Technical description and composition of the MYSTERY MTV-3230LT2 TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-3230LT2
Chassis / Version: MS308C1-ZC01-01 V2P04
Panel: V320BJ7-PE1
LED backlight: LED315D10-07 (B) (30331510219)
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3064, OB3350
MOSFET LED driver: MDD1951
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273 (PWM SOT23-6)
MOSFET Power: SMK0870F
MainBoard: MS308C1-ZC01-01
IC MainBoard: CPU: MSD308BEM, SPI Flash: GD25Q64, SOUND: NC / TPA1517
Tuner: TDA18275
Technical Specifications MTV-3230LT2
MYSTERY MTV-3230LT2
General repair guidelines for TV LCD LED
Repair of TVs, as well as other devices, it is advisable to start with an external examination. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the MYSTERY MTV-3230LT2 does not turn on, no control lights on the front panel light up or blink; therefore, there is a very high probability of a power module malfunction. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If the MYSTERY MTV-3230LT2 TV does not have an image, but there is sound, a malfunction in the backlight circuits of the LED panel V320BJ7-PE1 is likely.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
If the motherboard MS308C1-ZC01-01 is faulty, first of all it is necessary to check all the linear stabilizers and power converters of its chips, and also, if necessary, update the software (software). Sometimes you can check the health of MB only by replacement.
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its SPI Flash chips: GD25Q64 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Owners of MTV-3230LT2 TVs are recommended to contact qualified specialists with experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MS308C1-ZC01-01
To reduce the backlight current in LED drivers with the AP3064 controller (AP3064AM), it is necessary to proportionally increase the resistance of the resistor from pin 2 (ISET) to the housing. The maximum current in each of the four channels (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 1200 / Rset.
Repair MainBoardThe appearance of the MainBoard MS308C1-ZC01-01 is shown in the figure below:
MS308C1-ZC01-01
MS308C1-ZC01-01 can be used in TVs:
Haier LE32B8000T (Panel LSC320AN02-S01), JVC LT-32M340 (Panel LK315T3HB87 ), MYSTERY MTV-3230LT2 (Panel V320BJ7-PE1), MYSTERY MTV-2426LT2 (Panel V236BJ1-P03), MYSTERY MTV-2231LT2 (Panel LC215DT4A).
Main features of the MYSTERY MTV-3230LT2 device:
Installed matrix (LED-panel) V320BJ7-PE1.
To power the backlight LEDs, a converter is used, combined with the main board MS308C1-ZC01-01, controlled by the AP3064, OB3350 PWM controller. As the power elements of the LED driver, keys of the MDD1951 type are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using OB2273 microcircuits (PWM SOT23-6) and power switches of the SMK0870F type.
MainBoard - the main board (motherboard) is an MS308C1-ZC01-01 module, using CPU chips: MSD308BEM, SPI Flash: GD25Q64, SOUND: NC / TPA1517 and others.
The TDA18275 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: INNOLUX
Model: V320BJ7-PE1
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (2H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 6.86% (with Polarizer)
Contrast Ratio: 1400
Display Colors: 16.7M (8-bit)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
MYSTERY MTV-3230LT2 TV with V320BJ7-PE1 LCD display, 32 "(81 cm) diagonal size of 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 2000: 1. Edge LED backlighting is realized in the LED-panel of this TV - Edge LED. You can view high-quality images 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, MKV, JPEG.
The power of the sound system 16 W (2x8 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. 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.
Overall dimensions: 732x472x200 mm.
TV Weight: 5 kg.
Attention! The V320BJ7-PE1 panel of the MYSTERY MTV-3230LT2 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.