Technical description and composition of the SUPRA STV-LC2725FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC2725FL
Chassis / Version: CV182H-K
Panel: LTM270HT03
LED driver (backlight): integrated into PSU
PWM LED driver: OB3370NCP
MOSFET LED driver: AOD417, ME45P04
Power Supply (PSU): LK-PL270401A
PWM Power: GR8876A
MOSFET Power: ME15N10-G
MainBoard: CV182H-K
IC MainBoard: CPU: MST6M181 / 182, Flash: EN25Q32, Audio: TPA3110D2
Tuner: F03WT-3DDR-E
STV-LC2725FL Specifications
SUPRA STV-LC2725FL
General recommendations for TV LCD LED repair
Diagnostics of malfunctions and repair of SUPRA STV-LC2725FL, like other electronic devices, it 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. 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 STV-LC2725FL TV does not turn on, does not make any sounds when turned on, as well as no indicators on the front panel light up or blink, there is a high probability of a malfunction in the power module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some SUPRA models. 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 the 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.
It should be remembered that in the practice of repair, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dry electrolytic capacitors or broken resistors in the primary circuit, or the PWM controller microcircuit itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If SUPRA STV-LC2725FL does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the LED circuit of the LTM270HT03 panel backlight, or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power supply filter of the LED driver itself, including in the secondary rectifier of the main power supply unit.
To check the health of the LEDs, as well as the contact connections in the ruler circuit, the panel must be disassembled.
To check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
Repair or diagnostics of the CV182H-K motherboard should begin with checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
In cases of complex repairs of MB (SSB) and with the necessary skills and equipment, it may sometimes be necessary to replace its chips CPU: MST6M181 / 182, Flash: EN25Q32, Audio: TPA3110D2 and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
If you suspect a malfunction of the tuner -F03WT-3DDR-E, first of all you need to make sure that there is a supply voltage at the corresponding output of the tuner.
Owners and users of the SUPRA STV-LC2725FL TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2725FL, Main: CV182H-K, Panel: LTM270HT03
The appearance of the MainBoard CV182H-K is shown in the figure below:CV182H-K
CV182H-K can be used in TVs:
SUPRA STV-LC2725FL (Panel LTM270HT03), SUPRA STV-LC4225FL (Panel TC420F115).
External view of the power supply
Main features of SUPRA STV-LC2725FL device:
The matrix (LED-panel) LTM270HT03 is installed.
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the OB3370NCP PWM controller. The keys of the type AOD417, ME45P04 are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2725FL TV is carried out by the LK-PL270401A power module, or its analogs using GR8876A microcircuits and ME15N10-G power switches.
MainBoard - the main board (motherboard) is a CV182H-K module, using CPU chips: MST6M181 / 182, Flash: EN25Q32, Audio: TPA3110D2 and others.
The F03WT-3DDR-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM270HT03
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 597.6x336.15 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 16S4P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC2725FL with LCD display LTM270HT03, diagonal size 27 "(69 cm) 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 70,000: 1 is achieved by special LED control depending on the illumination of the areas in the scene.This model uses an LED panel with an edge LED backlighting - Edge LED.The TV capabilities provide viewing of programs and films in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported multimedia file formats: MP3, MPEG4, JPEG.
Speaker power 20 W (2x10 W) is provided by 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, component, SCART, 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, 1280x1024, 1360x768.
The power consumed by the TV in operating mode from the network is 60 watts.
Overall dimensions: 810x485x150 mm.
TV weight: 7.3 kg.
Attention! The LTM270HT03 panel of the SUPRA STV-LC2725FL 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 unrepairable ................................ ..