Technical description and composition of the MYSTERY MTV-3228LTA2 TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-3228LTA2
Chassis / Version: MSDV3225-ZC01-01
Panel: LSC320AN02
LED backlight: CRH-P32CA3535T030751U-REV1.0
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3608EM-G1 (20pin), AP3039AM-G1 (14pin)
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: MSDV3225-ZC01-01
IC MainBoard: SPI Flash: GD25Q64BS;
Tuner: F33WT-3DDR-E
Technical Specifications MTV-3228LTA2
MYSTERY MTV-3228LTA2
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs of MYSTERY MTV-3228LTA2, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Malfunctions of the power module can be expressed in different ways, for example, the MYSTERY MTV-3228LTA2 does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the MYSTERY MTV-3228LTA2 TV does not have an image, but there is sound, a malfunction in the backlight circuits of the LED panel LSC320AN02 is likely.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
Diagnosis and repair of the MSDV3225-ZC01-01 motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SPI Flash: GD25Q64BS; and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before replacing the F33WT-3DDR-E tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals.
Owners and users of the MYSTERY MTV-3228LTA2 television must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> MYSTERY MTV-3228LTA2, Main: MSDV3225-ZC01-01, Panel: LSC320AN02
To reduce the backlight current in LED drivers with the AP3039AM controller and the AP3608EM terminal stage (AP3039AM-G1 & AP3608EM-G1), the AP3608EM (AP3608E) microcircuit should proportionally increase the resistor from terminal 14 (ISET) to the housing. The maximum current in each channel (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 1.194V / Rset. In channels connected in parallel, the currents add up.
Repair MainBoardThe appearance of the MainBoard MSDV3225-ZC01-01 is shown in the figure below:
MSDV3225-ZC01-01
MSDV3225-ZC01-01 can be used in TVs:
MYSTERY MTV-3029LTA2 (Panel ST2751A01-1), MYSTERY MTV-3228LTA2 (Panel LSC320AN02).
Main features of the MYSTERY MTV-3228LTA2 device:
Installed matrix (LED panel) LSC320AN02.
To power the backlight LEDs, a converter is used, combined with the main board MSDV3225-ZC01-01, controlled by a PWM controller AP3608EM-G1 (20pin), AP3039AM-G1 (14pin).
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is an MSDV3225-ZC01-01 module, using SPI Flash chips: GD25Q64BS; and others.
The F33WT-3DDR-E tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LSC320AN02-0
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (2H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 6.5% (with Polarizer)
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 69%
Response Time: 20 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
MYSTERY MTV-3228LTA2 TV with LSC320AN02 LCD display, 32 "(81 cm) diagonal size in 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 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 of graphic decomposition 720p (HD Ready).
MTV-3228LTA2 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, Xvid, DivX, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 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, Ethernet (RJ-45), Wi-Fi 802.11n. 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.
The power consumed by the TV in the operating mode from the network is 50 watts.
Overall dimensions: 829x574x210 mm.
TV Weight: 5 kg.
Attention! The LSC320AN02 panel of the MYSTERY MTV-3228LTA2 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.