Technical description and composition of the PHILIPS 42PFL6705H TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 42PFL6705H / 60
Chassis / Version: Q551.1E LA
Panel: LC420EUH (SC) (G1)
Power Supply (PSU): PLDF-P991A
MainBoard: 3104_313_64731 - 3104 313 64731/314302714961
IC MainBoard: TL2429MC, TPA23D2
Tuner: TH2603
Specifications 42PFL6705H
PHILIPS 42PFL6705H
General repair guidelines for TV LCD LED
It is advisable to start repairing the PHILIPS 42PFL6705H / 60 TV with a careful external examination of both internal and external elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. 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.
Malfunctions of the PLDF-P991A power supply module can be expressed in different ways, for example, PHILIPS 42PFL6705H does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells 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 broken resistors in its bundle.
Sometimes the PHILIPS 42PFL6705H TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LC420EUH (SC) (G1) panel LED backlight converter, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
Motherboard 314302714961 138542 EH 140.3 PL5.D 5112552 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.
Owners and users of the PHILIPS 42PFL6705H TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences, which can lead to complete non-repairability of the device!
Service manual and schematic diagram 42PFL6705H/60 Chassis Q551.1E LA
The appearance of MainBoard 3104_313_64731 is shown in the figure below:3104_313_64731
3104_313_64731 can be used in TVs:
PHILIPS 42PFL6705H / 60 (Panel LC420EUH (SC) (G1)), PHILIPS 42PFL6805H / 60 (Panel LC420EUH (SC) (G1)).
The appearance of the power supply
Main features of the PHILIPS 42PFL6705H device:
Installed matrix (LED-panel) LC420EUH (SC) (G1).
The formation of the necessary supply voltages for all nodes of the PHILIPS 42PFL6705H TV is carried out by the PLDF-P991A power supply module, or its analogs.
MainBoard - the main board (motherboard) is a module 3104_313_64731, using microchips TL2429MC, TPA23D2 and others.
The TH2603 tuner provides TV reception and channel tuning.