Technical description and composition of the DEXP H24B7000E TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: H24B7000E
Chassis / Version: CV512L-B
Panel: CX236LEDM
T-CON: V236BJ1-P01
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: AOD450
Power Supply (PSU): MP24S-CX rev1.0
PWM Power: PWM SOT23-6
MOSFET Power: TO-220
MainBoard: CV512L-B - 30-007
IC MainBoard: CPU: S2T512, Spi Flash: 25Q64FVSIG, Audio: YD1517P
Tuner: CDT-9NT372-RD60
Technical Specifications H24B7000E
DEXP H24B7000E
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP H24B7000E does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Often in such cases, the MP24S-CX power module is faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the power switches (TO-220) and rectifier diodes in the converters for a short circuit.
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.
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) PWM SOT23-6, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- 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.
Often in such cases, there is no LED backlight. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power (LED-driver).
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the CV512L-B 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: S2T512, Spi Flash: 25Q64FVSIG, 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 you need to check the power supply of the tuner CDT-9NT372-RD60 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention TV owners! Attempts at self-repair of the DEXP H24B7000E are not recommended by the manufacturer and can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> DEXP H24B7000E, Main: CV512L-B - 30-007, Panel: CX236LEDM
The appearance of the MainBoard CV512L-B is shown in the figure below:CV512L-B
CV512L-B can be used in TVs:
BBK 28LEM-1021/T2C (Panel SV275SHD HX010403 X41), BBK 22LEM-1026/FT2C (Panel M215HGE-P02), DEXP H24B7100E (Panel CX236LEDM (V236BJ1-P01)), DEXP F22B7000E/B (Panel CX215LEDM), ERISSON 22LEE31T2 (Panel CX215LEDM), RUBIN RB-22SE2FT2S (Panel 1080p Full HD 1920x1080), SUPRA STV-LC24T880WL (Panel HV236WHB-N00), SUPRA STV-LC22T880FL (Panel LC215DTBA).
The appearance of the power supply
Main features of the DEXP H24B7000E device:
Installed matrix (LED-panel) CX236LEDM.
The matrix control uses the Timing Controller (T-CON).
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 H24B7000E TV are generated by the MP24S-CX power module or its analogs using PWM SOT23-6 microcircuits and TO-220 type power switches.
MainBoard - the main board (motherboard) is a CV512L-B module, using CPU chips: S2T512, Spi Flash: 25Q64FVSIG, Audio: YD1517P and others.
The tuner CDT-9NT372-RD60 provides the reception of television programs and tuning to channels.
DEXP H24B7000E 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 3000: 1. In this The model uses a panel with the end position of the backlight LEDs - Edge LED. You can watch programs and movies and images in high quality HD with a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal is decoded into . Ogove systems PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p Supported multimedia file formats:. MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provides 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, 1360x768. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Mass of the TV: 3.53 kg.
Attention! The CX236LEDM panel of a DEXP H24B7000E 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.