Technical description and composition of the SUPRA STV-LC40T880FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40T880FL
Chassis / Version: HLT57EJ
Panel: C400F14-E7-C (G2)
LED backlight: GDCH40LB06 LED3030
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: MMD14N25
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251 (PWM SOT23-6)
MainBoard: JUC7.820.00123957 HLT57EJ
IC MainBoard: CPU: 9206B, SPI Flash: GD25Q64, TPA3110D
Tuner: CH DM121 C816RH
STV-LC40T880FL Specifications
SUPRA STV-LC40T880FL
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV SUPRA STV-LC40T880FL does not turn on and does not show any signs of operation at all. No response to the remote control and front panel control buttons.
First of all, in such cases, you should make sure that the common switching power supply (SMPS) - the AC / DC voltage converter of the mains voltage - is working. All source elements in this TV model are located on the MainBoard JUC7.820.00123957. Its output voltages should be measured and, in their absence, the serviceability of the power switches and rectifier diodes in the converters should be checked for possible breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) NCP1251 (PWM SOT23-6) are usually checked by replacing them with new ones, or knowingly working.
- 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.
Most likely in these cases is a malfunction of the LED backlight. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or breakage), sometimes in the violation of the contact connections of the LED strips.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light a single 3V LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off, or pierced in the K / Z.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the JUC7.820.00123957 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). Complex repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements CPU: 9206B, SPI Flash: GD25Q64, TPA3110D. Malfunctions in BGA chips are usually easy to detect by warm-up.
Before changing the CH DM121 C816RH tuner, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Users and owners of TVs should remember that attempts to self-repair a SUPRA STV-LC40T880FL TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40T880FL, Main: JUC7.820.00123957 HLT57EJ, Panel: C400714-E7-C (G2)
The appearance of the MainBoard JUC7.820.00123957 is shown in the figure below:JUC7.820.00123957
JUC7.820.00123957 can be used in TVs:
DEXP F40B7200C (Panel C400F14-E6-C (G5)), SUPRA STV-LC40T440FL (Panel C400F15-E2-S (G01)), SUPRA STV-LC40T800FL (Panel C400F14-E8-C).
Main features of SUPRA STV-LC40T880FL device:
Installed matrix (LED panel) C400F14-E7-C (G2).
To power the backlight LEDs, a converter combined with the JUC7.820.00123957 main board is used, controlled by the MP4012 PWM controller. The keys of the MMD14N25 type 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 voltage converter using NCP1251 microcircuits (PWM SOT23-6).
MainBoard - the main board (motherboard) is a JUC7.820.00123957 module, using CPU chips: 9206B, SPI Flash: GD25Q64, TPA3110D and others.
Tuner CH DM121 C816RH provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC40T880FL with LCD C400F14-E7-C, diagonal 40 "(102 cm) in 16: 9 format. The required screen brightness of 320 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 100,000: 1 is achieved special control of the LEDs depending on the illumination of areas in the scene. The display technology of the model uses LED LED backlight. The TV's capabilities provide for viewing broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). 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 multimedia 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, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 1010x640x160 mm.
Attention! Panel C400F14-E7-C (G2) SUPRA STV-LC40T880FL LED TV 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.