Technical description and composition of the DEXP F55D8000K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: F55D8000K
Chassis / Version: 35023016
Panel: HV550FHB-N20
LED backlight: MX55D12L / R-ZC21FG-01 303MX550040, 303MX550041
T-CON: 47-6021023 HV550WU2-370
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: 35023016
Tuner: DVB-T2 & SAT
Control: IR: MX-50N06-IR
Technical Specifications F55D8000K
DEXP F55D8000K
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The DEXP F55D8000K TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light up and do not blink.
First of all, in such cases, you should verify the operability of the common switching power supply (IIP) - AC / DC voltage converter of the mains voltage. All source elements in this TV model are located on the MainBoard 35023016 main board. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the working condition of the power switches and rectifier diodes for a possible breakdown (short circuit).
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event 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 microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- 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 35023016 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software).
If you suspect a malfunction of the DVB-T2 & SAT tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention TV owners! Attempts to self-repair DEXP F55D8000K are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard 35023016 is shown in the figure below:35023016
Main features of the DEXP F55D8000K device:
Installed matrix (LED-panel) HV550FHB-N20.
The matrix control uses the Timing Controller (T-CON) 47-6021023.
To power the backlight LEDs, a converter is used, combined with the main board 35023016.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is a module 35023016.
The DVB-T2 & SAT tuner allows you to receive television programs and tune to channels.
A DEXP F55D8000K TV with an LCD display, diagonal size 54.6 "(139 cm) in 16: 9 format. The required brightness of the screen is 220 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1200: 1. There are TV options include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition standard 1080p (Full HD).
F55D8000K has built-in SMART Software and pre-installed Android Operating System. Connecting to the Internet can be done via Wi-Fi. Supported media file formats: MP3, MPEG4, HEVC (H.265), MKV, JPEG.
The power of the sound system 10 W (2x5 W) provide 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, component, VGA, HDMI x3, USB x2, 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.
The power consumed by the TV working in the network mode is 138 watts.
Overall dimensions: with stand 1251x772x288 mm, without stand 1251x730x92 mm.
TV Weight: with stand: 13.9 kg, without stand: 13.7 kg.
Attention! The DEXP F55D8000K LED TV panel 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.