Technical description and composition of the TOSHIBA 42AV635DR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42AV635DR
Panel: LC420WUN-SBB1 LC420WUN-SBB1 75014116
T-CON: 75013628
Inverter (backlight): 75013627
Power Supply (PSU): 68-AL43A SRV2194WW
PWM Power: MIP2F2 (Standby), R2A20113SP (PFC), SSC9500 (PWM 16pin)
MainBoard: PE0719 U01AS
IC MainBoard: TAS5705PAPR, PCM1754DBQR, TMP91FW27UG (JZ)
Tuner: ENG37F01KF
Control: CT-90326
Specifications 42AV635D
TOSHIBA 42AV635DR
General recommendations for repairing TV LCD
TOSHIBA 42AV635DR TV, like any other, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. Sometimes, only by some signs can we determine the further direction of the localization of the malfunction. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the POWER UNIT, SRV2194WW power module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the likelihood of an avalanche or thermal breakdown.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 42AV635DR has no image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Repair of the inverter 75013627 can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety during depressurization of lamps, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Diagnosis and repair of the motherboard U01AS MAIN (PE0719) is carried out by checking the performance of power stabilizers or updating the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its TAS5705PAPR PCM1754DBQR TMP91FW27UG (JZ) chips and other possible faulty components.
Before replacing the ENG37F01KF tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Attention to the owners! Attempts to self-repair the TOSHIBA 42AV635DR TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba - 32/37/42RV633/635DR Main PE0719 schematic diagram
The appearance of MainBoard PE0719 is shown in the figure below:PE0719
PE0719 can be used in TVs:
TOSHIBA 32AV635DR (Panel LC320WXN (SB)(B1)), TOSHIBA 32RV633DR (Panel LTA320HA04), TOSHIBA 32RV635DR (Panel LTA320HA04), TOSHIBA 42AV633DR (Panel LC420WUN (SB)(B1) 75014116), TOSHIBA 42AV635DR (Panel LC420WUN-SBB1 LC420WUN-SBB1 75014116), TOSHIBA 42RV635D (Panel LC420WUN (SB)(G1)).
PSU Advanced
The 42AV635DR model uses a 68-AL43A power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the R2A20113SP PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the TOSHIBA 42AV635DR device:
Installed matrix (LCD panel) LC420WUN-SBB1 LC420WUN-SBB1 75014116.
The matrix control uses the Timing Controller (T-CON) 75013628.
An inverter 75013627 is used to power the backlight.
The necessary supply voltages for all nodes of the TOSHIBA 42AV635DR TV are generated by the 68-AL43A power module, or its analogs using MIP2F2 (Standby), R2A20113SP (PFC), SSC9500 (PWM 16pin) microcircuits.
MainBoard - the main board (motherboard) is a PE0719 module, using TAS5705PAPR, PCM1754DBQR, TMP91FW27UG (JZ) and others.
The ENG37F01KF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUN-SBB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering)
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V
Trademark: TOSHIBA, Model: 42AV635D.
Short from TV: LCD, 42 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 4.
For the 42AV635D model, the official website has firmware (software update) version 2.1.77.2.
The composition uses MainBoard PE0719 U01AS and an LCD panel (matrix) LC420WUN-SBB1.
Power Supply Unit (PSU) 68-AL43A SRV2194WW Power Supply.
TOSHIBA 42AV635D LCD TV with LC420WUN-SBB1 LCD, 42 "(106 cm) diagonal display in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 1400: 1. Dynamic contrast ratio of 15000: 1 is achieved by special control of the backlight. The design and technical capabilities of the TV provide for watching broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD). Input high astotny or video signal can be processed by analog systems, PAL, SECAM, NTSC Image processing and generation of the digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:.. 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, audio x4, S-Video, component, SCART x2, RGB, VGA, HDMI x4, USB. 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 standards.
The power consumed by the TV in the operating mode from the network is 205 watts.
Overall dimensions: with stand 1009x689x263 mm, without stand 1009x649x90 mm.
TV Weight: with stand: 20.5 kg, without stand: 18.9 kg.
Attention! The TOSHIBA 42AV635D LCD TV panel LC420WUN-SBB1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!