Technical description and composition of the TV SUPRA STV-LC2604WD, type of panel and applicable modules. The composition of the modules.SUPRA
Model: STV-LC2604WD
Chassis / Version: LS02
Panel: 26 inch
MainBoard: LS02
IC MainBoard: NJW1142 TDA7266 PS201 SVP-AX
Tuner: AFT7 / W103
STV-LC2604WD Specifications
SUPRA STV-LC2604WD
General recommendations for TV LCD repair
SUPRA TV made on LS02 chassis, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localization of the defect before the necessary measurements are taken. Electrolytic capacitors of filters with a swollen body, as well as ring cracks or a layer of coal on burned-out resistors formed in soldered terminals of heating elements, sometimes tell the repairman the causes of the malfunction and possible consequences.
In the absence of any signs of operability, when the SUPRA STV-LC2604WD does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power module. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip may also cause a breakdown of the power switch of the converter.
Sometimes the SUPRA STV-LC2604WD TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter of the backlight lamps, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including the power supply unit (power supply unit).
Inverter repair is difficult because in case of any malfunction or abnormal situation, even with uneven wear of the lamps, protection is triggered, which turns it off for fire safety. Diagnostics becomes impossible and you need to disable protection.
In cases of attempts to repair the motherboard, it is necessary to check the performance of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating. When repairing an MB board, you need to check its components NJW1142 TDA7266 PS201 SVP-AX, tuner AFT7 / W103. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
Attention! Users and owners of STV-LC2604WD TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> CHASSIS LS02 AKAI
The appearance of the MainBoard LS02 is shown in the figure below:LS02
Main features of SUPRA STV-LC2604WD device:
Installed matrix (LCD panel) 26 inches.
The required supply voltage for all nodes of the TV SUPRA STV-LC2604WD provides a switching power supply.
MainBoard - the main board (motherboard) is an LS02 module, using NJW1142 TDA7266 PS201 SVP-AX chips and others.
The AFT7 / W103 tuner provides reception of television programs and tuning to channels.
LCD TV SUPRA STV-LC2604WD with LCD, diagonal size 26 "(66 cm) 16: 9 format. The brightness of the screen is 500 cd / m², backlit by CCFL (EEFL) fluorescent lamps. Contrast - the ratio of maximum brightness to minimum brightness 1600: 1. It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic decomposition of 720p (HD Ready). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation is in standards 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: MP3, MPEG4, VideoCD, SVCD, Picture CD.
The power of the sound system 10 W (2x5 W) provide two speakers. The 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), AV, S-Video, component, SCART x2, RGB, VGA, HDMI x2. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV in operating mode from the network is 120 watts.
Overall dimensions: 732x610x195 mm.
TV weight: 15 kg.
Attention! The SUPRA STV-LC2604WD LCD TV panel is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen surface to avoid permanent damage to the LCD panel!