Technical description and composition of the TV AKIRA LCT-32V82ST, type of panel and applicable modules. The composition of the modules.AKIRA
Model: LCT-32V82ST
Chassis / Version: JUG7.820.121 Ver1.01
Panel: V315B1-L01
T-CON: Gamma Buffer - AS15-G
Inverter (backlight): I315B1-16A
PWM Inverter: BA10324AF, OZ964GN
MOSFET Inverter: AO4614 (8)
Trans Inverter: 4013L 074596 KG-4
Power Supply (PSU): QAL0748-001 QAL0729-001
PWM Power: 203D6 (8), L6562D (PFC), KIA339F (14)
MainBoard: JUG7.820.121 Ver1.01
IC MainBoard: SVP AX68 7668 LF / 7632LF, A FBB02, QH8Y0, 0812 / TAIWAN, 20GFB803F525002, HY5DU281622FTP-4, TDA9886TS, 74HCT4052D, PS201, 74VLC14AD, 1411D, 24106464
Tuner: AFT7 / W103G
Technical Specifications LCT-32V82ST
AKIRA LCT-32V82ST
General recommendations for repairing TV LCD
Possible malfunctions
- AKIRA LCT-32V82ST 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.
In such cases, the fault should be sought first in the QAL0748-001 power supply module. It is necessary to measure the output voltages in the secondary circuits, 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip 203D6 (8), L6562D (PFC), KIA339F (14) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- 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.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the JUG7.820.121 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SVP AX68 7668 LF / 7632LF, A FBB02, QH8Y0, 0812 / TAIWAN, 20GFB803F525002, HY5DU281622FTP-4, TDA9886TS, 74HCT4052D, PS201, 74VLC14AD642, 1410, 1410, LAX, 1411D, 1111D replace chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Before changing the AFT7 / W103G 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
Attention to users! Self-repair of the AKIRA LCT-32V82ST TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
One of the typical defects of the AKIRA LCT-32V82ST TV option 1 may occur in the V315B1-l01 C2 panel.
External manifestations: color distortion in the image as a negative in the image, light tones predominate. Typically, in such cases, the AS15-G gamma corrector is faulty. Another indicator of its malfunction is an excessively strong heating, which in practice allows you to do without measuring voltage gradations of gray.
In most cases, replacing the AS15-G solves the problem.
It should be remembered that similar symptoms can cause faults in the column drivers of the panel, which is usually indicated by interference in the form of even vertical stripes on the screen. Then, after replacing the AS15-G, the situation does not change. Drivers are in loops and cannot be replaced. In this case, it is necessary to replace the glass panel.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> I315B1-16A I315B1-16A Inverter Schematic
The appearance of the MainBoard JUG7.820.121 is shown in the figure below:JUG7.820.121
PSU Advanced
The LCT-32V82ST model uses a QAL0748-001 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on the L6562D PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Key Features of the AKIRA LCT-32V82ST:
Installed matrix (LCD panel) V315B1-L01.
The matrix control uses the Gamma Timing Controller (T-CON).
To power the backlight, an inverter I315B1-16A is used, it is controlled by the PWM controller BA10324AF, OZ964GN. A transformer 4013L 074596 KG-4 is installed in the inverter converter. As power elements of the inverter, keys of the type AO4614 (8) are used.
The necessary supply voltages for all nodes of the TV AKIRA LCT-32V82ST are generated by the QAL0748-001 power module or its analogs using microcircuits 203D6 (8), L6562D (PFC), KIA339F (14).
MainBoard - the main board (motherboard) is a JUG7.820.121 module using SVP AX68 7668 LF / 7632LF, A FBB02, QH8Y0, 0812 / TAIWAN, 20GFB803F525002, HY5DU281622FTP-4, TDA9886TS, 1414C, 74DAD 24LC64, 25X80VSIG, LA42102 and others.
The AFT7 / W103G tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V315B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Brand: AKIRA, Model: LCT-32V82ST.
Short from TV: LCD, 32 "HDMI: 2.
The composition uses MainBoard JUG7.820.121 Ver1.01 and the LCD panel (matrix) V315B1-L01.
Power Supply Unit (PSU) QAL0748-001 QAL0729-001 Power Supply.
AKIRA LCT-32V82ST TV with V315B1-L01 LCD, 32 "(81 cm) diagonal size in 16: 9 format. Contrast - the ratio of maximum brightness to minimum is at least 1500: 1. The input high-frequency or video signal is decoded in analog PAL systems , SECAM, NTSC. Digital signal generation (graphic format) is performed in 480i, 480p, 576i, 576p, 720p, 1080i standards. Stereo sound is realized by two built-in speakers. NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), component, VGA, HDMI x2. 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-32V82ST LCD TV panel V315B1-L01 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!