PHILIPS LED
Model: 55PUS8809 / 60
Chassis / Version: QV14.1E LA
Panel: LTA550FJ01
T-CON: 715RLPCB0000000252
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): FSP279-5F01
MainBoard: 715RLPCB0000000303
IC MainBoard: 88PG867RB0, LNBH26LSPQR, TDA8296HN
Tuner: PE531AN
Specifications 55PUS8809
PHILIPS 55PUS8809
General recommendations for TV LCD LED repair
Possible manifestations of defects
- PHILIPS 55PUS8809 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
Most likely, in this case, the main switching power supply (SMPS) FSP279-5F01 is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
In some of these cases, the malfunction is caused by the lack of display backlight. 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
If PHILIPS 55PUS8809 has no picture, but there is sound, the backlight of the QV14.1E LA display often 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 external light hits the screen.
Replacing the LEDs requires disassembling the LCD panel QV14.1E - a process that requires experience and qualifications from the master. 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 you can see light 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 715RLPCB0000000303 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 715RLPCB0000000303 with an oscilloscope, as well as synchronizing 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.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the 715RLPCB0000000303 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). When repairing the MB board, you need to check its components 88PG867RB0, LNBH26LSPQR, TDA8296HN. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If the TV operates normally from external devices, but does not tune into TV channels, the PE531AN tuner may be defective. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Owners and users of the PHILIPS 55PUS8809 TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to complete non-repairability of the device!
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Additional MainBoard Repair
The appearance of the MainBoard 715RLPCB0000000303A is shown in the figure below:
715RLPCB0000000303A
The main features of the PHILIPS 55PUS8809 device:
Installed matrix (LED panel) LTA550FJ01.
Matrix control uses Timing Controller (T-CON) 715RLPCB0000000252.
A converter combined with the main board 715RLPCB0000000303 is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the PHILIPS 55PUS8809 TV is carried out by the FSP279-5F01 power module, or its analogs.
MainBoard - the main board (motherboard) is a 715RLPCB0000000303 module, using chips 88PG867RB0, LNBH26LSPQR, TDA8296HN and others.
Tuner PE531AN provides reception of TV programs and tuning to channels.
PHILIPS 55PUS8809 TV with LCD QV14.1E, diagonal size 55 "(140 cm) 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlighting. The display technology of the model is implemented with LED backlighting.
There is support for 3D images with active (shutter) separation technology of the right and left channels.
The QV14.1E sensor and MainBoard 715RLPCB0000000303 software are capable of realizing the highest UHD image quality at 3840x2160 4K UHD resolution.
TV model 55PUS8809 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 occurs in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p standards. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker sound system power 30 W (2x7.5 + 15 W). Uses NICAM stereo processing system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, HDMI x4, USB x3, Ethernet (RJ-45), Wi-Fi 802.11n, WiDi, Miracast. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used; 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 the FSP279-5F01 power supply.
Dimensions: with stand 1280x768x230 mm, without stand 1240x713x38 mm.
TV weight: with stand: 25.4 kg, without stand: 24.8 kg.
Attention! PHILIPS 55PUS8809 LED TV panel QV14.1E LA is an expensive and unreliable element.
Avoid any impacts 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.
