Technical description and composition of the DEXP H32D7200K TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: H32D7200K / W
Chassis / Version: P75-3663SV6.1
Panel: LSC320AN10
LED backlight: JL.D32061235-083IS-F
T-CON: LSC320AN10-H02; AUO-11311, P30310, S302-1V, G301-1J, i7814HP
LED driver (backlight): integrated into MainBoard
PWM LED driver: 8pin
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: P75-3663SV6.1
Tuner: DVB + SAT
Technical Specifications H32D7200K / W
DEXP H32D7200K
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP H32D7200K TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
The malfunction in such cases should be sought in the elements of the power source - the line voltage converter (AC / DC), which is located on the MainBoard P75-3663SV6.1 main board. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (TO-252) and rectifier diodes for a probable short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often 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 responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
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 indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the P75-3663SV6.1 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 the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages at the terminals of the DVB + SAT tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using 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.
The appearance of the MainBoard P75-3663SV6.1 is shown in the figure below:P75-3663SV6.1
Main features of the DEXP H32D7200K device:
Installed matrix (LED-panel) LSC320AN10.
The matrix control uses the Timing Controller (T-CON) LSC320AN10-H02 ;.
To power the backlight LEDs, a converter is used, combined with the main board P75-3663SV6.1, controlled by an 8pin PWM controller. As power elements of the LED driver, keys of the TO-252 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits and TO-252 type power switches.
MainBoard - the main board (motherboard) is a P75-3663SV6.1 module.
The DVB + SAT tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LSC320AN10
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare
Glass Depth: 0.50 + 0.50 mm
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 20 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
DEXP H32D7200K / W TV with LSC320AN10 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 500,000: 1 is achieved by special control of LEDs depending on From the illuminated areas in the plot, the LCD panel uses direct pixel illumination with rear LEDs - Direct LED. You can view programs and movies and images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD R eady) Supported media file formats: MP3, MPEG4, HEVC (H.265), Xvid, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, audio x2, component, VGA, HDMI x3, USB x2. 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 65 watts.
Overall dimensions: with stand 732x476x207 mm, without stand 732x433x88 mm.
TV Weight: with stand: 3.7 kg, without stand: 3.5 kg.
Attention! The LSC320AN10 panel of a DEXP H32D7200K / W 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.
