Technical description and composition of the AKAI LEA-49K40M TV, panel type and applicable modules. The composition of the modules.AKAI LED
Model: LEA-49K40M
Chassis / Version: TP.S512.PC821
Panel: LSC490HN04-W
LED backlight: XZ49D12R-ZC21F-01
T-CON: 16Y_FF11BMA4C2LV0.3
LED driver (backlight): integrated into MainBoard
PWM LED driver: LD7750
MOSFET LED driver: 80R900P
Power Supply (PSU): integrated into MainBoard
PWM Power: LD5530, NCP1607B
MOSFET Power: 70R900P, MDF13N50B
MainBoard: TP.S512.PC821
IC MainBoard: S2T512, W25Q64BV, TPA3110D2, 1117
Tuner: R840 & XF-3SDT-H
Technical Specifications LEA-49K40M
AKAI LEA-49K40M
General repair guidelines for TV LCD LED
Possible malfunctions
- The AKAI LEA-49K40M 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.
The malfunction in such cases, first of all, should be sought in the power elements of a switching power supply (IIP) - a network voltage converter (AC / DC), which in this TV model is combined with the MainBoard TP.S512.PC821 main board. It is necessary to measure its output voltages and, if they are absent, to check the short circuit probability in the converters power switches (70R900P, MDF13N50B) and rectifier diodes.
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 power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers LD5530, NCP1607B, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. 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.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction 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 TP.S512.PC821 motherboard should be started by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). When repairing the MB board, it is necessary to check its components S2T512, W25Q64BV, TPA3110D2, 1117. Faulty elements should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If you suspect a malfunction of the R840 & XF-3SDT-H 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 pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
It should be remembered! Attempts to independently repair the AKAI LEA-49K40M 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!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MainBoard TP.S512.PC821
The appearance of MainBoard TP.S512.PC821 is shown in the figure below:TP.S512.PC821
TP.S512.PC821 can be used in TVs:
AKAI LEA-49K40M (Panel LSC490HN04-W), DEXP F48B7000V (Panel LCS480HN07), SHIVAKI STV-48LED15 (Panel LSC480HN05-B01), SHIVAKI STV-49LED17 (Panel LSC490HN03-W), SHIVAKI STV-50LED13 (Panel V500HJ1-PE8), THOMSON T48D16SF-01B (Panel LVF480SSDX E8 V1).
Key Features of the AKAI LEA-49K40M:
Installed matrix (LED panel) LSC490HN04-W.
The matrix control uses the Timing Controller (T-CON) 16Y_FF11BMA4C2LV0.3.
To power the backlight LEDs, a converter is used, combined with the TP.S512.PC821 main board, controlled by the LD7750 PWM controller. As the power elements of the LED driver, keys of the 80R900P type are used.
The power module is combined with the MainBoard and is made according to the scheme of a flyback AC / DC voltage converter using LD5530, NCP1607B microcircuits and power switches of the type 70R900P, MDF13N50B.
MainBoard - the main board (motherboard) is a module TP.S512.PC821, using chips S2T512, W25Q64BV, TPA3110D2, 1117 and others.
The R840 & XF-3SDT-H tuner provides TV reception and channel tuning.
Brand: AKAI, Model: LEA-49K40M.
Briefly from the TV: LCD, LED backlight, 49 ", 1920x1080, 1080p Full HD, DVR, sound: 18W, HDMI connectors: 3.
The composition uses MainBoard TP.S512.PC821 and LCD-panel LSC490HN04-W. The power supply is combined with the MainBoard.
AKAI LEA-49K40M TV with LSC490HN04-W LCD, 49 "(124 cm) diagonal size of 16: 9 format. The required screen brightness of 230 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1200 : 1. Direct LED backlighting is used in the LCD panel.The design and technical capabilities of the TV include watching broadcasts and movies in high quality HD with a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). Supported media file formats: MP3, MPEG4, MKV, JPEG.
The power of the speaker system of sound 18 W (2x9 V) 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, audio x2, 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 120 watts.
Overall dimensions: With stand 1110x699x239 mm, Without stand 1110x646x96 mm.
Mass of the TV: 12.1 kg.
Attention! The LSC490HN04-W panel of an AKAI LEA-49K40M 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.
