Technical description and composition of the SUPRA STV-LC2625LF TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC2625LF
Chassis / Version: V1J08
Panel: V260H1-L03
LED driver (backlight): integrated into PSU
PWM LED driver: TL494
Power Supply (PSU): HTX-PI260202
PWM Power: LD7575
MOSFET Power: 5N60
MainBoard: T.MT8222.10B 10186
IC MainBoard: CPU: MT8222AHMU, Flash: WINBOND 25Q32BVSIG, Eeprom: FT24C32 SUPRA STV-LC2625LF Mine: T.MT8222.10B 10186 TDQ-6F6 / T126CW
Tuner: TDQ-6F6 / T126CW
STV-LC2625LF Specifications
SUPRA STV-LC2625LF
General recommendations for TV LCD LED repair
Possible malfunctions
- SUPRA STV-LC2625LF does not turn on, does not respond to control buttons and the remote control does not respond, indicators on the front panel do not light or flash.
Fault in such cases should be primarily sought in the circuits of the HTX-PI260202 power supply. First of all, it is necessary to measure the output voltages in its secondary circuits and, if they are completely absent, the serviceability of the power switches (5N60) and rectifier diodes should be checked for a possible breakdown (short circuit).
In case of breakdowns in the secondary circuits, the pulse converter, as a rule, can operate in a short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks off.
Mos-Fet keys used in SMPS usually fail due to a malfunction of other elements that can disable it in key mode, or provoke an excess of the maximum current or voltage values.
It is necessary to check the circuits supplying the PWM controller, damper or frequency setting circuits, or the elements of the Negative Feedback of the stabilization circuit.
PWM controllers of the LD7575 type, in the absence of external damage or an outright short circuit between the terminals, are checked by replacing them with a known good one.
- There is no picture, there is sound, the TV reacts to the remote control. The image may appear when turned on and disappear immediately.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlighting. The reason for this may be an open circuit in the LED circuit, or a malfunction in the stabilization of their power supply.
Without a special current source, it is impossible to check a line of series-connected LEDs, and using voltage sources for this purpose is extremely risky. In such cases, it is advisable to open the panel and check each LED separately. Typically, Chinese multimeters with a 9V power supply lightly light up one 3-volt LED if you connect the probes to it in the forward direction, the red probe to the anode, and the black one to the cathode.
For dual 6-volt LEDs, a serviceable PN junction of the emergency zener diode can serve as an indicator of serviceability. In the event of a malfunction of the LED, its zener diode will either be cut off, or in partial or complete breakdown (K / Z).
- The TV does not turn on, the indicator signals standby or operating mode, or flashes.
In such cases, there is a possibility that the T.MT8222.10B motherboard may malfunction. Its diagnosis should begin with checking the stabilizers and power converters of its microcircuits and matrix. Further, it is advisable to update or replace the software (software) SPI Flash WINBOND 25Q32BVSIG.
Failure of the TDQ-6F6 / T126CW tuner, in the absence of channel reception, is established after checking the software and all supply voltages at the tuner outputs. Its data exchange with the processor via the I2C bus can be monitored with an oscilloscope.
Owners and users of the SUPRA STV-LC2625LF TV should definitely 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!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2625LF V1J08, Main: T.MT8222.10B 10186, Panel: V260H1-L03
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2625LF V2K05, Main: T.MS6M48.7A 10423, Panel: TC260F103.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> HTX-PI260202 Power supply
STV-LC2625LF Option Ver: V2K05, Panel: TC260F103, Main Board: T.MS6M48.7A 10423, Spi Flash: MX25L3205, Ram, NT5TV32M16CG-25C, Tuner: ET-6T1E-LF-108W-A, T-Con: V260H1 -YC03, A / V Svitch: CBT3257AD, Hdmi: IT6633E-P, Audio: R2A15122FP, Remote: RC1W
The appearance of the MainBoard T.MT8222.10B is shown in the figure below:T.MT8222.10B
T.MT8222.10B can be used in TVs:
FUSION FLTV-32LF11 (Panel V315H4-LE2), SUPRA STV-LC2625LF (Panel V260H1-L03).
External view of the power supply
Main features of SUPRA STV-LC2625LF device:
Installed matrix (LED panel) V260H1-L03.
A converter combined with a power supply is used to power the backlight LEDs and is controlled by a TL494 PWM controller.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2625LF TV is carried out by the HTX-PI260202 power supply module, or its analogues using LD7575 microcircuits and 5N60 type power switches.
MainBoard - the main board (motherboard) is a T.MT8222.10B module, using CPU chips: MT8222AHMU, Flash: WINBOND 25Q32BVSIG, Eeprom: FT24C32 SUPRA STV-LC2625LF Mine: T.MT8222.10B 10186 TDQ-6W6 and T126C others.
The TDQ-6F6 / T126CW tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V260H1-L03
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 576x324 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.4 / 3.6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 1000: 1. Dynamic contrast ratio of 20,000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the scene. The model's display technology uses LED backlighting. The capabilities of the TV provide for viewing programs and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition at the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, JPEG.
Speaker power 16 W (2x8 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 x3, component, SCART x2, RGB, VGA, HDMI x3, USB. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV in operating mode from the network is 60 watts.
Overall dimensions: 645x458x180 mm.
TV weight: 7.1 kg.
Attention! SUPRA STV-LC2625LF LED TV panel V260H1-L03 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 unrepairable ...