Technical description and composition of the SUPRA STV-LC2677WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC2677WL
Chassis / Version: V3L01
Panel: HT260WX2-101
LED driver (backlight): LKP-LE017
PWM LED driver: MP3389EF
Power Supply (PSU): LK-OP407501A
MainBoard: T.MS6M48.3B 10423
IC MainBoard: CPU: MST6E48RHS, Sound: R2A15122, BL3257, Flash: 25Q32BVSIG, Ram: H5PS5162FFR
Tuner: TDQ-ATF27WT-F
STV-LC2677WL Specifications
SUPRA STV-LC2677WL
General recommendations for TV LCD LED repair
SUPRA STV-LC2677WL TV, like many other electronic devices, it is advisable to start repairing with an inspection of all external and internal elements. Often, according to certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before taking the necessary measurements, which will make it possible to determine a further algorithm for troubleshooting and localizing a defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred layer of paint on the resistors - all this for the repairman can be a significant clue in assumptions about the causes and consequences of a malfunction.
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 emit any sounds and any signs of operability when turned on, there is a certain probability that the LK-OP407501A power supply module is faulty and it needs repair. Sometimes a problem with similar manifestations can occur only in the absence of processor power, which is typical for certain SUPRA models. It is advisable to start diagnostics of the power supply module by checking the condition of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in a breakdown state in such situations.
In most cases, breakdowns of keys in switching power supplies (SMPS) do not occur without reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as broken resistors or punctured semiconductor elements in the stabilization circuits. Possible defect of the PWM chip from the manufacturer.
Power module RS078D-4T02 and voltage values at test points:
RS078D-4T02
Sometimes the SUPRA STV-LC2677WL TV does not have a picture, but there is sound, or the picture appears and disappears immediately. In this case, there is a high probability of a malfunction of the HT260WX2-101 panel backlight LED converter, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the LED driver itself, including the power supply unit (power supply unit).
A malfunction in the backlight circuits often occurs due to an open circuit in the power supply circuit of the LED lines. It is required to disassemble the panel and check the LEDs themselves, the ration of their outputs, as well as the reliability of the connections in the connectors and the ration of the connector pins.
An open circuit in the LED lines connected in series can not be detected with a multimeter or tester without disassembling the panel. It takes several tens of volts to open all the junctions, and it is best to use a current source for such purposes.
The motherboard T.MS6M48.3B 10423 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software.
When repairing an MB board, you need to check its components CPU: MST6E48RHS, Sound: R2A15122, BL3257, Flash: 25Q32BVSIG, Ram: H5PS5162FFR. Defective elements must be replaced. If BGA chips are installed, their failure is usually localized by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the varicaps of the TDQ-ATF27WT-F tuner, which is usually in the range of 30-33V, as well as other supply voltages at the tuner outputs.
MainBoard T.MS18VG.81B 1245 appearance and voltage values at test points:T.MS18VG.81B_1245
Attention! Users and owners of STV-LC2677WL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2677WL ver.V3L01, Main T.MS6M48.3B 10423, Panel HT260WX2-101
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2677WL V5L11, T.MS18VG.81B 12145, Panel V260B3-P09
Version V5L11 - panel V260B3-P09, T-CON V260B3-XC09 CM1801B CM501 CM601 SPP4436
MAIN: T.MS18VG.81B 12145 - FLASH: W25Q32FVS, TPA3110D2, IT6633E-P
TUNER: CDT-3SP512-36
PSU & INVERTOR: RS078D-4T02
Power: LD7750RGR, Field workers: ME60N03A, ME12P04, GSB7N0809
INVERTER: MP3394, Field workers: UNS400P84-2pcs, ME15N10-G.
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.
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analog OB3362VP (28 pin), the total resistance of the resistors from pin 9 (ISET) to the case should be proportionally increased. The maximum current in each of the 12 channels (in milliamperes) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. When the channels are connected in parallel, the currents are summed up.Additional MainBoard Repair
The appearance of the MainBoard T.MS6M48.3B is shown in the figure below:
T.MS6M48.3B
T.MS6M48.3B can be used in TVs:
SUPRA STV-LC3277WL (Panel CH315BT-A02 rev.01 ROHS), SUPRA STV-LC2677WL (Panel HT260WX2-101).
Main features of SUPRA STV-LC2677WL device:
Installed matrix (LED panel) HT260WX2-101.
The LED driver LKP-LE017 is used to power the backlight LEDs, it is controlled by the PWM controller MP3389EF.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2677WL TV is carried out by the LK-OP407501A power module, or its analogs.
MainBoard - the main board (motherboard) is a T.MS6M48.3B module, using chips CPU: MST6E48RHS, Sound: R2A15122, BL3257, Flash: 25Q32BVSIG, Ram: H5PS5162FFR and others.
The TDQ-ATF27WT-F tuner provides reception of television programs and tuning to channels.
Information from an alternative source:
SUPRA STV-LC2677WL Version V5L11
Panel type (matrix): V260B3-P09
Motherboard: T.MS18VG.81B 1245, FLASH: W25Q32FVS, TPA3110D2, IT6633E-P, Tuner: CDT-3SP512-36
T-con: V260B3-XC09, CM1801B, CM501, CM601, SPP4436
PSU & Invertor: RS078D-4T02, LD7750RGR, ME60N03A, ME12P04, GSB7N0809, MP3394, PA210HV х2, ME15N10-G
Additional technical information about the panel:
Brand: BOE
Model: HT260WX2-101
Type: a-Si TFT-LCD, CELL
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 7.05% (with Polarizer)
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LED TV SUPRA STV-LC2677WL with LCD display HT260WX2-101, diagonal size 26 "(66 cm) 16: 9 format. 800: 1 Dynamic contrast ratio of 16000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the scene.The display technology of the model uses LED LED backlighting.It is possible to view programs and films and images in high quality HD at a resolution of 1366x768 pixels in the graphic standard 720p resolution (HD Ready) Input high-frequency 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 media file formats: MP3 , WMA, MPEG4, MKV, 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 x2, USB x2. 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, 1360x768.
The power consumed by the TV in operating mode from the network is 80 watts.
Overall dimensions: 653x407x209 mm.
TV weight: 5.9 kg.
Attention! The panel HT260WX2-101 of the SUPRA STV-LC2677WL LED TV is an expensive and unreliable element.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV non-repairable.