Technical description and composition of the MYSTERY MTV-4128LTA2 TV, panel type and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-4128LTA2
Chassis / Version: V3N08
Panel: LSC400HN01-G01
LED backlight: LED40D11-ZC14-03 (B), 30340011206
LED driver (backlight): integrated into PSU
PWM LED driver: OB2263, AP3616M28-G1
MOSFET LED driver: MDF0765
Power Supply (PSU): TV4205-ZC02-01 (C)
PWM Power: FAN7930 (PFC), OB2273
MOSFET Power: FDPF18N50, MDF0765
MainBoard: MSDV3224-ZC01-01
IC MainBoard: MSD308BT-SW, TPA3113D2, 25Q64BS, K4B1G1646G-BCKO, NT5CB128M16HP-D
Tuner: Tuner
Control: IR: IP2000-ZC12-01 (A) 30382000171
Technical Specifications MTV-4128LTA2
MYSTERY MTV-4128LTA2
General repair guidelines for TV LCD LED
Possible malfunctions
- MYSTERY MTV-4128LTA2 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.
With such manifestations, the power module usually fails. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (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.
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 microcircuits are usually checked by replacement 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.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the motherboard MSDV3224-ZC01-01 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). When repairing an MB board, you need to check its components MSD308BT-SW, TPA3113D2, 25Q64BS, K4B1G1646G-BCKO, NT5CB128M16HP-D. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If the TV works normally with external devices but does not tune into television channels, the Tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention to users! Self-repair of the MYSTERY MTV-4128LTA2 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> MYSTERY MTV-4128LTA2 V3N08, Main: MSDV3224-ZC01-01, Panel: LSC400HN01-G01
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TV4205-ZC02-01 Schematic diagram
To reduce the backlight current in LED drivers with the AP3616M28-G1 terminal stage, the total resistance of the resistors from terminal 22 (ISET AP3616M28) to the housing should be proportionally increased. The maximum current in each of the 16 channels is 75 mA. To increase the current in the diodes, the channels are connected in parallel. The current in milliamperes in each channel is determined from the calculation of 1560 * 1.194 / Rset, where Rset is the resistance from the ISET output to the housing in kilo-ohms.
Repair MainBoardThe appearance of the MainBoard MSDV3224-ZC01-01 is shown in the figure below:
MSDV3224-ZC01-01
MSDV3224-ZC01-01 can be used in TVs:
MYSTERY MTV-4029LTA2 (Panel V390HJ1-P02), MYSTERY MTV-4128LTA2 (Panel LSC400HN01-G01).
The appearance of the power supply
Main features of the MYSTERY MTV-4128LTA2 device:
Installed matrix (LED panel) LSC400HN01-G01.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB2263 PWM controller, AP3616M28-G1. As power elements of the LED driver, keys of the MDF0765 type are used.
The required supply voltages for all nodes of the MYSTERY MTV-4128LTA2 television are generated by the TV4205-ZC02-01 power supply module or its analogs using FAN7930 (PFC), OB2273 microchips and power switches of the FDPF18N50, MDF0765 type.
MainBoard - the main board (motherboard) is an MSDV3224-ZC01-01 module, using microcircuits MSD308BT-SW, TPA3113D2, 25Q64BS, K4B1G1646G-BCKO, NT5CB128M16HP-D and others.
The Tuner provides TV reception and channel tuning.
MYSTERY MTV-4128LTA2 TV with LSC400HN01-G01 LCD, 40 "(102 cm) diagonal size of 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 4000: 1. Edge LED backlighting is implemented in the LED-panel of this TV - Edge LED. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready).
The MTV-4128LTA2 is equipped with SMART software, embedded applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 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, audio x2, VGA, HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi. An output for connecting headphones is provided. 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, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The LSC400HN01-G01 panel of the MYSTERY MTV-4128LTA2 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.