Technical description and composition of the AKAI LTA-15A301 TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-15A301
Panel: M150XN4
T-CON: M $ 35M15X0470
Inverter (backlight): 1517 inverter 100.PCB TDF0430
PWM Inverter: LX1691 / IPW, LM393M
MOSFET Inverter: Si9945AEY (8) MMBT2907A
Power Supply (PSU): adapter AKAI-12040-3A
MainBoard: 1517-MRTTV100
Tuner: JS-6B2 / 121
Control: RM-610
Technical Specifications LTA-15A301
AKAI LTA-15A301
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-15A301 TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
With such manifestations, in most cases, the adapter power module is faulty.
The owner of a TV can purchase an external power adapter such as adapter and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. It is necessary to measure its secondary output voltages, 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, 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 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 1517-MRTTV100 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 the TV works normally from external devices, but does not tune into television channels, the tuner JS-6B2 / 121 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, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AKAI LTA-15A301
Key Features of the AKAI LTA-15A301:
Installed matrix (LCD-panel) M150XN4.
The matrix control uses the Timing Controller (T-CON) M $ 35M15X0470.
To power the backlight, an inverter 1517 is used, it is controlled by the PWM controller LX1691 / IPW, LM393M. As power elements of the inverter, keys of the type Si9945AEY (8) MMBT2907A are used.
To power all internal components of the AKAI LTA-15A301 TV, an external adapter type AKAI-12040-3A is used.
MainBoard - the main board (motherboard) is a 1517-MRTTV100 module.
The JS-6B2 / 121 tuner provides television reception and channel tuning.
Trademark: AKAI, Model: LTA-15A301.
Short from TV: LCD, 15 ", 1024x768, sound: 6 watts.
The composition uses MainBoard 1517-MRTTV100 and an LCD panel (matrix) M150XN4.
External power adapter AKAI-12040-3A.
AKAI LTA-15A301 TV with an M150XN4 LCD display, a diagonal size of 15 "in 4: 3 format. Screen brightness of 500 cd / m² is ensured by backlighting with CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 400: 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 speaker system of sound 6 W (3 W x 2) 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, 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 820x620x250 mm, Without stand 820x560x110 mm.
TV Weight: 5.5 kg.
Attention! The M150XN4 panel of the AKAI LTA-15A301 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!