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LG 42LG70 Training Manual
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LG 42LG70 Training Manual

42” class lcd 1080p hdtv
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Download this manual See also: Service Manual, Owner's Manual
42LG70
FULL HD 1080P RESOLUTION
Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture.
INTELLIGENT SENSOR
Unlike other sensors which can only sense brightness of ambient light, LG's "Intelligent Sensor" uses 4,096 sensing steps to evaluate its
surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness
and white balance. The result is a picture optimized for it's surroundings, more pleasing to watch and which can also save up to 50% in
power consumption.
24P REAL CINEMA
Hi-def movies run at the 24 frames per second speed that they were originally filmed in, making your home-cinema experience one step
closer to a "Real Cinema" experience.
CLEAR VOICE TECHNOLOGY
Automatically enhances and amplifies the sound of human voice frequency range to provide high-quality dialogue when background noise swells.
LG SIMPLINK
Allows for convenient control of other LG SimpLink products using the existing HDMI connection.
42" CLASS LCD 1080P HDTV
(42.0" diagonal)
• Full HD 1080p Resolution
• 40,000:1 Dynamic Contrast Ratio
• TruMotion 120Hz
™
• 4x HDMI
V.1.3 with Deep Color
• Intelligent Sensor
• 24p Real Cinema
• AV Mode (Cinema, Sports, Game)
• Clear Voice
™
• LG SimpLink
Connectivity
• Invisible Speaker System
• USB 2.0 (JPEG, MP3)
• ISFccc

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Summary of Contents for LG 42LG70

  • Page 1 Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. INTELLIGENT SENSOR Unlike other sensors which can only sense brightness of ambient light, LG’s “Intelligent Sensor” uses 4,096 sensing steps to evaluate its surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness and white balance.
  • Page 2 243-0000 • LGusa.com © 2008 LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG Life’s Good” is a registered trademark of LG Corp. All other trademarks are the property of their respective owners. Design, features and specifications subject to change without notice. 08/04/08...

  • Page 3: Training Manual

    42LG70 42LG70 Training Manual LCD DIRECT VIEW Published March 2009...
  • Page 4 LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages Section 2 Circuit Board Operation, Troubleshooting of : • Switch mode Power Supply • Ballast Board • Main Board • T-CON Board • Ft Control Board March 2009 LCD DV 42LG70...

  • Page 5: Overview Of Topics To Be Discussed

    Overview of Topics to be Discussed Overview of Topics to be Discussed 42LG70 LCD Direct View Display Section 1 This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.

  • Page 6: Preliminary Matters (The Fine Print)

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

  • Page 7: Esd Notice

    Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help. March 2009 LCD DV 42LG70...

  • Page 8: Lg Contact Information

    Audio/Video and Screen Marks LG Web Training lge.webex.com LG CS Academy lgcsacademy.com http://136.166.4.200 32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80, LCD-DV: 47LG90, 47LH85 42PG20, 42PQ20, 42PQ30, 50PG20, 50PS80, 50PS60, 60PS11 PLASMA: Plasma Panel Also available on the...
  • Page 9 1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy. 2. Check the model label. Verify model names and board model matches. 3. Check details of defective condition and history. Example: Oscillator failure dead set, etc… March 2009 LCD DV 42LG70...

  • Page 10: Basic Troubleshooting Steps

    The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer. March 2009 LCD DV 42LG70...

  • Page 11: 42Lg70 Product Information Section

    42LG70 PRODUCT INFORMATION SECTION 42LG70 PRODUCT INFORMATION SECTION This section of the manual will discuss the specifications of the 42LG70 LCD Direct View Display Panel. March 2009 LCD DV 42LG70...
  • Page 12 • 4x HDMI™ V.1.3 with Deep Color • Intelligent Sensor • 24p Real Cinema • AV Mode (Cinema, Sports, Game) • Clear Voice • LG SimpLink™ Connectivity • Invisible Speaker System • USB 2.0 (JPEG, MP3) • ISFccc March 2009...

  • Page 13: Basic Specifications (Logo Familiarization)

    Intelligent Sensor Unlike other sensors which can only sense brightness of ambient light, LG’s “Intelligent Sensor” uses 4,096 sensing steps to evaluate its surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness and white balance.
  • Page 14 SIMPLINK Allows for convenient control of other LG SimpLink products using the existing HDMI connection. Invisible Speaker System A new invisible speaker system tuned by renowned audio expert, Mr. Mark Levinson.

  • Page 15: Remote Control Familiarization

    Remote Control Familiarization Remote Control Familiarization BOTTOM PORTION TOP PORTION March 2009 LCD DV 42LG70...

  • Page 16: Accessing The Service Menu

    4) The Service Menu appears Note: It is possible, dependant upon the Software Version, a Password may be required to enter the Service Menu. If a password is required, enter 0000 March 2009 LCD DV 42LG70...

  • Page 17: Rear And Side Input Jacks

    Rear and Side Input Jacks Rear and Side Input Jacks Rear Input Jacks Side Input Jacks Main Board Orientation March 2009 LCD DV 42LG70...
  • Page 18 42LG70 Product Dimensions 42LG70 Product Dimensions 42LG70 Dimensions There must be at least 4 inches of Clearance on all sides 40.4" 4.4" 1026.16mm 111.8mm 7.9" 16.1" 200mm 410mm 7.9" 200mm 5.4" 7.9" 138mm 27.1" 200mm 688.34mm Model No. Center Serial No.

  • Page 19: Disassembly Section

    DISASSEMBLY SECTION This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42LG70 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.
  • Page 20 The Stand does not need to be removed Remove the 16 screws indicated. Pay attention to the size and type of screw as there are many different types. Putting in the improper screw when reassembling may Cause damage. March 2009 LCD DV 42LG70...
  • Page 21 Power Supply Board Removal Power Supply Board Removal P201 Disconnect P201, AC In and P204. Remove the 4 screws indicated by the arrows. March 2009 LCD DV 42LG70...

  • Page 22: Main Board Shield Removal

    Remove the plastic piece. Remove the two pieces of tape on the left side holding down the cables and the one at the top. Remove the remaining 11 screws indicated by the arrows. March 2009 LCD DV 42LG70...

  • Page 23: Main Board Removal

    P404 removal process. NOTE: Look carefully on top and behind the BCM and Micronas IC. Look for a piece of Chocolate (Heat Transfer Material). Be sure to transfer to new Board if replaced. P501 March 2009 LCD DV 42LG70...

  • Page 24: T - Con (Tft Drive) Board Removal

    Lift up the left bracket and work the They would already be removed in the shield out and off. previous step. Disconnect CN1, CN2, CN4 and CN5. See next slide for details. Remove and save the tape over the LVDS Cables March 2009 LCD DV 42LG70...
  • Page 25 Then the flex cable can be easily removed. CN2; Press in on the two tabs and slowly Unlocked rock the cable out of the connector. Fig 2 (Shown by the arrows in Fig 3) The locking tab is flipped upward March 2009 LCD DV 42LG70...

  • Page 26: Troubleshooting Section

    TROUBLESHOOTING SECTION TROUBLESHOOTING SECTION This section of the manual will discuss troubleshooting. Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems. March 2009 LCD DV 42LG70...

  • Page 27: Circuit Board Layout

    T-CON Under Shield To Left Side LVDS Cables POWER SUPPLY Ballast Under Main “Digital” Shield Under Shield Input Backlight Side Inputs Connection To Right Side Rear Inputs Tweeter AC Input Tweeter Side Woofer Woofer Ft Control Controls March 2009 LCD DV 42LG70...

  • Page 28: Power Supply Section

    Power Supply (SMPS) Board Layout Power Supply (SMPS) Board Layout P204 To Ballast Not used P201 To Main F101 3.15A/250V Run 385.7V Stby 155.8V From Hot Gnd F100 Hot Ground Shock Hazard 6.3A/250V AC IN AC IN March 2009 LCD DV 42LG70...
  • Page 29 42LG70 Power Supply Turn On Sequence 42LG70 Power Supply Turn On Sequence TURN ON SEQUENCE Inverter On Inverter Starts the Ballast In Stand-By In Run (PWR On) Backlights Light Primary side is Primary side is 370V AC In 24V B+ for the Ballast...
  • Page 30 42LG70 Power Supply Controls from Main 42LG70 Power Supply Controls from Main L812 L901 LVDS 12V SBY5V C820 Q804 Q900 0.1uF MAIN C852 SMPS 0.1uF P201 P800 C813 10uF C851 Q803 Q901 100uF C846 LVDS Panel RELAY ON R868 R900...
  • Page 31 24 Volt Supply. Confirm Pin 12 of P204 went to 3.3V. This is the INV ON signal needed to light the Lamps. Problems with either voltage can be easily solved by following the simple steps on the next page. March 2009 LCD DV 42LG70...

  • Page 32: Test 1 Power Supply Board Low Voltage Test

    P201 (16V pins 1 and 2) (12V pins 5 and 6) b) Check that the 24V on P204 pins 1~5 (Ballast Voltage) is turned on. (3) Remove AC power. Reinsert the plug P204 to the ballast. March 2009 LCD DV 42LG70...
  • Page 33 NOTE: Pin 11 and 12 on P204 or Pin 12 and 13 on P201 (ADIM/PDIM) must be above 1V or the backlights will be extremely dim. This is controlled by the Customer’s OSD settings. 0% (0.9V) to 100% (3.3V). Manipulated by the BCM Chip. (Video Processor) March 2009 LCD DV 42LG70...

  • Page 34: Power Supply Connector P201 Voltage And Diode Check

    PDIM Pin 22 can vary according to type of signal being processed, OSD Backlight setting. 0.9V 0% to 3.3V 100% and the Intelligent Sensor. Output from the BCM chip. Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...
  • Page 35 PWM-DIM (PDIM Pin 22) can vary according to type of signal being processed, OSD Backlight setting. 0.9V 0% to 3.3V 100% and the Intelligent Sensor. Output from the BCM chip. Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...

  • Page 36: Backlight Section

    BACKLIGHT SECTION Backlight Layout Backlight Layout Ballast To Backlights Over 1.2KV To Backlights Over 1.2KV Currently, number of lamps “Unknown” EEFL (External Electrode Fluorescent Lamp) LOW COST Large number of lamps driven by a single inverter March 2009 LCD DV 42LG70...
  • Page 37 EEFL Compared to CCFL EEFL Compared to CCFL Simple structure, Low price Simple structure Low Cost Complicated structure Lamp manufacturing process Large number of Lamp Lamp assembly structure Drive by single inverter March 2009 LCD DV 42LG70...
  • Page 38 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 March 2009 LCD DV 42LG70...
  • Page 39 Ballast Board Layout Ballast Board Layout To Backlights Left Side BALLAST p/n EAY56798701 MCN1 To Power Supply Protects 24V 15A/65V To Backlights Right Side March 2009 LCD DV 42LG70...
  • Page 40 Ballast Board Transformer Check Ballast Board Transformer Check ANY TRANSFORMER PRIMARY Caution: Over 1.2kV SIDE WAVEFORM CHECK 1V p/div 5us p/div 5V p/p 2 3 4 5 1V p/div 5us p/div 4.3V p/p March 2009 LCD DV 42LG70...
  • Page 41 42LG70 Backlight Controls from Main 42LG70 Backlight Controls from Main 42LG70 P800 ON MAIN BOARD TO P201 SMPS TO MCN1 BALLAST SMPS BOARD MAIN BOARD BALLAST P201 P800 MCN1 P204 IC407 R485 R838 RL ON 30 P5.7/CLK02 2.86V C847 INV ON/OFF INV-On/Off 0.1uF...
  • Page 42 Power Supply Backlight Drive Signal Effects Power Supply Backlight Drive Signal Effects VBR-B PWMDIM manipulates the Burst Triangle Oscillator in the ballast drive IC. VBR-A BR1 (ADIM) also manipulates the Burst Triangle Oscillator But it is not used. March 2009 LCD DV 42LG70...
  • Page 43 Ballast Board Layout Back View (RF Noise Dampening Pads) RF NOISE DAMPENING AND HEAT TRANSFER MATERIAL PADS. MAKE SURE TO SAVE THESE IF REPLACING THE BALLAST. There is a white box outlined on the Board silk screen indicating where the Chocolate goes. March 2009 LCD DV 42LG70...
  • Page 44 THE BALLAST. BALLAST SHIELD MAKE SURE THEY ARE PLACED IN THE CORRECT LOCATION BEFORE REINSTALLING THE Insulates and Heat SHIELD. Transfer for Q7, Q8, Q9 and Q10 Insulates and Heat Transfer for T3 and T4 March 2009 LCD DV 42LG70...

  • Page 45: Ballast Connector Mcn1 Voltage And Diode Check

    VBR-A Pin 11 Fixed and not used VBR-B Pin 13 can vary according to type of signal being processed, OSD Backlight setting. 0.9V 0% to 3.3V 100% and the Intelligent Sensor. Output from the BCM chip. March 2009 LCD DV 42LG70...
  • Page 46 ( easily measured at fuse F1). Diode LD1 is a boot up indicator and is helpful in troubleshooting as a quick indication of a loss of supply and or a Boot Up problem. LG Philips LCD Drive IC Next 2 Slide...
  • Page 47 CON (TFT DRIVE) Board with Shield CON (TFT DRIVE) Board with Shield Two LVDS feeds from Main Board March 2009 LCD DV 42LG70...

  • Page 48: T - Con (Tft Drive) Board (Shield Removed)

    CON (TFT Drive) Board (Shield Removed) CON (TFT Drive) Board (Shield Removed) T-CON p/n EAT56803001 To TFT Panel To TFT Panel Remember to replace screws for ground purposes if turning on the set is required. Control March 2009 LCD DV 42LG70...

  • Page 49: T - Con (Tft Drive) Board Checks

    Check Fuse backlights illuminate if all is OK. F1 for 12V Power Off Power 1 Power On Anode 0V Anode 11.6V Anode 11.6V Cathode 0V Cathode 0V Cathode 9.5V LED OFF LED ON LED OFF March 2009 LCD DV 42LG70...

  • Page 50: Input Signal Processing

    • Quadruple 12 Bit LVDS to the T-CON Board • Audio output signals to the Speakers • Digital Audio Output Coaxial and Optical • ON OFF Controls to the SMPS turning on low voltage generation and Backlights • Backlight intensity control signals March 2009 LCD DV 42LG70...

  • Page 51: Main Board Micronas Ic1000 Chip Overview

    24 frames per second system used for recording, the picture develops visual artifacts when converted to 60 frames per second. 3:2 Pull Down was developed to eliminate this problem. Frame Rate Conversion (Real Cinema) eliminates the need for 3:2 Pull Down. March 2009 LCD DV 42LG70...

  • Page 52: Trumotion 120Hz ( Vector Based Motion Compensation)

    TruMotion 120 Hz can reduce blurring on fast moving scenes. TruMotion carefully analyses the picture signal by using advanced algorithms to automatically calculate a new image frame between each original frame (MEDI). Conventional Conventional TruMotion (120Hz) March 2009 LCD DV 42LG70...
  • Page 53 Frame Rate Conversion eliminates the need for 3:2 Pull Down Conversion An irregular sequence of Frames in a movie or video image 1/24 (sec) (Film 24FPS) 1/60 (sec) Conventional (60Hz) 1/120 (sec) (120Hz) Scene A Scene B Scene C March 2009 LCD DV 42LG70...

  • Page 54: Mainboard Layout

    Look carefully on top and behind the BCM IC and If video returns Micronas IC for to normal, Chocolate (Heat Transfer) Board needs to material. be replaced. Be sure to transfer to new Board if replaced. P501 Speakers March 2009 LCD DV 42LG70...
  • Page 55 42LG70 Main Board (Back View) 42LG70 Main Board (Back View) P1001 P1000 IC1005 IC1000 IC1007 IC1006 P800 Voltages are also IC810 given in the Interconnect Diagram IC1003 IC1004 Page IC809 Pin 16 IC805 IC406 IC404 IC400 IC802 X200 TUNER BCM Reset...

  • Page 56: Main Board (Front Side Regulators) Voltages

    STBY Label Q901 STBY Label Function: 5V-TU Regulator Function: Turns on Q900 LVDS Switch Pin 1 Input 0.7V LVDS-Panel-Control Pin 2 3.3V On/Off Power-CTL 3.3V On low/Off hi Pin 3 Output Pin 4 Pin 5 March 2009 LCD DV 42LG70...
  • Page 57 Main Board (Back Side Regulators) Voltages BACK SIDE OF MAIN BOARD IC102 STBY Label IC408 STBY Q803 STBY Label IC1003 STBY Function: EEPROM for HDMI HDCP Key Pin 1 BCM Receive Function: Controls Q804 +5V Switch Pin 1 Pins 1,2 Pin 2 0.1V Micom Receive...
  • Page 58 Set on or off X400 Only when set is on Micronas Crystal X200 780mVp/p 54Mhz X1000 Location X400 Location X200 Location Only when set is on Video Processor Use bottom MAIN Board (BCM) Crystal of L206 March 2009 LCD DV 42LG70...
  • Page 59 3.3V for the BCM chip IC100. If LD803 is illuminated GREEN, +3.3V is OK. Main Board LD803 Location MAIN Board Note: Only ½ of the dual LED is used. Circuit turning on LD803 shown on next slide March 2009 LCD DV 42LG70...
  • Page 60 42LG70 Main Board LD803 Circuit Diagram 42LG70 Main Board LD803 Circuit Diagram D3.3V_BCM A3.3V_BCM C828 C834 L806 L811 4.7uF 0.1uF C825 C803 C827 0.1uF 4.7uF 0.1uF IC809 R815 C833 C835 SBY5V 0.1uF 4.7uF L812 Q804 P800 LD803 IC802 3.3V C846...
  • Page 61 If you leave the shield on you can still access the same pins. Be careful not to accidentally ground out your test lead on the shield. (Note: This is a picture from a different model, but the concept is the same) March 2009 LCD DV 42LG70...
  • Page 62 USING SMTE COLOR BAR SIGNAL INPUT SDA/SCL Lines are only active when changing a channel (5V p/p) Pin 14 “SIF” Signal 850mVp/p 20nSec rate Pin 16 “Video” Signal 1Vp/p 20uSec rate Tuner Location MAIN Board March 2009 LCD DV 42LG70...

  • Page 63: Main Board Lvds P1000 Output Check

    This signal is using standard SMTE Color Bar output from a generator as the input source. P1000 Location Pin 11 500us Main Board LD803 Location This is just a sample Pin 16 of two pins on the LVDS. 500us There are 24 pins on P1000 carrying video. March 2009 LCD DV 42LG70...

  • Page 64: Main Board Lvds P1001 Output Check

    This signal is using standard SMTE Color Bar output from a generator as the input source. P1001 Location Pin 1 500us MAIN Board This is just a sample of Pin 15 two pins on the LVDS. There are 24 pins on 500us P1001 carrying video. March 2009 LCD DV 42LG70...

  • Page 65: Main Board Connector P800 Voltage And Diode Check

    2.86V AC-Det Open RL-ON 2.8V INV On/Off 3.2V 1.89V *PWM-VBRA 1.7V Open PWM-VBRB 1.4V Open 23-24 Open Pin 21 PWM-VBRA (ADIM) Is Fixed and is not used Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...

  • Page 66: P1000 Connector " Main Board " Voltage And Diode Check

    1.2V 1.1V 1.2V 1.4V 1.2V Video Signal Pins 1.1V 1.2V 1.3V 1.2V 1.2V 1.2V 1.2V 1.2V Diode Mode values taken 1.1V 1.2V 1.4V 1.2V with all Connectors Removed 1.1V 1.2V 1.4V 1.2V 3.3V Open AFLC-EN March 2009 LCD DV 42LG70...

  • Page 67: Main Board Connector P1001 Voltage And Diode Check

    1.3V 1.27V 1.3V 1.27V 1.1V 1.27V 1.3V 1.27V 1.1V 1.27V 1.3V 1.27V Pins identified in Bold Blue are used to send video content to the T-CON Board. Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...

  • Page 68: Main Board Connector P404 Voltage And Diode Check

    3.3V 3.3V 2.13V Key1 3.3V 3.3V 1.77V Key2 3.3V 3.3V 1.77V 3.3V 3.3V 0.55V 5V ST 1.48V Ready Open 3.9V 3.9V 1.24V EYEQ-Reset Open Ready Open Board-Buzz Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...

  • Page 69: Main Board Connector P501 Voltage And Diode Check

    Main Board Connector P501 Voltage and Diode Check P501 CONNECTOR "Main" to "Speakers" Diode Check 2.58V 2.58V 2.58V 2.58V Use speaker out to test for defective Audio Amp IC501 Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...

  • Page 70: Front Ir Board Section

    FRONT IR BOARD SECTION The Touch Sensitive Power Switch, Intelligent Sensor and IR Sensor are located on the front of this Board Light Diffuser for the Intelligent Sensor IR Sensor To Side Key Control Board To Main Board March 2009 LCD DV 42LG70...

  • Page 71: Front Board Assembly (Front View) Layout

    Front Board Assembly (Front View) Layout Front Board Assembly (Front View) Layout Sensor Close Up Light Diffuser for the Intelligent Sensor 3 Sensors POWER LED IR Sensor March 2009 LCD DV 42LG70...
  • Page 72 3.3V Open Key2 3.3V 3.3V Open 0.1V 0.1V 3.3V 3.3V Open 5.1V 5.1V 5V ST 1.8V Ready Open 3.9V 3.9V Open EYEQ-Reset Open Ready Open Board-Buzz Open Diode Mode values taken with all Connectors Removed March 2009 LCD DV 42LG70...
  • Page 73 SPEAKER SECTION Invisible Speaker System Overview SPEAKER SECTION Invisible Speaker System Overview The 42LG70 contains a : Progression Woofer combination in the progression of Elimination of the Main Speaker the Invisible Speaker system. conventional (Low Frequencies) First: The woofer shows the basic speaker.
  • Page 74 (to left) has sticky surface Terminals which adheres to front Spider bezel. Note, there is no Cone (Diaphragm), only voice coil. Dust Cap Frequency Pass with Capacitor adhesive Voice Coil Inside Mount Speaker Terminal Magnet March 2009 LCD DV 42LG70...

  • Page 75: Interconnect Diagram (11 X 17 Foldout Section)

    This Power Point shows a graphical representation of the 11 X 17 This Power Point shows a graphical representation of the 11 X 17 foldout page so clarity is limited. foldout page so clarity is limited. March 2009 LCD DV 42LG70...
  • Page 76 42LG70 INTERCONNECT DIAGRAM P201 Odd "SMPS" to P800 "Main PWB" P201 Even "SMPS" to P800 "Main PWB" Any Transformer on Ballast P204 "SMPS" to MCN1 "Ballast PWB" TO TFT MODULE Label STBY Diode Check Label STBY Diode Check Label STBY Diode Check 16.5V...
  • Page 77 REGULATORS/ICs ON FRONT IC405 STBY Label Q400 STBY Label Function: Micro Reset control Function: Reset to Micro Pins 1 3.3V Input 3.3VST-Micom 0.59V 0.59V Input from IC405 Pins 2 Hi-Lo to IC407 pin 4 Pins 3 Hi then Lo to Q400 IC803 STBY Q900...
  • Page 78 42LG70 LVDS P1000 WAVEFORMS 42LG70 P1000 LVDS CABLE WAVEFORMS: Waveforms taken using SMTP Color Bar input. All readings give the Scale 10mV and Time Base related to scope settings. Top waveform in each image gives a slower rate, 2us per division. Outlined area is shown in the bottom waveform at 500ns per division time base.
  • Page 79 42LG70 LVDS P1001 WAVEFORMS 42LG70 P1001 LVDS CABLE WAVEFORMS: Waveforms taken using SMTP Color Bar input. All readings give the Scale 10mV and Time Base related to scope settings. Top waveform in each image gives a slower rate, 2us per division. Outlined area is shown in the bottom waveform at 500ns per division time base.

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