Technical description and composition of the MYSTERY MTV-1903W TV, type of panel and applicable modules. The composition of the modules.MYSTERY
Model: MTV-1903W
Chassis / Version: 090-V26012-00
Panel: M185GW01 V.A
Power Supply (PSU): Adapter 12V
MainBoard: 090-V26012-00
IC MainBoard: CPU: TSUMV26KU-LF, EEPROM: 24C64, Audio: CD1517CP, PWM: MP1484EN
Tuner: F21WT-3BAR-E
Technical Specifications MTV-1903W
MYSTERY MTV-1903W
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the MYSTERY MTV-1903W TV with a careful external examination of internal and external elements, including case parts, a display, buttons and cables. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
Sometimes the MYSTERY MTV-1903W TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is a failure of the common power module. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
Power switches in flyback converters 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 an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked.
Repair of the inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety during depressurization of lamps, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - TSUMV26KU-LF, 24C04, 24C64, CD1517CP, F80-100HCP, CT3257A, MP1484EN. Defective components should be replaced.
Owners of MTV-1903W TVs are recommended for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> EEPROM MYSTERY MTV-1903W, Main: 090-V26012-00
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MYSTERY MTV-1903W, Main: SPV7050-V02, Panel: M185GW01 V.A
MYSTERY MTV-1903W V1J04, Main: SPV7050-V02 T15.017050-02R, Panel: M185GW01 V.A, Tuner: CDT-6GPL28-00.
The appearance of MainBoard 090-V26012-00 is shown in the figure below:090-V26012-00
Main features of the MYSTERY MTV-1903W device:
Installed matrix (LCD panel) M185GW01 V.A.
To power all the internal components of the MYSTERY MTV-1903W TV, an external adapter 12V type source is used.
MainBoard - the main board (motherboard) is a 090-V26012-00 module using CPU chips: TSUMV26KU-LF, EEPROM: 24C64, Audio: CD1517CP, PWM: MP1484EN and others.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
The MYSTERY MTV-1903W TV with an M185GW01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The screen brightness of 220 cd / m² is ensured by backlighting with CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 500: 1. It is possible to 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 PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in mill Darts 480i, 480p, 576i, 576p, 720p.
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, S-Video, SCART, RGB, VGA, HDMI. 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.
The power consumed by the TV in the operating mode from the network is 36 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The M185GW01 V.A panel of the MYSTERY MTV-1903W LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!