In detail: do-it-yourself Philips TV repair from a real master for the site my.housecope.com.
So, given: an old (but not vintage) PHILIPS 20 PF TV. First, the sound disappeared, then the image. You can get to the workshop and there, almost certainly, for some 3-4 thousand rubles, it will be revived. If it were new, in those days when it cost 12-14 thousand, probably such a trip would make sense. Now the technique is different, and the prices are much lower. For 3-5 thousand you can buy a new device. Which, in fact, was done. However, it is somehow unsportsmanlike. And then there is a desire to remove the lid and see everything goodbye and maybe even repair something? To remove the cover, you need to unscrew 4 screws on it, with a branded head. A set purchased for 38 rubles in FixPrice helped me with this (Fig. 1)
In the next photo (Fig. 2), you can see, on the left, the power supply. It was in it that the reason for the failure of the apparatus was found - the capacitors swelled and failed. (circled in red). In Fig. 3, the swelling of the capacitors is clearly visible. In fact, of course, only one completely failed. But it is clear that the rest are already at their limit. So we will change everything.
For further control, an enlarged snapshot of the block was useful (Fig. 3). Since the capacitors are electrolytic, polarity must be observed when replacing them. In our case, the board has polarity markings.
When replacing capacitors, it is better to choose capacitors with the same capacity, but with a higher allowable voltage. Instead of 25V, I found 35V. The dimensions allow such a replacement, and the reliability will be higher! So, the complete replacement of the capacitors cost 200 rubles.
What kind of repair experience do you have? Write us. Society needs your experience.
I would like to express my gratitude to Vadik for the high-quality soldering and support.
Repairing a TV is not always associated with a long troubleshooting study of the circuits and flashing the controller. Sometimes it is enough to open the device and carefully examine the appearance of the parts.
The high reliability of electronic components sets the manufacturers the task of how to limit the service life of the manufactured equipment, so that after 7-12 years the device will calmly retire after a breakdown as outdated. The question is solved simply, for example, electrolytic capacitors sharply reduce their service life with prolonged heating. It is enough to place the condenser close to or next to the cooling radiator and the problem is solved. So, in principle, there was a question of lifespan in this Philips LCD TV. TV assembled on the LC4.1E chassis.
The TV got out as faulty and had to go for parts. When turned on, the TV often blinked green LED. The malfunction, in principle, indicated a problem with the power supply. So how to make repairs.
1. Place the TV on a flat surface. We unscrew the four mounting screws from the back of the TV. The slot of the screws is an asterisk. See photo.
Video (click to play).
2. Unscrew the two screws that secure the TV leg.
3. Lift the back cover. At the top right is the power supply board.
4. We carefully study the appearance of the capacitors. The knurled top covers must be flat. If there is swelling or even opening, then the part should be replaced.
5. We buy, select serviceable electrolytic capacitors. For this repair, capacitors were taken from the CRT monitor board. Capacitors can also be supplied in larger geometrical sizes - a headroom of 10-15 mm. Try to set analogs in terms of capacity, the operating voltage can be used at a higher one.And don't buy the cheapest capacitors, suspiciously labeled capacitors.
6. Unscrew the two screws securing the power supply board. Disconnect the right and top connectors. Parts have been accessed. We solder the capacitors and install new ones.
7. Putting the TV set. DO NOT FORGET to attach the connectors. We turn on the TV to the network. In principle, during the repair it was assumed that it would not work, then not the details: (. But the TV worked. The LED turned green and the screen lit up. Lucky!
TV on the LT41.1E chassis
This is how we were not too lazy to revive and give a second life to the Philips LCD TV! After rummaging through the forums, it turned out to be a typical malfunction for TVs on the LC4.1E chassis.
Is it possible to find out the capacity of an electrolytic capacitor standing alone next to a transformer. Unfortunately, it was flooded with some nasty stuff and all the data deteriorated during soldering, I really would not want to throw away the TV. Sincerely.
in general, the problem with tv. it turns on, sometimes even normally, it works and all that, but sometimes the silence is just cut down, there is no reaction to the remote control for anything. I disassembled it in half with grief, since half of the apparatus is bolted and half is latched.
in appearance everything is whole. if the device turns on, then, judging by the description on the board, there are all voltages on the block and they are actually normal, everything works. but when it stops working, there is only a duty room, as I understand it, +5 V and that's it. neither 24 volts nor 12 volts for you.
will lie down for half an hour an hour - it turns on again and can work for at least half a day, then again 5-6 you can turn it on and turn the wedge off again. what are the output capacitors? he measured it with a donkey when it works, everything seems to be exactly, at 24 V there are hardly noticeable pulsations. but that's not all. he lay in the workshop for two days, they said that they didn’t know they had him, he generally worked smoothly and did not cut himself down.
They gave me a Philips TV for spare parts, not working at all. The owner said that the fuse seemed to have blown, but luckily this was not the case. After all, if the fuse has blown, it means that somewhere in the primary unit it was short, and to repair after a short circuit continuous hemorrhoids.
In short, I turned on the TV to the outlet, when I plugged in from the outlet, sparks flew, so the capacitors were charged, there is hope. Any button presses on the remote control and the TV did not allow it to start. So the TV set stood for about five minutes, tried to start up literally for a fraction of a second, but did not start. Then he turned it off and began to disassemble the case, cleaned everything from dust. An external examination of the board gave no results, all capacitors were not swollen, there were no burnt parts.
So something with the power supply, 90% with filter capacitors is a problem, my instinct did not let me down. There is an open circuit on the power capacitor of the 250V 47mkF line transformer, one of the legs rotted away. After replacing this capacitor, the TV started up without problems. No more problems, although the TV is old, it shows well, I'll put it in the kitchen.
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Televisions, like any other technology, have their own shortcomings and fail over time. Why, to give an exact answer as to why the Philips TV does not turn on or does it by itself is impossible without preliminary diagnostics. As a rule, plasma works flawlessly for a long time, easily broadcasting digital, cable and conventional channels. LCD malfunctions make themselves felt suddenly, but often they turn out to be easily removable with your own hands.
The first thing to look out for is the power cable. It is possible that it was not plugged in enough. Make sure it is in the optimal position and not pinched by heavy objects.
Then inspect the outlet itself or the extension cord where the cable was connected. Pay attention to the tightness of the connection of the contacts. When strongly unclenched, weak contact occurs, due to which the device lacks power to fully function.It can also cause the outlet to heat up and burn the contacts, with a high probability of a short circuit.
Sometimes the LCD TV does not turn on the first time. Many people mistakenly start looking for a problem in the plasma hardware, when in fact, the reason may lie in the control panel. The culprit is dead batteries or a damaged infrared port.
In order to witness the breakdown of the remote control, direct the emitter at the smartphone camera, if the light does not blink, then the batteries are dead or there are other malfunctions.
It is quite possible to start the TV from the control button on the case.
Inspect the receiver itself, often it turns out to be in an inappropriate condition as a result of a fall or mechanical damage, for example, a ball hitting the screen.
If the equipment does not turn on at all, and the LED (light on the case) still blinks, you should study the error codes of Philips TVs. They are included in the user manual attached to the kit, which helps to determine the problem yourself. For example, 3 consecutive blinks indicate a critical state of the power supply unit, etc.
Among other breakdowns, it should be noted:
Problems with the firmware.
Voltage surges.
Power supply malfunctions.
Damaged inverter.
Human factor.
It's worth noting that software breaks down more often than you might think. The problem lies in the unstable power supply or sudden power outages. As a result, the memory module burns out, which leads to the erasure of the operating system.
After the firmware “flies”, a black screen is observed, Philips equipment will not be launched from the remote control, it stops connecting to Wi-Fi or starts to hang on the intro screen saver. In rare cases, there is a "shift" of the image to one side.
By the way, it is not necessary to go to the masters, because it is possible to carry out repairs with your own hands. The only thing you need to have a little experience with the software and be sure that all the "brakes" appeared due to the software.
If, after updating the software, the Philips TV set does not search for channels, turns on and off immediately, then this indicates "symptoms" of a hardware failure. Well, in the event that the TV does not react to commands in any way, it remains to take it to the service center.
Attention! Before flashing, find the exact model name of your TV receiver. An error in just a few letters can lead to a complete violation of the startup algorithms. Downloading software is required only from the official website of the device manufacturer.
Due to power surges, individual power elements of the main board stop working. Often it is they who provoke the loss of the image and the absence of sound, if there is video on the screen. The catch is that the electrical circuit, without stabilizers, quickly becomes unusable.
Initially, this is characterized by minor failures in the operating system. At first, they can be easily eliminated by using a full reset, with the equipment disconnected from the power source. A little later, if the drops and jumps do not stop, the electronics will stop interacting with the control panel, stop seeing the USB flash drive, or even cause the software to crash. Only the master in the service center can cope with the restoration of the TV receiver's performance.
Note! Take care of the safety of your devices by purchasing surge protectors or stabilizers. Such insignificant costs will save expensive Philips equipment from frequent breakdowns.
The Philips TV's AC adapter is the weakest component in the system. It breaks down due to the loss of tightness by the capacitors (the so-called "swelling"). The first signs of a possible breakdown are a whistle or squeak when the device is turned on. Not everyone is alarmed by this, which ultimately leads to a serious disruption in the operation of the device, including its complete replacement.
The power supply malfunction is characterized by the loss of the image, active flickering of the backlight and a reasonable shutdown of the TV. Signs may also vary depending on the model. So, the same whistle makes itself felt if:
Of course, in modern devices something like this is very rare. It is not recommended to look for the source of the noise on your own, because after disassembling the case into its main parts, without proper practice it is easy to hook on other equally important parts of the overall system. The best solution in this situation is to visit a workshop with a complete diagnosis of the device.
It is not uncommon for fluctuations in power supply to damage the CPU. And since it only comes with a board, repairs will cost several times more than buying a PSU alone.
Following the power supply unit, most often the inverter is subject to change. By its structure, it performs a number of useful functions, without which it is impossible to imagine the stable operation of a television receiver.
First, it converts DC voltage to AC voltage.
Secondly, the responsibility for changing the brightness lies on its "shoulders".
Thirdly, the inverter is responsible for protecting against network overload and short circuits.
A clear sign of inverter breakdown are:
Changes in screen brightness, sometimes it turns off by itself or completely goes out.
Backlight glare when the power indicator stays on but does not respond to the remote control in any way.
The TV set does not start after a long period of inactivity.
The backlight behaves strangely, lights up after shutdown or refuses to start at all.
There is sound, but no image.
To finally understand that it was the inverter that failed, only diagnostics will help. Carrying it out on your own is by no means recommended, because without special knowledge and practice, there is a possibility of touching important radio components.
Additionally, make sure that the antenna connected to the TV input is grounded. Otherwise, there is a risk of losing your equipment due to a severe thunderstorm.
The most underestimated option of all the proposed ones. Speaking initially, it is impossible to ignore the fact that almost all people do not use the operating instructions for equipment, including a television set. From here comes a number of misunderstandings about exactly how to use the equipment, where to connect the wires or how to start the on timer so that the device does not start suddenly in the middle of the night.
Simple inexperience and lack of knowledge leads to contacting the SC, with complaints about the lack of a signal from the antenna or problems with the definition of HDMI. Things are much worse when an inept buyer decides to replace burnt parts on his own. Experts have long paid attention to the mandatory availability of technical education or experience to interact with electrical TV circuits. Therefore, do not bet the health of your plasma, but rather seek help from qualified craftsmen.
From all of the above, it is easy to guess that before declaring a complete malfunction of the new-found technology, you need to consult the Philips TV manual for help. Perhaps she will explain why the equipment does not turn on.
If Philips equipment has performed well over the past years, then the reason for the unstable operation should be sought in the hardware component. It is possible that the replacement of the matrix or power supply unit will be required. If you have never updated the software, then you should think about "pumping" the software, because often it turns out to be the culprit of all the troubles.
