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LG 32LG40 Training Manual

32" class lcd hdtv w/ built-in dvd player
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Download this manual See also: Service Manual, Training Manual
TRAINING MANUAL
TRAINING MANUAL
32LG40
32LG40
Model : 32LG40 32" CLASS LCD HDTV
w/ BUILT-IN DVD PLAYER
(31.5" diagonal)
Direct View LCD
Direct View LCD
With built in DVD Player
With built in DVD Player
Original 08/12/2008
Updated 10/13/2010

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Summary of Contents for LG 32LG40

  • Page 1 TRAINING MANUAL TRAINING MANUAL 32LG40 32LG40 Model : 32LG40 32” CLASS LCD HDTV w/ BUILT-IN DVD PLAYER (31.5" diagonal) Direct View LCD Direct View LCD With built in DVD Player With built in DVD Player Original 08/12/2008 Updated 10/13/2010...
  • Page 2 Contact Information, Preliminary Matters, Specifications, LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages Section 2 Circuit Board Operation, Troubleshooting of : • Switch mode Power Supply • Main (Digital) Board • T-CON Board • Ballast Board LCD DV August 2008 32LG40...
  • Page 3 Overview of Topics to be Discussed Overview of Topics to be Discussed 32LG40 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 4: Important Safety Notice

    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 5: Regulatory Information

    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. LCD DV August 2008 32LG40...
  • Page 6 Screen Marks LG CS Academy http://ln.lge.com/ilearn http://136.166.4.200 LCD-DV: 32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80, 47LG90, 47LH85, 42LE5500, 47LE8500 PLASMA: 42PG20, 42PJ350, 42PQ20, 42PQ30, 50PG20, 50PJ350, 50PK250, 50PK750, 50PS80, 50PS60, 60PK750, 60PS11, 60PS60, 60PS80 Also available on the Plasma Page:...
  • Page 7 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… LCD DV August 2008 32LG40...
  • Page 8 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. LCD DV August 2008 32LG40...
  • Page 9 32LG40 Product Information 32LG40 Product Information Side View This section of the manual will discuss the specifications of the 32LG40 “Thin” LCD Direct View Display Panel. LCD DV August 2008 32LG40...
  • Page 10 • Side-loading Progressive Scan DVD Player • Super Multi-Format • 3x HDMI™ 1.3 • AV Mode (Cinema, Sports, Game) • Clear Voice • SimpLink™ Connectivity • Invisible Speaker System • Expert Mode • PC Input • Swivel Stand (Manual) LCD DV August 2008 32LG40...
  • Page 11 1365 (H) × 768 (V) Possible Frame Interlaced Rates: 2 Fields to make a Frame 24FPS 1080P Panel 1920 (H) x 1080 (V) 30FPS Progressive 60FPS Each Field is a Frame Think of sync as the Panels “Refresh Rate” LCD DV August 2008 32LG40...
  • Page 12 INVISIBLE SPEAKER SYSTEM LG’s 2008 line of TVs include a unique invisible speaker system, tuned by renowned audio expert, Mr. Mark Levinson. Speakers are embedded in strategic spots behind the front cabinet and use minute vibrations to turn the entire front bezel into the speaker system. The result is a clean, polished look, and enhanced audio by increasing the “sweet spot”...
  • Page 13 ENERGY STAR use as much as 60% less energy to perform these functions, while providing the same performance at the same price as less-efficient models. Less energy means you pay less on your energy bill. Draws less than 1 Watt in stand by. LCD DV August 2008 32LG40...
  • Page 14 Remote Control Remote Control BOTTOM PORTION p/n: MKJ40653818 TOP PORTION MUTE LCD DV August 2008 32LG40...
  • Page 15 Rear and Side Input Jacks Rear and Side Input Jacks Current Software Release 32LG40-UA-v03.12_080711_Download.epk RGB (PC) Audio Optical Audio RGB (PC) Side Input Jacks HDMI RS232 Service Only HDMI Audio Remote Composite Component Composite Y Pr/Pb Main Board Orientation LCD DV August 2008 32LG40...
  • Page 16 3) If Customer’s Menu appears, continue to hold until it disappears. 4) The Service Menu appears Note: Dependant upon the Software Version, a Password may be required to enter the Service Menu. If a password is required, enter 0000 LCD DV August 2008 32LG40...
  • Page 17 Do not remove AC power or the USB Flash Drive. restarted. Do not turn off Power, during the upgrade 8) When download is completed, you will see process. “COMPLETE”. 9) Your TV will be restarted automatically. LCD DV August 2008 32LG40...
  • Page 18 32LG40 Product Measurements 32LG40 Product Measurements LCD DV August 2008 32LG40...
  • Page 19 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. LCD DV August 2008 32LG40...
  • Page 20 The Stand does not need to be removed. Remove the 18 screws shown by arrows. 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. LCD DV August 2008 32LG40...
  • Page 21 Circuit Board Layout Circuit Board Layout Panel p/n EAJ41825601 T-CON p/n EAT56801301 Ballast p/n EAY56797501 LVDS Cables Side Side Controls Inputs Speaker rattle. Speakers Tighten screws at bottom of cabinet Tighten screws holding woofers LCD DV August 2008 32LG40...
  • Page 22 Invisible Speaker System Layout Invisible Speaker System Layout Woofers Tweeters Tweeters Speaker rattle. Tighten screws at bottom of cabinet Tighten screws holding woofers Bottom View of Woofer Ports Stand Removed LCD DV August 2008 32LG40...

  • Page 23: Power Supply

    SECTION P203 P201 To Main To Ballast Error WM-D1 Fixed Volts INV On/Off PWR-DIM POWER-ON On/Off ERROR 5.2V 5.2V 5.2V 5.2V 16.5V 16.5V F101 3.15A/250V 334V Actual F100 5A/250V Hot Ground AC IN AC IN LCD DV August 2008 32LG40...
  • Page 24 Board Drawing Board Drawing P201 To Main To Ballast P203 Error 16.5V 16.5V WM-D1 INV On/Off 5.2V 5.2V 5.2V 5.2V ERROR POWER-ON On/Off PWR-DIM fixedV F101 F100 3.15A/250V 5A/250V 334V Actual AC IN AC IN LCD DV August 2008 32LG40...
  • Page 25 Power Supply P201 Control Signals from Main Board P800 Power Supply P201 Control Signals from Main Board P800 LCD DV August 2008 32LG40...
  • Page 26 Confirm that the other low voltage power supplies are activated. Pins 1 and 2 (16V) Pins 5 and 6 (12V) Pin 18 (AC Detect) goes high Fuse F101 Check for 350V (Ballast Voltage) If any voltage missing, replace Power Supply. LCD DV August 2008 32LG40...
  • Page 27 If 300V present, check P203 for 24V on Pins 1~5. Check P203 Pin 12 for at least 3V (Inverter On/Off). If yes, confirm Connectors to backlight OK, if OK, then panel defective. Ballast will not run if either of the Backlight plugs are removed. LCD DV August 2008 32LG40...
  • Page 28 Power Supply Board Removal Power Supply Board Removal Disconnect P203, P201 and AC In Remove the 4 screws indicated in the red circles. LCD DV August 2008 32LG40...

  • Page 29: Wm-D1

    1.26V 5.05V 4.57V 5.2V 5.15V 5.15V 0.34V 5.2V 5.15V 5.15V 0.34V 5.2V 5.15V 5.15V 0.34V 5.2V 5.15V 5.15V 0.34V 11.8V 1.69V 11.8V 1.69V 16.5V 0.31V 16.5V 0.31V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...

  • Page 30: Error

    P203 "SMPS" to MCN1 "Ballast Board" Diode Label STBY Check 24.52V 0.33V 24.52V 0.33V 24.52V 0.33V 24.52V 0.33V 24.52V 0.33V 1.67V INV On-Off 3.45V PWM-DIM 3.40V ERROR Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 31 IC502 Audio Selector HDMI IC806 IC600 A3.3V HDMI Selector Ft Keys IC602 HDMI EDID IC402 Serial Port P401 Interface IC601 HDMI EDID Side Inputs To SPK P500 IC501 Audio Processor and Output 16V Pins 49~52 LCD DV August 2008 32LG40...
  • Page 32 +3.3V DDRO_VTT 1.29V 5,6,7 D2.6V_BCM 2.6V +5V_SUB 3.2V On/Off Control DDRO_VTT 1.29V IC803 +9V Regulator IC400 RESET GENERATOR TO IC401 3.3BCM (On Back) FUNCTION NAME STBY FUNCTION NAME STBY +12V D3.3V_BCM 3.4V Reset (Lo-Hi) 3.39V LCD DV August 2008 32LG40...
  • Page 33 Power_CTL_3.3V 3.4V Q400 RESET GENERATOR FOR MICRO IC407 FUNCTION NAME STBY Reset Reset 0.6V 0.6V IC809 D2.6V/A2.6V_BCM Regulator 3.3VVST_MICON FUNCTION NAME STBY 6,7,8,10 +5V_SUB 0.36V 4.98V On/Off Control Power_CTL_2.6V 3.41V 1,2,3,4,5 D2.6V_BCM 2.66V 14,15 11,18,19,20 LCD DV August 2008 32LG40...
  • Page 34 IC805 A1.2V BCM Reg EEPROM Silk Screen for Pin 1 wrong IC805 TUNER TU800 IC801 1.8V Reg P904 IC102 HDCP IC403 NVRAM IC408 SIF Select IC702 DVD/BCM EEPROM P401 Side IC701 Side Inputs HDMI EDID P500 LCD DV August 2008 32LG40...
  • Page 35 FUNCTION NAME STBY 6,7,8,10 +5V_SUB 0.38V 12.36V On/Off Control Power_CTL_1.2V 3.41V On/Off Control Q900 6.16V 1,2,3,4,5 D1.2V_BCM 1.29V 5,6,7,8 LVDS 12V 12.36V 13, 14,15,16 11,12,18, 19,20 Screen Print for Pin No is incorrect, use IC LCD DV August 2008 32LG40...
  • Page 36 TP Use Crystal leg top or bottom 1.49V Main Board X200 X400 Location 660mVp/p 54Mhz 1.49V MAIN Board 1.49V Only when set is on Main Board X200 Location TP Use Crystal Side R232 or R233 LCD DV August 2008 32LG40...
  • Page 37 Pin 14 Audio SIF Pin 3 Tuner B+ (5V) 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. LCD DV August 2008 32LG40...
  • Page 38 Main Board Tuner Video and SIF Output Check Main Board Tuner Video and SIF Output Check Using SMTP Color Bar Input Pin 14 “SIF” Signal 850mVp/p Using SMTP Color Bar Input Pin 16 “Video” MAIN Signal Board 1Vp/p 20uSec rate Tuner Location LCD DV August 2008 32LG40...
  • Page 39 This signal is using standard SMTE Color Bar output from a generator as the input source. Remember there are actually 10 pins with LVDS signals. This only represents two Waveforms as an example. Pin 11 P902 Location MAIN Board Pin 16 LCD DV August 2008 32LG40...
  • Page 40 Connector P200. This is an open connection. (Software Upgrades) Remove the 2 screws securing the Side input decorative plastic piece on the right. Remove the 4 screws securing the Main Board indicated below in red. LCD DV August 2008 32LG40...
  • Page 41 5.15V 1.23V 11, 12 ST-5V 5.15V 1.23V 13, 14 15, 16 VBR-B 5V-MNT 3.3V AC-DET 4.57V RL-ON 2.86V 1.25V INV-On/Off 3.29V 2.15V 1.68V VBR-B 3.38V 2.15V 3.2V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 42 Back Side View LVDS 12V Panel Control from IC407 Pin 33 Q900 turns on Q901 LVDS Switch generating LVDS 12V All voltages are shown on the Interconnect Diagram LVDS Signal Waveforms Shown on back of Interconnect Diagram LCD DV August 2008 32LG40...
  • Page 43 1.2V 1.11V LVDS 1.05V 1.06V LVDS 1.1V 1.06V LVDS 1.09V 1.05V LVDS 1.08V 1.11V LVDS 1.13V 1.06V LVDS 1.06V 1.06V LVDS 1.14V 1.11V Size Sel 0.4V 3.07V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 44 3.4V 1.4V KEY4 3.4V 3.4V 1.4V KEY-1 3.4V 3.4V 1.4V KEY-2 3.4V 3.4V 1.4V ST-5V 0.53V PWM-LED 0.8V 4.1V 4.1V 2.3V LED-G 2.1V 0.8V LED-R 2.1V 0.8V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 45 3.3V DVD-SPDIF 3.38V 1.8V 0.83V 3.34V 3.3V DVD-MUTE DVD-L-In2 2.4V 0.8V 0.8V DVD-R-In2 2.4V 0.6V 0.83V *Pin 2: 3.3V With Disc Player and 0V No Disc Player Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 46 *Pin 1: 3.4V with No Disc and 0V with Disc inserted 5.01 0.45V P500 Connector "Main" to "Speakers" P200 Connector "Main" Software Download Label Diode Check Label Diode Check 8.14V 2.78V 8.14V 2.78V 8.15V 2.78V 8.15V 2.78V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 47 BALLAST SECTION (With Shield) LAYOUT BALLAST SECTION (With Shield) LAYOUT p/n EAY56797501 Ballast Start Det LED (LED1) MCN1 8A/125V Transformers To Backlight Left Side To Backlight Right Side LCD DV August 2008 32LG40...
  • Page 48 Ballast Board Assembly Layout Ballast Board Assembly Layout Ballast Start Det LED LED1 MCN1 8A/125V Transformers To Backlight To Backlight Right Side Left Side LCD DV August 2008 32LG40...
  • Page 49 Ballast Transformer Waveforms Ballast Transformer Waveforms 34V p/p 64.89kHz 22.2V p/p 220kHz T1/T2 Pin 1 T1/T2 Pin 6 Primary Warning, Side secondary is over 1.2Kv Transformers LCD DV August 2008 32LG40...
  • Page 50 Ballast Control Signals from Main Board P800 Ballast Control Signals from Main Board P800 LCD DV August 2008 32LG40...
  • Page 51 Signal Effects Signal Effects PWMDIM Waveform manipulates Just for the Burst Explanation, Triangle taken from a Oscillator in different the ballast chassis. drive IC. ADIM also manipulates the Burst Triangle Oscillator But it is not used. LCD DV August 2008 32LG40...
  • Page 52 Ballast Removal (Heat Sink and Insulators) p/n EAY56797501 Heat Transfer Material Be sure to replace “All” heat sink materials and insulators. Protects the Outputs Alignment Notch Insulator Shiny Side Down (Conductive) Cut Out Insulator Alignment Notch LCD DV August 2008 32LG40...
  • Page 53 Ballast Connector MCN1 Voltage and Diode Check MCN1 "Ballast" to P203 "SMPS" Label STBY Diode Check 24.52V 24.52V 24.52V 24.52V 24.52V Gnd_1 BVR_A 1.67V On/Off 3.45V VBR_B 3.40V Gnd_2 Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 54 CON (TFT DRIVE) Board Removal) CON (TFT DRIVE) Board Removal) Remove One Screw at the to of the Brace then Remove LVDS and three screws. Remove Screw Remove Screw Remove Screw CN1 LVDS To Main LCD DV August 2008 32LG40...
  • Page 55 Remember to put the three screws back in for ground purposes. To TFT Panel To TFT Panel 6.3V/1.5A 3) 0.0V CN1 LVDS 2) 1.8V Use the Connector P902 on Main 1) 3.3V Board for Voltages and Signal To Main Readings LCD DV August 2008 32LG40...
  • Page 56 The voltages developed by US1 are used on the T-CON and for the X and Y drivers inside the TFT panel. * The Voltages on CN2 and CN3 must be present for the panel to operate. LCD DV August 2008 32LG40...
  • Page 57 CAUTION: When removing LVDS Cables, be careful. Press the release Tabs to avoid damage to Board or to the Cable itself. Press in Press in LVDS Connectors Press in from the sides and lift out. LCD DV August 2008 32LG40...
  • Page 58 1.2V 0.88V LVDS 1.05V 0.88V LVDS 1.1V 0.88V LVDS 1.09V 0.88V LVDS 1.08V 0.88V LVDS 1.13V 0.88V LVDS 1.14V 0.88V LVDS 1.06V 0.88V Size Sel 0.4V 3.07V Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 59 The following section covers the Interconnection Voltages and The following section covers the Interconnection Voltages and Resistance checks between the DVD Player and the Main Resistance checks between the DVD Player and the Main Board. Board. LCD DV August 2008 32LG40...
  • Page 60 DVD Player Removal (1 of 2) DVD Player Removal (1 of 2) Remove the 8 Screws Holding the DVD Player in place Remove Tape LCD DV August 2008 32LG40...
  • Page 61 DVD Player Removal (2 of 2) DVD Player Removal (2 of 2) Disconnect CN400, CN401 and CN402 CN403 Not Used CN402 CN401 This screw hidden by tape in previous photo (Step2). CN400 LCD DV August 2008 32LG40...
  • Page 62 DVD Player Removed DVD Player Removed Set will work with DVD Player removed LCD DV August 2008 32LG40...
  • Page 63 NOTE: If the DVD Player fails, or if any Connector from the DVD Player is open, when selecting the DVD player as the input, it will show “No Signal” error. Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 64 12.3V 3.22V GP101 *3.4V *3.4V TXD1 0.7V 3.08V P3.3V 3.4V 3.37V 0.78V RXD1 0.7V 3.4V 1.2V *Pin 1: 3.4V with No Disc and 0V with Disc inserted Resistance taken in Diode Mode with Connectors Removed LCD DV August 2008 32LG40...
  • Page 65 Diode Mode checks between the Front Board and the and Diode Mode checks between the Front Board and the Main Board and the Front Board and the Side Key Board. Main Board and the Front Board and the Side Key Board. LCD DV August 2008 32LG40...
  • Page 66 Front Board Assembly Layout Front Board Assembly Layout 5V Zener 4.1V Zener To Main Board To Side Keys Board 3.4V Zener LCD DV August 2008 32LG40...
  • Page 67 Front Board Assembly Rear View Layout Front Board Assembly Rear View Layout POWER IR Receiver POWER BUTTON LCD DV August 2008 32LG40...
  • Page 68 KEY-1 3.4V 3.4V Key 3 3.41V 3.41V KEY-2 3.4V 3.4V Key 4 3.41V 3.41V ST-5V 2.7V PWM-LED 2.4V 4.1V 4.1V LED-G 2.1V 3.2V LED-R 2.1V 3.2V With all Connectors Removed, Resistance taken in Diode Mode. LCD DV August 2008 32LG40...
  • Page 69 P101 "Side Control" to J2 "Front Board" Label STBY Diode Check Key 1 3.4V 3.4V Key 2 3.41V 3.41V Key 3 3.41V 3.41V Key 4 3.41V 3.41V With all Connectors Removed, Resistance taken in Diode Mode. LCD DV August 2008 32LG40...
  • Page 70 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. LCD DV August 2008 32LG40...
  • Page 71 32LG40 INTERCONNECT DIAGRAM P203 "SMPS" to MCN1 "Ballast PWB" P201 Odd "SMPS" to P800 "Main PWB" P201 Even "SMPS" to P800 "Main PWB" Label STBY Diode Check TO TFT MODULE Label STBY Diode Check Label STBY Diode Check 24.52V 0.33V 16.5V...
  • Page 72 32LG40 LVDS P902 WAVEFORMS 32LG40 LVDS CABLE WAVEFORMS: Waveforms taken using SMTP Color Bar input. All readings give the Scale and Time Base related to scope settings. Top waveform in each image gives a slower rate. 10mV at 5uS per division.
  • Page 73 32LG40 32LG40 Direct View LCD This concludes the 32LG40 training session.