Technical description and composition of the SUPRA STV-LC1503 TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1503
Chassis / Version: MST718BE
Panel: 15 inch
MainBoard: MST718BE
IC MainBoard: MST718BE TDA9886 STV82X7-80 NC / PT2314 TDA1517P
Tuner: F07WP-3BER-E
STV-LC1503 Specifications
SUPRA STV-LC1503
General recommendations for TV LCD repair
It is advisable to start repairing a SUPRA TV with a chassis with a careful external examination of both internal and external elements. Often, for certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain circuit elements even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Charred paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering on the leads of heating elements or transformers can often suggest the causes of the defect and possible consequences.
If the TV does not turn on, none of the indicators on its front panel are on or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes a problem with similar manifestations can occur only in the absence of processor power, which is typical for certain SUPRA models. In general, first of all, it is necessary to check the electrolytic capacitors of the filters of the secondary rectifiers and the fuse at the mains input. If it is cut off, then the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate heatsink or integrated with a PWM controller into a common microcircuit, should be checked for a breakdown of PN junctions. Options are possible.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
In cases where the SUPRA STV-LC1503 TV has lost the image, but there is sound and all other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight lamps). When you turn on the TV, the image may appear briefly and disappear immediately. It should be borne in mind that with such manifestations, the lamps themselves fail, the malfunction of which can be detected by replacing, connecting for diagnostics to the connectors that are known to be serviceable and suitable in power.
Often attempts to repair the inverter are hampered by the fact that the diagnosis of a malfunction is complicated by the work of its protection, which is designed to turn off the inverter in emergency modes - when lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Blocking protection for localizing a defect is popular among repairmen.
In cases of attempts to repair the MST718BE 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. Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing components MST718BE TDA9886 STV82X7-80 NC / PT2314 TDA1517P requires the necessary training and professional skills to repair modules at the component level. Problems associated with BGA soldering technologies can be diagnosed by the warm-up method.
Owners of the STV-LC1503 TV are advised to contact only qualified specialists with experience for repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MST718BE
The appearance of the MainBoard MST718BE is shown in the figure below:MST718BE
MST718BE can be used in TVs:
AKAI LTA-15E304 (Panel SVA150XG04TB), SUPRA STV-LC1503 (Panel 15 inches).
Main features of SUPRA STV-LC1503 device:
Installed matrix (LCD panel) 15 inches.
The required supply voltages for all nodes of the SUPRA STV-LC1503 TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is an MST718BE module, using MST718BE TDA9886 STV82X7-80 NC / PT2314 TDA1517P chips and others.
The F07WP-3BER-E tuner provides television reception and channel tuning.
LCD TV SUPRA STV-LC1503 with LCD, 15 "diagonal, 16: 9 format. Screen brightness of 250 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast - ratio of maximum brightness to minimum brightness is 500: 1. It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in 720p (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation takes place in 480i standards, 480p, 576i, 576p.
The power of the speaker system of sound 4 W (2x2 W) provide two speakers. The NICAM STEREO audio processing system is used.
An external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, S-Video, component, VGA. A headphone output 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.
The power consumed by the TV in operating mode from the network is 48 watts.
Overall dimensions: With a support 1125x812x204 mm, Without a support 1054x791x120 mm.
Attention! The SUPRA STV-LC1503 LCD TV panel is the most expensive component.
Avoid hitting the glass and pressing on the screen surface to avoid irreversible damage to the LCD panel!