div 5V p p Pin 9 SCL 100uS 1V per div 5V p p Note SCL and SDA only active during an actual Channel Change ...

Page 49: ...July 2009 LCD DV 42LH40 50 Main Board LVDS Power Supply Voltage Generation Circuit Main Board LVDS Power Supply Voltage Generation Circuit VCC 3 3V VGL 5V VGHM 26V VDD 16V ...

Page 50: ...nd Gnd Gnd Gnd 6 Gnd Gnd Gnd Gnd 4 1 87V 4 98V 0V PWR ON 2 Diode Check Run STBY Label Pin nc nc nc nc 23 2V 1 7V 0V 1 A DIM 21 nc nc nc nc 19 Open 21 4V 0V 24V 17 Gnd Gnd Gnd Gnd 15 2 1V 12 3V 0V 12V 13 Gnd Gnd Gnd Gnd 11 1 1V 5 14V 5 14V 5V 9 1 1V 5 14V 5 14V 5V 7 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 3 nc nc nc nc 1 Diode Check Run STBY Label Pin 1 ADIM Pin 21 Fixed and not used 2 PDIM Pin 24 can va...

Page 51: ... 1 28V LMLV0N 40 1 29V 1 2V LMLV1P 39 1 29V 1 3V LMLV1N 38 1 29V 1 2V LMLV2P 37 1 29V 1 3V LMLV2N 36 0 89V 1 23V LMLV3P 35 1 29V 1 23V LMLV3N 34 1 29V 1 25V LMCLKP 33 1 29V 1 26V LMCLKN 32 1 29V 1 2V LMLV5P 31 0 9V 1 2V LMLV5N 30 1 3V 1 21V LMLV6P 29 1 29V 1 22V LMLV6N 28 1 24V 1 25V LMLV7P 27 1 29V 1 2V LMLV7N 26 1 29V 1 23V LMLV8P 25 1 29V 1 2V LMLV8N 24 Gnd Gnd Gnd 23 1 45V 0 2V SOE_L 22 1 3V 1...

Page 52: ... 1 3V 1 22V RMLV1N 40 1 3V 1 26V RMLV2P 39 1 3V 1 19V RMLV2N 38 1 3V 1 26V RMLV3P 37 1 3V 1 21V RMLV3N 36 1 3V 1 23V RMCLKP 35 1 3V 1 25V RMCLKN 34 1 3V 1 25V RMLV5P 33 1 3V 1 19V RMLV5N 32 1 3V 1 2V RMLV6P 31 1 3V 1 2V RMLV6N 30 1 3V 1 21V RMLV7P 29 1 3V 1 19V RMLV7N 28 1 3V 1 25V RMLV8P 27 0 89V 1 2V RMLV8N 26 Gnd Gnd Gnd 25 1 5V 0 2V SOE 24 1 3V 1 62V POL 23 1 3V OV GSP 22 Open OV H_CONV 21 Dio...

Page 53: ... taken with all Connectors Removed P1204 CONNECTOR MAIN PWB to P1 Front IR LED PWB Assy 2 17V 3 29V 0V POWER On Off 12 0 6V 3 29V 3 29V 3 3V_ST 11 Gnd Gnd Gnd Gnd 10 Open 4 8V 4 8V IR 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 1 13V 5 1V 5 1V 5V ST 6 1 08V 3 3V 3 3V Key2 5 1 08V 3 3V 3 3V Key1 4 Gnd Gnd Gnd Gnd 3 1 14V 3 3V 3 3V SDA 2 1 14V 3 3V 3 3V SCL 1 Diode Check Run STBY Label Pin ...

Page 54: ...ector P600 to Speakers Voltage and Resistance Diode Mode values taken with all Connectors Removed SPK L SPK L SPK R SPK R LABEL 1 5V 10 7V 0V 4 1 5V 10 7V 0V 3 1 5V 10 7V 0V 2 1 5V 10 7V 0V 1 Diode Check Run SBY Pin P600 CONNECTOR Main to Speakers Use speaker out to test for defective Audio Amp IC600 ...

Page 55: ... it operating B via pin 6 STBY 5V and pin 11 STBY 3 3V on connector P1 It is received from the Main PWB via the connector P1200 The Intelligent Sensor communicates with the Video Processor IC100 via clock and data lines on the same connector pins 1 and 2 The IR pulses 5V p p are sent to the Microprocessor same IC100 via pin 9 The Key board connector P3000 is routed to the Ft control board via P2 T...

Page 56: ... 42LH40 56 FRONT CONTROL BOARD CONNECTIONS IDENTIFIED FRONT CONTROL BOARD CONNECTIONS IDENTIFIED The below picture shows the connections to the Front Control board Side Key P3000 P2 P1 Main Power Switch p n EBR59216901 ...

Page 57: ...D FRONT CONTROL IR and INTELLIGENT SENSOR IDENTIFIED The Front Control PWB located on the bottom left as viewed from the rear contains the IR Infrared Remote Sensor and the Intelligent Sensor plus the front Power LEDs Intelligent Sensor Infrared Sensor Light Diffuser Power LEDs ...

Page 58: ...P1204 MAIN PWB Open 3 29V 0V POWER On Off 12 Open 3 29V 3 29V 3 3V_ST 11 Gnd Gnd Gnd Gnd 10 Open 4 8V 4 8V IR 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 1 13V 5 1V 5 1V 5V ST 6 Open 3 3V 3 3V Key2 5 Open 3 3V 3 3V Key1 4 Gnd Gnd Gnd Gnd 3 Open 3 3V 3 3V SDA 2 Open 3 3V 3 3V SCL 1 Diode Check Run STBY Label Pin P2 Connector to Side Key P1 Gnd Open Gnd Open Diode Check Gnd Key 2 Gnd Key 1 Label Gnd Gnd 4...

Page 59: ...July 2009 LCD DV 42LH40 59 Side Key Assembly Side Key Assembly To Ft Control P3000 SW3008 SW3007 SW3006 SW3005 SW3004 SW3003 SW3002 SW3001 P3000 c ...

Page 60: ...nd 10K Ohms 4 8K Ohms 1 8K Ohms 270 5 Ohms Pin 1 measured from Gnd Enter Menu Input Power KEY P3000 Voltage Measurements with Key pressed CH Up CH Dn Volume Volume KEY 2 24V 1 65V 0 906V 0 179V Pin 3 measured from Gnd 2 24V 1 65V 0 906V 0 179V Pin 1 measured from Gnd Enter Menu Input Power KEY P3000 Connector Side Key to IR LED Control PWB P1 Gnd Key2 Gnd Key1 Label Gnd Open Gnd Open Diode Check G...

Page 61: ...contains the full progression of the Invisible Speaker system First The woofer layout is the basic system The Full Range Speakers point downward so there is no front viewable speaker grill or air ports Tweeter p n EAB58536001 Full Range p n EAB58534502 Tweeter High Frequencies Main Speaker Full Range Frequencies Magnet Weight Prevents vibrations ...

Page 62: ...phragm only voice coil Outlined Circle Speaker Attachment post Cabinet works as a diaphragm 2nd Progression Elimination of the conventional speaker The front bezel is shown below Note the outlined circle is the location for the front sticky pad on the Invisible Speaker This prevent the coil from bouncing off the plastic causing vibrations WARNING Removing the Tweeter will destroy the speaker as sh...

Page 63: ...stem Overview Invisible Speaker Shown separately Front to left has sticky surface which adheres to front bezel Note there is no Cone Diaphragm only voice coil Spider Dust Cap with adhesive Voice Coil Inside Magnet Frequency Pass Capacitor Mount Mount Speaker Wires Speaker Terminals ...

Page 64: ...sion of the Training Manual The Adobe version of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier zoom in and out making reading of the small text easier This Power Point shows a graphical representation of the 11 X 17 This Power Point shows a graphical representation of the 11 X 17 fold...

Page 65: ...V STBY 157V From Hot Gnd F 5 0 1 SMPS Switch Mode Power Supply F100 6 3A 250V AC IN T704 T703 1 2KV Main Power SW Side Key Controls P1 Front PWB Assembly IR Receiver Intelligent Sensor P3000 P2 IC100 Micro and Video Processor Mstar Tuner P2 Front IR LED PWB to P3000 Keys 1 2KV TO TFT MODULE Pin 2 5V Pin 4 26V Pin 56 57 58 16V Pin 53 54 3 3V Pin 3 4 5 16V Pin 7 8 3 3V Pin 59 5V Pin 57 26V Component...

Page 66: ...5V 11 0V 1 Gnd 4 Gnd D102 Audio Mute 12 3 3V 2 3 3V Q702 INV On to 5 5 05V Pin Routing 13 0V 3 5 1V Pin P700 pin 20 6 5 05V A 0V 14 5 6V E 0V 7 3 25V K 0 1V 15 Gnd C 3 8V 8 3 25V A 0V 16 3 3V B 0V 42LH40 MAIN FRONT SIDE SIMICONDUCTORS IC701 1 8V DDR IC705 3 3V 1 26V IC101 Flash Boot IC103 Reset IC707 5V EXT IC1001 3 3V FE Pin Pin Pin Memory Pin Pin 1 8V MEMC Pin 1 n c 1 0 8V 1 0V 1 Gnd 1 0 8V 1 4 ...

Page 67: ...42LH40 42LH40 Direct View LCD This concludes the 42LH40 training session ...

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