Technical description and composition of the DEXP F24D7100E TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F24D7100E / W
Chassis / Version: CV512L-U24
Panel: M238HVN01.2
LED backlight: Edge LED
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3367A
MOSFET LED driver: MMBT3904
Power Supply (PSU): integrated into MainBoard
PWM Power: LD5535
MOSFET Power: 70R900P
MainBoard: CV512L-U24
IC MainBoard: CPU: S2T512, SPI Flash: 25Q64V, Audio: TDA3118E28
Tuner: CDT-9NT372-RD60
Technical Specifications F24D7100E
DEXP F24D7100E
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP F24D7100E TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In this case, the main power source - the AC / DC network voltage converter, the elements of which in this model are located on the MainBoard CV512L-U24 general board may turn out to be faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (70R900P) and rectifier diodes in the converters for a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) LD5535, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- 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 CV512L-U24 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 complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its CPU chips: S2T512, SPI Flash: GD25Q64C, Audio: TDA3118E28 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the tuner CDT-9NT372-RD60, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention TV owners! Attempts at self-repair of the DEXP F24D7100E are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main CV512L-U24
FIRMWARE FOR SPI FLASH -----------> DEXP F24D7100E/W, Main: CV512L-U24, Panel: M238HVN01.2
The appearance of the MainBoard CV512L-U24 is shown in the figure below:CultraView CV512L-U24
Main features of the DEXP F24D7100E device:
Installed matrix (LED-panel) M238HVN01.2.
To power the backlight LEDs, a converter is used, combined with the main board CV512L-U24, controlled by the BIT3367A PWM controller. As power elements of the LED driver, keys of the type MMBT3904 are used.
The power module is combined with the MainBoard and is made according to the scheme of a flyback AC / DC voltage converter using LD5535 microcircuits and power switches of the type 70R900P.
MainBoard - the main board (motherboard) is a CV512L-U24 module, using CPU chips: S2T512, SPI Flash: 25Q64V, Audio: TDA3118E28 and others.
The tuner CDT-9NT372-RD60 provides the reception of television programs and tuning to channels.
Technical description
A DEXP F24D7100E TV with an M238HVN01.2 LCD, 23.6 "(60 cm) diagonal size of 16: 9 format. The required screen brightness of 180 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.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD). Supported file formats mul Media: MP3, WMA, Xvid, DivX, 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), component, VGA, HDMI, 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.
The power consumed by the TV working in the network mode is 36 watts.
Overall dimensions: with stand 557x367x165 mm, without stand 557x340x78 mm.
TV Weight: with stand: 2.25 kg, without stand: 2.2 kg.
Attention! The M238HVN01.2 panel of a DEXP F24D7100E 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.