Technical description and composition of the PHILIPS 46PFL8605H TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 46PFL8605H / 12
Chassis / Version: Q551.1E
Panel: LK460D3LB23
T-CON: RUNTK4513TPZA
LED driver (backlight): integrated into PSU
Power Supply (PSU): PLDG-P977C
MainBoard: 3104_313_64512 314302714501 3104 313 64512
IC MainBoard: TPA3123D2, SiI9287BCNU, ST1S10PH, LD3985M25, TPS54283PWP
Tuner: TH2683
Specifications 46PFL8605H
PHILIPS 46PFL8605H
General repair guidelines for TV LCD LED
Possible malfunctions
- The PHILIPS 46PFL8605H does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Failure in such cases should begin to be sought in the PLDG-P977C power supply circuits. It is then necessary to measure its output voltages and, if they are absent, it is necessary to check the power switches and rectifier diodes of the converters for a short-circuit probability.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 3104_313_64512 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - TPA3123D2, SiI9287BCNU, ST1S10PH, LD3985M25, TPS54283PWP. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the tuner TH2683, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the PHILIPS 46PFL8605H TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of MainBoard 3104_313_64512 is shown in the figure below:3104_313_64512
3104_313_64512 can be used in TVs:
PHILIPS 40PFL8605H/60 (Panel LK400D3LB23 code 263 p/n: 932227887682), PHILIPS 40PFL9705H/60 (Panel LK400D3LB13 code 258), PHILIPS 46PFL9705H/60 (Panel LK460D3LA73), PHILIPS 46PFL8605H/12 (Panel LK460D3LB23).
Main features of the PHILIPS 46PFL8605H device:
Installed matrix (LED-panel) LK460D3LB23.
The matrix control uses the Timing Controller (T-CON) RUNTK4513TPZA.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the PHILIPS 46PFL8605H TV are generated by the PLDG-P977C power supply module or its analogs.
MainBoard - the main board (motherboard) is a 3104_313_64512 module, using TPA3123D2, SiI9287BCNU, ST1S10PH, LD3985M25, TPS54283PWP and other chips.
The TH2683 tuner provides TV reception and channel tuning.