Technical description and composition of the SUPRA STV-LC1910W TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1910W
Chassis / Version: V1I12
Panel: HT185WX1-100
Inverter (backlight): IP32031 REV: 01
PWM Inverter: TL494
MOSFET Inverter: AO4516
Power Supply (PSU): IP32031 REV: 01
PWM Power: LD7575 (PWM flyback)
MOSFET Power: SVD4N65F
MainBoard: JUG7.820.510-5
IC MainBoard: CPU: MST718BE-LE, Flash: 25F40, EEprom: 24C32B
Tuner: TAF6-C2121VH
STV-LC1910W Specifications
SUPRA STV-LC1910W
General recommendations for TV LCD repair
Diagnostics of malfunctions and repair of SUPRA with V1I12 chassis, like other electronic devices, is recommended to begin with an external examination of external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of troubleshooting. Experienced repairmen 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 burnt out to coal dust and other external indirect signs.
Sometimes the SUPRA STV-LC1910W TV just won't turn on. No control lamps on the front panel are on or blinking, the TV does not respond to the remote control and does not emit any sounds or any signs of life when turned on. The most likely cause of the failure is failure of the general power supply module IP32031 REV: 01. If it works, check the processor batteries on the SSB (Main Board). When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, the power elements of the SVD4N65F transistors and the rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (SMPS) it does not fail by itself without reasons that should be looked for by checking other elements of the primary circuit - electrolytic capacitors, PWM controller LD7575, which can be checked only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Sometimes the SUPRA STV-LC1910W TV does not have a picture, but there is sound, or the picture appears and disappears immediately. In this case, there is a high probability of a malfunction of the backlight converter, or the lamps themselves, which can be checked by replacing. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including the power supply unit (power supply unit). It must be borne in mind that in the event of a disconnection of the inverter protection (for the purpose of diagnostics) there is a risk of failure of the power elements of the inverter and take special care. After carrying out repair work, the protection circuits must be restored for the further safe operation of the TV.
The SUPRA STV-LC1910W has no picture when a signal is present, often caused by a malfunctioning display backlight. Moreover, the problem can be both inside the LCD-panel (matrix) HT185WX1-100, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the HT185WX1-100 LCD panel - a painstaking process that requires special attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But often the main board MainBoard JUG7.820.510-5 also turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for the line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within the normal range, then the oscilloscope must track the passage of LVDS signals from MainBoard JUG7.820.510-5, as well as synchronizing signals from T-CON to loops with drivers.
Repair of the JUG7.820.510-5 motherboard must begin with diagnostics and testing of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU: MST718BE-LE, Flash: 25F40, EEprom: 24C32B which may require replacement with new ones. If a BGA processor is installed, there is a possibility that the soldering of the contacts of its pins with the board is broken (detected by warming up).
We remind users again! Attempts to self-repair the SUPRA STV-LC1910W TV without the appropriate qualifications and experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> JUG7.820.510-2 MST718BE
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1910W, Cpu: TSUMV26KU-LF, Flash: F40-100G, Tuner: TAF6-C2121VH 0406BB, Audio: YD1517P, Power: IC101 - LD7575, U2 - AO4516, IC1 - TL494
The appearance of MainBoard JUG7.820.510-5 is shown in the figure below:JUG7.820.510-5
JUG7.820.510-5 can be used in TVs:
SUPRA STV-LC1504W (Panel HT156WX1-100), SUPRA STV-LC1910W (Panel HT185WX1-100).
Main features of SUPRA STV-LC1910W device:
Installed matrix (LCD panel) HT185WX1-100.
To power the backlight lamps, an IP32031 inverter is used, controlled by a TL494 PWM controller. The keys of the AO4516 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC1910W TV is carried out by the IP32031 power module, or its analogs using LD7575 microcircuits (PWM flyback) and power switches of the SVD4N65F type.
MainBoard - the main board (motherboard) is a JUG7.820.510-5 module, using CPU chips: MST718BE-LE, Flash: 25F40, EEprom: 24C32B and others.
The TAF6-C2121VH tuner provides reception of television programs and tuning to channels.
Information from an alternative source:
SUPRA STV-LC1910W Version V1I12
Panel type (matrix): HT185WX1-100
Motherboard: JUG7.820.510-5, MST718BE-LE, 25F40, 24C32B, Tuner: TAF6-C2121VH, PSU &
Invertor: IP32031 REV: 01, LD7575, SVD4N65F, AO4516, TL494
Additional technical information about the panel:
Brand: BOE
Model: HT185WX1-100
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
SUPRA STV-LC1910W LCD TV with HT185WX1-100 LCD, 19 "(48 cm) 16: 9 diagonal. Screen brightness of 300 cd / m² is provided by CCFL (EEFL) fluorescent lighting. Contrast is the ratio of maximum brightness to the minimum is 1000: 1. 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 formation digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the acoustic system of sound 4 W (2x2 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 x3, S-Video, component, VGA, HDMI. 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.
The power consumed by the TV in operating mode from the mains is 60 W.
Overall dimensions: 522x455x145 mm.
TV weight: 7.5 kg.
Attention! SUPRA STV-LC1910W LCD TV panel HT185WX1-100 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!