Technical description and composition of the SUPRA STV-LC1922WD TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1922WD
Chassis / Version: CVMV26L-A-20 V2J08
Panel: MT185GW01 V.0
MainBoard: CVMV26L-A-20
IC MainBoard: TSUMU26KE-LF, 25F40, 24C02, 24C32, TDA1517P, MP1423DN, SPHE8202TQ, W9864G61H-6, 25F80
Tuner: F21WT-3BAR-E
SUPRA
Model: STV-LC1922WD
Chassis / Version: SP208ESA HK-7050A-V2.80-E
Panel: MP185GW01 V.2 // M156MWR1
Inverter (backlight): LK-IN220201A
Power Supply (PSU): Adapter 12V
MainBoard: SP208ESA HK-7050A-V2.80-E
IC MainBoard: EN25T80, 24C32, 24C02, EN25T80
Tuner: TNF931D-BFR1
STV-LC1922WD Specifications
SUPRA STV-LC1922WD
General recommendations for TV LCD repair
Diagnostics of malfunctions and repair of SUPRA with chassis SP208ESA HK-7050A-V2.80-E, like other electronic devices, it is recommended to begin with an external examination of external and internal elements. In some cases, visible external damage to elements can suggest directions for troubleshooting and localizing a defect even before the necessary measurements are taken at the control points of electronic circuit assemblies. 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.
If SUPRA STV-LC1922WD does not turn on, no indicator lamps on the front panel will light up or blink, therefore, there is a very high probability of a power module malfunction. In some cases, only the processor power regulator may be faulty. When diagnosing and repairing the power supply, first of all, you should replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is broken, you must identify the cause. Often in such cases an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and transistors in the primary circuit.
Power switches in switching power supplies (SMPS) fail for no reason very rarely and, in case of their breakdown, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices and resistors in the primary circuit. The reason may be a malfunction of the PWM regulator microcircuit, which can only be checked by replacing it with a new or known good one.
If SUPRA STV-LC1922WD has no picture, but there is sound, there is a possibility of a malfunction of the backlight lamps or their power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are in good condition.
Diagnostics of the inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency situations, for example, when short circuits or breaks in the lamp supply circuit, as well as their possible depressurization. To make the necessary measurements at the control points or to take the necessary oscillograms, the repairers have to block the protection circuits in order to be able to diagnose.
The SP208ESA HK-7050A-V2.80-E motherboard is subject to checking if there is no response to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software. Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - EN25T80, 24C32, 24C02, EN25T80, TNF931D-BFR1 tuner and replace the faulty chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
The SUPRA STV-LC1922WD has no picture when there is a signal, often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) MP185GW01 V.2, 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, to repair the backlight, disassembly of the MP185GW01 LCD panel 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.
I 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.
Remember! Attempts to repair the SUPRA STV-LC1922WD TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard SP208ESA is shown in the figure below:
SP208ESA
SP208ESA can be used in TVs:
SUPRA STV-LC1522WD (Panel 15 дюймов), SUPRA STV-LC1922WD (Panel MP185GW01 V.2), SUPRA STV-LC2222W (Panel CLAA215FA01 (M)), SUPRA STV-LC2222WD (Panel CLAA215FA01).
Main features of SUPRA STV-LC1922WD device:
Installed matrix (LCD-panel) MP185GW01 V.2 or M156MWR1.
The LK-IN220201A inverter is used to power the backlight lamps.
An external adapter 12V is used to power all the internal components of the SUPRA STV-LC1922WD TV.
MainBoard - the main board (motherboard) is an SP208ESA module, using chips EN25T80, 24C32, 24C02, EN25T80 and others.
The TNF931D-BFR1 tuner provides reception of television programs and tuning to channels.
SUPRA LCD TV STV-LC1922WD with LCD MP185GW01, 19 "(48 cm) 16: 9 format diagonal. Screen brightness of 250 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast - ratio of maximum brightness to minimum brightness 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 720p (HD Ready) .Input high-frequency or video signal is decoded in analog PAL systems , 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: 470x377x180 mm.
TV weight: 7.2 kg.
Attention! SUPRA STV-LC1922WD LCD TV panel MP185GW01 V.2 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!