Technical description and composition of the TV SUPRA STV-LC1677WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC1677WL
Chassis / Version: CV181L-A
Panel: 720p HD, 1366x768
MainBoard: CV181L-A
IC MainBoard: Flash W25Q32
Technical Specifications STV-LC1677WL
SUPRA STV-LC1677WL
General repair guidelines for TV LCD LED
Any repair usually begins with an external inspection. 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. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In the absence of any signs of operability, when the SUPRA STV-LC1677WL does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power module. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power switch (s) of the converter.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the SUPRA STV-LC1677WL TV does not have an image, but there is sound, there may be a malfunction in the LED backlight circuits of the 720p HD, 1366x768 panel. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for excessive ESR.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
When trying to identify a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
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 board (SSB), you must check the health of its elements - Flash W25Q32 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).
It should be remembered! Attempts to repair the TV SUPRA STV-LC1677WL, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1677WL, Main: CV181L-A, Panel: 720p HD, 1366x768
The appearance of the MainBoard CV181L-A is shown in the figure below:CV181L-A
As part of the CV181L-A motherboard, a multifunctional processor MST6M181VS is used, combined with a scaler (video controller-scaler). It is advisable to start the MainBoard repair by checking the power supply of the Stand-by mode, which is implemented using a separate 3.3V linear stabilizer. In operating mode, it is necessary to check the operability of linear stabilizers or voltage converters necessary to provide power to the processor nodes: 1.2V, 2.5V, 3.3V. A voltage of 2.5 V is required to power the DDR W9425G6JH-4 random access memory. If there is no image, but the display backlight is working properly, it is advisable to measure the power of the 5V or 12V LCD panel, depending on the type of panel used, directly on the LVDS connector. If the TV does not exit Stand-by mode, does not respond to the remote control and control buttons, you should check the 3.3V power at pin 8 of the SPI FLASH chip, it may be necessary to update its software.CV181L-A can be used in TVs:
FUSION FLTV-19T9D (Panel TB190B1Z1), FUSION FLTV-22T9D (Panel HM215WU1-500), HYUNDAI H-LED22V16 (Panel M215HW01 V.B), HYUNDAI H-LED15V6 (Panel LP156WD1 (TL)(A1)), SUPRA STV-LC2277FLD (Panel HK215LEDM-BH 1H), SUPRA STV-LC2425WL (Panel M240HW02 V.1), SUPRA STV-LC1677WL (Panel 720p HD 1366x768).
Main features of the SUPRA STV-LC1677WL device:
Installed matrix (LED-panel) 720p HD, 1366x768.
The required supply voltage for all nodes of the TV SUPRA STV-LC1677WL provides a switching power supply.
MainBoard - the main board (motherboard) is a CV181L-A module, using Flash W25Q32 chips and others.
LED TV SUPRA STV-LC1677WL with LCD HK156WL, diagonal size 16 "(41 cm) 16: 9 format. The required brightness of the screen is 250 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 600: 1. Dynamic contrast of 12000: 1 is achieved by special control of the LEDs depending on the illumination of the plots in the plot.This model uses an LED panel with an end-face arrangement of the backlight LEDs - Edge LED. You can watch programs and movies and images in high quality at 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound 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, SCART, 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, 1360x768.
Overall dimensions: With stand 410x321x190 mm, Without stand 580x402x84 mm.
Mass of the TV: 3.4 kg.
Attention! The HK156WL panel of a SUPRA STV-LC1677WL 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.