Technical description and composition of the TV SUPRA STV-LC1935WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC1935WL
Chassis / Version: JUG7.820.699-2
Panel: M185XW01 V6
LED driver (backlight): integrated into MainBoard
PWM LED driver: A8504
MainBoard: JUG7.820.699-2
IC MainBoard: CPU: TSUMV26, EEPROM: 24LC32B, SPI Flash: EN25F40-100CP
Tuner: CDT-3LC4I1-00
Technical Specifications STV-LC1935WL
SUPRA STV-LC1935WL
General repair guidelines for TV LCD LED
SUPRA STV-LC1935WL, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, which is typical for certain SUPRA models. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the filters of the secondary rectifiers (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.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
In cases where the SUPRA STV-LC1935WL TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (a converter for powering the backlight LEDs of the M185XW01 V6 panel). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
On the JUG7.820.699-2 motherboard, in case of a malfunction, you should first check the performance of all stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - CPU: TSUMV26, EEPROM: 24LC32B, SPI Flash: EN25F40-100CP. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The malfunction of the tuner CDT-3LC4I1-00 is established after checking the software and all supply voltages at its terminals.
Once again, we remind users of TV: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1935WL, Main: JUG7.820.699-2, Panel: M185XW01 V6
The appearance of the MainBoard JUG7.820.699-2 is shown in the figure below:JUG7.820.699-2
JUG7.820.699-2 can be used on TVs:
AKAI LEA-22C05P (Panel CLAA215FA04), SUPRA STV-LC2435FL (Panel V236H1-LE2 Ver C1), SUPRA STV-LC2235FL (Panel M215HW01), SUPRA STV-LC2455FL (Panel V236H1-LE2), SUPRA STV-LC1935WL (Panel M185XW01 V6), SUPRA STV-LC2255FL (Panel M215HW01 V6).
Main features of the SUPRA STV-LC1935WL device:
Installed matrix (LED-panel) M185XW01 V6.
To power the backlight LEDs, a converter is used, combined with the main board JUG7.820.699-2, controlled by the A8504 PWM controller.
The required supply voltage for all nodes of the TV SUPRA STV-LC1935WL provides a switching power supply.
MainBoard - the main board (motherboard) is a JUG7.820.699-2 module, using CPU chips: TSUMV26, EEPROM: 24LC32B, SPI Flash: EN25F40-100CP and others.
The tuner CDT-3LC4I1-00 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 V6
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 strings WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
SUPRA STV-LC1935WL LED TV with M185XW01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 3000: 1. This model uses an LED panel with the end position of the backlight LEDs - Edge LED. You can watch broadcasts and movies and images in high quality HD with a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal is decoded in analog PAL, SECAM, NTSC systems.The graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the speaker system of sound 4 W (2x2 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. 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.
The power consumed by the TV in the operating mode from the network is 30 watts.
Overall dimensions: 512x385x120 mm.
TV Weight: 3.8 kg.
Attention! The M185XW01 V6 panel of a SUPRA STV-LC1935WL 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.