PHILIPS LED
Model: 49PUS7909 / 60
Chassis / Version: QV14.1E LA
Panel: LC490EQE-XGF1
LED backlight: 6922L-0128A 49 V14 ART5
T-CON: 6870C-0502A V14 TM120 UHD VER0.3
LED driver (backlight): integrated into PSU
Power Supply (PSU): FSP201-4FS01
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: 715RLPCB0000000401
IC MainBoard: CPU: NT72314, eMMC: H26M31003GMR
Tuner: DVB-T2 & SAT
Specifications 49PUS7909
PHILIPS 49PUS7909
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- PHILIPS 49PUS7909 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or blink, the TV does not respond to control buttons.
Often in such cases, the FSP201-4FS01 power supply module is faulty. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (N-FET TO-220F) and the rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) PFC, PWM, if they have no visible damage to the case and an open short circuit between the pins, are usually checked by replacing.
- There is no picture, but there is sound and all other TV functions are working. The image sometimes appears for a second immediately after switching on and disappears.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the 715RLPCB0000000401 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU: NT72314, eMMC: H26M31003GMR elements requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
If PHILIPS 49PUS7909 has no picture, but there is sound, often the LCD backlight of the LC490EQE-XGF1 simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image when the ambient light hits the screen successfully.
Replacing the LEDs requires disassembling the LC490EQE-XGF1 LCD panel - a process that requires experience and qualifications from the technician. We do not recommend doing such work on your own to owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV, light can be seen through the holes in the panel case.
In this case, the panel may also be faulty - damage to strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But often the main board MainBoard 715RLPCB0000000401 turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace the passage of LVDS signals from MainBoard 715RLPCB0000000401 with an oscilloscope, as well as synchronization signals to loops with drivers.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
Before changing the DVB-T2 & SAT tuner, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope......
We remind users again! Attempts to repair the PHILIPS 49PUS7909 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PHILIPS 49PUS7909 Chassis QV14.1E LA FOR MODELS : 48PFS8109/12, 48PFS8109/60, 48PFS8159/12, 48PFS8159/60, 48PFS8209/12, 48PFS8209/60, 49PUK7909/12 , 49PUS7909/12, 49PUS7909/60, 55PUS7909/12, 55PUS7909/60, 55PFS8109/12, 55PFS8109/60, 55PFS8159/12, 55PFS8159/60, 55PFS8209/12, 55PFS8209/60, 55PUS8809/12, 55PUS8809/60, 55PUS8909C/12 , 55PUS9109/12, 55PUS9109/60, 65PUS9109/12, 65PUS9109/60, 65PUS9809/12, 65PUS9809/60.
The appearance of the MainBoard 715RLPCB0000000401 is shown in the figure below:
715RLPCB0000000401
The main features of the PHILIPS 49PUS7909 device:
Installed matrix (LED panel) LC490EQE-XGF1.
Matrix control uses a Timing Controller (T-CON) 6870C-0502A.
A converter combined with a power supply is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the PHILIPS 49PUS7909 TV is carried out by the FSP201-4FS01 power module, or its analogs using PFC, PWM chips and N-FET TO-220F power switches.
MainBoard - the main board (motherboard) is a 715RLPCB0000000401 module using CPU chips: NT72314, eMMC: H26M31003GMR and others.
The DVB-T2 & SAT tuner provides reception of television programs and tuning to channels.
PHILIPS 49PUS7909 TV with LCD display LC490EQE-XGF1, diagonal size 49 "(124 cm) 16: 9. The required brightness of the screen of 400 cd / m2 is provided by LED backlighting. The display technology of the model is implemented with LED backlighting.
There is support for 3D images using polarization technology.
The LC490EQE-XGF1 sensor and MainBoard 715RLPCB0000000401 software are capable of realizing the highest UHD image quality at 3840x2160 4K UHD resolution.
TV model 49PUS7909 has built-in SMART software and Android operating system installed. The connection to the network can be carried out via Wi-Fi wireless connection. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and formation of a digital signal takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker sound system power 25 W. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), audio x2, component, SCART, RGB, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi 802.11n, Miracast ... A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080, 3840x2160. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.
The TV uses an FSP201-4FS01 power supply.
Overall dimensions: 1092x706x210 mm.
Attention! The LC490EQE-XGF1 panel of the PHILIPS 49PUS7909 LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.