Technical description and composition of the HYUNDAI H-LED28V22 TV, panel type and applicable modules. The composition of the modules.HYUNDAI LED
Model: H-LED28V22
Chassis / Version: JUC7.820.00081373
Panel: M280X13-E1-H
LED backlight: SVJ280A01_REV3_5LED_130402
T-CON: MT3151A05-1-XC-7
LED driver (backlight): integrated into PSU
PWM LED driver: PWM 8pin
MOSFET LED driver: AODD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251
MOSFET Power: MDF7N65B
MainBoard: JUC7.820.00081373
IC MainBoard: SPI Flash: EN25Q32
Tuner: R620D
Control: IR: JUC7.820.00081814
Technical Specifications H-LED28V22
HYUNDAI H-LED28V22
General repair guidelines for TV LCD LED
Possible malfunctions
- The HYUNDAI H-LED28V22 TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
First of all, in such cases, you should verify the operability of the common switching power supply (IIP) - AC / DC voltage converter of the mains voltage. All source elements in this TV model are located on the MainBoard JUC7.820.00081373 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 (MDF7N65B) and rectifier diodes of converters for possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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 NCP1251, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new ones, 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.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the JUC7.820.00081373 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its SPI Flash chips: EN25Q32 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the R620D 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.
The appearance of the MainBoard JUC7.820.00081373 is shown in the figure below:JUC7.820.00081373
JUC7.820.00081373 can be used in TVs:
AKAI LEA-32C25M (Panel M320X13-E1-H), ERISSON 32LEC2300 (Panel M320X13-E1-L), FUSION FLTV-28L32B (Panel M280X13-E1-H).
Main features of the HYUNDAI H-LED28V22 device:
Installed matrix (LED-panel) M280X13-E1-H.
The matrix control uses the Timing Controller (T-CON) MT3151A05-1-XC-7.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a PWM 8pin PWM controller. As power elements of the LED driver, keys of the type AODD4454 are used.
The power supply module is combined with the MainBoard and is designed according to a flyback AC / DC voltage converter using NCP1251 microcircuits and power switches of the MDF7N65B type.
MainBoard - the main board (motherboard) is a JUC7.820.00081373 module, using SPI Flash chips: EN25Q32 and others.
The R620D tuner provides TV reception and channel tuning.
HYUNDAI H-LED28V22 TV with an M280X13-E1-H LCD display, diagonal size 28 "(71 cm) in 16: 9 format. The required brightness of the screen is 250 cd / m² by LED backlighting. Contrast, as the ratio of maximum brightness to minimum , is 3000: 1. In the manufacturing technology of the screen of this TV model, LED LED backlighting is implemented. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in tax systems PAL, SECAM. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, 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, audio x2, component, VGA, HDMI x2, USB x2. 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.
Overall dimensions: with stand 640x443x165 mm, without stand 640x388x86 mm.
TV Weight: 4.8 kg.
Attention! The panel of the M280X13-E1-H LED-TV HYUNDAI H-LED28V22 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.