Technical description and composition of the TV AKIRA LCT-15HE02ST, type of panel and applicable modules. The composition of the modules.AKIRA
Model: LCT-15HE02ST
Panel: B154EW01
Inverter (backlight): KB-5150 E123995
MOSFET Inverter: 9945N (8)
Trans Inverter: HUT-122
MainBoard: MK-D E248237
Tuner: AFT1 / W102G
Technical Specifications LCT-15HE02ST
AKIRA LCT-15HE02ST
General recommendations for repairing TV LCD
Possible malfunctions
- The AKIRA LCT-15HE02ST TV does not turn on, does not respond to the remote control and control panel buttons, and does not blink with any indicators.
Failure in such cases should be sought in the power supply circuits. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a 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.
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 an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the MK-D 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).
Before changing the AFT1 / W102G tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the AKIRA LCT-15HE02ST 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!
LCD TV, Diagonal 15-inch, Screen aspect ratio 16: 9, Resolution 1280x768
Key Features of the AKIRA LCT-15HE02ST:
Installed matrix (LCD panel) B154EW01.
To power the backlight used inverter KB-5150. A transformer HUT-122 is installed in the inverter converter. As power elements of the inverter, keys of type 9945N (8) are used.
The required supply voltage for all nodes of the TV AKIRA LCT-15HE02ST provides a switching power supply.
MainBoard - the main board (motherboard) is an MK-D module.
The AFT1 / W102G tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: B154EW01 VC 1 Compatible model
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.4 inch
Resolution: 1280x800, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 331.2x207 mm
Shape Style: Wedge (PCBA Bent, Depth? 5.2mm)
Surface: Glare (Haze 0%), Hard coating (3H), Reflection 4.3%
Brightness: 160 cd / m²
Contrast Ratio: 400: 1
Display Colors: 262K (6-bit)
Response Time: 4/12 (Tr / Td)
Frequency: 60Hz
Lamp Type: 1 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 6-bit), 30 pins
Voltage: 3.3V
Brand: AKIRA, Model: LCT-15HE02ST.
Short from TV: LCD, 15 ", 1280x768, sound: 4 watts.
The composition uses MainBoard MK-D E248237 and LCD panel (matrix) B154EW01.
AKIRA LCT-15HE02ST TV with B154EW01 LCD, 15 "diagonal size, 16: 9 format. 200 cd / m² screen brightness is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 300: 1. Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal generation (graphic format) is performed in standards 480i, 480p, 576i, 576p.
The power of the sound system 4 W (2x2 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, audio x2, SCART, RGB, VGA. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
Overall dimensions: With stand 731x468x166 mm, Without stand 731x437x87 mm.
Attention! The AKIRA LCT-15HE02ST LCD TV panel B154EW01 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!