Technical description and composition of the TV SUPRA STV-LC19500WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC19500WL
Chassis / Version: T.VST59.11 ver V1M02
Panel: HK185WLDEM-HH76H
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
MOSFET LED driver: ME15N10-G
Power Supply (PSU): HKL-190401
PWM Power: OB2273
MOSFET Power: JCS4N65F
MainBoard: T.VST59.11
IC MainBoard: CPU: VST59XE-Z1, FLASH: GD25Q32
Tuner: CDT-3NPI1-10
STV-LC19500WL Specifications
SUPRA STV-LC19500WL
General recommendations for TV LCD LED repair
Diagnostics of malfunctions and repair of SUPRA STV-LC19500WL, like other electronic devices, it is recommended to begin with an external examination of external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. In most cases, the repairman can guess about the causes of the defect and the possible consequences by the characteristic signs of typical defects in TVs, for example, the formed ring cracks in the soldering of the element terminals, swollen capacitors of the rectifier filter, charred resistors and other circuit elements.
If SUPRA STV-LC19500WL 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 malfunction of the HKL-190401 power supply module. In some cases, only the processor power supply regulator may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of the transistors and diodes of the rectifier bridge should be checked for avalanche (thermal) breakdown.
The reasons for the breakdown of the power switch in switching power supplies (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of a PWM controller microcircuit or breaks in resistors in its strapping.
If the SUPRA STV-LC19500WL does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the HK185WLDEM-HH76H panel is likely. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when the TV is turned on, an image appears and immediately disappears. First of all, you need to make sure that the electrolytic capacitors of the rectifier filter supplying the LED driver are in good working order, and check the LEDs by connecting those that are known to be working for diagnostics.
A malfunction in the backlight circuits often occurs due to a break in the power supply lines of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the circuit of the LED lines without disassembling the panels using a tester or a multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.On the VST59.11 motherboard, in case of a malfunction, you should first check the operability of all stabilizers or power converters of microcircuits and, if necessary, update the software (software).
When repairing an MB board, you need to check its components CPU: VST59XE-Z1, FLASH: GD25Q32. Defective elements must be replaced. If BGA chips are installed, their failure is usually localized by warming up.
Owners of the STV-LC19500WL TV are advised to contact only qualified specialists with experience for repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC19500WL V1M02 Main VST59.11
In case of failures in the software of Winbond SPI FLASH microcircuits, they can for some time restore their performance after temperature exposure - heating the soldering station with a hairdryer or even a lighter. Usually this is enough to read the regular contents of the software. In such cases, the chip must be replaced with a new one.
To reduce the backlight current in LED drivers with OB3362RP (TSOP16) controller, increase the total resistance of the resistors from pin 5 (ISET) to the case. The maximum current in each of the four channels (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 3000 * 1.2V / Rset.
Repair MainBoardThe appearance of MainBoard T.VST59.11 is shown in the figure below:
T.VST59.11
It is advisable to start the repair of the T.VST59.11 motherboard, made on the basis of the TSUMV59Xxx multifunction processor, by checking the operability of the linear voltage stabilizers or converters necessary to provide power to the processor nodes - 1.2V core power, DDR 1.8V memory and Stand-by 3.3V mode ... If there is no image, but the display backlight is working properly, check the power supply voltage of the LCD panel 5V or 12V, depending on the type of panel used.
T.VST59.11 can be used in TVs:
SUPRA STV-LC19500WL (Panel HK185WLDEM-HH76H), FUSION FLTV-19L31B (Panel HK185WLEDM-HH75H), FUSION FLTV-22L31B (Panel LC215DT5A), SUPRA STV-LC24500FL (Panel 1080p Full HD 1920x1080), FUSION FLTV-24LF31B (Panel HK236WLEDM-BH56H).
External view of the power supply
Key Features of SUPRA STV-LC19500WL:
Installed matrix (LED panel) HK185WLDEM-HH76H.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the OB3362RP PWM controller. The keys of the ME15N10-G type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC19500WL TV is carried out by the HKL-190401 power supply module, or its analogs using OB2273 microcircuits and JCS4N65F power switches.
MainBoard - the main board (motherboard) is a T.VST59.11 module, using CPU chips: VST59XE-Z1, FLASH: GD25Q32 and others.
The CDT-3NPI1-10 tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC19500WL with LCD HK185WLDEM-HH76H, diagonal 19 "(48 cm) 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 60,000: 1 is achieved by special control operation of LEDs depending on the illumination of areas in the scene.This model uses an LED-panel with an edge arrangement of backlighting LEDs - Edge LED.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, MKV, JPEG .
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, SCART, RGB, VGA, HDMI, USB. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV in operating mode from the network is 30 W.
Dimensions: With stand 442x330x130 mm, Without stand 442x282x57 mm.
Attention! The HK185WLDEM-HH76H panel of a SUPRA STV-LC19500WL 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.