Technical description and composition of the SUPRA STV-LC2715FT TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC2715FT
Chassis / Version: V1J09
Panel: LM270WF1 (TL) (A1)
MainBoard: T.MSD309.8B
IC MainBoard: SPI FLASH W25Q32
Tuner: DT82WT-3R-E
STV-LC2715FT Specifications
SUPRA STV-LC2715FT
General recommendations for TV LCD repair
Diagnostics of malfunctions and repair of SUPRA with chassis V1J09, like other electronic devices, is recommended to begin with an external examination of the external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of troubleshooting. Swollen electrolytic or metal-ceramic capacitors, charred resistors, ring cracks in the soldering of the element leads - all this can significantly help the master to determine the causes and consequences of the malfunctions in the TV.
In the event of a power supply module failure, external manifestations may be different, for example, SUPRA STV-LC2715FT does not turn on at all and there is no indication of the control lamps on the front panel. With the same symptoms, the regulator (converter) of the control processor power supply may be faulty. The first step is to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse in the power supply is broken, in most cases a breakdown of the power switch (s) is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the mains rectifier filter.
Power switches in switching power supplies (SMPS) fail for no reason very rarely and, in case of their breakdown, it is necessary to look for a malfunction in the stabilization circuits, checking electrolytic capacitors, semiconductor devices and resistors in the primary circuit. The reason may be a malfunction of the PWM regulator microcircuit, which can only be checked by replacing it with a new or known good one.
If the SUPRA STV-LC2715FT TV does not have a picture, but there is sound, the malfunction should be looked for in the backlight power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overestimated ESR. All necessary precautions must be taken when disabling the inverter protection during diagnostics and do not leave it disabled after repair is completed.
If the motherboard T.MSD309.8B is faulty, first of all it is necessary to check all linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes it is possible to check the health of the MB only by replacing it. If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - SPI FLASH W25Q32. Defective components must be replaced.
Owners and users of the SUPRA STV-LC2715FT TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2715FT (V1J09), Main T.MSD309.8B, PANEL LM270WF1(TL)(A1)
In case of malfunctions in the SPI FLASH software produced by Winbond, we recommend changing the microcircuit itself to a new one. Sometimes Winbond microcircuits can recover for a while after high-temperature exposure, for example, warming up with a soldering station or a lighter, which is sometimes enough to read its contents.
Additional MainBoard RepairThe MainBoard T.MSD309.8B uses the MSD309B processor, DDRAM random access memory (RAM) in BGA design and SPI Flash ROM of 25Q32 type (4Mb).
It is advisable to start repairing the motherboard with checking the voltage converters and linear stabilizers necessary to provide power to the nodes in the operating and standby mode. The processor core is powered by + 1.5V. Also, the processor requires + 2.5V and + 3.3V voltages.
If the display backlight is working properly and there is no image, it is necessary to check the panel power supply (depending on the type, + 5V or + 12V), which is more convenient to measure directly at the LVDS connector. If, with all the supply voltages present, the TV does not go into operation, does not respond to the Remote Control and control buttons, you should update the SPI Flash firmware.
The appearance of the MainBoard T.MSD309.8B is shown in the figure below:
Main features of the SUPRA STV-LC2715FT device:
Installed matrix (LCD panel) LM270WF1 (TL) (A1).
The necessary supply voltages for all nodes of the SUPRA STV-LC2715FT TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a T.MSD309.8B module, using SPI FLASH W25Q32 chips and others.
The DT82WT-3R-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LM270WF1-TLA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 597.888x336.312 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 92%
Response Time: 1/4 (Tr / Td); 2 (G to G)
Frequency: 60Hz
Lamp Type: 7 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 12.0V
SUPRA LCD TV STV-LC2715FT with LCD LM270WF1 (TL) (A1), 27 "(69 cm) 16: 9. Brightness of the screen of 400 cd / m² is provided by backlighting CCFL (EEFL) fluorescent lamps. - The ratio of maximum brightness to minimum is 1000: 1. Dynamic contrast ratio of 4000: 1 is achieved by special control of the backlight. The capabilities of the TV provide viewing of programs and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). or video signal is decoded in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping takes place in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia file formats: MP3, MPEG4, JPEG.
Speaker power 12 W (2x6 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, VGA, HDMI x4, USB. A headphone output is provided. 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 digital tuner is capable of receiving TV channels in DVB-T MPEG4 standards.
The power consumed by the TV in operating mode from the network is 160 watts.
Overall dimensions: 673x505x200 mm.
TV weight: 8.6 kg.
Attention! The LM270WF1 (TL) (A1) panel of the SUPRA STV-LC2715FT LCD TV is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!
