Technical description and composition of the TCL L49P3CFS TV, panel type and applicable modules. The composition of the modules.TCL LED
Model: L49P3CFS
Chassis / Version: 40-MT56FP-MAB2HG
Panel: LVF485ND1L
LED backlight: 49P3C 49HR330M04A2 HR-17624-05008
LED driver (backlight): integrated into PSU
PWM LED driver: DIP-16
Power Supply (PSU): 40-L121W4-PWC1CG
MOSFET Power: N-FET TO-220
MainBoard: 40-MT56FP-MAB2HG
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: DVB-T2 & SAT
Technical Specifications L49P3CFS
TCL L49P3CFS
General repair guidelines for TV LCD LED
Possible malfunctions
- The TCL L49P3CFS TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Often in such cases, the 40-L121W4-PWC1CG power module is faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the power switches (N-FET TO-220) and rectifier diodes in the converters for a short circuit.
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 such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a malfunction, the zener diode PN junction will either be cut off or broken into short-circuit.
- 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-MT56FP-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 some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU, eMMC, DRAM, AUDIO, DC / DC with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV works properly from external devices, first of all, check the voltage of the DVB-T2 & SAT tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, remind users! Attempts to self-repair a TV TCL L49P3CFS without the appropriate qualifications and the necessary experience can lead to its complete failure to repair!
The appearance of the MainBoard 40-MT56FP-MAB2HG is shown in the figure below:40-MT56FP-MAB2HG
The appearance of the power supply
Main features of the TCL L49P3CFS device:
Installed matrix (LED panel) LVF485ND1L.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a DIP-16 PWM controller.
The necessary supply voltages for all nodes of the TCL L49P3CFS television are generated by the 40-L121W4-PWC1CG power module, or its analogs using power switches of the N-FET TO-220 type.
MainBoard - the main board (motherboard) is a 40-MT56FP-MAB2HG module, using CPU, eMMC, DRAM, AUDIO, DC / DC, and others.
The DVB-T2 & SAT tuner provides TV reception and channel tuning.
Brand: TCL, Model: L49P3CFS.
Briefly from the TV: LCD, LED backlight, 48.5 ", 1920x1080, 1080p Full HD, DVR, satellite tuner, sound: 16W, HDMI: 3, Internet access, Wi-Fi, Smart TV, curved screen.
Producer: LLC "M & K & D" Chernyakhovsk (Kaliningrad region), st. Sportivnaya, house 5. There is an assembly of Kaliningrad (TELEBALT plant) and Zelenograd (QUANT plant).
Developer: TCL Corporation. China
The composition uses MainBoard 40-MT56FP-MAB2HG and LCD-panel (matrix) LVF485ND1L.
Power Supply Unit (PSU) 40-L121W4-PWC1CG Power Supply.
TCL L49P3CFS TV with an LCD display, diagonal size 48.5 "(123 cm) in 16: 9 format. The brightness of the screen declared by the manufacturer is 280 cd / m² by LED backlighting. Contrast - the ratio of maximum brightness to minimum, is at least 4000: 1. Edge LED backlighting is realized in the LCD-panel of this TV - Edge LED.The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic layout according to the standard 1080p (Full HD).
The L49P3CFS TV has built-in SMART Software and pre-installed Linux Operating System. Connecting to the Internet can be done via Wi-Fi. Supported media file formats: MP3, MPEG4, Xvid, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, HDMI x3, USB, Ethernet (RJ-45), Wi-Fi.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: with stand 1096x701x239 mm, without stand 1096x667x102 mm.
TV Weight: with stand: 11.2 kg, without stand: 11 kg.
Attention! The panel of the TCL L49P3CFS 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.
