Technical description and composition of the AKAI LTA-20E305 TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-20E305
Panel: 20 inch
MainBoard: MST518V-LF A3MSB49092D
IC MainBoard: SAA5264PS / M3 / 0104 TVP5146M1 MSP3415G
Tuner: JS-6B2 / 121HS
Technical Specifications LTA-20E305
AKAI LTA-20E305
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-20E305 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.
In most of these cases, the main switching power supply is faulty. 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 the excess of maximum current or voltage values. 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, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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 of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. 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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the MST518V-LF 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - SAA5264PS / M3 / 0104 TVP5146M1 MSP3415G. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the tuner JS-6B2 / 121HS may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to self-repair a TV AKAI LTA-20E305 without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LTA-20E304, LTA-20E305, LTA-20E304MT, LTA-20E305MT, LTA-20E305DMT
Key Features of the AKAI LTA-20E305:Installed matrix (LCD-panel) 20 inch.
The required supply voltage for all nodes of the TV AKAI LTA-20E305 provides a switching power supply.
MainBoard - the main board (motherboard) is an MST518V-LF module, using SAA5264PS / M3 / 0104 TVP5146M1 MSP3415G microcircuits and others.
The JS-6B2 / 121HS tuner provides TV reception and channel tuning.
Brand: AKAI, Model: LTA-20E305.
Short from TV: LCD, 20 ", 640x480.
The composition uses MainBoard MST518V-LF A3MSB49092D and a 20-inch LCD panel (matrix).
The AKAI LTA-20E305 TV with an LCD 20, 20 "diagonal size, 4: 3 format. The screen brightness of 450 cd / m² is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 600: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i. Stereo sound is realized by two built-in 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),.
Overall dimensions: With stand 820x620x250 mm, Without stand 820x560x110 mm.
Attention! The 20-inch panel of the AKAI LTA-20E305 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!
Short from TV: LCD, 20 ", 640x480.
The composition uses MainBoard MST518V-LF A3MSB49092D and a 20-inch LCD panel (matrix).
The AKAI LTA-20E305 TV with an LCD 20, 20 "diagonal size, 4: 3 format. The screen brightness of 450 cd / m² is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 600: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i. Stereo sound is realized by two built-in 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),.
Overall dimensions: With stand 820x620x250 mm, Without stand 820x560x110 mm.
Attention! The 20-inch panel of the AKAI LTA-20E305 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!