Technical description and composition of the AKAI LTA-15E307 TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-15E307
Chassis / Version: CV075GST_V3
Panel: SVA150XG10TB
Power Supply (PSU): Adapter
MainBoard: CV075GST_V3
IC MainBoard: MST718BU-LF F20-100GCP 24C16 TPA1517P, SC7313S
Tuner: TSN3311-0
Technical Specifications LTA-15E307
AKAI LTA-15E307
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-15E307 TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
With such manifestations, a malfunction is most likely to be detected in the Adapter power module.
The external adapter 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 the output voltages in the secondary circuits, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- 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 inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, 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 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). Board repair and replacement of chips MST718BU-LF F20-100GCP 24C16 TPA1517P, SC7313S are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before changing the tuner TSN3311-0, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention! Users and owners of LTA-15E307 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
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-15E307:
Installed matrix (LCD panel) SVA150XG10TB.
To power all internal components of the AKAI LTA-15E307 TV, an external adapter type source is used.
MainBoard - the main board (motherboard) is a CV075GST_V3 module, using the MST718BU-LF F20-100GCP 24C16 TPA1517P, SC7313S, and other chips
The TSN3311-0 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA150XG10TB
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: 600: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 60%
Response Time: 2/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V
Trademark: AKAI, Model: LTA-15E307.
Short from TV: LCD, 15 ", 1024x768, sound: 6 watts.
The composition uses MainBoard CV075GST_V3 and an LCD panel (matrix) SVA150XG10TB.
Power Supply External Adapter.
AKAI LTA-15E307 TV with SVA150XG10TB LCD, 15 "diagonal size, 16: 9 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 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, 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 390x390x190 mm, Without stand 390x340x70 mm.
Attention! The SVA150XG10TB panel of the AKAI LTA-15E307 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!