Technical description and composition of the TV SUPRA STV-LC16741WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC16741WL
Chassis / Version: CVMV29L-F
Panel: NT156WHM-N12
MainBoard: CVMV29L-F
IC MainBoard: CPU TSUMV59XU-Z1, Flash 25Q32
Tuner: CDT-3NP5i1-10
Technical Specifications STV-LC16741WL
SUPRA STV-LC16741WL
General repair guidelines for TV LCD LED
Any repair usually begins with an external inspection. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. In most cases, the repairman can guess the causes of the defect and possible consequences from the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of the element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
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 probability that the power 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. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
It should be remembered that in the practice of repair, usually the 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 cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip 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 the SUPRA STV-LC16741WL has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the NT156WHM-N12 panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
Repair of the CVMV29L-F motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU TSUMV59XU-Z1, Flash 25Q32. Defective components should be replaced.
The malfunction of the tuner CDT-3NP5i1-10 is established after checking the software and all supply voltages at its terminals.
Attention! Users and owners of STV-LC16741WL TVs who do not have the appropriate qualifications, knowledge and experience are strongly advised against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CVMV29L-F
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC16741WL, Main: CVMV29L-F, Panel: NT156WHM-N12
The appearance of the MainBoard CVMV29L-F is shown in the figure below:CVMV29L-F
CVMV29L-F can be used in TVs:
DEXP H24C3000E (Panel CX236DLEDM), DEXP H16B3000ED (Panel N156BGE-L21), DEXP F22B3000E (Panel T215HVN01.1 CX215LEDM), DEXP 16A3000 (Panel N156BGE-L2 1366x768 WXGA ), DEXP 19A3000 (Panel CX185LEDM), DEXP 22A7000 (Panel CX215LEDM), MYSTERY MTV-1628LW (Panel N156BGE-L21), MYSTERY MTV-1629LW (Panel N156BGE-L21), SUPRA STV-LC16741WL (Panel NT156WHM-N12), SUPRA STV-LC16740WL (Panel LTN156AT32).
Main features of the SUPRA STV-LC16741WL device:
Installed matrix (LED-panel) NT156WHM-N12.
The required supply voltage for all nodes of the TV SUPRA STV-LC16741WL provides a switching power supply.
MainBoard - the main board (motherboard) is a CVMV29L-F module, using CPU chips TSUMV59XU-Z1, Flash 25Q32 and others.
The tuner CDT-3NP5i1-10 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: NT156WHM-N12 18 Compatible model
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Shape Style: Flat (PCBA Flat, Depth 3.4 ~ 4.0mm)
Surface: Glare (Haze 0%)
Brightness: 200 cd / m²
Contrast Ratio: 500: 1
Display Colors: 262K (6-bit), CIE1931 45%
Response Time: 12 (Tr + Td)
Frequency: 60Hz
Lamp Type: 9S4P WLED Embedded (LED Driver)
Signal Interface: eDP (1 Lane), 30 pins
Voltage: 3.3V
LED TV SUPRA STV-LC16741WL with LCD display NT156WHM-N12, diagonal size 16 "(41 cm) 16: 9 format. The required brightness of the screen 200 cd / m² is provided by LED backlight LED. Dynamic contrast ratio of 40,000: 1 is achieved by special control LEDs work depending on the illuminated areas in the plot.In this model, an LED panel with the end position of the backlight LEDs, Edge LED, is used. The input high-frequency or video signal is decoded in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX , MKV, JPEG.
The power of the sound system 6 W (2x3 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, audio x2, component, VGA, HDMI, USB. 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, 1360x768.
Overall dimensions: 738x495x210 mm.
Mass of the TV: 6.6 kg.
Attention! The NT156WHM-N12 panel of a SUPRA STV-LC16741WL 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.