Technical description and composition of the TV SUPRA STV-LC2455FL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC2455FL
Chassis / Version: V1K03
Panel: V236H1-LE2
LED driver (backlight): integrated into MainBoard
PWM LED driver: A8504
Power Supply (PSU): PW52057 B
MainBoard: JUG7.820.699-2
IC MainBoard: CPU: TSUMV26KE-LF
Tuner: CDT-3LC4I1-00
Technical Specifications STV-LC2455FL
SUPRA STV-LC2455FL
General repair guidelines for TV LCD LED
Repair of the SUPRA STV-LC2455FL TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the TV does not turn on, no indicators on its front panel are lit 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 chance that the PW52057B power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, which is typical for certain SUPRA models. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the network rectifier, as well as the large electrolytic capacitor of the filter of the network rectifier.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
If there is no image when you turn on the SUPRA STV-LC2455FL, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the V236H1-LE2 panel, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It is impossible to detect a break in the line of LEDs without disassembling the panel with a simple multimeter. LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: TSUMV26KE-LF which may require replacement with new ones. If the BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner CDT-3LC4I1-00, if it is not possible to tune to television channels, make sure that there are supply voltages, including varicap supply (30-33V), which must be measured on the corresponding tuner pins.
Remember! Attempts to self-repair by users of the SUPRA STV-LC2455FL TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
The appearance of the MainBoard JUG7.820.699-2 is shown in the figure below:JUG7.820.699-2
JUG7.820.699-2 can be used on TVs:
AKAI LEA-22C05P (Panel CLAA215FA04), SUPRA STV-LC2435FL (Panel V236H1-LE2 Ver C1), SUPRA STV-LC2235FL (Panel M215HW01), SUPRA STV-LC2455FL (Panel V236H1-LE2), SUPRA STV-LC1935WL (Panel M185XW01 V6), SUPRA STV-LC2255FL (Panel M215HW01 V6).
The appearance of the power supply
Main features of the SUPRA STV-LC2455FL device:
Installed matrix (LED-panel) V236H1-LE2.
To power the backlight LEDs, a converter is used, combined with the main board JUG7.820.699-2, controlled by the A8504 PWM controller.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2455FL TV is carried out by the PW52057 power module, or its analogues.
MainBoard - the main board (motherboard) is a JUG7.820.699-2 module, using CPU chips: TSUMV26KE-LF and others.
The tuner CDT-3LC4I1-00 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V236H1-LE2
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 70%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S8P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC2455FL with LCD V236H1-LE2, diagonal size 24 "(61 cm) 16: 9 format. The required brightness of the screen 300 cd / m² is provided by LED backlight LED. Dynamic contrast 4000: 1 is achieved by special control LEDs work depending on the illuminated areas in the plot. The model’s display technology uses LED LED backlighting. TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the 1080p standard (Full HD). Input high-frequency or video signal decoded in analog systems PAL, SECAM, NTSC .. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 4 W (2x2 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI. An output for connecting headphones 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 the operating mode from the network is 40 watts.
Overall dimensions: 624x434x120 mm.
Mass of the TV: 6.3 kg.
Attention! The V236H1-LE2 panel of a SUPRA STV-LC2455FL LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.