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LG 32LH30 Training Manual
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LG 32LH30 Training Manual

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32LH30 PRESENTATION
32LH30 PRESENTATION
Direct View LCD

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Summary of Contents for LG 32LH30

  • Page 1 32LH30 PRESENTATION 32LH30 PRESENTATION Direct View LCD...
  • Page 2 LCD Overview, General Troubleshooting Steps, Signal Distribution, Disassembly Instructions and Voltages Section 2 Circuit Board Operation, Troubleshooting of : • Switch mode Power Supply • Main Board • T-CON Board • Ft Control Board • Side Keys Spring 2009 LCD DV 32LH30...
  • Page 3 Overview of Topics to be Discussed Overview of Topics to be Discussed 32LH30 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 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 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. Spring 2009 LCD DV 32LH30...
  • Page 6 LG Web Training lge.webex.com LG CS Academy lgcsacademy.com http://136.166.4.200 LCD-DV: 32LG40, 32LH30, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 47LG90 PLASMA: 42PG20, 42PQ20, 42PQ30, 50PG20, 50PS80, 50PS60 Plasma Panel Also available on the Also available on the New Training Materials on...
  • 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… Spring 2009 LCD DV 32LH30...
  • 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. Spring 2009 LCD DV 32LH30...
  • Page 9 32LH30 Product Information 32LH30 Product Information This section of the manual will discuss the specifications of the 32LH30 LCD Direct View Display Panel. Spring 2009 LCD DV 32LH30...
  • Page 10 Two (2) HDMI™ (V.1.3 with Deep Color) • ISFccc Ready • Smart Energy Saving • LG SimpLink™ • LG Core Technologies (32-inch and above) • Dynamic Contrast Ratio 50,000:1 • Response Time 6ms • Brightness 500 cd/m2 • Viewing Angle 178º H / 178º V •...
  • Page 11 1365 (H) × 768 (V) Possible 2 Fields to make a Frame Frame Rates: Progressive 24FPS Each Field is a Frame 30FPS 1080P PANEL 60FPS 1920 (H) x 1080 (V) Think of sync as the Panels “Refresh Rate” Spring 2009 LCD DV 32LH30...
  • Page 12 Basic Specifications (LOGO Familiarization) Page 1 Basic Specifications (LOGO Familiarization) Page 1 Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. Spring 2009 LCD DV 32LH30...
  • Page 13 Remote Control Familiarization Remote Control Familiarization BOTTOM PORTION TOP PORTION Spring 2009 LCD DV 32LH30...
  • Page 14 “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 Spring 2009 LCD DV 32LH30...
  • Page 15 Rear and Side Input Jacks Rear and Side Input Jacks Rear Input Jacks USB Port for Software Upgrades Only Main PWB Rear Input Locations Spring 2009 LCD DV 32LH30...
  • Page 16 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. Spring 2009 LCD DV 32LH30...
  • Page 17 32LH30 PRODUCT DIMENSIONS 32LH30 PRODUCT DIMENSIONS 31-1/2" 3-1/8" Wattage 800mm 78.7mm AVG: 102W 7-7/8" STBY: >1W 200mm 2-3/8" 11-5/8" 60mm 296mm 3-15/16" 4-1/2" 100mm 114mm 23-1.8" 586.7mm Center Model No. 20-13/16" Serial No. 528.3mm Side Label 10 13/32" 264.3mm 12 11/16"...
  • Page 18 Disassembly: This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 32LH30 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 19 Remove the Stand by Pulling it out of its Retaining bracket. Remove Notice the plastic support bar hidden behind the stand. The back can now be removed. Spring 2009 LCD DV 32LH30...
  • Page 20 Remove the 23 screws indicated. 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 must be removed before removing the back. Spring 2009 LCD DV 32LH30...
  • Page 21 Circuit Board Layout T-CON Under Shield Ballast p/n: EAY60713901 T-CON p/n: EAT60666401 POWER SUPPLY LVDS Cable BALLAST Main PWB Side Key Backlight Connections Input Input Rear Inputs Speaker L Speaker R Master Ft IR/LED Control Power Switch Spring 2009 LCD DV 32LH30...
  • Page 22 Removal P203 P201 Disconnect P201, P201 P203, AC In SK100 and SK101. Remove the 4 screws indicated by the arrows. Do not have to be Press in released Two tabs to release lock SK101 SK100 Spring 2009 LCD DV 32LH30...
  • Page 23 Power Supply (Master Power Switch) Location If the TV won’t come on, be sure to check the Master Power Switch before assuming a failure has occurred. MASTER AC SWITCH LOCATION (Bottom Left Side viewed from rear) Spring 2009 LCD DV 32LH30...
  • Page 24 Power Supply (SMPS) PWB Layout To Ballast To Main P203 P201 Pin 1 Pin 2 F501 3.15A/250V Run 380V STBY 168V From Hot Gnd Hot Ground Shock Hazard Master Power Switch F100 SK101 5A/250V AC IN AC IN SK100 Spring 2009 LCD DV 32LH30...
  • Page 25 32LH30 POWER SUPPLY 32LH30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB TURN ON COMMANDS FROM MAIN PWB POWER SUPPLY (SMPS) Ballast Primary side fuse: Stand-By 90V Run 370V Regulator 24V B+ for the Ballast No AC AC In Bridge...
  • Page 26 32LH30 P700 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT 32LH30 P700 ON MAIN PWB TO SMPS P201 TURN ON CIRCUIT L708 3.3V-ST Q706 L728 R739 47KΩ R253 LVDS 12V Panel Power Q705 Q704 10KΩ 0.6V R740 47KΩ L715...
  • Page 27 (4.9V) to the Power Supply. Check P201 for 24V (Pins 17 or 18) and 12V (Pins 13 or 14). Confirm Pin 20 of P201 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. Spring 2009 LCD DV 32LH30...
  • Page 28 P201 (24V pins 17 and 18) (12V pins 13 and 14) and 24V to the Ballast P203 Pins 1~5. (2) Remove AC power. Reinsert the plug P203 to the Ballast. Use P700 Side to insert resistors Spring 2009 LCD DV 32LH30...
  • Page 29 Confirm the INV On/Off line P203 Pin 10 is going to 3V. REMOVE AC POWER: Use P700 d) Check the connections to the Backlights. DO NOT check these when AC Side to insert is applied as they carry 1.2Kv each. resistors Spring 2009 LCD DV 32LH30...
  • Page 30 PDIM Pin 24 can vary according to type of signal being processed and the OSD Backlight setting. 0.6V 0% to 3.3V 100%. Output from the video processor chip. Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 31 Diode Check 24.52V 0.729V 24.52V 0.729V 24.52V 0.729V 24.52V 0.729V 24.52V 0.729V VBR_A 1.67V Open On/Off 3.45V Open VBR_B 3.40V Open Error Open Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 32 2 in STBY and RUN with one lead on Neutral of SK101. With the Master Power Switch Closed (On) AC flows. Bottom Right of SMPS SK101 When Open (Off) AC open and does not flow. Neutral SK100 Live Spring 2009 LCD DV 32LH30...
  • Page 33 The Backlights are turned on with the “Inverter On” command arrives. INV-ON is sent from the Main board through the SMPS to the Ballast. The Backlights are manipulated by the control signal “P-DIM (Digital Dimming)” CN1 pin 13. Spring 2009 LCD DV 32LH30...
  • Page 34 One Continuity path One Continuity path 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 Spring 2009 LCD DV 32LH30...
  • Page 35 Introducing EEFL Introducing EEFL Simple structure, Low price Simple structure Low Cost Complicated structure Lamp manufacturing process Large number of Lamp Lamp assembly structure Drive by single inverter Spring 2009 LCD DV 32LH30...
  • Page 36 EEFL Compared to CCFL Electrodes 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 Spring 2009 LCD DV 32LH30...
  • Page 37 Ballast PWB Assembly (With Shield) Layout Ballast PWB Assembly (With Shield) Layout p/n EAY60713901 Ballast Start Det LED (LED1) 10A/125V Transformers To Backlight To Backlight Left Side Right Side Spring 2009 LCD DV 32LH30...
  • Page 38 Ballast PWB Assembly Layout Ballast PWB Assembly Layout Warning Do not Run the Ballast with Shield Removed. Ballast Start Det LED LED1 10A/125V Transformers To Backlight To Backlight Right Side Left Side Spring 2009 LCD DV 32LH30...
  • Page 39 FET Drivers Warning Do not Run the Ballast with Shield Removed. Primary Side Warning, secondary is over 1.2Kv Transformers 34V p/p 48kHz 22.2V p/p 48kHz T1 or T2 Pin 1 T1 or T2 Pin 6 Spring 2009 LCD DV 32LH30...
  • Page 40 32LH30 P700 on Main PWB To Power Supply P201 Out P203 To Ballast MCN1 32LH30 P700 on Main PWB To Power Supply P201 Out P203 To Ballast MCN1 P201 P700 P203 MAIN PWB IC100 Stby 5V 5V General Mstar BALLAST...
  • Page 41 Backlight Drive Signal Dimming Signal Effects Backlight Drive Signal Dimming Signal Effects PWMDIM manipulates the Burst Triangle Oscillator in the ballast drive IC. ADIM also manipulates the Burst Triangle Oscillator But it is not used. Spring 2009 LCD DV 32LH30...
  • Page 42 Ballast with Shield with Shield Removed. Removed. Heat Transfer Material Be sure to replace “All” heat sink p/n EAY60713901 materials and insulators. Protects the Output FETs Alignment Notch Insulator Cut Out Insulator Alignment Notch Spring 2009 LCD DV 32LH30...
  • Page 43 Diode Check 24.52V Open 24.52V Open 24.52V Open 24.52V Open 24.52V Open VBR_A 1.67V Open On/Off 3.45V Open VBR_B 3.40V Open Error Open Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 44 The 3.3V can also be measured at the ribbon connectors delivering signals to the TFT panel (CN3 pins 57, 58 or 59) and (CN4 pins 2, 3 or 4). Also at the Regulator US2 the 1.5V can be checked. Protected by Fuses FL1 and FL2. Spring 2009 LCD DV 32LH30...
  • Page 45 Remove the T-CON shield by sliding it left or right from under the vertical brace. Note: There are Chocolate (Heat Transfer) material pieces underneath the T-CON Heat sink. They dissipate heat from the UC1 and US3 ICs. Be sure to return these pieces when reinstalling the Heat Sink (Shield). Spring 2009 LCD DV 32LH30...
  • Page 46 Remember to reinstall the 3 screws for the Service Position if the T-CON board needs to be turned on for test purposes. These would already be removed when removing the shield. Disconnect CN3, CN4 and CN1. See next slide for details. Spring 2009 LCD DV 32LH30...
  • Page 47 Then the flex cable can be easily removed. Press in on the two tabs and slowly rock Unlocked the cable out of the connector. (Shown by the arrows in Fig 3) Fig 2 The locking tab is flipped upward Spring 2009 LCD DV 32LH30...
  • Page 48 CON (TFT Drive) PWB (Shield Removed) Components Identified CON (TFT Drive) PWB (Shield Removed) Components Identified To TFT Panel To TFT Panel T-CON p/n: EAT60666401 FL3/FL4 FL1/FL2 To Main PWB Remember to replace screws for ground purposes if testing the PWB. Spring 2009 LCD DV 32LH30...
  • Page 49 Fuses Black band 3.3V FL1 / FL2 indicates Cathode Cathode 3.3V Check 3.3V Fuses FL3 / FL4 Cathode Check Check Fuse F1 for 12V Fuse F1 (12V) from CN1 Pins 48, 49, 50, and 51. Spring 2009 LCD DV 32LH30...
  • Page 50 [ 0.14V ] FL3 / FL4 0.68V [ 0.14V ] Black band indicates Cathode Fuse F1 3.18V Cathode [ 0.57V ] Open Reading in brackets [ ] on TP [ 0.61V ] Reading without brackets on TP Spring 2009 LCD DV 32LH30...
  • Page 51 CON (TFT Drive) PWB Panel Voltage Development Checks Diode Check taken with meter in Diode Mode with all Connectors Removed -7.26V 25.7V 3.3V 15.5V -3.24V 19.7V 3.3V 24.3V 16.7V LVDS 7.4V 7.4V 7.4V 7.1V 16.9V LVDS LVDS Spring 2009 LCD DV 32LH30...
  • Page 52 CON (TFT Driver) Board CN3 and CN4 (Panel Voltage Checks) 16.9V 3.3V 16.9V 3.3V -7.26V 24.3V 16.9V 3.3V 3.3V 16.9V 24.3V -7.26V Pin 56 Pin 55 Pins 5,6 Pins 2,3 Pins 58,59 Pins 55, 56 Pin 6 Pin 5 T-CON PWB Spring 2009 LCD DV 32LH30...
  • Page 53 CON PWB LVDS Connector CN1 Pin Identification CON PWB LVDS Connector CN1 Pin Identification 10bit TA or 12V for Video Video Video Video 10bit TB T-CON Video Video Resolution TB Clock TA Clock Not used on T-CON Spring 2009 LCD DV 32LH30...
  • Page 54 32LH30 T-CON PWB LAYOUT 32LH30 T-CON PWB LAYOUT Warning: T-Con PWB under shield. Be sure to reinsert screws before operating set with shield removed. (24.3V) (16V) (3.3V) (3.3V) (16V) (24.3V) (-5V) (-5V) Pin 55 Pins 5,6 Pins 2,3 Pins 58,59...
  • Page 55 *Pin 8 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%) Customer’s Menu Backlight setting. But is Not Used by T-CON. (See arrow on the T-CON PWB CN1 indicating pin 1) Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 56 • Digital Audio Output Coaxial and Optical • ON OFF Controls to the SMPS turning on low voltage generation and Backlights • Backlight intensity control signal (Digital Dimming) P-DIM sent to the Ballast through the SMPS. Spring 2009 LCD DV 32LH30...
  • Page 57 P800 P700 NOTE: Be sure to check on top and behind the Video Processor IC. Look for a piece of Chocolate (Heat Transfer Material). Be sure to transfer to new PWB if present. P1204 Spring 2009 LCD DV 32LH30...
  • Page 58 P800 to T-CON PWB Q706 P800 P700 SMPS LD1000 SW100 Tuner OK Reset when LD1000 X1005 Q702 IC100 Green Microprocessor Video Processor X100 Tuner Software TU1001 Upgrade via Jig To Speakers To Front PWB P600 P1204 Assembly Spring 2009 LCD DV 32LH30...
  • Page 59 Voltages given on the 11X17 foldout “Interconnect Diagram” (Back View) (Back View) Q104 Q102 Q705 IC1003 Q704 Q103 Q703 Q701 IC1002 IC601 IC102 Q107 IC503 IC702 Q1000 D500 IC104 IC103 Q1001 D503 IC1201 Q600 D502 D501 IC1200 TUNER TU1001 D1223 IC501 IC500 Spring 2009 LCD DV 32LH30...
  • Page 60 Main PWB Component Identification Main PWB Component Identification IC705 Q706 IC704 IC105 IC1003 1.26V_VDDC IC1003 1 (5V) 3.3V-FE HDCP EEPROM Q706 Switch 5V-Tuner 2 (0.48V) 1 (0.78V) IC704 1-2 (Gnd) (12V LVDS) source L726 3 (0.48V) 2 (Gnd) 3.3V_FE 3 (5V) (5V General) 1 (12V) 4 (6V)
  • Page 61 Main PWB X100 and X1005 Check IC100 Microprocessor Crystal 2.28Vp/p 4.95Vp/p 12Mhz 25Mhz X100 1.62V Set on or off Only when set is on X400 1.58V 1.48V X1005 Location X100 Location 1.55V X1005 MAIN PWB Crystal for Tuner Controller IC1004 Spring 2009 LCD DV 32LH30...
  • Page 62 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. Main PWB LD1000 Location Spring 2009 LCD DV 32LH30...
  • Page 63 Main PWB Tuner with Shield Off (Pin ID) Main PWB Tuner with Shield Off (Pin ID) Spring 2009 LCD DV 32LH30...
  • Page 64 Pin 19 MAIN PWB “Video” Tuner Location Signal 2.24Vp/p Pin 12 and Pin 13 Pin 1 “Dig IF” Signal Pin 16 “SIF” Signal 700mVp/p Note: “Dig IF” Signal only when 450mVp/p receiving a Digital Channel. Spring 2009 LCD DV 32LH30...
  • Page 65 Main PWB Tuner Clock and Data Lines Main PWB Tuner Clock and Data Lines Note: Pin 8 SDA SCL and SDA only active during an actual Channel Change. 1V per/div 100uS 5V p/p Pin 9 SCL 1V per/div 100uS 5V p/p Spring 2009 LCD DV 32LH30...
  • Page 66 Pin 11 Pin 1, 2, 3, 4 (LVDS 12V) 500nS P800 Location MAIN PWB Pin 39 This is just a sample of two pins on the LVDS. 500nS There are 8 pins on P801 carrying video. Spring 2009 LCD DV 32LH30...
  • Page 67 PDIM Pin 24 can vary according to type of signal being processed, OSD Backlight setting. 0.6V 0% to 3.3V 100% and the Intelligent Sensor. Output from the video processor chip. Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 68 Main PWB LVDS Connector P800 Pin Identification Main PWB LVDS Connector P800 Pin Identification P800 12V for 10bit TA or Video Video Video Video T-CON 10bit TB Video Video Resolution Not used Clock Clock on T-CON Spring 2009 LCD DV 32LH30...
  • Page 69 1.2V 1.1V BIT-SEL 3.24V 1.1V *Pin 44 PWM-DIM 3.15V (Max 100%) to 0.6V (Min 0%) Customer’s Menu Backlight setting. But is Not Used by T-CON. (See arrow on the T-CON PWB CN1 indicating pin 1) Spring 2009 LCD DV 32LH30...
  • Page 70 3.3V 3.3V 1.4V Key2 3.3V 3.3V 1.1V 5V ST 5.1V 5.1V 1.5V 4.8V 4.8V Open 3.3V_ST 3.29V 3.29V 0.76V POWER On/Off 3.29V Open Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 71 Diode Check SPK-R(-) 12.4V 2.6V SPK-R(+) 12.4V 2.6V SPK-L(-) 12.4V 2.6V SPK-L(+) 12.4V 2.6V Use speaker out to test for defective Audio Amp IC600 Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 72 There are several Zener diodes on the board as well and since it receives STAND-BY 5V (STBY 5V) it could make the Power Supply or the Main board appear to be defective if a short was introduced to the stand by line. Spring 2009 LCD DV 32LH30...
  • Page 73 Front PWB Assembly (IR and Power LED) Layout (Front and Back Vie U2 LED driver To Main PWB To Side Key PWB Note: STBY5V is routed to this board. Possibility of a short. IR Sensor To Main PWB Power LEDs Spring 2009 LCD DV 32LH30...
  • Page 74 3.3V 3.3V Open Key2 3.3V 3.3V Open 5V ST 5.1V 5.1V 2.41V 4.8V 4.8V 2.5V 3.3V_ST 3.29V 3.29V Open POWER On/Off 3.29V 2.2V Diode Check taken with meter in Diode Mode with all Connectors Removed Spring 2009 LCD DV 32LH30...
  • Page 75 Side Key Assembly Side Key Assembly SW3001 SW3002 SW3003 SW3004 SW3005 SW3006 SW3007 SW3008 To Main PWB P3000 Spring 2009 LCD DV 32LH30...
  • Page 76 0.906V Volume (+) 0.906V Menu 1.65V CH (Dn) 1.65V Enter 2.24V CH (Up) 2.24V P3000 Connector “Side Key" to “IR/LED Control PWB“ P1 Label STBY Diode Check Key1 3.3V 3.3V Open Key2 3.3V 3.3V Open Spring 2009 LCD DV 32LH30...
  • Page 77 Main Power Switch Note Main Power Switch Note Pay attention to the Main Power Switch. Don’t forget to leave it in the On Position. Spring 2009 LCD DV 32LH30...
  • Page 78 This section shows the 11X17 foldout that ’ s available in the Paper This section shows the 11X17 foldout that ’ s available in the Paper and Adobe version of the Training Manual. and Adobe version of the Training Manual. Spring 2009 LCD DV 32LH30...
  • Page 79 32LH30 INTERCONNECT DIAGRAM Pins 1, 11, 18, 21, 26, 34, 37, 42~46 are all Ground CN1 CONNECTOR "T-CON” PWB CON PWB Pins 1~6 and 47 Are not used Pin ID STBY Run V Diode Test Pin ID STBY Run V...
  • Page 80 32LH30 32LH30 Direct View LCD This concludes the 32LH30 training presentation.