Technical description and composition of the TOSHIBA 40RL955RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 40RL955RB
Panel: LTA400HM22 T03
T-CON: GA_60HZ_FHD_V0.3 P25533D2H09EL
LED driver (backlight): SSL400_0E1B Rev0.1
PWM LED driver: SSL110SN
MOSFET LED driver: MDD4N20Y
Power Supply (PSU): N150A002L REV01 N11-150P1A V71A00022901
PWM Power: A6069, FAN6961 (PFC), L6577B
MainBoard: PE1070 H V28A00140701
IC MainBoard: CPU: MSD381USV-V6; DRAM: K4B1G1646G-BCK0; NAND Flash: TC58NVG1S3E; SPI Flash: MX25L1606EM2I-12G; EEPROM: M24256; SOUND: TAS5708;
Tuner: ENGS7305D5F
Specifications 40RL955
TOSHIBA 40RL955RB
General repair guidelines for TV LCD LED
TOSHIBA 40RL955RB TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the power supply module V71A00022901 N150A002L REV01 N11-150P1A is faulty., External manifestations may be different, for example, the TOSHIBA 40RL955RB does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
Sometimes the TOSHIBA 40RL955RB 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 LTA400HM22 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.
A break in the line of LEDs connected in series cannot be detected with a multimeter or tester without disassembling the panel. To open all the transitions, several tens of volts are needed, and it is best to use a current source for such purposes.
Diagnostics and repair of the motherboard PE1070 H V28A00140701 is carried out by checking the operability of the stabilizers or power converters of the module chips. In some cases, a software update is required.
Before replacing the tuner ENGS7305D5F, if there is no tuning to the channels, first you need to check the supply voltage at its terminals, including the power supply of varicaps (30-33V).
Attention! For users and owners of 40RL955RB TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
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 N150A002L power module is installed on the 40RL955RB TV using the PFC (Power Factor Correction) circuitry, which acts as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the FAN6961 PWM controller does not allow the electrolytic capacitor of the input rectifier filter to be connected directly to the network directly through open diodes, when the value of the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Key Features of the TOSHIBA 40RL955RB:
Installed matrix (LED-panel) LTA400HM22 T03.
The matrix control uses the Timing Controller (T-CON) GA_60HZ_FHD_V0.3.
The LED driver SSL400_0E1B is used to power the backlight LEDs, it is controlled by the SSL110SN PWM controller. As power elements of the LED driver, keys of the MDD4N20Y type are used.
The necessary supply voltages for all nodes of the TOSHIBA 40RL955RB TV are generated by the power module N150A002L, or its analogs using A6069, FAN6961 (PFC), L6577B 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; EEPROM: M24256; SOUND: TAS5708; and others.
The ENGS7305D5F tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HM22
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 2%)
Brightness: 350 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (10-bit), CIE1931 70%
Response Time: 10 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V
Trademark: TOSHIBA, Model: 40RL955.
Shortly from the TV: LCD, LED backlight, 40 ", 1920x1080, 1080p Full HD, DVR, sound: 20W, HDMI connectors: 3, Internet access.
For the 40RL955RB model, the official website has firmware (software update) version 6.9.9E.1.
The composition includes MainBoard PE1070 H V28A00140701 and an LCD panel (matrix) LTA400HM22 T03.
Power Supply Unit (PSU) N150A002L REV01 N11-150P1A V71A00022901 Power Supply.
TOSHIBA 40RL955 LED TV with LTA400HM22 LCD, 40 "(102 cm) diagonal display in 16: 9 format. The required screen brightness of 350 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’s display manufacturing technology uses LED LED backlighting, and the TV’s design and technical capabilities provide for watching broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the 1080p standard (Full HD). The 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, WMA, 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), AV, 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.
The power consumed by the TV in the operating mode from the network is 48 watts.
Overall dimensions: with stand 923x612x216 mm, without stand 923x555x38 mm.
TV Weight: 14 kg.
Attention! The LTA400HM22 T03 panel of the TOSHIBA 40RL955 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.