Technical description and composition of the RUBIN RB-23SL1UF TV, panel type and modules used. The composition of the modules.RUBIN LED
Model: RB-23SL1UF
Chassis/Version: MST6M181-T7S
Panel: 23 inch
LED driver (backlight): K-L-NM1 (465-0101-0B201G) (PBB2-C2Q277-00432) (941-0624-181140)
PWM LED driver: OB3362VP (MP3389EF)
MOSFET LED driver: ME15N10-G, SPP9527
Trans LED driver: KTC-401-1040-33501G
Power Supply (PSU): K-L-NM1 (465-0101-0B201G) (PBB2-C2Q277-00432) (941-0624-181140 )
PWM Power: OB5269CP (8pin)
MOSFET Power: SW7N65
MainBoard: MST6M181-T7S
IC MainBoard: IT6633E-P , TDA1715P , FT24002A , TE330C(AA7F1G4) , MT495J , RT8274
Đ¢uner: F50CT-2DD-E TCL12010517621300
Specifications RB-23SL1UF
RUBIN RB-23SL1UF
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- The RUBIN RB-23SL1UF TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
In such cases, the fault should be looked for first of all in the power module K-L-NM1. It is then necessary to measure its output voltages and, if they are absent, the power switches (SW7N65) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in short-circuit mode, and in case of short-circuit in the elements of the primary circuit, the mains fuse usually breaks off.
Breakdown of Mos-Fet keys used in switching power supplies is often caused by malfunctions of other elements, for example, supply, frequency setting, damper ... as well as elements of the Negative Feedback Stabilization. The PWM microcircuit (PWM) OB5269CP (8pin) can also cause the converter power switch to malfunction and is checked by replacement.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The malfunction in most of such cases is found in the nodes and elements of the LED panel backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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 if you connect the probes 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 MST6M181-T7S motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and 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 - IT6633E-P, TDA1715P, FT24002A, TE330C (AA7F1G4), MT495J, RT8274. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
If you suspect a malfunction of the F50CT-2DD-E TCL12010517621300 tuner, first of all you need to make sure that the software is correct, as well as the presence of the required supply voltage levels and pulses of data exchange with the processor via the I2C bus on the corresponding tuner pins.
Attention! Users and owners of RB-23SL1UF TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
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.
The appearance of the MainBoard MST6M181-T7S is shown in the figure below:The MST6M181-T7S motherboard uses an MST6M181VS-LF-Z1 processor combined with a scaler, external random access memory (RAM) DDR Winbond W9425G6JH type and SPI flash ROM 25Q32.
It is advisable to start MainBoard repair by checking the supply voltages of the linear stabilizers and voltage converters required to provide power to the processor nodes: 1.2V, 2.5V, 3.3V. The power supply of the LCD panel is 5V or 12V, depending on the type of panel used, it can be measured directly at the LVDS connector. In cases where the TV does not come out of Stand-by mode, does not respond to the remote control and control buttons in the presence of all supply voltages, the SPI Flash software should be updated.MST6M181-T7S can be used in TVs:
ERISSON 22LEK14 (Panel M215H3-LA1 REV.C1), ROLSEN RL-17L1002U (Panel LTN173KT01-A01), ROLSEN RL-17L1002U (Panel LTN173KT02 ), ROLSEN RL-19L1002U (Panel 19 "), ROLSEN RL-22L1002UF (Panel LTM215HT04 B2 (5v)), ROLSEN RL-23L1002UF (Panel M230WA01-ED G2 EE01 LED), RUBIN RB-19SL1U (Panel 19 "), RUBIN RB-22SL1UF (Panel LTM215HT04 led), RUBIN RB-23SL1UF (Panel 23 ").
External view of the power supply
Key features of the RUBIN RB-23SL1UF device:
Installed matrix (LED-panel) 23 inches.
The K-L-NM1 LED driver is used to power the backlight LEDs, it is controlled by the OB3362VP PWM controller (MP3389EF). The transformer KTC-401-1040-33501G is installed in the LED driver converter. The keys of the ME15N10-G, SPP9527 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the RUBIN RB-23SL1UF TV is carried out by the K-L-NM1 power module, or its analogs using OB5269CP (8pin) microcircuits and power switches of the SW7N65 type.
MainBoard - the main board (motherboard) is an MST6M181-T7S module, using chips IT6633E-P, TDA1715P, FT24002A, TE330C (AA7F1G4), MT495J, RT8274 and others.
Tuner F50CT-2DD-E TCL12010517621300 provides reception of television programs and tuning to channels.
RUBIN RB-23SL1UF LCD TV 23 "(58 cm) in 16: 9 format. The required brightness of the screen of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 80000: 1 is achieved by special control of the LEDs. - the panels of this TV are equipped with edge lighting made of LEDs - Edge LED.The design and technical capabilities of the TV provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD) .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, 1080p standards 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 568x418x36 mm.
TV weight: without stand: 4 kg.
Attention! The panel of the RUBIN RB-23SL1UF 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.