This document is a service manual for Hisense LCD Televisions, specifically covering models with the chassis MSD308PX, including LTN24K26CEU, LHD32K26CEU(31), and LTDN46K26CEU. The manual, version 1.0, was released in March 2012 by Hisense Electric Co., Ltd. It provides essential information for servicing and maintaining these LCD televisions.
The manual begins with "Precautions and notices" to ensure safe and proper service. It emphasizes that only qualified personnel should perform service and repair, and that replacement parts must be specified by the manufacturer. It highlights the importance of using tools specifically designed for the purpose and warns against using unauthorized modification of the design. Critical safety characteristics are identified with a triangle symbol, and specific warnings are given for electrostatic discharges (ESD) to prevent damage to sensitive components. Technicians are advised to wear wristbands with resistance and to keep components and tools at the same potential. Other warnings include never replacing modules or components while the unit is switched on, using plastic rather than metal tools, preventing electrical shock by not using polarized AC plugs with an extension cord or receptacle that doesn't fully prevent blade exposure, and ensuring replacement parts meet the same characteristics as the original part. Safety regulations require that after a repair, the set must be returned to its original condition, and particular attention should be paid to the following points: the wire trees should be routed correctly and fixed with mounted cable clamps, and the insulation of the mains lead should be checked for external damage. It also warns against touching signal and power connectors while the product operates, not touching EMI ground parts and heat sinks of film filters, not supplying a voltage higher than specified, not using the product in locations where humidity is extremely high or where it may be splashed with water or flammable materials, and not pulling out or inserting the power cable from/to an outlet with wet hands. Further warnings include not damaging or modifying the power cable, and if the power cable is damaged or the connector is loose, not using the product. If the power connector or cable becomes dirty or dusty, it should be wiped with a dry cloth. The manual also advises against using only the cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the apparatus, and to use caution when moving the cart/apparatus combination to avoid injury from tip-over.
The "Notes on Safe Handling of the LCD panel and during service" section provides detailed instructions for ensuring safety and proper servicing. It recommends starting work when a sufficient working space is secured, and at all times other than when adjusting and checking the product, to turn off the power button and disconnect the power cable from the power source of the TV during servicing. To prevent electric shock and breakage of the PC board, servicing work should start at least 30 seconds after the main power has been turned off. If the main power is on, technicians should not touch any parts or circuits other than the ones specified. If any connection other than the one specified is made between the measuring equipment and the high voltage power supply block, it can result in electric shock or activation of the leakage-detection circuit breaker. When installing the LCD module, it should be removed from the packing carton, ensuring at least two persons perform the work. When the surface of the panel comes into contact with cushioning materials, it is important to confirm that there is no foreign matter on top of the cushioning materials before the surface of the panel comes into contact. Failure to observe this precaution may result in the surface of the panel being scratched by foreign matter. When handling the circuit board, static electricity from the body should be removed before handling. To handle the circuit board by holding the large parts such as the heat sink or transformer, failure to observe this precaution may result in the occurrence of an abnormality in the soldered areas. Technicians should not stack the circuit boards, as failure to observe this precaution may result in problems resulting from scratches on the parts, deformation of parts, and short-circuits due to residual electric charge. Routing of the wires and fixing them in position must be done in accordance with the original routing and fixing configuration when servicing is completed. All wires routed far away from the areas that become hot (such as the heat sink) must be fixed in position with wire clamps so that the wires do not move, thereby ensuring they are not damaged and their materials do not deteriorate over long periods of time. Finally, a safety check is required when servicing is completed to verify that the peripherals of the serviced points have not undergone any deterioration during servicing.
The technical specifications for the LTDN46K26CEU model are provided, including:
- Model: RL46L1004FTC
- Diagonal screen size: 46" (117 cm) LCD screen with LED backlight
- Screen resolution: 1920x1080 progressive Full HD
- Power: 100W
- Power consumption: AC~100-242B, 50/60Hz
- Color system: PAL, SECAM
- Sound system: B/G, D/K, I, L/L'
- Audio power: 8B+8B
- Stereo: NICAM/A2 stereo
- Antenna input: 1
- USB: 1
- Component input (YPbPr): 1
- Component modes: (480i/60Hz, 480p/60Hz, 576i/50Hz, 576p/50Hz, 720p/50Hz, 720p/60Hz, 1080i/50Hz, 1080i/60Hz, 1080p/50Hz, 1080p/60Hz)
- VGA input (PC): 1
- VGA modes: (640X480, 800X600, 1024X768, 1280X1024 60Hz)
- HDMI input: 3
- HDMI modes: (480i, 480p, 720p, 1080i, 1080p 60Hz)(576i, 576p, 720p, 1080i, 1080p 50Hz) (640X480, 800X600, 1024X768)
- Digital audio output: 1 (optical)
- SCART: 1 (CVBS input/output, RGB input)
- AV input: 2xCVBS Video, Audio
- Headphone: 1
The main board for LHD32K26CEU(31) and LTDN46K26CEU is identified as 4862. The tuner has changed from FH1610 to TDTC-G901D. An image of the main board is provided, highlighting key components and connectors such as YPBPR, L R, LVDS out, Main IC (MSD308), Earphone, Optical, AVI, SCART, USB, Audio, VGA, and HDMI. A diagram of the rear cover shows the various input/output ports, including SCART, USB, Audio-VGA, HDMI 1, HDMI 2, Common Interface, Headphone, Optical, and Antenna 75Ω.
The manual details "Factory/Service OSD Menu and Adjustment" features. To enter the Factory OSD Menu using an RC (remote control):
- Press "M" button and enter factory mode (Note 1).
- Press "Menu" button and enter factory OSD menu.
- Press "C H+"/"CH-" button to select the function in menu, press "VOL+"/"VOL-" to enter the selected function menu. Press "VOL+"/"VOL-" button to adjust values in the menu.
- Press "M" button to exit factory mode in the factory OSD menu.
When TV is outgoing from factory, users cannot enter factory OSD menu with Factory Remote.
Note:
- In the "Factory Menu," item "Function"->"TOFAC", you can select "M" or "U", default is "U".
- M-Means you can enter factory mode with factory RC or user RC.
- U-Means you can enter factory mode only with user's RC.
- "M" is only used for factory production.
To enter with user's RC:
- Press "Menu" button and call up User OSD Menu.
- Select "Sound" -> "Balance" item.
- Press number key 1->9->6 ->9 in sequence when "Balance" item is focused. Note: If necessary, re-do number keys.
- Factory OSD appears.
To exit: Press the standby button, then AC turn off and restart the TV, which can exit factory OSD menu.
The Factory OSD Menu comprises Factory Menu and Design Menu. The Factory Menu includes options for White Balance, ADC Calibration, Function, Linit, Test Pattern, Version, Clear protectly, and Clear unprotectly. The Design Menu includes Picture Mode, Audio Mode, Picture Curve, Audio Curve, SSC Adjust, Saving Mode, Overscan, and Not Stand.
Software upgrading features are described, including upgrading with the ISP_TOOL and with a USB drive.
For ISP_TOOL upgrading:
- Hardware connecting: Update the software through a special tool (as following). Connect the Debug board to the TV using a VGA interface or the RS232 (4 pin), and the other USB port to the computer.
- Install the ISP_TOOL4.5.0.4: The software is upgraded by a burning tool- ISP_TOOL.exe. Find the folder where the ISP_TOOL4.5.0.4 lies in. There are three folders/files in this folder: DLPORTIO.dll, FTD2XX.DLL, and ISP_Tool4.5.0.4.exe. Double click the ISP_TOOL4.5.0.4 icon, and then a dialog window will show as below.
- Click the "Config" button, and then a dialog window will show as below. Draw on the front of "Use USB". Port Type setting is USB. Base Addr setting is 0x38C. ISP Slave Address choose 0x92. Serial Debug Slave Address choose 0xB2.
- Click the "Connect" button. If the following figure appears, it indicates that the ISP_TOOL has connected. If it appears "Can't Find the Device Type !!", it indicates that the ISP_TOOL has not connected. Please click the "DisCon" button and "Connect" button to connect.
- Click the "Read" button. Choose the correct update file.
- After the update file has been chosen successfully, click the "Auto" button and choose parameters as following.
- Click the "Run" button and wait for the update to end. If any error message appears, click "Dis Con" then "Connect", and click the "Run" button again until the following dialog window shows.
For USB upgrading:
- Copy the "*.BIN" file such as "MERGE.BIN" to the root directory of a USB disk.
- Insert the USB disk into the USB slot of the TV set.
- Press "Menu" button and call up User OSD Menu, choose "Channel"->"Software Update(USB)" item. (Note 1)
- Press "OK"; it will show a confirm message box. Press [◄] button to select "yes" in the confirm message box, to start automatic update.
- Then it will update the software automatically. Please don't power off during the updating process.
- After the software is successfully upgraded, TV SET will restart automatically.
Note:
- In some TV SET, "Software Update(USB)" item may be in "OPTION" menu.
- After updating, you must confirm the software version in the "Factory Menu" and you'd better do a "UnProtected Clear" in the "Factory Menu".
The "Circuit instruction" section provides block diagrams for power assignment and signal process.
The power assign and block diagram shows the following voltage rails and components:
- +5VSB, 3.3Vstb, standby
- VCC-A, TAS5707, AO4559, 12V, Panel
- +12V, 78D05, 5V, Tuner-FH2
- NB637, 5V M, MP1482, VDDC, MSD308
- 1117-2.5, 2.5V, N46
- 1084-3.3, 3.3V, EEPROM
- 1117A, HDMI
- 1084A, 1.8V, DDR,N41
- USB
The image and signal process block diagram illustrates the flow from various inputs to the panel. Inputs include:
- POWER SUPPLY UNIT
- SPEAKER(OUT) -> Amplyfier
- HDMI -> HDMI SIGNAL
- HDCP -> HDCP INFO
- DDR -> BUS(DATA,ADDRESS)
- FLASH -> BUS(DATA,ADDRESS)
- VGA INTERFACE
- VIDEO INPUT(YPbPr and CVBS,AUDIO IN)
These signals are processed by the MSD308PX chip. Outputs from the MSD308PX include:
- LVDS to Panel
- DIF
- VIF
- TS
- AUDIO OUT
- REMOTE INPUT SIGNAL
- I2C
Other components connected to the MSD308PX include:
- TUNER TDTC-G901D
- HS3611
- PCMCIA INTERFACE
- USB INPUT
- EARPHONE OUTPUT
- REMOTE CONTRAL INPUT
- EEPROM
- SCART(CVBS and RGB IN CVBS OUT,AUDIO IN/OUT)
The troubleshooting section covers various issues:
- Remote control does not work: Check remote control, try new batteries, replace RC, check IR receiver, change Led & IR board, change Led & IR cable, replace main board.
- Function Key buttons do not work: Check switches, check solder connections, replace Key BD, check Key BD cable, change Key B D, replace main board.
- TV won't Power On: Check if LED is light (Blue/Red), check Power Output, check Power Cord, try Power on by RC and Button, check signal Source, check Panel Bright, replace Main BD, replace Panel, replace Power BD.
- No sound: Check connecter, reconnect, check speaker wire, replace speaker wire, check speaker set, replace speaker set, replace main board, replace Power Supply Board.
- No picture on the screen for TV/VGA/HDMI input: Check Signal Source, make sure signal source is available, check connect, reconnect, check cable, replace cable, replace main board.
- No picture on the screen for YPbPr input: Check Source work or not, check Source Device, check connect, reconnect, check Wires (Green Blue, Red), replace wires, replace main board.
- No picture on the screen for Video input: Check Source work or not, check Signal Source, check connect, reconnect, check Cable/ Wires, replace Cable/Wires, replace main board.
The schematic circuit diagrams are provided for the following main boards:
- LHD32K26CEU(31)
- LTDN42K26CEU
- LTDN24K26CEU (RSAG7.820.4871)
The manual also includes an "Explode View" section, which typically contains diagrams showing the disassembled parts of the TV for easier identification during service.
The detailed schematics include:
- LTDN24K26CEU power board circuit: Shows the power supply section with various voltage regulators, filters, and control circuits.
- LHD32K26CEU(31) power board circuit: Similar to the above, but specific to the LHD32K26CEU(31) model.
- LTDN42K26CEU power board circuit: Power supply details for the LTDN42K26CEU model.
- LTDN24K26CEU main board circuit: This is a comprehensive schematic of the main board, including the MSD308PX chip, inverter connector, power supply for various sections (3.3V, 2.5V), PCMCIA, DDR, and other peripheral circuits. It also shows the MCU for standby control.
- MSD308PX main board circuit: This section details the core MSD308PX chip connections, including LVDS connector, IR&KEY PAD, EEPROM, HDCP, and various GPIOs. It also shows the boot loader SPI Flash.
- HDMI circuits (1, 2, 3, 4): Detailed schematics for the HDMI input sections, including signal lines, protection circuits, and associated components.
- SCART R, SCART CVBS_in, VGA, YPbPr, SPDIF, AV_in1, AV_in2, SCART_CVBS_out: Schematics for various audio and video input/output sections.
- Tuner circuit (DVB-T/C TUNER, FR AGC, ANT POWER, TUNER POWER, POWER FOR 070D TUNER): Details of the tuner section, including antenna input, AGC control, and power supply for the tuner.
- Mute Circuit, Headphone jack, Amplifier, Amplifier Mute, Headphone Mute, Woofer AMP: Schematics for the audio output and amplification sections.
- Power for USB, USB0 Input, USB1 Input, Shield: Details of the USB power supply and data input circuits.
The manual provides a comprehensive guide for technicians to diagnose, repair, and maintain Hisense LCD Televisions with the specified chassis and models.
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