Technical description and composition of the AKAI LTA-19E307D TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-19E307D
Chassis / Version: CV075GST_V3
Panel: M190A1-L07 REV.C2
T-CON: LVDS (2 chanel, 8-bit), 30 pins, Voltage: 5.0V
Inverter (backlight): IVT0405-01
PWM Inverter: SP5001Q
MOSFET Inverter: 4620
Power Supply (PSU): Adapter 12V
MainBoard: CV075GST_V3
IC MainBoard: CPU: MST718BU-LF, EEPROM: 24LC16, SPI FLASH: 25F20
Tuner: TSN3311-Q
Technical Specifications LTA-19E307D
AKAI LTA-19E307D
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-19E307D TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
The external adapter 12V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is then necessary to measure its output voltages and, if they are absent, it is necessary to check the power switches and rectifier diodes of the converters for a short-circuit probability.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
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.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the CV075GST_V3 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - EEPROM: 24LC16, SPI FLASH: 25F20 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
A TSN3311-Q tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
It should be remembered! Attempts to independently repair the AKAI LTA-19E307D TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> AKAI LTA-19E307D, Main: CV075GST_V3, Panel: M190A1-L07 REV.C2
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CV075GS_V2
The appearance of MainBoard CV075GST_V3 is shown in the figure below:CV075GST_V3
CV075GST_V3 can be used on TVs:
AKAI LTA-15E307 (Panel SVA150XG10TB), AKAI LTA-19E307D (Panel M190A1-L07 REV.C2).
Key Features of the AKAI LTA-19E307D:
Installed matrix (LCD panel) M190A1-L07 REV.C2.
The matrix control uses the Timing Controller (T-CON) LVDS.
To power the backlight, an IVT0405-01 inverter is used, it is controlled by the SP5001Q PWM controller. As power elements of the inverter, keys of type 4620 are used.
To power all the internal components of the AKAI LTA-19E307D TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a CV075GST_V3 module, using CPU chips: MST718BU-LF, EEPROM: 24LC16, SPI FLASH: 25F20 and others.
The TSN3311-Q tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M190A1-L07
Type: a-Si TFT-LCD, Panel
Diagonal size: 19.0 inch
Resolution: 1440x900, WXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 410.4x256.5 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 380 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Brand: AKAI, Model: LTA-19E307D.
Short from TV: LCD, built-in DVD player, 19 ", 1440x900, sound: 6 watts.
The composition uses MainBoard CV075GST_V3 and an LCD panel (matrix) M190A1-L07 REV.C2.
Power supply unit external Adapter 12V.
AKAI LTA-19E307D TV with an M190A1-L07 LCD, 19 "(48 cm) diagonal 16:10 format. Screen brightness of 300 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 700: 1. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p. Supported media file formats: MP3, WMA, MPEG4, VideoCD, SVCD, Picture CD, 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, S-Video, SCART, RGB, VGA. 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.
Overall dimensions: 488x374x103 mm.
TV Weight: 6.8 kg.
Attention! The M190A1-L07 REV.C2 panel of the AKAI LTA-19E307D 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!