Technical description and composition of the TOSHIBA 32RL955RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32RL955RB
Panel: LTA320HN03 T03
LED backlight: LJ64-03204A 2 * 36 led
LED driver (backlight): SSL320 3E2B Rev0.0
PWM LED driver: SSL100SN
MOSFET LED driver: STA3250, APM4015P, SF10A400HD
Trans LED driver: KL-040-12516a-KD
Power Supply (PSU): DPS-115EP V71A00023000
PWM Power: STR-A6069H (Standby), 1608B (PFC), DDA014
MainBoard: PE1070 V28A00140701
IC MainBoard: CPU: MSD381USV-V6; DRAM: K4B1G1646G-BCK0; NAND Flash: TC58NVG1S3E; SPI Flash: MX25L1606EM2I-12G
Tuner: ENGS7305D5F
Specifications 32RL955
TOSHIBA 32RL955RB
General repair guidelines for TV LCD LED
Repair and diagnostics of any electronic device, in particular TOSHIBA 32RL955RB, it is advisable to start with a careful external examination of internal and external elements. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
Sometimes the TOSHIBA 32RL955RB TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the DPS-115EP V71A00023000 general power supply module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). Diagnostics and repair of the common power supply should always begin with a check of 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 a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Sometimes the TOSHIBA 32RL955RB TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LTA320HN03 T03 panel backlight LED converter, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with 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.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In cases where there is no tuning to the local television channels, you should make sure that there is a varicap supply voltage (30-33V) and other supply voltages at the terminals of the ENGS7305D5F tuner.
Attention to the owners! Attempts to self-repair the TOSHIBA 32RL955RB TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba - 23RL933RB, 32RL933RB, 40RL933RB , 23RL953RB, 32RL953RB, 40RL953RB. Main PE1070
The appearance of the MainBoard PE1070 is shown in the figure below:PE1070
PE1070 can be used in TVs:
TOSHIBA 23RL933RB (Panel LC230EUE SE A1), TOSHIBA 32RL933RB (Panel LTA320HN03 T03), TOSHIBA 32RL955RB (Panel LTA320HN03 T03), TOSHIBA 40RL955RB (Panel LTA400HM22 T03), TOSHIBA 32RL953RB (Panel LTA320HN03), TOSHIBA 40RL933RB (Panel LTA400HM22 LJ96-06007A).
PSU Advanced
The DPS-115EP power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on a 1608B PWM controller that evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the TOSHIBA 32RL955RB device:
Installed matrix (LED panel) LTA320HN03 T03.
To power the backlight LEDs, the SSL320 LED driver is used, it is controlled by the SSL100SN PWM controller. A transformer KL-040-12516a-KD is installed in the converter of the LED driver. As the power elements of the LED driver, keys of the type STA3250, APM4015P, SF10A400HD are used.
The necessary supply voltages for all nodes of the TOSHIBA 32RL955RB television are generated by the DPS-115EP power module, or its analogs using the STR-A6069H (Standby), 1608B (PFC), DDA014 microcircuits.
MainBoard - the main board (motherboard) is a PE1070 module, using CPU chips: MSD381USV-V6; DRAM: K4B1G1646G-BCK0; NAND Flash: TC58NVG1S3E; SPI Flash: MX25L1606EM2I-12G and others.
The ENGS7305D5F tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320HN03-T
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 5.5%)
Brightness: 400 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (10-bit), CIE1931 70%
Response Time: 16 (Max.) (Tr + Td)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V
Trademark: TOSHIBA, Model: 32RL955.
Briefly from the TV: LCD, LED backlight, 32 ", 1920x1080, 1080p Full HD, DVR, sound: 20W, HDMI: 3, Internet access, Smart TV.
For the 32RL955RB model, the official website has firmware (software update) version 6.9.9E.1.
The composition uses MainBoard PE1070 V28A00140701 and an LCD panel (matrix) LTA320HN03 T03.
Power Supply Unit (PSU) DPS-115EP V71A00023000 Power Supply.
TOSHIBA 32RL955 LED TV with LTA320HN03 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 1,000,000: 1 is achieved by special control of the LEDs. V This model uses side illumination from Edge LEDs.The design and technical capabilities of the TV include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical resolution according to the standard 1080p (Full HD).
The 32RL955 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, MPEG4, Xvid, DivX, MKV, 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), component, SCART, VGA, HDMI x3, USB, Ethernet (RJ-45). 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.
Overall dimensions: with stand 735x506x206 mm, without stand 735x450x38 mm.
TV Weight: 9.5 kg.
Attention! The LTA320HN03 T03 panel of the TOSHIBA 32RL955 LED TV 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.