Technical description and composition of the TOSHIBA 32AV52R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32AV52R
Chassis / Version: STA40T
Panel: LTA320AP01
T-CON: 320AP03C2LV0.1 LJ94-02746Y; LMX6322T1, MAXIM5678E, TPS65160A, EM638325TS-7G
Inverter (backlight): SSI320_4UA01 LJ97-02080A
Power Supply (PSU): PK101V0980I
MainBoard: STA40T VTV-L4008
Tuner: ENG36E18KF
Control: Remote: CT-90302
Appearance
TOSHIBA 32AV52R
General recommendations for repairing TV LCD
Possible malfunctions
- TOSHIBA 32AV52R does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Failure in such cases should begin to be sought in the PK101V0980I power supply circuits. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the STA40T motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software).
If the TV works normally from external devices, but does not tune into television channels, the ENG36E18KF tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to independently repair the TOSHIBA 32AV52R TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Repair MainBoard
The appearance of the MainBoard STA40T is shown in the figure below:
STA40T
The appearance of the power supply
Main features of the TOSHIBA 32AV52R device:
Installed matrix (LCD panel) LTA320AP01.
The matrix control uses the Timing Controller (T-CON) 320AP03C2LV0.1.
To power the backlight used inverter SSI320_4UA01.
The necessary supply voltages for all nodes of the TOSHIBA 32AV52R TV are generated by the PK101V0980I power supply module, or its analogs.
MainBoard - the main board (motherboard) is an STA40T module.
The ENG36E18KF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins