Technical description and composition of the DNS 24AE7000 TV, panel type and modules used. The composition of the modules.DNS LED
Model: 24AE7000
Chassis / Version: T.EME380.61
Panel: CX240LEDM
T-CON: M240HTN01.2 CTRL BD
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: T.EME380.61
IC MainBoard: SPI FLASH - GD25Q64B, AUDIO: CD1517P
Tuner: NoName
Specifications 24AE7000
DNS 24AE7000
General recommendations for TV LCD LED repair
Possible manifestations of defects
- DNS 24AE7000 TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
Most likely in this case, the main switching power supply (SMPS) MP24S-CX is faulty. Its output voltages should be measured and, in their absence, the power switches and rectifier diodes should be checked for the probability of a short circuit in the converters.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) PWM SOT23-6 are usually checked by replacing them with new ones, or known to be working properly.
- There is no picture, there is sound, it reacts to the remote control, channels are switched In some cases, the image appears when turned on and disappears immediately.
In such cases, the most likely malfunction of the LED panel backlighting elements. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips for breakage 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 go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the T.EME380.61 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). When repairing the MB board, you need to check its components SPI FLASH - GD25Q64B, AUDIO: CD1517P. Defective elements should be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
Before replacing the NoName tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Users and owners of TVs should remember that attempts to repair the DNS 24AE7000 TV on their own without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> DNS 24AE7000, Main: T.EME380.61, Panel: CX240LEDM
The appearance of the MainBoard T.EME380.61 is shown in the figure below:T.EME380.61
External view of the power supply
Key features of the DNS 24AE7000:
Installed matrix (LED panel) CX240LEDM.
Matrix control uses Timing Controller (T-CON) M240HTN01. 2.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the OB3350CP PWM controller. The keys of the AOD450 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the DNS 24AE7000 TV is carried out by the MP24S-CX power module, or its analogs using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a T.EME380.61 module, using SPI FLASH chips - GD25Q64B, AUDIO: CD1517P and others.
Tuner NoName provides reception of television programs and tuning to channels.
DNS 24AE7000 TV with LCD CX240LEDM, diagonal 24 "(61 cm) in 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 1000: 1. the model uses a panel with an edge arrangement of backlight LEDs - Edge LED.
The CX240LEDM sensor and the MainBoard T.EME380.61 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and formation of a digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power of 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
An external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI, USB. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 1920x1080. The digital tuner is capable of receiving TV channels in DVB-T MPEG4, DVB-C standards.
The TV uses the MP24S-CX power supply.
TV weight: 3.57 kg.
Attention! The CX240LEDM panel of the DNS 24AE7000 LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.