Technical description and composition of the AKAI LTA-15N686HCP TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-15N686HCP
Chassis / Version: JUG7.820.510-4
Panel: HT156WX1-100
Inverter (backlight): WYTU-009
Power Supply (PSU): Adapter 12V
MainBoard: JUG7.820.510-4
IC MainBoard: Cpu: MST718BE-LF, Spi Flash: 25X40AVN1G, Eeprom: 24LC32B
Tuner: TAF6-C2121VH
Technical Specifications LTA-15N686HCP
AKAI LTA-15N686HCP
General recommendations for repairing TV LCD
Possible malfunctions
- The AKAI LTA-15N686HCP TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In some of these cases, the main switching power supply, the Adapter 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. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the 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 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 JUG7.820.510-4 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements Cpu: MST718BE-LF, Spi Flash: 25X40AVN1G, Eeprom: 24LC32B requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
The malfunction of the TAF6-C2121VH tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention! For users and owners of LTA-15N686HCP TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> EEPROM AKAI LTA-15N686HCP, Main: JUG7.820.510-4 , Panel: HT156WX1-100
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AKAI LTA-15N686HCP Chassis LS03 LTA-15N602M, LTA-15N680HCP, LTA-15N686HCP, LTA-19N508HCP, LTA-22N680HCP, LTA-22N686HCP
The appearance of the MainBoard JUG7.820.510-4 is shown in the figure below:JUG7.820.510-4
JUG7.820.510-4 can be used on TVs:
AKAI LTA-15N686HCP (Panel HT156WX1-100), AKAI LTA-15N680HCP (Panel HT156WX1-100).
Key features of the AKAI LTA-15N686HCP device:
Installed matrix (LCD panel) HT156WX1-100.
To power the backlight used inverter WYTU-009.
To power all the internal components of the AKAI LTA-15N686HCP TV, an external adapter 12V type source is used.
MainBoard - the main board (motherboard) is a JUG7.820.510-4 module, using Cpu chips: MST718BE-LF, Spi Flash: 25X40AVN1G, Eeprom: 24LC32B and others.
The TAF6-C2121VH tuner allows you to receive television programs and tune to channels.
Brand: AKAI, Model: LTA-15N686HCP.
Short from TV: LCD, 15 ", 1366x768, 720p HD, sound: 4 watts.
The composition uses MainBoard JUG7.820.510-4 and an LCD panel (matrix) HT156WX1-100.
Power supply unit external Adapter 12V.
AKAI LTA-15N686HCP TV with HT156WX1-100 LCD, 15 "(38 cm) diagonal size in 16: 9 format. 250 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 500: 1. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in stand artworks 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 4 W (2x2 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, component, VGA. An output for connecting headphones is provided. 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, 1360x768.
The power consumed by the TV working in the network mode is 48 watts.
Overall dimensions: 387x306x115 mm.
Attention! The HT156WX1-100 panel of the AKAI LTA-15N686HCP 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!