Technical description and composition of the DEXP F49C7000C TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F49C7000C
Chassis / Version: TP.MS3463S.PC821
Panel: C490F16-E1-H
LED backlight: Direct LED
LED driver (backlight): integrated into PSU
Power Supply (PSU): integrated into MainBoard
PWM Power: PFC & PWM
MainBoard: TP.MS3463S.PC821
IC MainBoard: CPU: MSD3463GSA-U6, SPI Flash: GD25Q64, Audio: TPA3110LD2
Tuner: DVB + SAT
Technical Specifications F49C7000C
DEXP F49C7000C
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP F49C7000C does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In this case, first of all, it is necessary to check the operability of the main power source - the AC / DC network voltage converter, all of whose elements are located on the MainBoard TP.MS3463S.PC821 board. 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 in the secondary circuits of the converter, it can usually fail in short circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM PFC & PWM chips are usually checked by replacing with new, or obviously working.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. 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.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the TP.MS3463S.PC821 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). Board repair and replacement of CPU chips: MSD3463GSA-U6, SPI Flash: GD25Q64, Audio: TPA3110LD2 are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the DVB + SAT tuner 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.
We recommend the owners of the F49C7000C TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> DEXP F49C7000C, Main: TP.MS3463S.PC821, Panel: C490F16-E1-H
The appearance of MainBoard TP.MS3463S.PC821 is shown in the figure below:TP.MS3463S.PC821
Main features of the DEXP F49C7000C device:
The matrix (LED panel) C490F16-E1-H is installed.
To power the backlight LEDs, a converter is used, combined with a power supply.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PFC & PWM microcircuits.
MainBoard - the main board (motherboard) is a TP.MS3463S.PC821 module, using CPU chips: MSD3463GSA-U6, SPI Flash: GD25Q64, Audio: TPA3110LD2 and others.
The DVB + SAT tuner provides television reception and channel tuning.
Technical description
DEXP F49C7000C TV with C490F16-E1-H LCD, 49 "(124 cm) diagonal size of 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 3000: 1. The LCD panel uses direct pixel illumination with rear LEDs - Direct LED. Media: MP3, MPEG4, HEVC (H.265), Xvid, DivX, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by 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 x3, USB. 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 1094x685x223 mm, without stand 1094x639x79 mm.
TV mass: without stand: 10.6 kg.
Attention! The C490F16-E1-H panel of a DEXP F49C7000C 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