REPAIRING / SERVICING TV RUBIN RB-22SL1UF

 Technical description and composition of the RUBIN RB-22SL1UF TV, panel type and modules used. The composition of the modules.
RUBIN LED
Model: RB-22SL1UF
Chassis / Version: MST6M181-T7S 471-01A2-61702G rev A2
Panel: LTM215HT04 led // LM230WF5
LED driver (backlight): // GT-02 471R1015 KB6160
PWM LED driver: MP3389EF // OB3362VP
MOSFET LED driver: ME4457-G (8), MEI5N60-G
Trans LED driver: 330
Power Supply (PSU): K-40L1 K_L-NM1 465-01A2-21402G
PWM Power: OB5269CP (8)
MOSFET Power: SW7N65
MainBoard: MST6M181-T7S 471-015A-61702G F50CT-2DD-e (x)
IC MainBoard: YD1517P, IT6633E-P, 3502M,
Specifications RB-22SL1UF
RUBIN RB-22SL1UF
General recommendations for TV LCD LED repair
It is advisable to start repairing the RUBIN RB-22SL1UF WH TV with a careful external examination of both internal and external elements. In some cases, visible external damage to elements can prompt the directions of troubleshooting and localization of the defect even before the necessary measurements are taken at the control points of electronic circuit assemblies. In most cases, the repairman can guess about the causes of the defect and the possible consequences by the characteristic signs of typical defects in TVs, for example, the formed ring cracks in the soldering of the element terminals, swollen capacitors of the rectifier filter, charred resistors and other circuit elements.
In the complete absence of any signs of operability, when RUBIN RB-22SL1UF does not turn on and does not signal anything with control lamps on the panel, there is a possibility of malfunction of the power supply module K_L-NM1 465-01A2-21402G K-40L1 of the TV. The power supply regulator of the control processor on the motherboard may also be faulty with the same manifestations. When repairing a power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the secondary rectifiers of the converter. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. First of all, it is necessary to check the diodes of the mains voltage rectifier bridge and the power switch (keys) of the SW7N65 converter.
Mos-Fet switches used in switching power supplies (SMPS) rarely fail without reasons that must be looked for by checking other circuit elements. Breakdown is often caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or breakdown of resistors in stabilization circuits. The PWM controller microcircuit B5111A OB5269CP (8) can also cause the breakdown of the power switch of the converter.
If, when you turn on RUBIN RB-22SL1UF, there is no image, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the LED circuit of the LTM215HT04 led // LM230WF5 panel backlight, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the common power supply.
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.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
If the motherboard MST6M181-T7S 471-015A-61702G F50CT-2DD-e (x) TCL1108201486 is faulty, first of all it is necessary to check all linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes it is possible to check the health of the MB only by replacing it.

Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace elements YD1517P, IT6633E-P, 3502M,. BGA chip faults are usually easy to detect by warm-up.

Owners and users of the RUBIN RB-22SL1UF TV need to remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to the complete non-repairability of the device!

 DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->   RUBIN RB-22SL1UF, Main Board: MST6M182VG-T7S, Cpu: MST6E182VG-LF-Z1, Spi Flash: 25Q32 Panel: LM215WF4 (TL) (E7)

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 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 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, you should update the SPI Flash software.

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-22SL1UF device:
Installed matrix (LED panel) LTM215HT04 led or LM230WF5.

A LED driver is used to power the backlight LEDs, it is controlled by the PWM controller MP3389EF // OB3362VP. The transformer 330 is installed in the converter of the LED driver. The keys of the type ME4457-G (8), MEI5N60-G are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the RUBIN RB-22SL1UF TV is carried out by the K-40L1 power module, or its analogs using OB5269CP microcircuits (8) and power switches of the SW7N65 type.
MainBoard - the main board (motherboard) is an MST6M181-T7S module, using YD1517P, IT6633E-P, 3502M chips, and others.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM215HT04-V
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.5 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 476.64x268.11 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 10S3P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
RUBIN RB-22SL1UF TV with LCD display LTM215HT04, 22 "(56 cm) 16: 9. The LED panels of this TV are equipped with edge LED backlighting.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 formation is performed in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system is 6 W (2x3 W), 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 W.
Dimensions: without stand 535x394x36 mm.
TV weight: without stand: 5 kg.
Attention! The LTM215HT04 panel of the RUBIN RB-22SL1UF LED 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.