Technical description and composition of the MYSTERY MTV-4028LT2 TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-4028LT2
Panel: V390HJ1-P02
T-CON: V390HJ1-XC01; CM2801B, CM501
LED driver (backlight): integrated into PSU
PWM LED driver: OB2263, AP3616M28-G1
MOSFET LED driver: MDF0765
Power Supply (PSU): TV4205-ZC02-01
PWM Power: FAN7930 (PFC), OB2273
MOSFET Power: FDPF18N50
MainBoard: MSDV3223-ZC01-01
IC MainBoard: 25Q64-104HIP; K4B1G1646G-BCKO
Tuner: NoName
Control: IR: T3210-ZC25-03 (B)
Technical Specifications MTV-4028LT2
MYSTERY MTV-4028LT2
General repair guidelines for TV LCD LED
Possible malfunctions
- The MYSTERY MTV-4028LT2 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 malfunction should be sought first in the TV4205-ZC02-01 power supply module. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (FDPF18N50) and rectifier diodes in the converters for a short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
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 FAN7930 (PFC), OB2273, 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, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The most likely in these cases is a malfunction of the LED 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 check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard MSDV3223-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). If it is not possible to replace the MB (SSB) board, you must check the health of its elements - 25Q64-104HIP; K4B1G1646G-BCKO. Defective components should be replaced.
In cases where there is no tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the outputs of the NoName tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using 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.
FIRMWARE FOR SPI FLASH -----------> MYSTERY MTV-4028LT2 , Main: MSDV3223-ZC01-01, Panel: V390HJ1-P02
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 MSDV3223-ZC01-01 is shown in the figure below:
MSDV3223-ZC01-01
MSDV3223-ZC01-01 can be used in TVs:
JVC LT-39M440 (Panel V390HJ1-P02), MYSTERY MTV-4022LT2 (Panel V390HJ1-P02), MYSTERY MTV-4018LT2 (Panel V390HJ1-P02), MYSTERY MTV-4026LT2 (Panel V400HJ6-PE1), MYSTERY MTV-4028LT2 (Panel V390HJ1-P02).
The appearance of the power supply
Main features of the MYSTERY MTV-4028LT2 device:
Installed matrix (LED panel) V390HJ1-P02.
The matrix control uses the Timing Controller (T-CON) V390HJ1-XC01 ;.
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 necessary supply voltages for all nodes of the MYSTERY MTV-4028LT2 television are generated by the TV4205-ZC02-01 power supply module or its analogs using FAN7930 (PFC), OB2273 microcircuits and FDPF18N50 type power switches.
MainBoard - the main board (motherboard) is an MSDV3223-ZC01-01 module, using 25Q64-104HIP chips; K4B1G1646G-BCKO and others.
The NoName tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V390HJ1-P02
Type: a-Si TFT-LCD, CELL
Diagonal size: 39 inch
Resolution: 1920x1080, FHD
Display Mode: MVA, Normally Black, Transmissive
Active Area: 853.92x480.33 mm
Surface: Antiglare (Haze 3.5%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.8% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
MYSTERY MTV-4028LT2 TV with V390HJ1-P02 LCD display, diagonal size 39 "(99 cm) 16: 9 format. The required brightness of the screen is 250 cd / m² LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 1000: 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 for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems . Emah PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i Supported multimedia file formats:. MP3, WMA, MPEG4, 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. 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.
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 V390HJ1-P02 panel of the MYSTERY MTV-4028LT2 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.