Technical description and composition of the TV AIWA 24LE7020, type of panel and applicable modules. The composition of the modules.AIWA LED
Model: 24LE7020
Chassis / Version: V1P02 // V1N08
Panel: V236BJ1-P01 // V236BJ1-P3
PWM LED driver: OB3362HP
Power Supply (PSU): Adapter 12V
MainBoard: CV9202L-T
IC MainBoard: Cpu: SPV9202BD, DDRAM: W6310GKB-12, Spi Flash: 25Q64, SOUND: YD1517
Tuner: ST03WS-2A-E
Specifications 24LE7020
AIWA 24LE7020
General repair guidelines for TV LCD LED
Possible malfunctions
- The AIWA 24LE7020 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light or flash indicators.
In some of these cases, the main switching power supply, the Adapter module, is faulty.
This TV model is equipped with an external power adapter adapter type 12V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is a certain sense to open it and eliminate simple typical defects typical of IPS. It is necessary to measure its output supply voltage, 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 semiconductor PN junctions.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- 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 CV9202L-T 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - Cpu: SPV9202BD, DDRAM: W6310GKB-12, Spi Flash: 25Q64, SOUND: YD1517 with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner ST03WS-2A-E. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
For owners of the 24LE7020 TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> AIWA 24LE7020 V1P02, Main: CV9202L-T, Panel: V236BJ1-P0
FIRMWARE FOR SPI FLASH -----------> AIWA 24LE7020 V1N08, Main: CV9202L-T, Panel: V236BJ1-P3
The appearance of the MainBoard CV9202L-T is shown in the figure below:CV9202L-T
The MainBoard CV9202L-T uses the SPV9202BD processor, W6310GKB-12 RAM, and SPI FLASH 8Mb ROM.
It is advisable to start the repair of the motherboard by checking all voltage converters and linear stabilizers necessary to provide power to the nodes and chips in the operating and standby modes. The processor core is powered by + 1V. Also, for operation of the SPV9202BD, voltages + 2.5V and + 3.3V are required. Check the power of the LCD panel (depending on the type, + 5V or + 12V), it is convenient to measure directly on the LVDS connector. If the TV does not exit Stand-by mode, if it has the necessary supply voltage, does not respond to the Remote Control and control buttons, the SPI Flash 25Q64 firmware should be updated.
CV9202L-T can be used in TVs:
AIWA 24LE7020 (Panel V236BJ1-P01), BBK 22LEM-1006/FT2C (Panel M215HTN01.1 KM215N19-AU-01), DEXP 19A3100 (Panel CX185LEDM), DEXP 22A7100 (Panel T215HVN01.0 M215HVN01.0), FUSION FLTV-24T22 (Panel M236HGE-P02), FUSION FLTV-22T22 (Panel 720p HD 1366x768), SHIVAKI STV-24LED14 (Panel V236BJ1-P01 / CX236LEDM), SUPRA STV-LC24T410FL (Panel M236HGE-P01), SUPRA STV-LC19T410WL (Panel HK185WLEDM CH25H), SUPRA STV-LC22T410FL (Panel LC215DT5A), SUPRA STV-LC24T410WL (Panel HK236WLEDM-CH24H), SUPRA STV-LC19T880WL (Panel LC185TT7A).
Key Features of AIWA 24LE7020:
Installed matrix (LED-panel) V236BJ1-P01 or V236BJ1-P3.
A converter controlled by the OB3362HP PWM controller is used to power the backlight LEDs.
To power all the internal components of the AIWA 24LE7020 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a CV9202L-T module using Cpu: SPV9202BD, DDRAM: W6310GKB-12, Spi Flash: 25Q64, SOUND: YD1517 and others.
The ST03WS-2A-E tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236BJ1-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 23.6 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 521.471x293.184 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.5% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Trademark: AIWA, Model: 24LE7020.
Briefly from the TV: LCD, LED backlight, 23.6 ", 1366x768, 720p HD, DVR, sound: 6 watts.
The composition uses MainBoard CV9202L-T and the LCD panel (matrix) V236BJ1-P01, or V236BJ1-P3.
Power supply unit external Adapter 12V.
AIWA 24LE7020 TV with V236BJ1-P01 LCD, 23.6 "(60 cm) diagonal size of 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 60,000: 1 is achieved by special control of the LEDs. This model uses side lighting from Edge LEDs.
The V236BJ1-P01 panel and the CV9202L-T motherboard software provide high-quality HD viewing at 1366x768 pixels in the 720p (HD Ready) graphic decomposition standard. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
Supported media file formats: MP3, WMA, MPEG4, 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, component, SCART, 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. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 550x401x174 mm, without stand 550x342x48 mm.
TV Weight: with stand: 3.34 kg, without stand: 3.05 kg.
Attention! The V236BJ1-P01 panel of the AIWA 24LE7020 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.