Technical description and composition of the SUPRA STV-LC1617W TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1617W
Chassis / Version: CVMV26L-A
Panel: LM156WH (TL) (E1)
Lamp backlight: 2 Lamp CCFL
Inverter (backlight): LK-IN190201-001 CQC04001011196
Power Supply (PSU): LK1048-005C
MainBoard: CVMV26L-A
IC MainBoard: CPU: TSUMV26KE-LF, SPI FLASH: F40-100GCP, EEPROM: K24C32, Sound: TDA1517P
Tuner: F21WT-3BAR-E
Control: IR: 15A-24A15-IR-V1.2
STV-LC1617W Specifications
SUPRA STV-LC1617W
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- TV SUPRA STV-LC1617W 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.
In such cases, the fault should be looked for first of all in the LK1048-005C power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for possible partial or complete breakdown.
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM), if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacement.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
These manifestations can be triggered by the power module, or by defects in the inverter, as well as by skewed currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the keys of the converter and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
The SUPRA STV-LC1617W has no picture when there is a signal, and it is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) TMS156WX1-02TC, 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 TMS156WX1-02TC 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.
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 CVMV26L-A 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 must track the passage of LVDS signals from the MainBoard CVMV26L-A, as well as synchronizing signals from T-CON to loops with drivers.
Repair or diagnostics of the CVMV26L-A motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Complicated MB (SSB) repair is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: TSUMV26KE-LF, SPI FLASH: F40-100GCP, EEPROM: K24C32, Sound: TDA1517P requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
Malfunction of the F21WT-3BAR-E tuner is established after checking the software and all supply voltages at its terminals. The I2C bus communication between the tuner and the processor can be monitored with an oscilloscope.
Attention! Users and owners of STV-LC1617W TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that may lead to the complete non-repairability of the device.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1617W, Main: CVMV26L-A, Panel: LM156WH (TL)(E1)
The appearance of the MainBoard CVMV26L-A is shown in the figure below:CVMV26L-A
External view of the power supply
Main features of SUPRA STV-LC1617W device:
Installed matrix (LCD panel) LM156WH (TL) (E1).
The LK-IN190201-001 inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC1617W TV is carried out by the LK1048-005C power module, or its analogs.
MainBoard - the main board (motherboard) is a CVMV26L-A module, using CPU chips: TSUMV26KE-LF, SPI FLASH: F40-100GCP, EEPROM: K24C32, Sound: TDA1517P and others.
The F21WT-3BAR-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM156WH1-TLE2
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Brightness: 200 cd / m²
Contrast Ratio: 950: 1
Display Colors:, CIE1931 60%
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)
LCD TV SUPRA STV-LC1617W with LCD TMS156WX1-02TC, 16 "(41 cm) diagonal 16: 9. Brightness of the screen 250 cd / m² provided by backlighting CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio 2000: 1 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 the standard graphic decomposition of 720p (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital formation signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
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, 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, 1360x768.
The power consumed by the TV in operating mode from the network is 45 watts.
Dimensions: With stand 392x318x145 mm, Without stand 392x279x70 mm.
TV weight: 3.5 kg.
Attention! SUPRA STV-LC1617W LCD TV panel TMS156WX1-02TC is its most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!