Technical description and composition of the RUBIN RB-19SL1U TV, panel type and modules used. The composition of the modules.RUBIN LED
Model: RB-19SL1U
Chassis / Version: M181
Panel: 19 inch
LED driver (backlight): PNM1-B8Q161-05141
PWM LED driver: MP3389EF
Trans LED driver: KTC 401-1040-33501G
Power Supply (PSU): PNM1-B8Q161-05141
PWM Power: NCP1271
MOSFET Power: SW7N65
MainBoard: M181-B7P050-03111, MST6M181-T7S T7
IC MainBoard: 1517P, II6633E-P, MP1482 (8), MT4953 (8)
Tuner: F50CT-2DD-E (X)
RUBIN LED
Model: RB-19SL1U WH
Chassis / Version: M182
Panel: 19 inch
LED driver (backlight): K-XL-0B1 479-01A3-3362OG
PWM LED driver: OB3362VP (28 pin MP3389)
MOSFET LED driver: ME15N10-G
Trans LED driver: 330
Power Supply (PSU): K-40L1 465-01A2-B5269G
PWM Power: OB5269CP (8)
MainBoard: MST6M182VG-T7S M182-C8P158-04737
IC MainBoard: YD1517P, IT6633E-P, Winbond 25Q32
Tuner: KTDANW-14-09
Specifications RB-19SL1U
RUBIN RB-19SL1U
General recommendations for TV LCD LED repair
Repair and diagnostics of any electronic device, in particular RUBIN RB-19SL1U WH, it is advisable to begin with a careful external examination of the internal and external elements. Based on visible external changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of a defect before taking the necessary measurements. Experienced repairmen often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external indirect signs.
If the power supply module K-40L1 465-01A2-B5269G is faulty, the external manifestations can be different, for example, RUBIN RB-19SL1U does not turn on at all and there is no indication of the control lamps on the front panel. With the same symptoms, the regulator (converter) of the control processor power supply may be faulty. Diagnostics and repair of the common power supply should always begin with checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the mains rectifier, as well as the large electrolytic capacitor of the mains rectifier filter.
As a rule, switches in switching power supplies (SMPS) are quite reliable and rarely fail without reasons that should be looked for by checking other circuit components - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM microcircuit is checked by replacing it with a known good one.
If the RUBIN RB-19SL1U has no image, but there is sound and the TV is controlled from the remote control, there is likely a malfunction in the panel backlight circuits. LEDs or power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary 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.
Often, in the absence of backlight, disassembly of the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
On the M182-C8P158-04737 MST6M182VG-T7S 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 YD1517P, IT6633E-P, Winbond 25Q32. Defective elements must be replaced. If BGA chips are installed, their failure is usually localized by warming up.
Attention! Users and owners of RB-19SL1U TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> RUBIN LED RB-19SL1U Chassis: T.MS6M181.7A
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> RUBIN RB-19SL1U, Main Board: 471-01A2-61703G, Cpu: MST6M182VG-T7S, Winbond 25Q32
If the SPI FLASH Winbond software fails, we recommend replacing the microcircuit with a new one. In addition, faulty Winbond microcircuits can sometimes restore their performance for a while after warming up with a soldering station or even a lighter, which is enough to read its standard contents.
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analog OB3362VP (28 pin), the total resistance of the resistors from pin 9 (ISET) to the case should be proportionally increased. The maximum current in each of the 12 channels (in milliamperes) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. When the channels are connected in parallel, the currents are summed up.
Additional MainBoard Repair
The appearance of the MainBoard MST6M182VG-T7S is shown in the figure below:
MST6M182VG-T7S can be used in TVs:
DAEWOO DSL-24L31E (Panel K236WL), ERISSON 23LEK14 (Panel 1080p Full HD 1920x1080), ERISSON 19LEK14 (Panel M185BGE-L22 Rev.C1), HYUNDAI H-LED22V5 (Panel LM215WF4), HYUNDAI H-LED24V11 (Panel LM230WF5 (TL)(D1) ), ROLSEN RL-17L1002U (Panel LTN173KT02 ), RUBIN RB-19SL1U WH (Panel 19 ").
External view of the power supply
Key features of the RUBIN RB-19SL1U device:
Installed matrix (LED panel) 19 inches.
The LED driver K-XL-0B1 is used to power the backlight LEDs, it is controlled by the OB3362VP PWM controller (28 pin MP3389). The transformer 330 is installed in the LED driver converter. The keys of the ME15N10-G type are used as the power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the RUBIN RB-19SL1U TV is carried out by the K-40L1 power module, or its analogs using OB5269CP microcircuits (8).
MainBoard - the main board (motherboard) is a MST6M182VG-T7S module, using YD1517P, IT6633E-P, Winbond 25Q32 and others.
The KTDANW-14-09 tuner provides reception of television programs and tuning to channels.
RUBIN RB-19SL1U LCD TV, 19 "(48 cm) in 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 LED control. -Panels of this TV are equipped with edge lighting from LEDs - Edge LED.It is possible to view 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 can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system of 6 W (2x3 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 x2, S-Video, component, VGA, HDMI x2, USB. A headphone output is provided. 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.
The power consumed by the TV in operating mode from the network is 35 watts.
Dimensions: without stand 469x362x36 mm.
TV weight: without stand: 4 kg.
Attention! The panel of the RUBIN RB-19SL1U 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.