LG 26LH1DC1-UB Service Manual

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

LCD TV

SERVICE MANUAL

MODELS :

26LH1DC1-UB

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

Internal Use Only

Table of Contents

Troubleshooting

Summary of Contents for LG 26LH1DC1-UB

Page 1 Internal Use Only website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html LCD TV SERVICE MANUAL MODELS : 26LH1DC1-UB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Page 2: Table Of Contents
VIDEO AND AUDIO SIGNAL FLOW CHART .........34 WIRING DIAGRAM ..................46 EXPLODED VIEW..................47 EXPLODED VIEW PARTS LIST ..............48 REPLACEMENT PARTS LIST ..............49 SVC. SHEET ....................Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 3: Safety Precautions
When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 4 Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test. Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 5 3. Solder the connections. CAUTION : Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 6: Specification
Program Guide MINI-EPG Digital Noise Reduction Support Caption EIA608, EIA708 Channel Add/Delete Support Channel Preview Support Signal strength Display Support PPV&PRO : IDIOM Support Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 7 Static Ghost 0° (5.0usec) 90° 180° Doppler Ghost 0.2Hz (0.1 usec) 0.5Hz 1.0Hz 2.0Hz 5.0Hz Doppler Ghost 0.2Hz (0.2 usec) 0.5Hz 1.0Hz 2.0Hz 5.0Hz Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 8 @1kHz, -20dBFs AUDIO -LEFT mVrms -RIGHT MAX. LEVEL -LEFT Vrms -RIGHT SEPERATION -LEFT -RIGHT FREQ. @20Hz~20kHz RESPONSE -19.5 @ 0.5dB ~ -1.0dB -LEFT -RIGHT Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 9 SDTV, 480p 1280*720 74.25 HDTV, 720p 1280*720 44.96 59.94 74.18 HDTV, 720p 1920*1080 33.75 74.25 HDTV, 1080i 1920*1080 33.72 59.94 74.18 HDTV, 1080i Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 10 SDTV, 480p 1280*720 74.25 HDTV, 720p 1280*720 44.96 59.94 74.18 HDTV, 720p 1920*1080 33.75 74.25 HDTV, 1080i 1920*1080 33.72 59.94 74.18 HDTV, 1080i Copyright©2007 LG Electronics. Inc. All right reserved. -10- LGE Internal Use Only Only for training and service purposes...
Page 11: Adjustment Instruction
Panel Company ID turned On. Model ID When Reset, it is reset to 0. Reserved Commercial Flag Panel Brightness Epg Mode SW Upgrade EXIT Copyright©2007 LG Electronics. Inc. All right reserved. -11- LGE Internal Use Only Only for training and service purposes...
Page 12 Set Point Output DC Voltage(V) 0.210 0.345 0.520 0.715 0.945 1.215 1.530 1.850 2.200 2.630 3.170 Copyright©2007 LG Electronics. Inc. All right reserved. -12- LGE Internal Use Only Only for training and service purposes...
Page 13 → Ports, set the Port for the Connection group. 6) Check whether the Model of the Configuration group is set to SupraHD, and the Data type to Application. Copyright©2007 LG Electronics. Inc. All right reserved. -13- LGE Internal Use Only...
Page 14 1 for Stop bits, None for Flow control, and then click on “OK” button. Select the “.s19” file to download and click on “Open” button. (Check whether the TV is for lodging or Healthcare.) Copyright©2007 LG Electronics. Inc. All right reserved. -14- LGE Internal Use Only Only for training and service purposes...
Page 15 • Required equipment : PC, EEPROM Programmer(Ex : UprogHS 48 Potable), HDMI EDID Cable, RGB PC EDID Cable • S/W : Ex)Uprog.exe Copyright©2007 LG Electronics. Inc. All right reserved. -15- LGE Internal Use Only Only for training and service purposes...
Page 17 User programmable number, most significant byte - 1. UPN MSB-2 000~255 User programmable number, most significant byte - 2. UPN LSB 000~255 User programmable number, least significant byte. Copyright©2007 LG Electronics. Inc. All right reserved. -17- LGE Internal Use Only Only for training and service purposes...
Page 18 VIDEO MUTE EN 000~1 Set to 0 for normal, set to 1 for Blank. FACT DEFAULT 000~1 0=Normal. 1=Loads presets of all above settings. Copyright©2007 LG Electronics. Inc. All right reserved. -18- LGE Internal Use Only Only for training and service purposes...
Page 19 (Only RGB PC Input) Menu Language English Menu Transparency Semi Opaque Set ID Caption On/Off (Analog Mode) (Digital Mode) (Digital Font Option) Copyright©2007 LG Electronics. Inc. All right reserved. -19- LGE Internal Use Only Only for training and service purposes...
Page 20 FE Mode 0(Vsb) Upgrade Start EXIT (Enter) 6. Shipment Condition : Installer Menu – Setup (See 3. Commercial Interface Installer’s Menu Setting page.) Copyright©2007 LG Electronics. Inc. All right reserved. -20- LGE Internal Use Only Only for training and service purposes...
Page 21: Svc Remocon
To halt the main screen in the nomal mode. TIME SIZE MULTI PIP POSITION MODE TILT Shortcut keys To manually select the channel. Copyright©2007 LG Electronics. Inc. All right reserved. -21- LGE Internal Use Only Only for training and service purposes...
Page 22: Trouble Shooting Guides
Cable Check / Replace Replace is selected? Speaker Cable Check for problems Is the left/right audio Check / Replace in audio output normal? Normal operation Copyright©2007 LG Electronics. Inc. All right reserved. -22- LGE Internal Use Only Only for training and service purposes...
Page 23 Check the cold solder and short circuit of IC708(STA323W) when the audio does not work. For analog broadcasting, check the cold solder and short circuit of IC602(MSP3425) since it goes through this. Copyright©2007 LG Electronics. Inc. All right reserved. -23-...
Page 24: Trouble Shooting
Video normal on Video3? Check HC4051 Video normal on DIGITAL RF? Check TUNER Video normal on Check HC4051 AutoCamport/AV2 Check RJP Mode Copyright©2007 LG Electronics. Inc. All right reserved. -24- LGE Internal Use Only Only for training and service purposes...
Page 25 Replace Fuse(T5.0A H 250V) Is the Power Board connected to Connect cable each control Board? When ST-BY 12V/5V does not operate, replace Power Board. Copyright©2007 LG Electronics. Inc. All right reserved. -25- LGE Internal Use Only Only for training and service purposes...
Page 26 Audio normal on Video3? Check TEA6422D Audio normal on DIGITAL RF? Check TUNER Audio normal on Check TEA6422D AutoCamport/AV2 Check RJP Mode Copyright©2007 LG Electronics. Inc. All right reserved. -26- LGE Internal Use Only Only for training and service purposes...
Page 27: Block Diagram
18.432MHz IC602 IC602 IC601 IC601 MSP3425 MSP3425 Audio In TEA6422 TEA6422 12VA 12V ST12V ST5V Built-in Power Supply AC IN 100~240VAC 50/60Hz Copyright©2007 LG Electronics. Inc. All right reserved. -27- LGE Internal Use Only Only for training and service purposes...
Page 28 • POWER SUPPLY AC IN 100~240V DC +400V MAIN TRANS RECTIFIER +24V/4.5A (SCHOTTKY) (T801) A+12V/2.0A MAIN LINE CONTROL FILTER (IC802) +12V/2.5A FEED BACK (IC804) OPTO BRIDGE ACTIVE HIGH PWR ON/OFF COUPLER PWR-CTL (BD801) (Q803) (IC807) STAND-BY TRANS RECTIFIER ST +12V/1.25A (SCHOTTKY) (T901) 5V REGULATOR...
Page 29 • Power Tree LCD_24V 2.8 ~ 3.65A LCD Panel : 3.15A(INVERTER) AMP_12V 0.6 ~ 1.8A 12VA STA323W : 2A LCD_12V 0.5A LCD Panel : 450mA( Logic ) FDS4435 MSP3425 : 40mA, TEA6422 : 10mA 0.06A 55mA KA7809 MC33078 : 10mA 0.35A KA7805 MSP3425, 74HC4051, FMS6143, TS5V330D...
Page 30 • SupraHD-660 IC Block Diagram Note : The SupraHD-680 has an integrated CableCard controller, the SupraHD-660 does not. Copyright©2007 LG Electronics. Inc. All right reserved. -30- LGE Internal Use Only Only for training and service purposes...
Page 31 They add the functionality required to support OpenCable implementations. These devices include all of the functionality required to support the television implementations shown in the following system block diagrams. Copyright©2007 LG Electronics. Inc. All right reserved. -31- LGE Internal Use Only...
Page 32 Figure 3 shows a typical system implementation using the SupraHD-660/680. This system can be designed and manufactured in a very low-cost manner. Copyright©2007 LG Electronics. Inc. All right reserved. -32- LGE Internal Use Only Only for training and service purposes...
Page 33 3. I/O Options Figure 4 shows the four major I/O options available : • video input and output • audio input and output Copyright©2007 LG Electronics. Inc. All right reserved. -33- LGE Internal Use Only Only for training and service purposes...
Page 34: Video And Audio Signal Flow Chart
The TS data decrypted by IC901 is decoded by the video decoder of DTV controller of IC401 and converted to the LVDS signal. The LVDS signal is transferred to the LCD panel through the P503 connector to be displayed on the LCD panel. Copyright©2007 LG Electronics. Inc. All right reserved. -34- LGE Internal Use Only...
Page 35 P707). Also for the digital audio data in IC401, the PCM or AC3 compressed data by user setting is sent out in SPDIF format through P501. Copyright©2007 LG Electronics. Inc. All right reserved. -35- LGE Internal Use Only...
Page 36 This signal is amplified 2 times to send to the microprocessor(IC705), and IC705 arranges the caption signal to send the caption information to the DTV controller through the I C communications line. Copyright©2007 LG Electronics. Inc. All right reserved. -36- LGE Internal Use Only...
Page 37 This signal is converted to the stereo signal(L/R) in the digital audio amp(IC708) to be sent to the internal speaker through the audio output connector(P706, P707). Also the digital audio data in IC401 outputs the PCM data in SPDIF format through P501. Copyright©2007 LG Electronics. Inc. All right reserved. -37- LGE Internal Use Only...
Page 38 The signal received from IC107 is filtered and amplified 2 times to be received by the microprocessor. The microprocessor analyzes(caption slicing) this signal to send the caption information. Copyright©2007 LG Electronics. Inc. All right reserved. -38- LGE Internal Use Only...
Page 39 This signal is converted to stereo signal (L/R) in the digital audio amp(IC708) to send to the internal speaker through audio output connector(P706, P707). Also the digital audio data in IC401 is outputted as PCM data in SPDIF format through P501. Copyright©2007 LG Electronics. Inc. All right reserved. -39- LGE Internal Use Only...
Page 40 And the caption signal is send to IC401 through the video filter (IC107) and microprocessor(IC705) via analog video switch(IC706). The audio signal of S-Video is used as the audio signal of AV3. Copyright©2007 LG Electronics. Inc. All right reserved. -40- LGE Internal Use Only...
Page 41 Also because the caption information in the component signal received in IC202 is in Y signal, the Y signal is sent to the analog video switch of IC706 to be sent to IC401 through IC107 and IC705. Copyright©2007 LG Electronics. Inc. All right reserved. -41-...
Page 42 This signal is converted to stereo signal(L/R) by the digital audio amp(IC708) and sent to the internal speaker through the audio output connector(P706, P707). Also the digital audio data in IC401 is sent as output, PCM data, through P501 through SPDIF format. Copyright©2007 LG Electronics. Inc. All right reserved. -42- LGE Internal Use Only...
Page 43 (The 24 bit signal is composed is wired OR with the 24 bit component outputted by the IC201(AD converter).) The 24 bit signal received in DTV controller(IC401) is decoded and converted to LVDS to be sent to LCD panel through P503. Copyright©2007 LG Electronics. Inc. All right reserved. -43- LGE Internal Use Only...
Page 44 This signal is converted to stereo signal(L/R) by digital audio amp(IC708) and sent to the internal speaker through audio output connector(P706, P707). Also the digital audio data in IC401 is outputted as PCM data in SPDIF format through P501. Copyright©2007 LG Electronics. Inc. All right reserved. -44- LGE Internal Use Only...
Page 45 EDID information, but if the Set Top Box is the DVI transmitter, sometimes it outputs only the video signal unconditionally in set resolution.) The signal received through IC401 is shown in the display through the same process as above. Copyright©2007 LG Electronics. Inc. All right reserved. -45- LGE Internal Use Only...
Page 46: Wiring Diagram
WIRING DIAGRAM [26LH1DC1-UB] WIRING DIAGRAM FOR 26LH1DC1-UB...
Page 47: Exploded View
EXPLODED VIEW MODEL NO. : 26LH1DC1-UB...
Page 48: Exploded View Parts List
Cover_Side Jack+Plate_Side AV EBU39117501 30PX30P(300mm) LVDS Cable EBU39139001 Harness Assembly Acce EBU39139101 Installa tion&Setup Guide ssory EBU38690001 Hospital Power Cord_SJP_3P_1800mm MAY42732801 MFZ42732901 Packing Copyright©2007 LG Electronics. Inc. All right reserved. -48- LGE Internal Use Only Only for training and service purposes...
Page 72 P/NO : 3350GDKM0020A December, 2007...

LG 26LH1DC1-UB Service Manual

Quick Links

Troubleshooting

Related Manuals for LG 26LH1DC1-UB

Summary of Contents for LG 26LH1DC1-UB

Table of Contents