Technical description and composition of the DEXP H24C3000E TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: H24C3000E
Chassis / Version: CVMV29L-F
Panel: CX236DLEDM
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: AOD450
Power Supply (PSU): MP24S-CX
PWM Power: PWM SOT23-6
MainBoard: CVMV29L-F
IC MainBoard: CPU: TSUMV59XU, SPI FLASH: Winbond 25Q32
Tuner: CDT-3NP5i1-10
Technical Specifications H24C3000E
DEXP H24C3000E
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP H24C3000E TV does not turn on, the indicators on the front panel do not light or flash. The remote control does not respond to the control buttons.
With such manifestations, the MP24S-CX2 power supply module usually fails. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the 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, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
In most cases, the malfunction is caused by the lack of a backlight 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.
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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the CVMV29L-F 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). When repairing an MB board, you need to check its CPU components: TSUMV59XU, SPI FLASH: Winbond 25Q32. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If you suspect a malfunction of the CDT-3NP5i1-10 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 pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
It should be remembered! Attempts to independently repair the DEXP H24C3000E 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!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CVMV29L-F
FIRMWARE FOR SPI FLASH -----------> DEXP H24C3000E, Main: CVMV29L-F, Panel: CX236DLEDM
The appearance of the MainBoard CVMV29L-F is shown in the figure below:CVMV29L-F
CVMV29L-F can be used in TVs:
DEXP H24C3000E (Panel CX236DLEDM), DEXP H16B3000ED (Panel N156BGE-L21), DEXP F22B3000E (Panel T215HVN01.1 CX215LEDM), DEXP 16A3000 (Panel N156BGE-L2 1366x768 WXGA ), DEXP 19A3000 (Panel CX185LEDM), DEXP 22A7000 (Panel CX215LEDM), MYSTERY MTV-1628LW (Panel N156BGE-L21), MYSTERY MTV-1629LW (Panel N156BGE-L21), SUPRA STV-LC16741WL (Panel NT156WHM-N12), SUPRA STV-LC16740WL (Panel LTN156AT32).
The appearance of the power supply
Key Features of the DEXP H24C3000E:
Installed matrix (LED-panel) CX236DLEDM.
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 H24C3000E TV are generated by the MP24S-CX power module, or its analogs using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a CVMV29L-F module, using CPU chips: TSUMV59XU, SPI FLASH: Winbond 25Q32 and others.
The tuner CDT-3NP5i1-10 provides the reception of television programs and tuning to channels.
DEXP H24C3000E TV with a CX236DLEDM 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 models use an edge LED backlight panel - Edge LED. You can watch broadcasts and movies and images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). Supported media 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), VGA, HDMI, USB. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: with stand 560x360x170 mm, without stand 560x320x50 mm.
TV Weight: with stand: 3.53 kg, without stand: 3 kg.
Attention! The CX236DLEDM panel of a DEXP H24C3000E 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.