Technical description and composition of the MYSTERY MTV-4231LTA2 TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-4231LTA2
Chassis / Version: MSA6284-ZC01-01
Panel: V420HJ2-P01
T-CON: V420HJ2-XR01
LED driver (backlight): integrated into PSU
PWM LED driver: OCP8128
MOSFET LED driver: 60R360Q
Power Supply (PSU): TV5502-ZC02-01 303C5502063
PWM Power: TEA1716, SY8113B
MOSFET Power: 13NM60 (PFC), BYC8X-600P (8A 600V)
MainBoard: MSA6284-ZC01-01
IC MainBoard: CPU: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0
Tuner: MSB102KT
Control: WiFi: IP2000-ZC12-01 (A) 30382000171 L3721E2A1
Technical Specifications MTV-4231LTA2
MYSTERY MTV-4231LTA2
General repair guidelines for TV LCD LED
Possible malfunctions
- The MYSTERY MTV-4231LTA2 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.
With such manifestations, a malfunction is most likely to be detected in the TV5502-ZC02-01 power supply module. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (13NM60 (PFC), BYC8X-600P (8A 600V)) and rectifier diodes of the converters for a short circuit probability.
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 TEA1716, SY8113B, in the absence of visible damage or frank fault 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, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
As a rule, in such cases there is no display backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the motherboard MSA6284-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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0. 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 you need to check the voltage of the tuner MSB102KT and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
TV users and owners need to remember that attempts to self-repair a MYSTERY MTV-4231LTA2 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TV5502-ZC02-01 Power supply
The appearance of the MainBoard MSA6284-ZC01-01 is shown in the figure below:MSA6284-ZC01-01
MSA6284-ZC01-01 can be used in TVs:
MYSTERY MTV-4331LTA2 (Panel FullHD_CMO216_H1L01), TELEFUNKEN TF-LED48S39T2S (Panel LCS480HN08-8).
The appearance of the power supply
Main features of the MYSTERY MTV-4231LTA2 device:
Installed matrix (LED panel) V420HJ2-P01.
The matrix control uses the Timing Controller (T-CON) V420HJ2-XR01.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OCP8128 PWM controller. As power elements of the LED driver, keys of the 60R360Q type are used.
The necessary supply voltages for all nodes of the MYSTERY MTV-4231LTA2 television are generated by the TV5502-ZC02-01 power supply module or its analogs using TEA1716, SY8113B microcircuits and 13NM60 (PFC), BYC8X-600P (8A 600V) power switches.
MainBoard - the main board (motherboard) is an MSA6284-ZC01-01 module, using CPU chips: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0 and others.
The MSB102KT tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V420HJ2-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 919.296x517.104 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.9% (with Polarizer)
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
MYSTERY MTV-4231LTA2 TV with V420HJ2-P01 LCD, 42 "(107 cm) diagonal size of 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 5000: 1. LED TV backlighting is implemented in the technology of manufacturing the screen of this TV model. 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 graphical decomposition according to the standard 1080p (Full HD )
MTV-4231LTA2 TV has built-in SMART Software and pre-installed Android Operating System. 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, MKV, JPEG.
The power of the sound system 16 W (2x8 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, component, VGA, HDMI x3, USB x3, 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, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Attention! The V420HJ2-P01 panel of the MYSTERY MTV-4231LTA2 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.