Technical description and composition of the MYSTERY MTV-1923LW TV, type of panel and applicable modules. The composition of the modules.MYSTERY LED
Model: MTV-1923LW
Chassis / Version: MSTV2409-ZC01-01
Panel: HM185WX3-400
LED driver (backlight): integrated into MainBoard
PWM LED driver: AP3039AM-G1, AP3608EM
MOSFET LED driver: MDD1951
Power Supply (PSU): integrated into MainBoard
MainBoard: MSTV2409-ZC01-01
IC MainBoard: CPU: TSUMV59XUS; SPI Flash: MX25L3206E;
Technical Specifications MTV-1923LW
MYSTERY MTV-1923LW
General repair guidelines for TV LCD LED
TV MYSTERY MTV-1923LW, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
In the absence of any signs of operability, when the MYSTERY MTV-1923LW does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power module. 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.
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-1923LW TV does not have an image, but there is sound, a malfunction in the backlight circuits of the HM185WX3-400 LED panel 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 lines 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.
If the motherboard MSTV2409-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.
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: TSUMV59XUS; SPI Flash: MX25L3206E; . BGA chip malfunctions are usually easy to detect by warming up.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH -----------> MYSTERY MTV-1923LW, Main: MSTV2409-ZC01-01, Panel: HM185WX3-400
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 MSTV2409-ZC01-01 is shown in the figure below:
MSTV2409-ZC01-01
MSTV2409-ZC01-01 can be used in TVs:
BBK LEM1961 (Panel HM185WX1-400), Haier LE32M600 (Panel LK315T3HB94), Haier LE24M600F (Panel M240HTN01.0), HAIER LE22M600F (Panel LC215DT8A), HAIER LE24M660 (Panel V236BJ1-P03), MYSTERY MTV-3022LW (Panel V290BJ1-PE1), MYSTERY MTV-1923LW (Panel HM185WX3-400).
Main features of the MYSTERY MTV-1923LW device:
The matrix (LED panel) HM185WX3-400 is installed.
To power the backlight LEDs, a converter is used, combined with the main board MSTV2409-ZC01-01, controlled by the AP3039AM-G1, AP3608EM 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.
MainBoard - the main board (motherboard) is an MSTV2409-ZC01-01 module, using CPU chips: TSUMV59XUS; SPI Flash: MX25L3206E; and others.
Additional technical information about the panel:
Brand: BOE
Model: HM185WX3-400
Type: a-Si TFT-LCD, CELL
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H), Antireflection
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.4% (with Polarizer)
Contrast Ratio: 600: 1
Display Colors: 16.7M (8-bit)
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
MYSTERY MTV-1923LW TV with HM185WX3-400 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 250 cd / m² is provided by 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, JPEG.
The power of the sound system 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, VGA, HDMI, 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: 640x480, 800x600, 1024x768, 1360x768.
Overall dimensions: With stand 642x444x209 mm, Without stand 642x398x44 mm.
Attention! The HM185WX3-400 panel of the MYSTERY MTV-1923LW 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.