Technical description and composition of the TV SUPRA STV-LC19T551WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC19T551WL
Chassis / Version: V1P01
Panel: HM185WX3-400
LED backlight: EDGE LED
T-CON: HM185WX1-400.X0.0
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: ME15N10-G
Power Supply (PSU): CTN1034-L
PWM Power: PWM SOT23-6 OB2273
MOSFET Power: TO-220 4N60
MainBoard: T.SIS231.T65
IC MainBoard: 25Q64BSIG, NT5CB64M16FP, YD1517P
Tuner: SI2168 40
Control: IR: MX-32N16-IR T
Technical Specifications STV-LC19T551WL
SUPRA STV-LC19T551WL
General repair guidelines for TV LCD LED
Possible malfunctions
- The SUPRA STV-LC19T551WL TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In such cases, the CTN1034 power supply is usually faulty. It is necessary then to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converters for the probability of short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM SOT26-3 PWM controllers, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
Usually in such cases there is no backlight LED-panel (matrix). Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the T.SIS231.T65 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - 25Q64BSIG, NT5CB64M16FP, YD1517P. Defective components should be replaced.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner SI2168 40 and update the software. The pulses from the I2C bus must be monitored using an oscilloscope.
It should be remembered! Attempts to independently repair the SUPRA STV-LC19T551WL 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-serviceability of the device!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC19T551WL V1P01, Main: T.SIS231.T65, Panel: HM185WX3-400
The appearance of MainBoard T.SIS231.T65 is shown in the figure below:T.SIS231.T65
T.SIS231.T65 can be used on TVs:
DNS M24DM8 (Panel M236HGE-L20 ReV.C1), DNS 22AE7000 (Panel CX215LEDM), ERISSON 28LEP91 (Panel st2751a01-1), ROLSEN RL-19E1501T2C (Panel V185BJ1-PE1), RUBIN RB-22SE5FT2C (Panel LM215DA-T01), RUBIN RB-22SE9FT2C (Panel M215HTN01.1), SHIVAKI STV-24LEDGR9 (Panel M236HGE-L20 Rev.C1), SHIVAKI STV-24LEDGW9 (Panel M236H3-LA3), SHIVAKI STV-24LED12 (Panel M236HGE-P01), THOMSON T24E09DU-01B (Panel V236BJ1-P03 (C1)).
The appearance of the power supply
Main features of the SUPRA STV-LC19T551WL device:
Installed matrix (LED-panel) HM185WX3-400.
The matrix control uses the Timing Controller (T-CON) HM185WX1-400.X0.0.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3350CP PWM controller. As power elements of the LED driver, keys of the type ME15N10-G are used.
The necessary supply voltages for all nodes of the SUPRA STV-LC19T551WL TV are generated by the CTN1034-L power module or its analogs using PWM SOT23-6 OB2273 microchips and TO-220 4N60 power switches.
MainBoard - the main board (motherboard) is a T.SIS231.T65 module, using 25Q64BSIG, NT5CB64M16FP, YD1517P and other chips.
The tuner SI2168 40 receives television programs and tunes to channels.
Additional technical information about the panel:
Brand: BOE
Model: HM185WX3-400
Type: a-Si TFT-LCD, CELL
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), Antireflection
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.4% (with Polarizer)
Contrast Ratio: 600: 1
Display Colors: 16.7M (8-bit)
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC19T551WL with LCD, diagonal size 18.5 "(47 cm) 16: 9 format. The required brightness of the screen 200 cd / m² is provided by LED backlight LED. Dynamic contrast ratio of 60,000: 1 is achieved by special control of the LEDs in depending on the illuminance of the plots in the plot. The model’s display manufacturing technology uses LED LED backlighting. You can watch broadcasts and movies and images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 500x340x120 mm.
Attention! The panel of a SUPRA STV-LC19T551WL LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.