Technical description and composition of the SUPRA STV-LC32T840WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32T840WL
Chassis / Version: HL T57EJ
Panel: C320X14-E12-H
T-CON: MT3151A05-5-XC-5
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251A
MOSFET Power: 70R600P
MainBoard: JUC7.820.00130484 HLT57EJ 2015-06-11
IC MainBoard: CPU MSMHFK 9206B, Flash 25Q64
Tuner: CH DM121 C816RH
STV-LC32T840WL Specifications
SUPRA STV-LC32T840WL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SUPRA STV-LC32T840WL does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
A malfunction in such cases should be looked for in the elements of the power source - the mains voltage converter (AC / DC), which is located on the MainBoard JUC7.820.00130484. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (70R600P) and rectifier diodes in the converters for a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) NCP1251A, if they have no visible damage to the case and an outright short circuit between the pins, are usually checked by replacing.
- There is no image, the screen is black, there is sound, when the screen is illuminated outside, you can sometimes see barely noticeable outlines of the image.
In some of these cases, the malfunction is caused by the lack of display backlighting. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
Without a special current source, it is impossible to check the line of series-connected LEDs, and it is unsafe for them to use any voltage sources over 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Typically, Chinese multimeters with a 9V power supply lightly light up one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, and the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or broken into the K / Z.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the JUC7.820.00130484 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its CPU MSMHFK 9206B, Flash 25Q64 chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
In cases where there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the CH DM121 C816RH tuner terminals match. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
We remind users again! Attempts to self-repair the SUPRA STV-LC32T840WL TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32T840WL HL T57EJ, Main: HL T57EJ, Panel: C320X14-E12-H
The appearance of the MainBoard JUC7.820.00130484 is shown in the figure below:JUC7.820.00130484
Main features of SUPRA STV-LC32T840WL device:
The matrix (LED-panel) C320X14-E12-H is installed.
Matrix control uses Timing Controller (T-CON) MT3151A05-5-XC-5.
To power the backlight LEDs, a converter combined with the JUC7.820.00130484 main board is used, controlled by the MP4012 PWM controller. TO-252 switches are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback converter circuit using NCP1251A microcircuits and 70R600P power switches.
MainBoard - the main board (motherboard) is a JUC7.820.00130484 module using CPU MSMHFK 9206B, Flash 25Q64 and others.
Tuner CH DM121 C816RH provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32T840WL with LCD C320X14-E12-H, 32 "(81 cm) 16: 9. special control of the LEDs depending on the illumination of areas in the scene. The display technology of the model uses LED LED backlight. It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping occurs in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power of 16 W (2x8 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x3, USB. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 820x530x160 mm.
Attention! SUPRA STV-LC32T840WL LED TV panel C320X14-E12-H 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 non-repairable.