Technical description and composition of the AKAI LES-32X82WF TV, panel type and applicable modules. The composition of the modules.AKAI LED
Model: LES-32X82WF
Chassis / Version: TP.MS338E.PB803
Panel: HK315LEDM-SHXUH LK315T3HB87
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273 (PWM SOT23-6)
MOSFET Power: TK5P65W 650V5.2A TO-252
MainBoard: TP.MS338E.PB803
IC MainBoard: MSB102KT, EMMC: THGBMDG5D1LBAIL, SPI: 25L4006E
Tuner: CDT-9NT372
Technical Specifications LES-32X82WF
AKAI LES-32X82WF
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The AKAI LES-32X82WF TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In this case, first of all, you should check the operability of the main power source - the AC / DC network voltage converter, all of whose elements are located on the MainBoard TP.MS338E.PB803 board. It is then necessary to measure its output voltages and, if they are absent, check the power switches (TK5P65W 650V5.2A TO-252) and the rectifier diodes of the converters for a short circuit probability.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
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 circuits (OOS) of stabilization. PWM controllers (PWM) OB2273 (PWM SOT23-6), if they do not have visible damage to the case and open fault between the terminals, are usually 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 some of these cases, the malfunction is caused by a lack of backlighting on the display. 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 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 TP.MS338E.PB803 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips MSB102KT, EMMC: THGBMDG5D1LBAIL, SPI: 25L4006E and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If the TV works normally from external devices, but does not tune to television channels, the tuner CDT-9NT372 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.
Attention to users! Self-repair of the AKAI LES-32X82WF TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Repair MainBoard
The appearance of MainBoard TP.MS338E.PB803 is shown in the figure below:
TP.MS338E.PB803
Key Features of the AKAI LES-32X82WF:
Installed matrix (LED-panel) HK315LEDM-SHXUH LK315T3HB87.
To power the backlight LEDs, a converter is used, combined with the main board TP.MS338E.PB803.
The power module is combined with the MainBoard and is made according to the scheme of a flyback AC / DC voltage converter using chips OB2273 (PWM SOT23-6) and power switches of the type TK5P65W 650V5.2A TO-252.
MainBoard - the main board (motherboard) is a module TP.MS338E.PB803, using microchips MSB102KT, EMMC: THGBMDG5D1LBAIL, SPI: 25L4006E and others.
Tuner CDT-9NT372 provides the reception of television programs and tuning to channels.
Brand: AKAI, Model: LES-32X82WF.
Briefly from the TV: LCD, LED backlight, 31.5 ", 1366x768, 720p HD, DVR, sound: 12 W, HDMI connectors: 3, Internet access, Wi-Fi, Smart TV.
The composition uses MainBoard TP.MS338E.PB803 and LCD-panel HK315LEDM-SHXUH LK315T3HB87. The power supply is combined with the MainBoard.
TV AKAI LES-32X82WF with LCD HK315LEDM-SHXUH, diagonal size 31.5 "(80 cm) 16: 9 format. The required brightness of the screen 180 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 800 : 1. Direct LED backlighting is used in the LCD panel, and HD images can be viewed at 1366x768 pixels in 720p (HD Ready) graphic decomposition standard.
The LES-32X82WF TV model has built-in SMART software and pre-installed Android Operating System. Connecting to a network can be done via Wi-Fi.
The power of the sound system 12 W (2x6 W) provides 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 x2, Ethernet (RJ-45), Wi-Fi 802.11n. An output for connecting headphones is provided. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV working in the network mode is 55 watts.
Overall dimensions: with stand 726x472x180 mm, without stand 726x435x54 mm.
TV Weight: 6.6 kg.
Attention! The HK315LEDM-SHXUH LK315T3HB87 panel of the AKAI LES-32X82WF 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.