Technical description and composition of the PHILIPS 22PFT4000 TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 22PFT4000 / 60
Chassis / Version: TPN15.1ELA
Panel: TPM215HW01
T-CON: M215HGE P02 rev.C3 M215HGE-L21-X + C
LED driver (backlight): integrated into MainBoard
PWM LED driver: PF7708AS
MOSFET LED driver: AO4486
Power Supply (PSU): 715G6863-P01-001-002M
PWM Power: PF6003AG (OB2273)
MOSFET Power: TK5A65D
MainBoard: 715G6947-M01-000-004K
IC MainBoard: CPU: NT72453; NAND Flash: MX30LF1G08AA-T1 1Gb; SOUND: AUDIO AD87588-LG48NAY
Tuner: ST42CS-2-E
Technical Specifications 22PFT4000
PHILIPS 22PFT4000
General repair guidelines for TV LCD LED
Possible manifestations of defects
- PHILIPS 22PFT4000 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.
Often in such cases, the 715G6863-P01-001-002M power module is faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (TK5A65D) and rectifier diodes for a probable short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more 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 (PWM) PF6003AG (OB2273) microcircuits are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The most likely in these cases is a malfunction of the LED 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 check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode 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 motherboard 715G6947-M01-000-004K 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 they require checking or replacing (if necessary) the elements of the MainBoard - CPU: NT72453; NAND Flash: MX30LF1G08AA-T1 1Gb; SOUND: AUDIO AD87588-LG48NAY. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
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.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Main features of the PHILIPS 22PFT4000 device:Installed matrix (LED panel) TPM215HW01.
The matrix control uses the Timing Controller (T-CON) M215HGE.
To power the backlight LEDs, a converter is used, combined with the main board 715G6947-M01-000-004K, controlled by the PF7708AS PWM controller. As the power elements of the LED driver, keys of the type AO4486 are used.
The necessary supply voltages for all nodes of the PHILIPS 22PFT4000 TV are generated by the 715G6863-P01-001-002M power module, or its analogs using PF6003AG (OB2273) microcircuits and TK5A65D type power switches.
MainBoard - the main board (motherboard) is a 715G6947-M01-000-004K module, using CPU chips: NT72453; NAND Flash: MX30LF1G08AA-T1 1Gb; SOUND: AUDIO AD87588-LG48NAY and others.
The ST42CS-2-E tuner provides television reception and channel tuning.
