Technical description and composition of the TV AKAI LEA-19V02S, type of panel and applicable modules. The composition of the modules.AKAI LED
Model: LEA-19V02S LEA-19V02SW
Chassis / Version: HK-T.MSTV59V08
Panel: T185S81-L02 // T185S03-L03
LED driver (backlight): 12V Led Driver
Power Supply (PSU): Adapter 12V
MainBoard: HK-T.MSTV59V08
IC MainBoard: 25Q32
Tuner: NoName
Technical Specifications LEA-19V02S
AKAI LEA-19V02S
General repair guidelines for TV LCD LED
Possible malfunctions
- The AKAI LEA-19V02S TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
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 supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
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. 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, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Often in such cases, there is no LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard HK-T.MSTV59V08 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - 25Q32 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the NoName tuner 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.
It should be remembered! Attempts to independently repair the AKAI LEA-19V02S 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!
FIRMWARE FOR SPI FLASH -----------> AKAI LEA-19V02S, Main: HK-T.MSTV59V08, Panel: T185S03-L03
FIRMWARE FOR SPI FLASH -----------> AKAI LEA-19V02S, Main: HK-T.MSTV59V08, Panel: T185S81-L02
The appearance of the MainBoard HK-T.MSTV59V08 is shown in the figure below:HK-T.MSTV59V08
Key Features of the AKAI LEA-19V02S:
The matrix (LED panel) T185S81-L02 or T185S03-L03 is installed.
The 12V LED driver is used to power the backlight LEDs.
To power all internal components of the AKAI LEA-19V02S TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is an HK-T.MSTV59V08 module, using 25Q32 chips and others.
The NoName tuner provides television reception and channel tuning.
Brand: AKAI, Model: LEA-19V02S.
Briefly from the TV: LCD, LED backlight, 19 ", 1366x768, 720p HD, sound: 6 watts.
The composition uses MainBoard HK-T.MSTV59V08 and LCD-panel T185S81-L02, or T185S03-L03.
Power supply unit external Adapter 12V.
AKAI LEA-19V02S TV with a T185S81-L02 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. This model uses side LED backlight LED Edge. You can view images in high quality HD at a resolution of 1366x768 pixels in standard 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 the standards 480i, 480p, 576i, 576p, 720p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
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, component, VGA, HDMI, USB. 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.
Overall dimensions: With stand 445x320x175 mm, Without stand 445x276x58 mm.
Mass of the TV: 2.3 kg.
Attention! The T185S81-L02 panel of the AKAI LEA-19V02S LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.