Technical description and composition of the PHILIPS 48PFT4100 TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 48PFT4100 / 60
Chassis / Version: TPN15.1E LA
Panel: TPT480LS-HN08.S REV.SG01A
LED backlight: EVT LBM480P1101-T-1
LED driver (backlight): integrated into PSU
PWM LED driver: LD7890GS
MOSFET LED driver: P3710BTF
Power Supply (PSU): 715G6338-P01-002-002M
PWM Power: LD7752B, LD7591T (PFC), LCS700LG
MOSFET Power: TK16A60W
MainBoard: 715G6947-M01-000-004Y
IC MainBoard: CPU: NT72453, NAND Flash: MX30LF1G08AA-T1, AUDIO: AD87588
Tuner: ST42CS-2-E
Specifications 48PFT4100
PHILIPS 48PFT4100
General repair guidelines for TV LCD LED
Possible malfunctions
- PHILIPS 48PFT4100 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.
In such cases, the 715G6338-P01-002-002M power supply is usually faulty. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches (TK16A60W) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits (PWM) LD7752B, LD7591T (PFC), LCS700LG are usually checked by replacing with new ones, or obviously working.
- 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 can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 715G6947-M01-000-004Y motherboard should be started by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: NT72453, NAND Flash: MX30LF1G08AA-T1, AUDIO: AD87588. BGA chip malfunctions are usually easy to detect by warming up.
The malfunction of the ST42CS-2-E tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Owners and users of the PHILIPS 48PFT4100 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual and schematic diagram ----------------> PHILIPS 48PFT4100 Chassis TPN15.1E LA
The appearance of the MainBoard 715G6947-M01-000-004Y is shown in the figure below:715G6947-M01-000-004Y
715G6947-M01-000-004Y can be used in TVs:
PHILIPS 40PFT4100/60 (Panel TPT400LA-HN02.S Rev-SS01B code 018), PHILIPS 24PHT4000/60 (Panel TPM236WH2-BJ1P03.N REV.LC1E), PHILIPS 40PFT4101/60 (Panel TPT4001A-HN02.S / TPN16.2ELA), PHILIPS 32PHT4100/60 (Panel TPT315B5-0TU3A.Q code: 003).
The appearance of the power supply
Main features of the PHILIPS 48PFT4100 device:
The matrix (LED panel) TPT480LS-HN08.S REV.SG01A is installed.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the LD7890GS PWM controller. As the power elements of the LED driver, keys of the P3710BTF type are used.
The necessary supply voltages for all nodes of the PHILIPS 48PFT4100 TV are generated by the 715G6338-P01-002-002M power module, or its analogs using LD7752B, LD7591T (PFC), LCS700LG microcircuits and TK16A60W power switches.
MainBoard - the main board (motherboard) is a module 715G6947-M01-000-004Y, using CPU chips: NT72453, NAND Flash: MX30LF1G08AA-T1, AUDIO: AD87588 and others.
The ST42CS-2-E tuner provides television reception and channel tuning.