Technical description and composition of the DEXP H24B3000EE TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: H24B3000EE
Chassis / Version: TP.S512.PA63
Panel: CX236LEDM 705-2428-L9CCSY00-YH
LED backlight: 01 JL.CX240BF 320R0
LED driver (backlight): integrated into MainBoard
PWM LED driver: SN51DP
MOSFET LED driver: ME15N-10G
Power Supply (PSU): integrated into MainBoard
PWM Power: LD5530
MainBoard: TP.S512.PA63
IC MainBoard: S2T512, 25Q64, CD1517CP
Tuner: XF-3SDT-H (R840)
Control: IR: 200-GJR-LE32190-0H
Technical Specifications H24B3000EE
DEXP H24B3000EE
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP H24B3000EE TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In such cases, the common power source, the AC / DC converter of the mains voltage, which is combined with the elements of the main board TP.S512.PA63, is often faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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) LD5530, 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.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. 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 TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the TP.S512.PA63 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 - S2T512, 25Q64, CD1517CP with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner XF-3SDT-H (R840) may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Owners and users of the DEXP H24B3000EE TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main TP.S512.PA63
The appearance of MainBoard TP.S512.PA63 is shown in the figure below:TP.S512.PA63
TP.S512.PA63 can be used in TVs:
Aiwa 24le7021 .
Main features of the DEXP H24B3000EE device:
Installed matrix (LED panel) CX236LEDM 705-2428-L9CCSY00-YH.
To power the backlight LEDs, a converter is used, combined with the TP.S512.PA63 main board, controlled by the SN51DP PWM controller. As the power elements of the LED driver, keys of the type ME15N-10G are used.
The power module is combined with MainBoard and is made according to the flyback AC / DC voltage converter circuit using LD5530 microcircuits.
MainBoard - the main board (motherboard) is a TP.S512.PA63 module, using S2T512, 25Q64, CD1517CP chips, and others.
Tuner XF-3SDT-H (R840) provides the reception of television programs and tuning to channels.
DEXP H24B3000EE 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 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 log systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. 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), 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.
Overall dimensions: with a support 561x359x175 mm, without a support 561x333x44 mm.
TV Weight: with stand: 3.53 kg, without stand: 3.3 kg.
Attention! The CX236LEDM 705-2428-L9CCSY00-YH panel of a DEXP H24B3000EE 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.