Technical description and composition of the SUPRA STV-LC1522WD TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1522WD
Chassis / Version: SP208ESA HK-SP7050V28
Panel: 15 inch
Inverter (backlight): LK-150205
PWM Inverter: ME4946, TL494
MOSFET Inverter: 2907, 2222
Power Supply (PSU): Adapter 12V
MainBoard: SP208ESA HK-SP7050V28
IC MainBoard: FSP3131, TDA9885, EN25T80, PI5V330, SPV7050, TDA1517
Tuner: TNF931D-BFR1
STV-LC1522WD Specifications
SUPRA STV-LC1522WD
General recommendations for TV LCD repair
SUPRA TV made on chassis HK-7050A-V2.08-E (SP208ESA), like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for searching for a defect before taking the necessary measurements at control points. In some cases, defective elements can be seen with the naked eye, for example, charred resistors or swollen sintered capacitors, or electrolytic ones in rectifier filters. The formed ring cracks in the soldering of the terminals of transformers or heating circuit elements are also frequent sources of many malfunctions with a variety of external manifestations.
If the power supply module fails, external manifestations may be different, for example, SUPRA STV-LC2222WD 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. The first step is to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse in the power supply is broken, in most cases a breakdown of the power switch (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the mains rectifier filter.
Mos-Fet switches used in switching power supplies (SMPS) rarely fail without reasons that must be looked for by checking other circuit elements. Breakdown is often caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or breakdown of resistors in stabilization circuits. The PWM controller microcircuit can also cause the breakdown of the power switch of the converter.
In cases where the SUPRA STV-LC2222WD 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.
In most cases, the diagnostics and repair of the inverter is difficult due to the organization of protection, which turns it off in emergency cases in order to avoid fires when short circuits or breaks in high-voltage circuits and when lamps are depressurized. Repairers often block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
The SUPRA STV-LC1522WD 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) 15 inches, for example, a malfunction of the CCFL (EEFL) lamps, and outside in their power source - the inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, to repair the backlight, disassembly of the LCD panel 15 is required - a painstaking process that requires increased 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 MainBoard SP208ESA main board 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 needs to track the passage of LVDS signals from the MainBoard SP208ESA, as well as synchronization signals from T-CON to loops with drivers.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or microcircuit power converters and, if necessary, update the software (software). Repair of the board and replacement of microcircuits SPV7050, CT3257A, EN25T80, AT24C32, TDA9885TS, YD1517P are performed 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.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repairs only to professionals with sufficient experience in the field of electronic repair ......
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> SP208ESA, CPU: SPV7050
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> SUPRA STV-LC1522WD, STV-LC1922WD, STV-LC2222WD. MAIN CVMV26L-A-20
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1522WD, Main: SP208ESA HK-SP7050V28, Panel: 15 INCHES
The appearance of the MainBoard SP208ESA is shown in the figure below:SP208ESA
SP208ESA can be used in TVs:
SUPRA STV-LC1522WD (Panel 15 inches), SUPRA STV-LC1922WD (Panel MP185GW01 V.2), SUPRA STV-LC2222W (Panel CLAA215FA01 (M)), SUPRA STV-LC2222WD (Panel CLAA215FA01).
External view of the power supply
Main features of SUPRA STV-LC1522WD device:
Installed matrix (LCD panel) 15 inches.
The LK-150205 inverter is used to power the backlight lamps, it is controlled by the ME4946, TL494 PWM controller. Switches of type 2907, 2222 are used as power elements of the inverter.
To power all internal components of the SUPRA STV-LC1522WD TV, an external adapter 12V is used.
MainBoard - the main board (motherboard) is a SP208ESA module, using FSP3131, TDA9885, EN25T80, PI5V330, SPV7050, TDA1517 and others.
The TNF931D-BFR1 tuner provides reception of television programs and tuning to channels.
LCD TV SUPRA STV-LC1522WD with LCD, 15 "diagonal, 16: 9 format. Screen brightness of 250 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast - ratio of maximum brightness to minimum brightness is 500: 1. Dynamic contrast ratio of 1000: 1 is achieved by 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 systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported multimedia file formats: MP3, VideoCD, SVCD, JPEG.
The power of the sound system of 6 W (2x3 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, S-Video, SCART, RGB, 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 mains is 36 W.
Overall dimensions: 406x340x160 mm.
TV weight: 5.8 kg.
Attention! The SUPRA STV-LC1522WD LCD TV panel is its most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!