Technical description and composition of the RUBIN RB-32SD8T2C TV, panel type and modules used. The composition of the modules.RUBIN LED
Model: RB-32SD8T2C
Chassis / Version: JUC7.820.00081373
Panel: M320X13-E1-L (G1)
T-CON: 6870C-0414A LC320EXN-SEA1-K31
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1251
MainBoard: JUC7.820.00081373
IC MainBoard: SPI FLASH: Q32B-14HIP
Tuner: R620D
Control: IR: JUC7.820.00081814
Specifications RB-32SD8T2C
RUBIN RB-32SD8T2C
General recommendations for TV LCD LED repair
Possible manifestations of defects
- RUBIN RB-32SD8T2C does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In this case, the main Switching Power Supply (AC / DC voltage converter), the elements of which are located on the MainBoard JUC7.820.00081373, may be faulty. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers NCP1251, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
Usually, in such cases, there is no backlight of the LED panel (matrix). Often the cause of a malfunction is the lack of current in the LED circuit, for example, their open or short circuit, or a violation of the contact connections of the connectors.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or 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. By opening the panel, you can check each LED separately. Typically, Chinese multimeters will lightly light one 3-volt LED when the probes are connected to it in the forward direction. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the JUC7.820.00081373 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - SPI FLASH: Q32B-14HIP. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
Before replacing the R620D tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. You also need to make sure that the tuner and processor can exchange data via the I2C bus
Users and owners of TVs should remember that attempts to repair the RUBIN RB-32SD8T2C TV on their own without the appropriate qualifications and necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> RUBIN RB-32SD8T2C, Main: JUC7.820.00084054 HLS49J 32C2000, Panel: M320X13-E3-H
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> RUBIN RB-32SD8T2C, Main: JUC7.820.00084054 LS1B 32C2000, Panel: C320X13-E3-L, FLASH: GD25Q32B
Another option for assembling RUBIN RB-32SD8:
MAIN: JUS7.820.00081373, T-con: LC320EXN-SEA1-k31, Panel: C320X13-E3-L (G1).
Additional MainBoard Repair
The appearance of the MainBoard JUC7.820.00081373 is shown in the figure below:
JUC7.820.00081373
JUC7.820.00081373 can be used in TVs:
AKAI LEA-32C25M (Panel M320X13-E1-H), ERISSON 32LEC2300 (Panel M320X13-E1-L), FUSION FLTV-28L32B (Panel M280X13-E1-H).
Key features of the RUBIN RB-32SD8T2C device:
Installed matrix (LED-panel) M320X13-E1-L (G1).
Matrix control uses a Timing Controller (T-CON) 6870C-0414A.
To power the backlight LEDs, a converter combined with the JUC7.820.00081373 main board is used, controlled by the OB3350CP PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using NCP1251 microcircuits.
MainBoard - the main board (motherboard) is a JUC7.820.00081373 module, using SPI FLASH chips: Q32B-14HIP and others.
The R620D tuner provides reception of television programs and tuning to channels.
RUBIN RB-32SD8T2C TV with LCD M320X13-E3-H, 32 "(81 cm) 16: 9 format diagonal. The required screen brightness of 350 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 150,000: 1 is achieved by special control The LCD panel of the TV is equipped with direct backlighting with rear-mounted LEDs - Direct LED.It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the 720p (HD Ready) graphics standard.Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping is performed in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x2, USB x2. 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 digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 735x484x170 mm, without stand 735x441x81 mm.
TV weight: with stand: 7.4 kg, without stand: 5.9 kg.
Attention! The M320X13-E3-H panel of the RUBIN RB-32SD8T2C LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
