Technical description and composition of the TOSHIBA 42AV501PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42AV501PR
Panel: LC420WX7-SLC1 // LC420WXN-SAB1
T-CON: 75009703 // 75013100
Inverter (backlight): 75009702 // 75013089
Mainboard: PE0484
IC MainBoard: TDA8891H1 / N1B TDA15451HV / N1B00 TDA15451 LPC924F TL2417
Tuner: TAEA-G081D
Appearance
TOSHIBA 42AV501PR
General recommendations for repairing TV LCD
It is advisable to start repairing the TOSHIBA 42AV501PR 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. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In cases when the TOSHIBA 42AV501PR TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up or blink, and there are no sounds and no signs of operability at all, the power module is most likely faulty or, which happens much less often, there is no processor power on the motherboard. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of their operation.
If there is no image when you turn on the TOSHIBA 42AV501PR, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Repair of the inverter 75009702 // 75013089 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.
When disabling protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Once again, remind users! Attempts to independently repair the TOSHIBA 42AV501PR TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 42AV501PR PE0484, PE0486, PE0643. Service manual and schematic diagram
FIRMWARE FOR SPI FLASH -----------> , EEPROM TOSHIBA 42AV501
The appearance of MainBoard PE0484 is shown in the figure below:PE0484
PE0484 can be used in TVs:
TOSHIBA 32AV500PR (Panel LC320WXN (SB)(B1)), TOSHIBA 32AV500PSR (Panel LC320WXN (SB)(B1)), TOSHIBA 32AV501PR (Panel LK315T3LA31), TOSHIBA 32AV502PR (Panel LK315T3LA31 (75012574)), TOSHIBA 37AV502PR (Panel LC370WXN(SA)(C2) 75012583), TOSHIBA 42AV500PSR (Panel LC420WXN (SA)(B1)), TOSHIBA 42AV501PR (Panel LC420WX7-SLC1), TOSHIBA 42AV502PR (Panel LC420WXN-SAB1), TOSHIBA 37AV500PR (Panel AX094B002B).
Main features of the TOSHIBA 42AV501PR device:
Installed matrix (LCD panel) LC420WX7-SLC1 or LC420WXN-SAB1.
The matrix control uses the Timing Controller (T-CON) 75009703.
The inverter 75009702 is used to power the backlight.
The required supply voltage for all nodes of the TOSHIBA 42AV501PR TV provides a switching power supply.
MainBoard - the main board (motherboard) is a PE0484 module, using TDA8891H1 / N1B TDA15451HV / N1B00 TDA15451 LPC924F TL2417 and others.
The TAEA-G081D tuner provides TV reception and channel tuning.