DIY Samsung 943n monitor repair

In detail: do-it-yourself repair of a Samsung 943n monitor from a real master for the site my.housecope.com.

I knew that he was not a worker who wanted to fix it. Before when I bought non-workers I repaired without problems. and here is such garbage.

There is a difference between inverters, the old one shows from 1.2 to 1.5 and the new one shows on both coils 933

Sacha29 I checked everything ok. just wanted to know is there a difference between inverter transformer TMS92515CT B07TM50A and TMS91365CT J12TM22A?

there was this TMS91365CT J12TM22A, and I put this one TMS92515CT B07TM50A.

I am not the first monitor to do. with this monitor, the difficulty came out

Is your TV, radio, mobile phone or kettle broken? And you want to create a new topic about this in this forum?

First of all, think about this: imagine that your father / son / brother has an appendicitis pain and you know from the symptoms that it is just appendicitis, but there is no experience of cutting it out, as well as the tool. And you turn on your computer, access the Internet on a medical site with the question: "Help to cut out appendicitis." Do you understand the absurdity of the whole situation? Even if they answer you, it is worth considering factors such as the patient's diabetes, allergies to anesthesia and other medical nuances. I think no one does this in real life and will risk trusting the life of their loved ones with advice from the Internet.

The same is in the repair of radio equipment, although of course these are all the material benefits of modern civilization and in case of unsuccessful repairs, you can always buy a new LCD TV, cell phone, iPAD or computer. And for the repair of such equipment, at least it is necessary to have the appropriate measuring (oscilloscope, multimeter, generator, etc.) and soldering equipment (hairdryer, SMD-hot tweezers, etc.), a schematic diagram, not to mention the necessary knowledge and repair experience.

Video (click to play).

Let's consider the situation if you are a beginner / advanced radio amateur who solders all sorts of electronic gizmos and has some of the necessary tools. You create an appropriate thread on the repair forum with a short description of “patient symptoms”, ie. for example “Samsung LE40R81B TV does not turn on”. So what? Yes, there can be a lot of reasons for not switching on - from malfunctions in the power system, problems with the processor or flashing firmware in the EEPROM memory.
More advanced users can find the blackened element on the board and attach a photo to the post. However, keep in mind that you replace this radio element with the same one - it is not a fact that your equipment will work. As a rule, something caused the combustion of this element and it could “pull” a couple of other elements along with it, not to mention the fact that it is quite difficult for a non-professional to find a burned-out m / s. Plus, in modern equipment, SMD radio elements are almost universally used, soldering which with an ESPN-40 soldering iron or a Chinese 60-Watt soldering iron you risk overheating the board, peeling tracks, etc. The subsequent restoration of which will be very, very problematic.

The purpose of this post is not any PR of repair shops, but I want to convey to you that sometimes self-repair can be more expensive than taking it to a professional workshop. Although, of course, this is your money and what is better or more risky is up to you.

If you nevertheless decide that you are able to independently repair the radio equipment, then when creating a post, be sure to indicate the full name of the device, modification, year of manufacture, country of origin and other detailed information. If there is a diagram, then attach it to the post or give a link to the source. Write down how long the symptoms have been manifesting, whether there were surges in the supply voltage network, whether there was a repair before that, what was done, what was checked, voltage measurements, oscillograms, etc. From a photo of a motherboard, as a rule, there is little sense, from a photo of a motherboard taken on a mobile phone there is no sense at all. Telepaths live in other forums.
Before creating a post, be sure to use the search on the forum and on the Internet. Read the relevant topics in the subsections, perhaps your problem is typical and has already been discussed. Be sure to read the article Repair strategy

The format of your post should be as follows:

Topics with the title “Help fix the Sony TV” with the content “broken” and a couple of blurred photos of the unscrewed back cover, taken with the 7th iPhone, at night, with a resolution of 8000x6000 pixels are immediately deleted. The more information about the breakdown you put in a post, the more chances you will get a competent answer. Understand that the forum is a system of gratuitous mutual assistance in solving problems and if you are dismissive of writing your post and do not follow the above tips, then the answers to it will be appropriate, if anyone wants to answer at all. Also note that no one should answer instantly or within a day, say, no need to write after 2 hours “That no one can help”, etc. In this case, the topic will be deleted immediately.
You should make every effort to find a breakdown on your own before you get stuck and decide to go to the forum. If you outline the whole process of finding a breakdown in your topic, then the chance of getting help from a highly qualified specialist will be very great.

If you decide to take your broken equipment to the nearest workshop, but do not know where, then perhaps our online cartographic service will help you: workshops on the map (on the left, press all buttons except “Workshops”). You can leave and view user reviews for workshops.

For repairmen and workshops: you can add your services to the map. Find your object on the map from the satellite and click on it with the left mouse button. In the field “Object type:” do not forget to change to “Equipment repair”. Adding is absolutely free! All objects are checked and moderated. A discussion of the service is here.

It so happened that once the screen of the Samsung 740N monitor, which has faithfully served me for almost 11 years, suddenly went out almost immediately after turning it on. Other attempts to enable and disable were unsuccessful, because according to the signals from the sound card, the operating system was booted successfully, it became clear that the problem lies in the monitor. Of course, a radio amateur cannot so easily throw out an old electronic device without trying to fix it, well, or raskurochit broken device for parts, then how it goes.

A quick search [1-6] showed that the most common problem with this type of monitors is the failure of electrolytic capacitors in the power supply. In general, even the most novice radio amateur can do such repairs, so you can get by with the purchase of several radio components at the place of purchase of the monitor, which is a couple of orders of magnitude cheaper, the cost of your own time, of course, is not taken into account. But in order to repair something, you first need to get inside the monitor, do it carefully, without marks on the case, perhaps the most difficult part of the repair. First, you need to put the monitor face down, so that the surface of the screen would not be damaged, after that you should unscrew the screws holding the stand.

The back cover of the monitor is held by latches located around the perimeter of the monitor case. To open the latches, insert a strong thin object, such as an unnecessary plastic card or a metal ruler, into the gap between the screen frame and the back cover, and then sequentially and slowly unscrew all the latches holding the cover. Under the back cover, such a spectacle appears before us. In the next photo, the cover that covers the power connectors of the backlight lamps is also removed.

It should be noted that the metal casing visible in the photo above, to which most of the structural elements are attached, is fixed in the desired position with the help of the back cover and is not fixed to anything else. Before further disassembling the monitor, carefully document the wiring of all internal connectors. True, a real chance to confuse the connectors exists only for the power connectors for the backlight lamps.

Just in case, we fix the position of the remaining connectors.

Now, from the actual screen, you can remove the casing with the printed circuit boards fixed in it.

Then we remove the power supply board.

As expected, three failed electrolytic capacitors are visible on the board.

Finally, we disconnect the power supply board and remove the protective film that covers the board from the side of the printed conductors, this film is held on 3 plastic clips.

In addition to the obviously failed capacitors, a number of sources reviewed recommend replacing the capacitor C107 for preventive purposes.

This radio part has been replaced with a 47 μF x 250 V capacitor.

Just as the reviewed sources indicated, the fuse F301 breaks down along with the capacitors. In the photo, this is a green radio component, which is visible next to the swollen electrolytic capacitors.

We remove suspicious and clearly damaged radio components from the board. The main culprits are that the author of these lines was left without a computer on May 9, 2017.

In place of the failed radio components, we install similar capacitors. Instead of a 3 A fuse, a 3.15 A fuse with solder leads is installed.

After assembly, the monitor's performance was fully restored, after three weeks of intensive use, no deviations were noticed in the work. The author of the material is Denev.

Samsung SyncMaster 940n LCD monitor repair. A long video that shows all the stages of the repair - disassembly, troubleshooting, disassembling the LCD matrix and replacing CCFL lamps with light-emitting diodes (LED).
Universal LED backlight for monitor from 15 to 24 inches https://ali.pub/d8sm3

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Laptop Repair
Set of 715 BGA Stencils
Post card for laptops (compal) https://ali.pub/1hfkg9
DDR3 memory tester
Universal programmer RT809f https://ali.pub/1mr2ry
Solder mask 5 colors
Adapters for laptop adapter https://ali.pub/1mr2x0
Copper plates for the chip cooling system https://ali.pub/1mr340
Universal programmer RT809f https://ali.pub/1mr2ry

LEDs for LCD TVs
6 volt LEDs on LG 2 watt size 3535 (large platform - cathode (-)) https://ali.pub/7ixcg
6 volt LEDs on LG 2 watt size 3535 (large platform - anode (+)) https://ali.pub/wt8hg
6 volt LEDs on LG 1W size 7030 https://ali.pub/ldrz8
3 vola LEDs on LG 0.5 W, size 7020 https://ali.pub/qfwyb
LEDs 3 vola on SHARP 0.5 W size 4214 https://ali.pub/1mr16s
3 volt LEDs for LG size 3528 (large platform - anode (+)) https://ali.pub/s0q47
3 volt LEDs on Samsung 1W size 3537 https://ali.pub/nqcai
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LEDs 3 volts on Samsung 0.5 W, size 5630 https://ali.pub/rcilb
If you don't see what you're looking for in the list, search here! https://ali.pub/t3g4v

Equipment and consumables for repair
Multimeter UT-890C https://ali.pub/1mr32n
UV Lamp for Drying Solder Mask
Super Tester of Electronic Components
Thermal Conductive Tape for LED Lighting
Universal programmer RT809f https://ali.pub/1mr2ry

Useful modules
DC-DC buck converters https://ali.pub/1mr2h2
DC-DC boost converter https://ali.pub/1mr2jl
Battery charge board Li-Ion 1A https://ali.pub/1mr2zc
Charging board for multiple Li-Ion batteries https://ali.pub/1mr30w
LED backlight for LCD monitors and TV https://ali.pub/1mr2no

Video Repair of the lcd monitor Samsung SyncMaster 943n. Troubleshooting. Replacing lamps with LED channel HamRadio Tag

There is a monitor (brand and number in the title of the post) with a rather gemoric problem, namely, after working for 15 minutes - 2 hours it turns off and does not respond to the power button. Sinned on the selected area, partially solved the problem, but it is still cut down. What else could be the reason for the monitor curve?

It is not known what led to this work, but the fact remains.

ZY The capacitors are in order, there are no swollen ones (all changed to new ones, it’s clear that it would be)

The only skill I have is to disassemble the indestructible and make it work. Soldering of small elements, there is a soldering iron and a desire to make this tin work.

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We have about 300 Samsung 740n in operation at work, after 3 years of operation (when the warranty expired) they began to die en masse. The problem is the same for all - three 1000mkFx25V capacities swell on the inverter power supply and the 3A fuse in front of the output stage of the inverter blows out. In 10% of cases, one of the power transistors flies out. The inverter circuit is assembled on 2 transformers.

Once I had to repair the Samsung 940N, his inverter was made according to a different scheme. There are no such containers anymore, and there is one trance for all lamps. It was just the cause of the malfunction, as I later found out, too, they often fail. There are no statistics of failures for this model, since the device was not ours and was never repaired.

Videos uploaded by HamRadio Tag
Search HamRadio Tag 4 years ago

We are repairing the Samsung 943N monitor, replacing the capacitors did not help! Links Transformer for Samsung 943N (TMS92515CT) - https://ali.pub/5f7kv Repairman Tools - https://ali.pub/ojvtb Screwdriver Kits - https://ali.pub/igme8 Soldering irons - https: // ali. pub / caybg

Hello everyone! When all sorts of incomprehensible things appear on the screen of a monitor or laptop, it is not always clear what the reason is: a chip, scaler, cable, power supply or the matrix itself. The matrix itself can be separately switched to test mode, and in this video I will show you how to do this using a Samsung monitor as an example. You will also see another channel from the heading “free PR” and if this video gets a lot of likes, then the next video will rip off all the covers and you will see how much I earn on YouTube))

How you can convert a regular monitor into a monitor with LED backlight instead of standard lamps.

This video shows how to carry out a simple repair of the LG 1952 monitor, simply changing the capacitors.

They brought 2 samsung monitors for repair - 940n and 740n. Most often, these devices have problems with the power supply, but, interestingly, there are several modifications of these same units for the forties models. Our guys got one modification for both seventeen and nineteen inch models. Accordingly, we will describe the repair of this modification here.

The first thing to do is to look at the display from different angles (preferably with the D-SUB cable disconnected, which VGA goes to the video card). If it is noticeable that the inscription “cable not connected“Then this is our patient. The backlight does not work for the patient, and everything else is normal.

Of course, in order to fix this beast, it must be disassembled. This is done quite simply - we remove the leg and half the body. I half the body using this blue piece that looks like a pick (photo below). You can buy it in most radio markets and one such thing costs about 15 rubles. It is not suitable for any technique, but for both monics, one such was enough for me.

Read also: Hair dryer brush DIY repair

Andrey Sovetkin Hace 3 años

+ commfortnet Conder lamps trans fuse keys

+ commfortnet They are going to die, not that they’re a bitch, but such moniks have been plowing for 8 or more years, and in different conditions (above this, in general, the hike, the sewage system has leaked), I also have a reserve stock, I bought it after a series of repairs. Sometimes they shorten and get very hot, the body melts, the textolite darkens, sometimes it just breaks through, the resistance grows.

He said - because the resistance of the windings is different, but it should be the same. Well, something tells me that this is a typical malfunction of this model (after the capacitors). I have Monique the same and also a trance change.

And if you are aware of which household appliances will rise in price and how much? And what is the reason for this?

Andrey Ponomarev Hace 3 años

Everyone will rush to buy Chinese electronics, and the West will lose a significant share of the profits.

Valerian Bogatyrev Hace 3 años

+ texremont Yes, the sellers will now sell the old lots and then they will grow everything by half. They themselves talk about it in the markets.

All that is imported to us, you did not replace that the dollar grew and they take it for the bucks

Martin Septim Hace 3 años

The monitor was apparently damp, so the leg rusted a little.

Power Resistance Band Hace 3 años

texremont, guys, would you give any advice? There is a Samsung SyncMaster 940N widescreen monitor flickering. There are horizontal stripes on the screen, especially noticeably with dark backgrounds, I tried everything: I changed the tees, I changed the cables, I connected them to the laptop, I shamanized the same thing over the hertsovka, I changed the capacitors for repairs (so I was told (Sense 0. I began to be indignant about this , I was told that I didn’t see any stripes. Well, yes, it’s hard to notice in the light of fluorescent lamps! It really flickers, it hasn’t hit it for a long time! Or that such stripes should go .. There is motion sickness and headaches.

+ texremont By the way, thanks for pointing out exactly the same monitor. I wrote to you six months ago. Soldered the trance in the same way and everything became fine. Then, after two more konder, it swelled up, also re-soldered. Now four more need to be changed. You can see it dry from old age)

Did you try to set Gertsovka in the settings? If possible, bet as much as possible, 75 for example.

Photos came, soap on the site, site in the description of the video

Andrey Sidorov Hace 3 años

Did I understand correctly: is the secondary resistance of the trance winding several hundred ohms?

Andrey Sidorov Hace 3 años

Thanks for the answer, the only thing I came across was the power supply units (computer), everything is short-circuited there.

+ Andrey Sidorov so high-voltage trans on the secondary there are no turns and on the primary there is no fucking

Andrey Sidorov Hace 3 años

Therefore, he clarified, it was too great, as for a trance.

Martin Septim Hace 3 años

Alexey Vprayatorny Hace 3 años

Yeisk Novosti Hace 3 años

And what kind of yellow tape is that? give a link or a title.

Alexander Ruzhansky Hace 3 años

+ Pavel E. - keep

+ texremont will you share a link to this tape? on Ali for sure there is.

+ texremont also tried a braid from pk-75, not an option to solder it. Our braid in Irkutsk costs 15 rubles per meter in the same coil as in the video!

+ Martin Septim thanks. Got it.

+ Martin Septim I tried it thick and the price of pk75 is more expensive

Home Bookkeeping, Personal Budget and Finance goo.gl/ZsAuOH

+ MrSawyerpw Did you look at the power supply? looks like a malfunction of the power supply or processor power system

Today I will tell you how to repair an inverter with your own hands.

If your monitor has a defect that it turns off after two to three seconds after being turned on, and at the same time the image appears at the time of turning on.

A trance defect can be determined by a device for short-circuited loops, by resistance.

Usually one of the trances breaks. This is, in principle, a disease of monitors.

The simplest option, in the absence of a trance, is to install a new inverter, of which there are many on sale.

A detailed examination revealed a defect in one of the inverter trances. It is easy to check this: you need to try the working candle one by one, first at the exit of the first trance, then the second, and so on alternately. In a non-working trance, the candle will naturally not light up at the moment of switching on.

Without going into details, we solder the transformer of the TMS91429CT inverter so that the protection does not work.

After dismantling the trance, it will look like this:

Then we take a ready-made inverter, for the same number of candles (4 candles), which are freely sold on radio markets, radio stores, etc., such as: model SF - 04S402, dimensions: 135-45 mm. Or something similar, the main thing is to fit the inverter in size.

Next, we supply it with power and control, place it with Velcro in a convenient place. It may be necessary to increase the length of the wires from the lamps to the output of the inverter.

Here are some examples of inverter placement.

And here are examples of ready-made inverters.

It will not be difficult for a person to disassemble.

Samsung 940n monitor disassemblyHere is a step-by-step instruction on how to disassemble a samsung 940n monitor, a fairly popular model of LCD monitors, especially in the corporate segment. These monitors come to our service center with a "chronic" problem of this series - swollen capacitors (the power indicator blinks, but the signal is not displayed). Considering the ease of disassembly and the availability of the necessary spare parts, you can repair the Samsung 940n monitor without involving specialists from the service center. By the way, other monitors of this series (540n, 740n) are disassembled in the same way.Attention. This instruction is not the ultimate truth. The author of the article does not bear absolutely any responsibility for the integrity of your technique. Start repairing only if you are confident in your abilities and have the appropriate education! And remember that you can always contact Triaservice specialists. We carry out high-quality repair of monitors samsung, lg, philips, asus, dell in Kharkov and the Kharkov region.

Samsung 940n monitor disassembly steps:

Unplug the monitor and place it face down.

Using a Phillips screwdriver, detach the leg, which is secured with three screws (you do not need to touch the rubber plugs). Attention.
It is necessary to detach the back panel very carefully, as the fasteners can crack (which, in principle, is not so scary). To open the 940n's lid, we need a scalpel or any other thin, sharp object.

Using a scalpel, we gradually open the lid, detaching the latches. Plastic may crack.

After removing the cover, go to the chrome plug. It is enough just to move it.

Then it is necessary to disconnect all interfering cables (including the cable, on the sides of which there are clips) 7.After that, the lid is easily tipped over.

Access to the inverter board is blocked by a plate, which is fastened with three screws. We delete them.

We carefully inspect the capacitors for swelling. It is also worth checking the fuse.

Using soldering accessories, we replace them (2 * 1000mF 25V, 2 * 1000mF 16V, 1 * 470mF 25V, 1 * 47mF 50V).

We assemble the monitor in the reverse order, following this instruction. Pay particular attention to the train, as it can jam and interfere with closure.

We get a ready-to-use monitor.

If your samsung 940n does not work, it most likely needs to be sent to a service center or to the trash heap. Triaservice repairs lcd monitors samsung, lg, philips, asus and dell in Kharkov. We solve problems of any complexity, including replacing matrices. By contacting us you will save money, time and nerve cells. To contact the manager, go to the contacts section.If you liked the article, please like it.