Technical description and composition of the RUBIN RB-28D7 TV, panel type and modules used. The composition of the modules.RUBIN LED
Model: RB-28D7
Chassis / Version: CV59SH-A32
Panel: CX275DLEDM
MainBoard: CV59SH-A32
IC MainBoard: CPU: TSUMV59XUS-Z1, SPI FLASH: GD25Q32
Specifications RB-28D7
RUBIN RB-28D7
General recommendations for TV LCD LED repair
RUBIN RB-28D7 TV, like many other electronic devices, it is advisable to start repairing with an inspection of all external and internal elements. Visible damage to elements can sometimes indicate the direction of searching for a defect even before the necessary measurements are taken. Elements with visible damage, for example, capacitors swollen after electrolyte boiling, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master guess about the causes and possible consequences of the malfunction.
Power supply module malfunctions can be expressed in different ways, for example, RUBIN RB-28D7 does not turn on at all and the control lamps on its front panel do not light up or blink, all signs of operability are absent. It should be noted that the processor power regulator (converter) may be faulty with the same external manifestations. The first step is to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse in the power supply is broken, in most cases a breakdown of the power switch (s) is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the mains rectifier filter.
Power switches in switching power supplies (SMPS) fail for no reason very rarely and, in case of their breakdown, it is necessary to look for a malfunction in the stabilization circuits, checking electrolytic capacitors, semiconductor devices and resistors in the primary circuit. The reason may be a malfunction of the PWM regulator microcircuit, which can only be checked by replacing it with a new or known good one.
If RUBIN RB-28D7 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the LED circuit of the CX275DLEDM panel backlight or their power converter - LED driver. Sometimes, when turned on, the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main power supply unit.
In most cases of lack of backlighting, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or more LEDs do not work in one line, then they are broken and should be replaced.
It is impossible to identify an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or microcircuit power converters and, if necessary, update the software (software).
Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements of the CPU: TSUMV59XUS-Z1, SPI FLASH: GD25Q32. Malfunctions in BGA chips are usually easy to detect by warm-up.
Attention to users! Independent repair of the RUBIN RB-28D7 TV without proper qualifications and experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> RUBIN RB-28D7, Main: CV59SH-A32, Panel: CX275DLEDM
The appearance of the MainBoard CV59SH-A32 is shown in the figure below:CV59SH-A32
Key features of the RUBIN RB-28D7 device:
Installed matrix (LED panel) CX275DLEDM.
The necessary supply voltages for all nodes of the RUBIN RB-28D7 TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a CV59SH-A32 module using CPU chips: TSUMV59XUS-Z1, SPI FLASH: GD25Q32 and others.
RUBIN RB-28D7 TV with LCD CX275DLEDM, diagonal 28 "(71 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 200,000: 1 is achieved by special control of the LEDs. 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 a graphic resolution of 720p (HD Ready) .Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping takes place in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power 16 W (2x8 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, component, VGA, HDMI x2, USB. 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.
Dimensions: with stand 645x444x190 mm, without stand 645x403x73 mm.
Attention! The CX275DLEDM panel of the RUBIN RB-28D7 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.