Technical description and composition of the TCL L65P1US TV, panel type and applicable modules. The composition of the modules.TCL LED
Model: L65P1US
Chassis / Version: MS68AD
Panel: LVU650CMOT E8 V1
LED driver (backlight): SHE7003A-101H
PWM LED driver: OZ9903GN
Power Supply (PSU): SHLD7001F-101H
MainBoard: 40-MS68AD-MAC2HG
IC MainBoard: CPU: MS6488, EMMC: 16GB, NAND: 4Gb, AUDIO: TAS5707
Tuner: MXL661 & ATBM7812B
Technical Specifications L65P1US
TCL L65P1US
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The TCL L65P1US TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, a malfunction is most likely to be detected in the SHLD7001F-101H power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, all other functions of the TV work. When turned on, the image may sometimes appear for a second.
As a rule, in this case, the LED backlight turns out to be faulty. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 40-MS68AD-MAC2HG motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MS6488, EMMC: 16GB, NAND: 4Gb, AUDIO: TAS5707 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the tuner MXL661 & ATBM7812B may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual / schematic diagram ------------------> Chassis MS68AD MainBoard 40-MS68AD-MAC2HG.rar.
The appearance of the MainBoard 40-MS68AD-MAC2HG is shown in the figure below:40-MS68AD-MAC2HG
The appearance of the power supply
Main features of the TCL L65P1US device:
Installed matrix (LED-panel) LVU650CMOT E8 V1.
The LED driver SHE7003A-101H is used to power the backlight LEDs, it is controlled by the OZ9903GN PWM controller.
The formation of the necessary supply voltages for all nodes of the TCL L65P1US TV is carried out by the SHLD7001F-101H power supply module, or its analogues.
MainBoard - the main board (motherboard) is a 40-MS68AD-MAC2HG module, using CPU chips: MS6488, EMMC: 16GB, NAND: 4Gb, AUDIO: TAS5707 and others.
The MXL661 & ATBM7812B tuner provides TV reception and channel tuning.
TCL L65P1US TV with an LVU650CMOT LCD display, diagonal size 65 "(165 cm) in 16: 9 format. LED TV backlighting is implemented in the technology for producing this TV model. You can watch movies in the highest possible quality UHD at a resolution of 3840x2160 pixels in 4K standard UHD.
The L65P1US is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 16 W (2x8 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI x2, USB x2, RS-232, Ethernet (RJ-45), Wi-Fi. An output for connecting headphones is provided.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Attention! The LVU650CMOT E8 V1 panel of the TCL L65P1US LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
