Technical description and composition of the TCL L50E5800US TV, panel type and applicable modules. The composition of the modules.TCL LED
Model: L50E5800US
Chassis / Version: RT95L1
Panel: LWU500NDEL
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9976
MOSFET LED driver: F5N50NT
Power Supply (PSU): 40-LH9211-PWB1XG 81-LH921J1-PL290AA
PWM Power: FAN7930C (PFC), OB2283B
MOSFET Power: MDF18N50, 11N70
MainBoard: 40-RT95L1-MAB2HG
IC MainBoard: CPU: THGBMBG6D1KBAIL, EEPROM: BL24C32
Tuner: ST34WN-2T-E
Technical Specifications L50E5800US
TCL L50E5800US
General repair guidelines for TV LCD LED
Possible malfunctions
- The TCL L50E5800US TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
With such manifestations, the 40-LH9211-PWB1XG power supply module usually fails. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of power switches (MDF18N50, 11N70) and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN7930C (PFC), OB2283B, in the absence of visible damage or frank fault between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 40-RT95L1-MAB2HG 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: THGBMBG6D1KBAIL, EEPROM: BL24C32 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the ST34WN-2T-E tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners and users of the TCL L50E5800US TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC --------------------> 40-LH9211-PWB1XG (LH9211 / LH9222) Power supply
The appearance of the MainBoard 40-RT95L1-MAB2HG is shown in the figure below:40-RT95L1-MAB2HG
The appearance of the power supply
Main features of the TCL L50E5800US device:
Installed matrix (LED-panel) LWU500NDEL.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9976 PWM controller. As the power elements of the LED driver, keys of the F5N50NT type are used.
The necessary supply voltages for all nodes of the TCL L50E5800US TV are generated by the 40-LH9211-PWB1XG power supply module or its analogs using FAN7930C (PFC), OB2283B microcircuits, and MDF18N50, 11N70 type power switches.
MainBoard - the main board (motherboard) is a 40-RT95L1-MAB2HG module, using CPU chips: THGBMBG6D1KBAIL, EEPROM: BL24C32 and others.
The ST34WN-2T-E tuner provides television reception and channel tuning.
TCL L50E5800US TV with LWU500NDEL LCD display, diagonal size 50 "(127 cm) in 16: 9 format. The LED screen technology is implemented in the manufacturing technology of the screen of this TV model. You can watch movies in the highest possible quality UHD at a resolution of 3840x2160 pixels in 4K standard UHD - Supported media file formats: MP3, WMA, MPEG4, 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.
Overall dimensions: with stand 1235x758x284 mm, without stand 1235x717x59 mm.
TV Weight: 24.6 kg.
Attention! The LWU500NDEL panel of the TCL L50E5800US 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.