Technical description and composition of the PHILIPS 42PF9731D TV, panel type and applicable modules. The composition of the modules.PHILIPS
Model: 42PF9731D / 10
Chassis / Version: FJ3.0E LA
Panel: LC420W42 (SL) (A1)
Power Supply (PSU): 3H133WI, 42 PFL PSU + NO-AUD 2K6 FOR HD
MainBoard: 310432845251 3104 313 61452
Control: 2422 549 01325
Specifications 42PF9731D
PHILIPS 42PF9731D
General recommendations for repairing TV LCD
PHILIPS with the FJ3.0E LA chassis, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before the necessary measurements are taken. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
If PHILIPS 42PF9731D does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a 3H133WI, 42 PFL PSU + NO-AUD 2K6 FOR HD power supply module malfunctioning. In some cases, only the processor power regulator may be faulty. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If there is no image when you turn on the PHILIPS 42PF9731D, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or the power converter (inverter) are malfunctioning. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. When diagnosing a malfunction of the inverter with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
Motherboard 310432845251 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service manual and schematic diagram 42PF9731D/10 Chassis FJ3.0E LA
FOR MODELS: 32PF9531/10, 32PF9631D/10, 32PF9731D/10, 37PF9731/69, 37PF9731D/10, 42PF9641D/10, 42PF9731D/10, 42PF9831/69, 42PF9831D/10
The appearance of MainBoard 310432845251 is shown in the figure below:310432845251
The appearance of the power supply
Main features of the PHILIPS 42PF9731D device:
Installed matrix (LCD panel) LC420W42 (SL) (A1).
The necessary supply voltages for all nodes of the PHILIPS 42PF9731D TV are generated by the 3H133WI power module or its analogs.
MainBoard - the main board (motherboard) is a module 310432845251