Technical description and composition of the DEXP F48D7000K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: F48D7000K
Chassis / Version: TP.MS3663S.PC821
Panel: LSC480HN08-8
LED backlight: JL.D48052235-083AL-F
T-CON: 15Y_L48GF11BMB7S4LV0.6
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 OB2273
MainBoard: TP.MS3663S.PC821
IC MainBoard: SPI Flash: MX25L6436F
Tuner: XF-3SET-HP
Technical Specifications F48D7000K
DEXP F48D7000K
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP F48D7000K TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the main power source - the AC / DC voltage converter, which is combined with the MainBoard TP.MS3663S.PC821 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 and rectifier diodes in the converters for a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TP.MS3663S.PC821 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - SPI Flash: MX25L6436F. In cases where the BGA processor is used, its malfunction is usually detected by local heating.
The malfunction of the XF-3SET-HP tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
FIRMWARE FOR SPI FLASH -----------> DEXP F48D7000K, Main: TP.MS3663S.PC821, Panel: LSC480HN08-8
The appearance of MainBoard TP.MS3663S.PC821 is shown in the figure below:TP.MS3663S.PC821
Main features of the DEXP F48D7000K device:
Installed matrix (LED-panel) LSC480HN08-8.
The matrix control uses the Timing Controller (T-CON) 15Y_L48GF11BMB7S4LV0.6.
To power the backlight LEDs, a converter is used, combined with the main board TP.MS3663S.PC821.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 OB2273 microcircuits.
MainBoard - the main board (motherboard) is a TP.MS3663S.PC821 module, using SPI Flash chips: MX25L6436F and others.
The XF-3SET-HP tuner provides TV reception and channel tuning.
A DEXP F48D7000K TV with an LSC480HN08-8 LCD, 48 "(122 cm) diagonal size in 16: 9 format. The required screen brightness of 280 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 4000: 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, MPEG4, HEVC (H.265), Xvid, MKV, JPEG.
The power of the sound system 20 W (2x10 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, component, VGA, HDMI x3, USB. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV working in the network mode is 138 watts.
Overall dimensions: with stand 1096x683x250 mm, without stand 1096x641x92 mm.
TV Weight: with stand: 12 kg, without stand: 11.7 kg.
Attention! The LSC480HN08-8 panel of a DEXP F48D7000K 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.
