Technical description and composition of the TV AKIRA LCT-42MT02ST, type of panel and applicable modules. The composition of the modules.AKIRA
Model: LCT-42MT02ST
Chassis / Version: TV3201-ZC01-02
Panel: T420XW01 V.7
Lamp backlight: 20 Lamp CCFL
Inverter (backlight): 4H.V1838.371 C2
PWM Inverter: OZ964SN
MOSFET Inverter: P2804ND5
Power Supply (PSU): MLT198L
PWM Power: MC0628R, NCP1653A (PFC), LD7550
MainBoard: TV3201-ZC01-02 303C3201075 (C)
IC MainBoard: MST9X88LD, 25X40VNIG, HY5DU281622FTP-5, STA540SA
Tuner: JS-6H2-12
Control: IR: TV1902-ZC25-01 (C)
Technical Specifications LCT-42MT02ST
AKIRA LCT-42MT02ST
General recommendations for repairing TV LCD
Possible manifestations of defects
- The TV AKIRA LCT-42MT02ST does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module of the MLT198L. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) MC0628R, NCP1653A (PFC), LD7550, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter. If all the electrolytic capacitors of the filter for the power supply of the inverter are working, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TV3201-ZC01-02 motherboard should be started by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MST9X88LD, 25X40VNIG, HY5DU281622FTP-5, STA540SA with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner JS-6H2-12 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention to users! Independent repair of a TV AKIRA LCT-42MT02ST without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Repair MainBoard
The appearance of the MainBoard TV3201-ZC01-02 is shown in the figure below:
TV3201-ZC01-02
TV3201-ZC01-02 can be used in TVs:
SUPRA STV-LC2601W (Panel V260B1-L02 REV.C1), SUPRA STV-LC2602WD (Panel 26 "), SUPRA STV-LC3201W (Panel V315B1-L01), SUPRA STV-LC3202W (Panel V315B1-L01).
The appearance of the power supply
Key Features of the AKIRA LCT-42MT02ST:
Installed matrix (LCD panel) T420XW01 V.7.
To power the backlight, an inverter 4H.V1838.371 is used, it is controlled by the PWM controller OZ964SN. As power elements of the inverter, keys of the type P2804ND5 are used.
The necessary supply voltages for all nodes of the TV AKIRA LCT-42MT02ST are generated by the MLT198L power supply module or its analogs using microchips MC0628R, NCP1653A (PFC), LD7550.
MainBoard - the main board (motherboard) is a TV3201-ZC01-02 module, using microcircuits MST9X88LD, 25X40VNIG, HY5DU281622FTP-5, STA540SA and others.
The JS-6H2-12 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420XW01 V7
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 930.25x523.01 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit)
Response time : 15/5 (Tr / Td); 6 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Brand: AKIRA, Model: LCT-42MT02ST.
Briefly from the TV: LCD, 42 ", 1920x1080, 1080p Full HD, there is PIP, sound: 30 W, HDMI connectors: 2.
The composition includes MainBoard TV3201-ZC01-02 303C3201075 (C) and LCD-panel T420XW01 V.7.
Power Supply Unit (PSU) MLT198L power Supply.
Technical description
AKIRA LCT-42MT02ST TV with T420XW01 LCD, 42 "(106 cm) diagonal size in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 1500 : 1. The design and technical capabilities of the TV provide for viewing in high quality HD with a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog PAL, SECAM, NTSC systems. Digital signal generation (graphic form am) produced in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound is 30 W (2x15 W). 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 x3, S-Video, component, SCART, RGB, VGA, HDMI x2. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
Overall dimensions: With stand 731x468x166 mm, Without stand 731x437x87 mm.
Attention! The T420XW01 V.7 panel of the AKIRA LCT-42MT02ST 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!