Technical description and composition of the AKAI LTA-1581 TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-1581
Chassis / Version: CV075GT_V3
Panel: SVA150XG04TB
Lamp backlight: 2 Lamp CCFL
Inverter (backlight): DP-02-15052; 2 lamp
Power Supply (PSU): Adapter 12V
MainBoard: CV075GT_V3
IC MainBoard: CPU: MST718BE-LF SPI FLASH: EN25D20 (D20-100GCP), EEPROM: MIC24LC16BI, SWITCH: HCF4052, AUDIO: TDA1517P + MSP3415G B8 V3
Tuner: TSN3311-Q
Control: Remote GCOVA1028SJ
Technical Specifications LTA-1581
AKAI LTA-1581
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-1581 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, in some cases, the Adapter power module 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 necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
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.
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), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately 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.
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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the CV075GT_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). 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: MST718BE-LF SPI FLASH: EN25D20 (D20-100GCP), EEPROM: MIC24LC16BI, SWITCH: HCF4052, AUDIO: TDA1517P + MSP3415G B8 V3. BGA chip malfunctions are usually easy to detect by warming up.
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-1581 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!
Repair MainBoard
The appearance of MainBoard CV075GT_V3 is shown in the figure below:
CV075GT_V3
Key Features of the AKAI LTA-1581:
Installed matrix (LCD panel) SVA150XG04TB.
To power the backlight used inverter DP-02-15052 ;.
To power all internal components of the AKAI LTA-1581 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a CV075GT_V3 module, using CPU chips: MST718BE-LF SPI FLASH: EN25D20 (D20-100GCP), EEPROM: MIC24LC16BI, SWITCH: HCF4052, AUDIO: TDA1517P + MSP3415G B8 V3 and others.
The TSN3311-Q tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA150XG04TB
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.128x228.096 mm
Brightness: 250 cd / m²
Contrast Ratio: 450: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 60%
Response Time: 3/9 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V
Brand: AKAI, Model: LTA-1581.
Short from TV: LCD, 15 ", 1024x768, sound: 6 watts.
The composition uses MainBoard CV075GT_V3 and LCD-panel SVA150XG04TB.
Power supply unit external Adapter 12V.
AKAI LTA-1581 TV with SVA150XG04TB LCD, 15 "diagonal size, 4: 3 format. 250 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 450: 1. 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 the standards 480i, 480p, 576i, 576p.
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: With stand 639x508x250 mm, Without stand 363x360x70 mm.
Attention! The SVA150XG04TB panel of the AKAI LTA-1581 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!