Technical description and composition of the ERISSON 28LEC2000 TV, type of panel and applicable modules. The composition of the modules.ERISSON LED
Model: 28LEC2000
Chassis / Version: LS1B
Panel: M280X13-E1-H
LED backlight: L2830HD SVJ280A01
T-CON: MT3151A05-3-XC-1
LED driver (backlight): integrated into PSU
PWM LED driver: MP4012
Power Supply (PSU): R-HS055D-1MF XR7.820.247V1.2
PWM Power: PWM SOT23-6 (SG6848 or LD7535 or OB2273)
MOSFET Power: TF8N65
MainBoard: JUC7.820.00084054 LS1B
IC MainBoard: GD32Q64, F40-100GCP, H5TQ1G630FR, RT9108NB, MSB101A
Tuner: DT21WN-2A-E
Technical Specifications 28LEC2000
ERISSON 28LEC2000
General repair guidelines for TV LCD LED
Possible malfunctions
- The ERISSON 28LEC2000 TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In such cases, the XR7.820.247V1.2 power supply is usually faulty. It is necessary to measure its output voltages and, if they are absent, check the serviceability of power switches (TF8N65) and rectifier diodes in the converters for possible breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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 or LD7535 or OB2273) are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the JUC7.820.00084054 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements GD32Q64, F40-100GCP, H5TQ1G630FR, RT9108NB, MSB101A. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the tuner DT21WN-2A-E and update the software. The pulses from the I2C bus must be controlled with 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 LS1B is shown in the figure below:LS1B
JUC7.820.00084054 can be used in TVs:
BBK 40LEM-3080/FT2C (Panel ECG390AH-LD2 (SN)), BBK 32LEM-3081/T2C (Panel M320X13-E2-H), BBK 32LEM-1003/T2C (Panel M320X13-E4-L HD), DEXP 28A3000 (Panel R-HS055D-1MF), DEXP 50A7000 (Panel C500F13-E3-A), DNS C28DC2000 (Panel M280X13-E1-H), DNS C39DC2000 (Panel M390F13-E1-A), ERISSON 42LEC2000 (Panel M420F13-E1-L (G1)), ERISSON 55LEC2000 (Panel M550F13-E1-A 1080p Full HD), ERISSON 28LEC2000 (Panel M280X13-E1-H), RUBIN RB-32SD8T2C (Panel M320X13-E3-H), TELEFUNKEN TF-LED32S12T2 (Panel M320X12-E9-A(1)).
The appearance of the power supply
Main features of the ERISSON 28LEC2000 device:
Installed matrix (LED-panel) M280X13-E1-H.
The matrix control uses the Timing Controller (T-CON) MT3151A05-3-XC-1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MP4012 PWM controller.
The required supply voltages for all nodes of the TV ERISSON 28LEC2000 are generated by the power module R-HS055D-1MF, or its analogs using PWM SOT23-6 microcircuits (SG6848 or LD7535 or OB2273) and power switches of the TF8N65 type.
MainBoard - the main board (motherboard) is a JUC7.820.00084054 module, using microcircuits GD32Q64, F40-100GCP, H5TQ1G630FR, RT9108NB, MSB101A and others.
Tuner DT21WN-2A-E provides the reception of television programs and tuning to channels.
Trademark: ERISSON, Model: 28LEC2000.
Briefly from the TV: LCD, 720p HD, diagonal 28 "(71 cm), HDMI: 2, USB: 2, backlight type: Edge LED.
The composition uses MainBoard JUC7.820.00084054 LS1B and LCD-panel M280X13-E1-H.
Power Supply Unit (PSU) XR7.820.247V1.2 power Supply.
ERISSON 28LEC2000 TV with a M280X13-E1-H LCD, 28 "(71 cm) diagonal size in 16: 9 format. The LED panel of this TV has LED backlighting - Edge LED. You can view images in high quality HD with Resolution 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, JPEG. The stereo sound is realized by two built-in speakers, and NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), 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.
Overall dimensions: With a support 897x597x230 mm, Without a support 732x438x58 mm.
Attention! The M280X13-E1-H panel of an ERISSON 28LEC2000 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.