Repair of PHILIPS 32PHS4132 TV set
Technical description and components of the TV set PHILIPS 32PHS4132, type of panel and modules used. Module composition.
PHILIPS LED
Model: 32PHS4132/60
Chassis/Version: TPN17.1E LA
Panel: TPT315B5-FHBN0.K
LED driver (backlight): integrated into PSU
PWM LED driver: PF7708BS
MOSFET LED driver: MTBA5N10J3
Power Supply (PSU): 715G7734-P01-005-002H
PWM Power: PF6005AS
MOSFET Power: TK6A65D
MainBoard: 715G8659-M01-000-004Y
IC MainBoard: CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD
Đ¢uner: TDSY-G430D
Possible Manifestations of Defects
- PHILIPS 32PHS4132 TV does not turn on, does not respond to the remote control and control panel buttons, the indicators are not lit or flashing.
Usually with such manifestations defect is caused by faulty elements in the main power module 715G7734. It is necessary to measure its output voltages, and in case of their absence (complete or partial), you should check the serviceability of the power keys (TK6A65D) converters and rectifier diodes for possible short circuit.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can work in the short-circuit emergency mode without output voltages, and at short circuit in the elements of the primary circuit most often the line fuse and more rarely the current sensor in the source of the key break immediately.
Breakdown of power switches (MosFet) in pulse sources is sometimes caused by faults in other circuit elements, for example, in the circuits supplying the PWM controller, frequency-retaining or damping circuits, as well as in the Negative Feedback (NF) stabilization circuits. PWM regulators PF6005AS, if they do not have visible housing damage and outright short circuit between pins, are usually checked by replacement.
- No picture, but there is sound and all other functions work. Sometimes when switching on the image appears for a second and then disappears.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
Often in such cases there is no backlighting of the LED panel. The cause may be found in the failure of the LEDs, in violation of the contact connections of the LED strips, or in their power supply (LED-driver).
It is impossible to check the LED strips for breakage without disassembling the panel with a multimeter or a tester. For this purpose, you need to open all the PN-junctions connected in series and will need a voltage of about tens of volts, and ideally - a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light up a single 3 volt LED slightly in the forward direction. In the case of twin 6-volt LEDs, the PN junction of its safety regulator may be a good indicator. Faulty LEDs will either have a broken regulator or a short circuit.
If the PHILIPS 32PHS4132 has no picture but has sound, often the TPT315B5-FHBN0.K display backlight simply does not work. Moreover, in LED TVs usually fail the LEDs inside the panel, less often the LED-driver.
In such cases you can see a faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD-panel TPT315B5-FHBN0.K - the process requiring a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who do not have experience in LCD panel repair
If there is no image, but backlighting works - the screen becomes slightly lighter when you turn on the TV, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard 715G8659-M01-000-004Y is defective, also software failure is possible.
Then first it is necessary to check the panel power 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, you need to trace by oscilloscope the LVDS signals from MainBoard 715G8659-M01-000-004Y, as well as synchronizing signals to driver stubs.
Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there is no significant damage to the panel stubs and slats.
- The TV does not go into the operating mode, the remote control does not respond. Front panel LED's are either constantly on or blinking.
Repair or diagnostic of the motherboard 715G8659-M01-000-004Y should begin with checking the stabilizers and power converters necessary to power the chips and matrix. Software (software) should be updated or replaced if necessary. Sometimes elements of MainBoard should be checked or replaced (if necessary) - CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD. If a BGA processor is used, its malfunction is usually detected by local heating.
Before replacing the TDSY-G430D tuner if you cannot tune to the TV channels, make sure the supply voltages are present and measure them on the respective pins of the tuner and check the software for correctness. The tuner-to-processor communication pulses can be checked with an oscilloscope
Please remember! Attempts to repair PHILIPS 32PHS4132 TV-set by yourself, in the absence of necessary qualification and experience are strongly not recommended and are fraught with negative consequences, up to the full unrepairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PHILIPS 32PHS4032 Chassis TPN17.1E EU.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 22PFS4232/12, 43PFT4112/05, 22PFT4232/12, 43PFT4112/12, 32PFS4132/12, 24PFS4032/12, 32PFT4132/05, 24PFT4032/12, 32PFT4132/12, 24PFT4032/60, 32PFT4132/60, 24PHS4032/12, 32PHS4132/12, 24PHT4032/05, 32PHT4132/05, 24PHT4032/12, 32PHT4132/12, 24PHT4032/60, 32PHT4132/60, 32PHS4032/12, 43PFS4132/12, 32PHT4032/12, 43PFT4132/05, 32PHT4032/60, 43PFT4132/12, 22PFS4022/12, 43PFT4132/60, 22PFT4022/05, 49PFS4132/12, 22PFT4022/12, 49PFT4132/12, 22PFT4022/60, 32PHS4112/12, 24PFS4022/12, 32PHT4112/05, 24PFT4022/12, 32PHT4112/12, 24PFT4022/60, 39PHS4112/12, 24PHS4022/12, 39PHT4112/05, 24PHT4022/05, 39PHT4112/12, 24PHT4022/12, 43PFS4112/12. Chassis TPN17.1E EU
Refinement after repair of the backlight. 715G7734-P01-005-002H, PF7708BS. Information from the master.
Reduce backlight current from 1 A to 800 mA - removed one of the resistors (R8653) in the LED driver current sensor on the power supply board 715G7734-P01-005-002H.
Driver current limitation. 715G7734, PF7708BS. General Information.
The driver chip is PF7708BS, the current sensor is five resistors R8652, R8653, R8654, R8655, R8656 connected pa in the LED current circuit on the 715G7734-xx-xx-xxx power supply board.
To reduce the backlight current you can remove one or two of the current sensor resistors in the 715G7734 power supply.
715G7734 current backlight
DOWNLOAD-----------> PDF document PF7708B is attached.
Ways to limit the current in LED backlight drivers:
There
is a lot of information on the Internet about ways to limit the current
in the LED backlighting for different TVs and LED drivers. A lot of it
is written plausibly but sometimes it is written by people far from
electronics in order to publish any popular content on hot topics to
boost web-sites ratings.
It's impossible to talk about each case
separately within one article, because even similar models may have
different panels and different boards with their own driver variants.
But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.
Other popular, complex and controversial current limit cases will be published as information becomes available.
There are three basic ways to reduce the backlight current.
1. By increasing the resistance of the LED current sensor - a low-resistance measuring resistor in the cathode (LED-) circuit.
2. Increasing the ratings of the resistors on the ISET (current setting) input of the LED driver chip.
3. changing the resistor ratings in the divider on the ADIM (Dimming) control input.
The fundamental difference between input ISET and ADIM is that ISET - input inverted, as FB, and ADIM - direct.
More on MainBoard Repair
The MainBoard 715G8659-M01-000-004Y is shown in the figure below:
715G8659-M01-000-004Y
The main features of the PHILIPS 32PHS4132 device:
TPT315B5-FHBN0.K matrix (LED panel) is installed.
To power the LED backlight applied converter, combined with a power supply, controlled by PWM controller PF7708BS. As the power elements of LED-driver are used switches type MTBA5N10J3.
Required supply voltages for all PHILIPS 32PHS4132 TV assemblies are generated by power supply module
715G7734-P01-005-002H or its analogues using PF6005AS chips and TK6A65D type power keys.
MainBoard - the main board (motherboard) is a module 715G8659-M01-000-004Y, with the use of chips CPU: NT72461, NAND: W29N01HVSINF, AUDIO: TAS5753MD and others.
The TDSY-G430D tuner provides TV program reception and channel tuning.
Instructions and updates
Software update (firmware).
Version: 000.002.180.000 ZIP file, 42.3 MB November 10, 2020
Russian version.
Documentation:
Quick Start Guide PDF file, 1.6 MB December 1, 2017.
Brochure Version: 2.1.1 PDF file, 479.7 kB July 19, 2019
Operating instructions PDF file, 2.9 MB December 1, 2017.
Files can be downloaded from the manufacturer's website for the 32PHS4132/60 model.
TV PHILIPS 32PHS4132 with LCD TPT315B5-FHBN0.K, 31.5" (80 cm) diagonal size 16:9. The required brightness of 280 cd/m² screen is provided by an LED backlight. In the LCD-panel is implemented a backlight of Direct LEDs.
The TPT315B5-FHBN0.K matrix and MainBoard software 715G8659-M01-000-004Y enable high quality HD viewing at 1366x768 pixels in 720p (HD Ready). Supported media file formats are MP3, WMA, MPEG4, HEVC (H.265), MKV, JPEG.
The sound system capacity of 16 W (2x8 W) is provided by two speakers. NICAM stereo signal processing system and Sound Surround surround sound function are used.
External interface (connection with other devices) is supported by standard input and output connectors: antenna input (RF), HDMI x2, USB. There is a headphone output. The digital tuner can receive TV channels in the standards DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2.
The TV uses a power supply 715G7734-P01-005-002H.
Dimensions: with stand 727x479x185 mm, without stand 727x425x82 mm.
TV weight: with stand 4.85kg, without stand 4.8kg.
Warning. The panel TPT315B5-FHBN0.K of your PHILIPS 32PHS4132 LED TV is an expensive and unreliable part of it.
Avoid any kind of impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.