Technical description and composition of the AKAI LEA-32L41P TV, panel type and applicable modules. The composition of the modules.AKAI LED
Model: LEA-32L41P
Chassis / Version: CV3463H-A42
Panel: ST3151A05-8
T-CON: MT3151A05-5-XC-5 ST3151A05-8
LED driver (backlight): integrated into Mainboard; 350mA 46-63V
PWM LED driver: BIT3267
MOSFET LED driver: MDD1051
Power Supply (PSU): integrated into Mainboard
PWM Power: PWM SOT23-6
MainBoard: CV3463H-A42
IC MainBoard: 25Q64BSIG, TPA3110LD2
Tuner: CDT-9NT372-RF01, CDT-9NS161-RD41
Technical Specifications LEA-32L41P
AKAI LEA-32L41P
General repair guidelines for TV LCD LED
Possible malfunctions
- AKAI LEA-32L41P does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely, in this case, the main switching power supply (IIPS) is faulty, all of whose elements are located on the main board. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown (short circuit).
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the main fuse or current sensor at the source of the key most often 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 also be PWM SW23-6 PWM. It is checked only by replacement with a known good one.
- 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.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the 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 indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the CV3463H-A42 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. Testing or replacing elements 25Q64BSIG, TPA3110LD2 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 tuner CDT-9NT372-RF01, CDT-9NS161-RD41 is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
It should be remembered! Attempts to independently repair the AKAI LEA-32L41P 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!
The appearance of the MainBoard CV3463H-A42 is shown in the figure below:CV3463H-A42
CV3463H-A42 can be used in TVs:
AKAI LEA-32L41P (Panel ST3151A05-8), AKIRA 32LED01T2M (Panel SM315TWD602 D0206).
Key Features of the AKAI LEA-32L41P:
Installed matrix (LED panel) ST3151A05-8.
The matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5.
The LED driver integrated is used to power the backlight LEDs, it is controlled by the BIT3267 PWM controller. As power elements of the LED driver, keys of the MDD1051 type are used.
The power module is combined with the MainBoard and is designed according to the flyback AC / DC voltage converter using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a CV3463H-A42 module, using 25Q64BSIG, TPA3110LD2 and others.
The tuner CDT-9NT372-RF01, CDT-9NS161-RD41 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CSOT
Model: ST3151A05-8
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: HVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 7.16% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 62%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Brand: AKAI, Model: LEA-32L41P.
Briefly from the TV: LCD, LED backlight, 31.5 ", 1366x768, 720p HD, DVR, sound: 12 W, HDMI connectors: 3.
The composition uses MainBoard CV3463H-A42 and an LCD panel (matrix) ST3151A05-8. The power supply is combined with the MainBoard.
AKAI LEA-32L41P TV with an ST3151A05-8 LCD display, diagonal size 31.5 "(80 cm) in 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 5000 : 1. Direct LED backlighting is used in the LCD panel, HD images can be viewed in high quality with a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 12 W (2x6 W) provide 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, component, VGA, HDMI x3, USB. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV working in the network mode is 60 watts.
Overall dimensions: With stand 738x484x165 mm, Without stand 738x436x82 mm.
TV mass: 6 kg.
Attention! The ST3151A05-8 panel of the AKAI LEA-32L41P 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.