Technical description and composition of the MYSTERY MTV-2620LW TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-2620LW
Chassis / Version: MSDV3213-ZC01-01
Panel: V260B2-LE3 Rev.c1
T-CON: V260B2-P03; CM1721B, TPS65161
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3039AM, AP3608EM-G1
MOSFET LED driver: B6010D
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: MSDV3213-ZC01-01
IC MainBoard: SPI Flash: MX25L3206E
Tuner: DT58WT-3RB-E
Technical Specifications MTV-2620LW
MYSTERY MTV-2620LW
General repair guidelines for TV LCD LED
Repair of electronic devices, including the MYSTERY MTV-2620LW TV, it is advisable to start with an external examination of its external and internal elements. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of 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.
Malfunctions of the power module can be expressed in different ways, for example, the MYSTERY MTV-2620LW 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. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
Sometimes the MYSTERY MTV-2620LW TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter for the backlight LEDs of the V260B2-LE3 panel, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
Diagnostics and repair of the motherboard MSDV3213-ZC01-01 is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: MT5TU32M160G-AC, Flash: MX25L3206E, AP3608EM-G1 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If you suspect a malfunction of the DT58WT-3RB-E tuner, first of all, you need to make sure that the voltage of the varicaps (30-33V) is present on the corresponding output of the tuner, as well as other voltage supplying it.
Owners and users of the MYSTERY MTV-2620LW TV 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-2620LW, Main MSDV3213-ZC01-01, PANEL V260B2-LE3
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 MSDV3213-ZC01-01 is shown in the figure below:
MSDV3213-ZC01-01
MSDV3213-ZC01-01 can be used in TVs:
BBK LEM1981 (Panel V185B1-L17 Rev.C1 CMO), BBK LEM2481FDT (Panel V236H1-LE5), BBK LEM2682 LEM2682DT (Panel V260B2-LE11 Rev.C1), BBK LEM2281FDT (Panel CLAA215FA10), BBK LEM2685DTG (Panel V260H1-LE8 REV.C1), MYSTERY MTV-2620LW (Panel V260B2-LE3 Rev.c1).
Main features of the MYSTERY MTV-2620LW device:
Installed matrix (LED-panel) V260B2-LE3 Rev.c1.
The matrix control uses the Timing Controller (T-CON) V260B2-P03 ;.
To power the backlight LEDs, a converter is used, combined with the main board MSDV3213-ZC01-01, controlled by the AP3039AM, AP3608EM-G1 PWM controller. As power elements of the LED driver, keys of the type B6010D are used.
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 MSDV3213-ZC01-01 module, using SPI Flash chips: MX25L3206E and others.
Tuner DT58WT-3RB-E provides the reception of television programs and tuning to channels.
MYSTERY MTV-2620LW TV with V260B2-LE3 LCD, 26 "(66 cm) diagonal, 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. The LED-panel of this TV has end-face LED illumination - Edge LED.The TV design and technical features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). 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, MPEG4, JPEG.
The power of the acoustic system of sound 6 W (2x3 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, component, SCART, RGB, VGA, HDMI x2, USB. 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: 800x600, 1024x768, 1920x1080.
The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 55 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The V260B2-LE3 Rev.c1 panel of the MYSTERY MTV-2620LW 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.