Technical description and composition of the HYUNDAI H-LED24F402BS2 TV, panel type and applicable modules. The composition of the modules.HYUNDAI LED
Model: H-LED24F402BS2
Chassis / Version: JUC7.820.00195357
Panel: C240F15-E8-A (G81)
LED backlight: 25V 350mA
T-CON: M238HVN01.2
LED driver (backlight): integrated into MainBoard
PWM LED driver: 7911B
MOSFET LED driver: ME15N10-G
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 SG6848
MOSFET Power: MMIS70R900P
MainBoard: JUC7.820.00195357 (HLS80JS2017-7-10)
IC MainBoard: SPI Flash: 25Q64
Tuner: T18WM-2K-E & SAT
Technical Specifications H-LED24F402BS2
HYUNDAI H-LED24F402BS2
General repair guidelines for TV LCD LED
Possible malfunctions
- HYUNDAI H-LED24F402BS2 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
The malfunction in such cases should be sought in the elements of the power source - the network voltage converter (AC / DC), which is located on the MainBoard JUC7.820.00195357 main board. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches (MMIS70R900P) and rectifier diodes of converters for possible short circuit.
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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips PWM SOT23-6 SG6848 are usually checked by replacing with new, or obviously working.
- 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.
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.
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 TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the JUC7.820.00195357 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). Board repair and replacement of SPI Flash chips: 25Q64 are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If you suspect that the T18WM-2K-E & SAT tuner is malfunctioning, first of all, you need to make sure the software is correct, as well as the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
TV users and owners must remember that attempts to self-repair a HYUNDAI H-LED24F402BS2 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Repair MainBoardThe appearance of the MainBoard JUC7.820.00195357 is shown in the figure below:
JUC7.820.00195357
Main features of the HYUNDAI H-LED24F402BS2 device:
Installed matrix (LED-panel) C240F15-E8-A (G81).
The matrix control uses the Timing Controller (T-CON) M238HVN01.2.
To power the backlight LEDs, a converter is used, combined with the main board JUC7.820.00195357, controlled by a 7911B PWM controller. As power elements of the LED driver, keys of the type ME15N10-G 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 SG6848 microcircuits and power switches of the type MMIS70R900P.
MainBoard - the main board (motherboard) is a JUC7.820.00195357 module, using SPI Flash chips: 25Q64 and others.
The T18WM-2K-E & SAT tuner provides television reception and channel tuning.
HYUNDAI H-LED24F402BS2 TV with C240F15-E8-A LCD, 23.6 "(60 cm) diagonal of 16: 9 aspect ratio. The required screen brightness of 200 cd / m² is provided by LED backlighting. Contrast as the ratio of maximum brightness to minimum , is 3000: 1. Direct LED backlighting with direct LEDs is realized in the LCD panel of the TV. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The power of the sound system 4 W (2x2 W) provide 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, 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.
Overall dimensions: with stand 556x374x157 mm, without stand 556x336x97 mm.
The mass of the TV: 2.5 kg.
Attention! The HYUNDAI H-LED24F402BS2 LED TV panel C240F15-E8-A (G81) 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.