Technical description and composition of the SUPRA STV-LC1914WD TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1914WD
Chassis / Version: V2K11
Panel: HT185WX1-501
MainBoard: JUG7.820.699-4
IC MainBoard: CPU: TSUMV26KE-LF, SPI FLASH: GD25Q40, EEPROM: 24C32. DVD - CPU: MT1389DE (JDAL), SPI FLASH: EN25F16, Pick: SOH-DL6.
Tuner: CH TAF6-C2121VH 1913BP
STV-LC1914WD Specifications
SUPRA STV-LC1914WD
General recommendations for TV LCD repair
Repairing a SUPRA TV with a V2K11 chassis should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Visible damage to elements can sometimes indicate the direction of searching for a defect even before the necessary measurements are taken. Elements with visible damage, for example, capacitors swollen after the electrolyte boils, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master guess about the causes and possible consequences of the malfunction.
If the power supply module fails, external manifestations may be different, for example, SUPRA STV-LC1914WD does not turn on at all and there is no indication of the control lamps on the front panel. With the same symptoms, the regulator (converter) of the control processor power supply may be faulty. In general, first of all, it is necessary to check the electrolytic capacitors of the filters of the secondary rectifiers and the fuse at the mains input. If it is cut off, then the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate radiator or integrated with a PWM controller into a common microcircuit, should be checked for PN-transitions breakdown. Options are possible.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur without reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as broken resistors or punctured semiconductor elements in the stabilization circuits. Possible defect of the PWM chip from the manufacturer.
In cases where the SUPRA STV-LC1914WD TV has lost the image, but there is sound and all other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight lamps). When you turn on the TV, the image may appear briefly and immediately disappear. It should be borne in mind that with such manifestations, the lamps themselves fail, the malfunction of which can be detected by replacing, connecting for diagnostics to the connectors that are known to be serviceable and suitable in power. 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-LC1914WD has no picture when a signal is present, often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) HT185WX1-501, 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 HT185WX1-501 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 the main board MainBoard JUG7.820.699-4 often 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 should track the passage of LVDS signals from MainBoard JUG7.820.699-4, as well as synchronizing signals from T-CON to loops with drivers.
In cases of an attempt to repair the JUG7.820.699-4 motherboard, it is necessary to check the performance of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating. Board repair and replacement of CPU chips: TSUMV26KE-LF, SPI FLASH: GD25Q40, EEPROM: 24C32. DVD - CPU: MT1389DE (JDAL), SPI FLASH: EN25F16, Pick: SOH-DL6. produced with the necessary equipment and the corresponding element base. Malfunctions associated with the use of BGA soldering technologies can be localized by the warm-up method.
Remember! Attempts to self-repair the SUPRA STV-LC1914WD TV by users without appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1914WD V2K11, Main JUG7.820.699-4, Panel: HT185WX1-501
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1914W, Main JUG7.820.1145, CPU TSUMV26KE-LF, EEPROM K24C32B, FLASH 25Q40T, Sound TDA1517P, Tuner TAF6-C2121VH 1913BR
In case of malfunctions in the SPI FLASH software manufactured by Winbond, sometimes they can temporarily restore their performance after temperature exposure, for example, warming up with a soldering station or a lighter. This is often enough to be able to read the standard software content. The microcircuit after that must be replaced with a new one.
Additional MainBoard RepairThe appearance of the MainBoard JUG7.820.699-4 is shown in the figure below:
JUG7.820.699-4
JUG7.820.699-4 can be used in TVs:
HYUNDAI H-LCD2418 (Panel M236MWF1), HYUNDAI H-LCD2218 (Panel M216H1-L01 Rev.C1), SUPRA STV-LC2214W (Panel LTA216AT01), SUPRA STV-LC1914WD (Panel HT185WX1-501), SUPRA STV-LC2214WD (Panel LTA216AT01), SUPRA STV-LC2414F (Panel M236MWF1), SUPRA STV-LC2414FD (Panel M236MWF1).
Main features of SUPRA STV-LC1914WD device:
Installed matrix (LCD panel) HT185WX1-501.
The required supply voltages for all nodes of the SUPRA STV-LC1914WD TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a JUG7.820.699-4 module, using CPU chips: TSUMV26KE-LF, SPI FLASH: GD25Q40, EEPROM: 24C32. DVD - CPU: MT1389DE (JDAL), SPI FLASH: EN25F16, Pick: SOH-DL6. and others.
Tuner CH TAF6-C2121VH 1913BP provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT185WX1-501
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: 200 cd / m²
Contrast Ratio: 600: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
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
LCD TV SUPRA STV-LC1914WD with LCD HT185WX1-501, 19 "(48 cm) 16: 9. Brightness of the screen of 300 cd / m² is provided by backlighting with CCFL (EEFL) fluorescent lamps. Contrast is the ratio of maximum brightness to a minimum of 1000: 1 Dynamic contrast ratio of 4000: 1 is achieved by a special control of the backlight.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in a graphic resolution of 720p (HD Ready) .Input high-frequency or video signal is decoded in analog PAL, SECAM, NTSC systems Graphic processing and digital signal formation is performed in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia file formats: MP3, WMA, MPEG4, VideoCD, SVCD, JPEG.
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, component, VGA, HDMI, 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.
The power consumed by the TV in operating mode from the network is 48 watts.
Overall dimensions: 524x427x130 mm.
TV weight: 5.9 kg.
Attention! SUPRA STV-LC1914WD LCD TV panel HT185WX1-501 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!