Technical description and composition of the TOSHIBA 32AV635DR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32AV635DR
Chassis / Version: PE0719 VF
Panel: LC320WXN (SB) (B1)
Inverter (backlight): KLS-EE32PIH
Power Supply (PSU): SRV2169WW
PWM Power: SSC9500, FA5501AN (PFC), MIP2F2 (Standby)
MainBoard: PE0719 B V28A000938A1 ENG37F01
IC MainBoard: TAS5705PAPR, PCM1754DBQR, TMP91FW27UG (JZ)
Tuner: ENG37F01KF
Specifications 32AV635D
TOSHIBA 32AV635DR
General recommendations for repairing TV LCD
It is advisable to start repairing the TOSHIBA 32AV635DR TV with an external examination of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. 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.
Sometimes the TOSHIBA 32AV635DR 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 common power module SRV2169WW analogue PE0531A, DPS276. 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 possibility of an avalanche or thermal breakdown.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters 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 MIM2F2 SSc9500 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.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
In cases where the TOSHIBA 32AV635DR TV has lost an image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Often attempts to repair the inverter are hampered by the fact that the fault diagnosis is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
In cases of attempts to repair the ENG37F01 motherboard, it is necessary to check the operability of the power supply circuits of the microcircuits and, if possible, update the software (software).
For owners of the 32AV635DR TV, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV635D Ver. 2.01, PE0719 PE0720 PE0721 PE0533
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
According to the conditions of compliance with modern world standards for household switching power supplies, the SRV2169WW module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FA5501AN 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 32AV635DR device:
Installed matrix (LCD panel) LC320WXN (SB) (B1).
To power the backlight used inverter KLS-EE32PIH.
The necessary supply voltages for all nodes of the TOSHIBA 32AV635DR TV are generated by the SRV2169WW power module or its analogs using SSC9500, FA5501AN (PFC), MIP2F2 (Standby) 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.
TOSHIBA 32AV635D LCD TV with LC320WXN LCD, 32 "(81 cm) diagonal size in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 1200: 1 Dynamic contrast ratio of 18000: 1 is achieved by special control of the backlight.You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: JPEG.
The power of the sound system 20 W (2x10 W) provides 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 x3, 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.
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 118 watts.
Overall dimensions: with stand 786x570x258 mm, without stand 786x525x86 mm.
TV Weight: with stand: 12 kg, without stand: 11 kg.
Attention! The TOSHIBA 32AV635D LCD TV panel LC320WXN (SB) (B1) is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!