Technical description and composition of the AKAI LEA-32C25M TV, panel type and applicable modules. The composition of the modules.AKAI LED
Model: LEA-32C25M
Chassis / Version: JUC7.820.00081373
Panel: M320X13-E1-H
T-CON: MT3151A05-3-XC-1
LED driver (backlight): integrated into PSU
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251 (PWM SOT23-6)
MOSFET Power: MDF7N65B
MainBoard: JUC7.820.00081373
IC MainBoard: SPI Flash: EN25Q32
Tuner: R620D
Technical Specifications LEA-32C25M
AKAI LEA-32C25M
General repair guidelines for TV LCD LED
Possible malfunctions
- The AKAI LEA-32C25M TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Often in such cases, the main power source - the AC / DC voltage converter, which is combined with the MainBoard JUC7.820.00081373, is faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches (MDF7N65B) of the converters and rectifier diodes for a possible 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip NCP1251 (PWM SOT23-6) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). 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 JUC7.820.00081373 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - SPI Flash: EN25Q32. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If you suspect a malfunction of the R620D tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and impulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
TV users and owners must remember that attempts to self-repair an AKAI LEA-32C25M TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> AKAI LEA-32C25M, Main: JUC7.820.00081373, Panel: M320X13-E1-H
The appearance of the MainBoard JUC7.820.00081373 is shown in the figure below:JUC7.820.00081373
JUC7.820.00081373 can be used in TVs:
AKAI LEA-32C25M (Panel M320X13-E1-H), ERISSON 32LEC2300 (Panel M320X13-E1-L), FUSION FLTV-28L32B (Panel M280X13-E1-H).
Key Features of the AKAI LEA-32C25M:
Installed matrix (LED-panel) M320X13-E1-H.
The matrix control uses the Timing Controller (T-CON) MT3151A05-3-XC-1.
To power the backlight LEDs, a converter is used, combined with a power supply.
The power module is combined with the MainBoard and is made according to a flyback AC / DC voltage converter using NCP1251 microcircuits (PWM SOT23-6) and power switches of the MDF7N65B type.
MainBoard - the main board (motherboard) is a JUC7.820.00081373 module, using SPI Flash chips: EN25Q32 and others.
The R620D tuner provides TV reception and channel tuning.
Brand: AKAI, Model: LEA-32C25M.
Briefly from the TV: LCD, LED backlight, 32 ", 1366x768, 720p HD, sound: 16W, HDMI connectors: 2.
The composition uses MainBoard JUC7.820.00081373 and an LCD panel (matrix) M320X13-E1-H. The power supply is combined with the MainBoard.
AKAI LEA-32C25M TV with M320X13-E1-H LCD, 32 "(81 cm) diagonal size of 16: 9 format. The required brightness of the screen is 250 cd / m² with LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 3000: 1. Direct LED backlighting is used in the LCD panel. HD images can be viewed in high resolution at 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM , NTSC. Graphic Processing Digital signal rejection and generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x2, USB x2. 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 735x494x220 mm, Without stand 735x441x88 mm.
Mass of the TV: 6.9 kg.
Attention! The M320X13-E1-H panel of an AKAI LEA-32C25M 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.