REPAIR / SERVICING TV TOSHIBA 32L6353RK

Technical description and composition of the TOSHIBA 32L6353RK TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 32L6353RK
Chassis / Version: 32L4300
Panel: 96.32S14.001
LED backlight: 2013TSB32 5630 60 REV1.0
T-CON: LC470EUN-SFF1_Control_ver1.0 6870C-0438A
LED driver (backlight): integrated into PSU; 47.25V 480 mA
PWM LED driver: OB3362RP (16)
Power Supply (PSU): B191-202 D39 REV.D - 4H.B1910.031 / D
PWM Power: B127H (DM0365 STB), FAN7930 (PFC), SSC9522S
MOSFET Power: P0550ATF, P1060ATF (PFC)
MainBoard: 32L4300 REV1.02A
IC MainBoard: CPU: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG
Tuner: TDSS-G231D
Control: IR: LV2_IR REV 1.03, Wifi: 1353A-WLU5053 WLU5053 D4
Specifications 32L6353
TOSHIBA 32L6353RK
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the TOSHIBA 32L6353RK does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the power module B191-202 D39 REV.D - 4H.B1910.031 / D of the TV. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the IC_Power PWM regulator chip are subject to verification, which it is desirable to verify by replacement.
Sometimes the TOSHIBA 32L6353RK TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - power converter for the backlight LEDs of the panel 96.32S14.001, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by the power of the backlight unit.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
On the motherboard 32L4300 REV1.02A, in the event of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG and failed chips replace with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDSS-G231D tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.

Owners and users of the TOSHIBA 32L6353RK TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!

To reduce the backlight current in LED drivers with an OB3362RP (TSOP16) controller, increase the total resistance of the resistors from pin 5 (ISET) to the chassis. The maximum current in each of the four channels (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 3000 * 1.2V / Rset.

The appearance of the MainBoard 32L4300 is shown in the figure below:
32L4300
32L4300 can be used in TVs:
TOSHIBA 32L4353RB (Panel T320HVN04), TOSHIBA 39L4353RB (Panel T390HVN01.0 / XL), TOSHIBA 40L6353RK (Panel LSC400HM06 T01), TOSHIBA 40L7356RK (Panel LSC400HF03 T01), TOSHIBA 40L7363RK (Panel LSC400HF03 T01), TOSHIBA 50L7363RK (Panel 50 inch), TOSHIBA 32L6353RK (Panel 96.32S14.001), TOSHIBA 39L4363D (Panel T390HVN01.0 XL), TOSHIBA 50L4353RK (Panel LC500DUE (SF)(R1)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the B191-202 module provides for the use of the Power Factor Correction unit. The PFC circuit is a flyback converter based on the FAN7930 PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the TOSHIBA 32L6353RK device:
Installed matrix (LED panel) 96.32S14.001.
The matrix control uses the Timing Controller (T-CON) LC470EUN-SFF1_Control_ver1.0.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3362RP PWM controller (16).
The necessary supply voltages for all nodes of the TOSHIBA 32L6353RK TV are generated by the B191-202 power module or its analogs using B127H (DM0365 STB), FAN7930 (PFC), SSC9522S microcircuits and power switches of the P0550ATF, P1060ATF (PFC) type.
MainBoard - the main board (motherboard) is a 32L4300 module using CPU chips: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG and others.
The TDSS-G231D tuner provides television reception and channel tuning.

Brand: TOSHIBA, Model: 32L6353.
Briefly from the TV: LCD, LED backlight, 32 ", 1920x1080, 1080p Full HD, DVR, sound: 20W, HDMI: 4, Internet access, Wi-Fi, Smart TV.
The Toshiba official website has firmware (software update) for the models 32L6353RK (7.1.92.61.01.1), 32L6353DN (7.1.56.44.01.1), 32L6353DG (7.1.92.61.01.1), 32L6353DF (7.1.92.61.01.1), 32L6353DB ( 7.1.92.43.01.1).
The composition uses MainBoard 32L4300 REV1.02A and an LCD panel (matrix) 96.32S14.001.
Power Supply Unit (PSU) B191-202 D39 REV.D 4H.B1910.031 / D Power Supply.
TOSHIBA 32L6353 LED TV with 96.32S14.001 LCD, 32 "(81 cm) diagonal size of 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. This model uses side LED backlighting from Edge LED: The design and technical capabilities of the TV provide for watching broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD).
The 32L6353 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, JPEG.
The power of the acoustic system of sound 20 W (2x10 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi, Miracast. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 65 watts.
Overall dimensions: with stand 734x494x169 mm, without stand 734x438x69 mm.
TV Weight: with stand: 9.5 kg, without stand: 5.85 kg.
Attention! The TOSHIBA 32L6353 LED TV panel 96.32S14.001 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.