Technical description and composition of the DEXP F24B7000E TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F24B7000E / B
Chassis / Version: TE.S512.EA67
Panel: CX236LEDM
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: AOD450
Power Supply (PSU): MP24S-CX
PWM Power: OB2273 (PWM SOT23-6)
MOSFET Power: TO-220
MainBoard: TE.S512.EA67
IC MainBoard: SPI Flash GD25Q64, Audio: YD1517P
Tuner: Noname
Technical Specifications F24B7000E
DEXP F24B7000E
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP F24B7000E 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.
In such cases, the MP24S-CX power supply is usually faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (TO-220) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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 circuits (PWM) OB2273 (PWM SOT23-6) are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no 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 blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TE.S512.EA67 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 board (SSB), it may be necessary to replace the chips - SPI Flash GD25Q64, Audio: YD1517P 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 is working properly from external devices, first of all, check the supply voltage of the Noname tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the DEXP F24B7000E TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> DEXP F24B7000E/B, Main: TE.S512.EA67, Panel: CX236LEDM
The appearance of MainBoard TE.S512.EA67 is shown in the figure below:TE.S512.EA67
The appearance of the power supply
Main features of the DEXP F24B7000E device:
Installed matrix (LED-panel) CX236LEDM.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3350CP PWM controller. As power elements of the LED driver, keys of the AOD450 type are used.
The necessary supply voltages for all nodes of the DEXP F24B7000E TV are generated by the MP24S-CX power module or its analogs using OB2273 microcircuits (PWM SOT23-6) and TO-220 type power switches.
MainBoard - the main board (motherboard) is a TE.S512.EA67 module, using SPI Flash GD25Q64, Audio: YD1517P, and others.
The Noname tuner provides TV reception and channel tuning.
DEXP F24B7000E TV with a CX236LEDM LCD, 24 "(61 cm) diagonal size of 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 1000: 1. In this The model uses a panel with the end-face positioning of the backlight LEDs - Edge LED.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 6 W (2x3 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, audio x2, VGA, HDMI, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with a support of 560x360x260 mm, without a support of 560x300x57 mm.
TV mass: without stand: 3.2 kg.
Attention! The CX236LEDM panel of a DEXP F24B7000E 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.