Technical description and composition of the SUPRA STV-3239W TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-3239W STV-LC3239W
Chassis / Version: V1K11
Panel: LTA320AN01
Inverter (backlight): integrated into PSU
Trans Inverter: LKT-083
Power Supply (PSU): LK-PI320402E
PWM Power: OB2273
MainBoard: CV182H-J
IC MainBoard: CPU: MST6E182VS-LF-Z1, Flash: 25Q32
Tuner: QINGJIA AFT7 / W110G
Control: IR: RMT062-1
Appearance
SUPRA STV-3239W
General recommendations for TV LCD repair
It is advisable to start repairing all electronic devices, including the SUPRA TV, based on the V1K11 chassis, with an external examination of its external and internal elements. Sometimes, based on the visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements begin. Experienced repairers often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external indirect signs.
If the TV does not turn on, none of the indicators on its front panel are on 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 a problem with similar manifestations can occur only 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 borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
If, when the TV is turned on, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (backlight power converter). In such cases, the lamps, the inverter and the common power module must be checked, in which the electrolytic capacitors of the rectifier filter supplying the inverter must be checked. When turning off the protection in order to ensure the possibility of diagnosing a malfunction, special care should be taken, and after all repair work is completed, it is imperative to restore the circuits and the operation of the inverter protection for the further safe operation of the TV.
Repair or diagnostics of the CV182H-J motherboard should begin with checking the stabilizers or power converters of its microcircuits. If necessary, update the software (software). Often the MB (SSB) board needs to be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MST6E182VS-LF-Z1, Flash: 25Q32 and replace the failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Attention! Users and owners of STV-3239W TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC3239W V1K11, MAIN:CV182H-J, PANEL: LTA320AN01
If a failure occurs in the SPI FLASH software produced by Winbond, we recommend changing the microcircuit to a new one. Often unreadable Winbond microcircuits can temporarily restore their functionality after a strong temperature effect, for example, warming up with a soldering station or a lighter. Sometimes this is enough to read its regular contents.
Repair MainBoardThe appearance of the MainBoard CV182H-J is shown in the figure below:
CV182H-J
CV182H-J can be used in TVs:
SUPRA STV-3239W STV-LC3239W (Panel LTA320AN01), SUPRA STV-LC3239W (Panel V315B5-L10), SUPRA STV-LC3239F (Panel LTA320HN02).
External view of the power supply
Main features of the SUPRA STV-3239W device:
Installed matrix (LCD panel) LTA320AN01.
To power the backlight, a converter is used, combined with the power supply. A transformer LKT-083 is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the TV SUPRA STV-3239W is carried out by the power module LK-PI320402E, or its analogues using OB2273 chips.
MainBoard - the main board (motherboard) is a CV182H-J module, using CPU chips: MST6E182VS-LF-Z1, Flash: 25Q32 and others.
The QINGJIA AFT7 / W110G tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AN01-D
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 20 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V