Samsung oven DIY repair

In detail: do-it-yourself samsung oven repair from a real master for the site my.housecope.com.

Control systems based on microprocessor technology are currently used in all categories of large household appliances. Ovens are no exception in this matter. In this article, the author examines the “Samsung BF641FST” oven control system. A description of the elements of the control board, error codes and methods of their elimination are given.

Design features and description of the electrical circuit

The electric oven “Samsung BF641FST” has an electronic control with control over the functions performed. The only exceptions are the function selector and safety thermostats, which are electromechanical devices. The cooking time and temperature are set using an encoder and a variable resistor, respectively. The oven cabinet itself has an almost standard design.

The heating system includes four heating elements: a convection heater (heating element with a power of 1700 W), a double grill (1600 and 700 W) and a lower heater (600 W). The heaters are switched using a function selector and an electromagnetic relay located on the control board. For additional cooling of external surfaces, the electric oven has a special fan located on the top cover of the cabinet. The oven wiring diagram is shown in Fig. one.

Rice. 1. Wiring diagram of the Samsung BF641FST oven, where a) function selector, control board; b) external components of the control board - heating elements, fan, etc.

The schematic diagram of the control board is shown in Fig. 2.

Video (click to play).

Rice. 2. Schematic diagram of the control board of the "Samsung BF641FST" oven

Several functional units can be distinguished on the control board (see Fig. 3).

Rice. 3. External view of the oven control board

Node 1 on the control board is the power supply (PS). It is made according to the AC / DC converter circuit based on the LNK304P controller of the LinkSwitch-TN family manufactured by POWER Integrations (IC101 in Fig. 2). The use of this microcircuit made it possible to exclude a pulse transformer from the IP design (a choke was used instead). The source generates voltages of 12 and 5 V. A voltage of 5 V is generated from 12 V using an integrated stabilizer 78L05 IC102 (Fig. 2). The LNK304P microcircuit is used as part of the power supply unit in a standard connection. Its block diagram is shown in Fig. 4. Due to the simplicity of the IP scheme, its description is not given in this article.

Rice. 4. Block diagram of the LNK304 microcircuit

It should be noted that in the new version of the control board (Version 01), a standby circuit with optocoupler isolation is introduced into the power supply (the elements of this circuit are not shown in the figures). This circuit is controlled from a pin. 6 microcontroller (MK) IC103 through an additional key on the TR107 transistor. The phototransistor of the PC101 optocoupler is connected to the pin. 3 (collector) and 4 (emitter) of the IP controller IC101.

Node 2 in Fig. 3 - board power connector and grill sensor connection contact, node 3 - key display control transistors, node 4 - temperature sensor connector and node 5 - elements of the initial reset circuit (RESET) of the MC.

To simplify the diagnosis of the executive elements of the oven, the table shows their electrical resistance.

Table. Electrical resistance of the executive elements of the Samsung BF641FST oven

Convection Fan Motor

Cooling fan motor

Let us dwell in more detail on the schematic diagram of the control board of the “Samsung BF641FST” oven. The following main nodes can be distinguished in it (see Fig. 2):

one.MK (IC103) type TMP89FH42UG of the TLCS870 / C1 family manufactured by TOSHIBA. It is made on the basis of an 8-bit core and has a ROM with a volume of 16384 bits (Flash memory) and 2048 bits of RAM. In addition, it contains 40 lines of universal ports (input / output), several timers, ADC, serial interfaces, etc. The microcircuit is made in the LQF44P package.

2. Power supply unit based on IC101 microcircuit of LNK304P type.

3. The circuit for the formation of the initial reset signal MK, made on the IC104 (7033P) microcircuit.

4. LED indicator DSP101.

5. Encoder ECD401 TIME SELECT (sets cooking time) and potentiometer VR401 TEMP SELECT (temperature regulator).

6. Power control circuits (POWER SENS), temperature sensor (GRILL SENS, TEMP CONTROL), RY201 relay control, etc.

In the new version of the control board (Version 01), in addition to the power supply, the relay control circuit has been changed (this diagram is not shown) RELAY CONTROL - several transistor switches and two additional relays have been added in the convection and cooling fan control circuits.

System error messages

In the event of various malfunctions of the oven, the electronic system fixes these defects and generates the corresponding error codes. We will list these errors, as well as consider the reasons for their occurrence and how to eliminate such malfunctions.

This error can appear due to a break in the temperature sensor or connecting wires, poor contact in the sensor connector on the board, as well as due to a failure / malfunction of the MC. In this case, the named elements should be checked sequentially. If the defective element has not been identified, the control board must be replaced.

This error may appear due to a short circuit of the temperature sensor or its connecting wires, a short circuit in the sensor connector on the board, or an MC failure / malfunction. In this case, you should consistently check the named elements. If the defective element has not been identified, the control board must be replaced. This error may appear if the ambient temperature is -5 ° C or lower.

The operating time of the oven at a certain temperature inside the cabinet is limited by software. This function has a protective nature to prevent overheating or fire. So, for example, this error will appear if the oven has been operating at a temperature of 100 ° C for more than 16 hours.

At 225 ° C, the error will appear after 4 hours of continuous operation. In some cases, the manufacturer does not exclude the appearance of this error with software failures in the operation of the MC. Usually the error is eliminated by disconnecting the oven from the power supply. If the temperature-time parameters are normal and the reset does not have the desired effect, then the control board should be replaced.

This error is indicated if within a certain time the temperature in the oven has not reached the set value. The reason for this error may be associated with an open circuit in the heating element circuit, a defect in the electromagnetic relay circuit, a poor contact in the temperature sensor circuit, or a software failure of the MC. If the defective element has not been identified, the control board needs to be replaced.

This error occurs when the temperature in the oven exceeds 320 ° C due to a temperature sensor failure or an MC software error, that is, uncontrolled heating occurs. In this case, it is necessary to check the temperature control sensor circuits or replace the control board.

Checking the functionality of the control board elements

As practice shows, the most common malfunctions are defects in thermostats and control boards. A faulty thermostat is diagnosed using a conventional multimeter. Defects associated with the control board are usually reduced to a malfunction of the power supply or possible malfunctions in the operation of the MC.To check the efficiency of the MT, its output voltages of 5 and 12 V are monitored at points 1 and 2, shown in Fig. 5 or directly on the terminals of the voltage regulator IC102.

Rice. 5. Location of test points for checking the supply voltages of the MT

If the MT output voltages are normal, it is necessary to carefully inspect the quality of the soldered connections of the MK terminals, check the performance of the XTL101 quartz resonator using an oscilloscope. Cases were recorded when the cause of failures in the operation of the MC was the IC104 initial reset signal generation microcircuit. In cases where no malfunction has been identified, the control board should be replaced.

We remind you that the power and control circuits on the control board are not galvanically isolated from the mains. Therefore, when carrying out repair and maintenance work on the oven, the necessary precautions must be taken.

Alexander / 10/12/2018 - 10:48
At a temperature above 150, it shows (-). The potentiometer that sets the temperature is out of order. Maybe you can tell what type of this potentiometer and where to buy it? His nominal value is 10 kOhm. I can’t find this anywhere. I do not live on territory of Russia
victor / 09/29/2018 - 16:35
Good afternoon. Help advice blinking indication 8888 does not react to anything.
Natalia / 09/27/2018 - 08:14
The display shows test, what does this mean and what to do? Thank you.
alexander / 09/18/2018 - 12:53
I have error e-083 what to do
Vasily / 07.21.2018 - 14:37
Hello. The oven does not turn on at all, the display does not turn on, does not heat up, etc. What to do. Thank you.
andrey / 05/07/2018 - 17:46
Hello. I have a problem with the lower heating element not working. I changed the places of the temperature sensors of the upper and lower heating element, nothing has changed. Samsung BF 3N3T013 oven. Can someone tell me what the problem is?
Yuri / 04/27/2018 - 10:02
Hello. 1 jumper has ceased to light on the display. Can this be fixed, if so, how? Or a replacement board?
Gulvira / 15.01.2018 - 18:17
Found by "typing" method. If L is on, you just need to press the time regulator and hold it for 30 sec.
Gulvira / 15.01.2018 - 18:07
Also on the oven L, my son pressed something. What does this mean and how to fix it?
Natalia / 01/05/2018 - 17:34
Why does each part of the oven work separately, but together I cannot turn them on?
Irina / 12/29/2017 - 15:00
What if L is on?
Anna / 12/26/2017 - 16:29
What is e23?
Edward / 12/25/2017 - 18:23
Hello. oven LOFRA, TOUCH PANEL WITH TWO DISPLAYS RED AND BLUE, IN THE MIDDLE OF THE CLOCK AND SENSOR OF ACTIVATION. 4 YEARS. THE SENSOR HAS STOPPED TO ACTIVATE, THE DISPLAYS AND THE CLOCK ARE LIGHTING AND DOES NOT TURN INTO OPERATION. BOARD NUMBER: PASS 271020496,12540530, DATE 20130219 HELP TO SOLVE THE PROBLEM. THANKS.
Vladimir / 12/20/2017 - 17:38
Good afternoon. Help advice blinking indication 8888 does not react to anything.
alexander / 09.11.2017 - 21:24
When choosing a temperature above 150 gr. produces dashes (-). Please tell me what it can be?
Alexey / 02.11.2017 - 22:19
I got a samsung oven. When choosing a temperature above 150 gr. issued dashes (-). The culprit is the variable temperature selection resistor. I found this out only by completely disassembling it.
Leonid / 10/01/2017 - 12:46
when the temperature is set above 150 degrees in all modes, including preheating, it burns - - - what burned out how to solve the problem
Marina / 08/29/2017 - 22:40
When I try to set the temperature and turn on any mode, it draws - what should I do?
Alexander / 07/20/2017 - 18:26
Hello. On the oven, there is an e-23, tell me, or describe this error.
NikolayM / 07/01/2017 - 14:15
how to check the temperature sensor

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You can leave your comment, opinion or question on the above material:

Modern ovens break down quite rarely, but problems in their work are not excluded. The difficulty is that the structure and all its elements do not provide for outside interference. Repairing ovens at home is usually done by replacing components and is carried out in most cases by an experienced craftsman. However, in some cases, breakdowns can be repaired by yourself.

If you decide to try to repair the oven with your own hands, then it is worth knowing the situations when this should not be done.There is definitely no need to open the case if:

the electric oven is under warranty;
the oven information panel shows that the problem is a complex component breakage;
you know nothing about electrical engineering.

During the warranty period, all repairs are made is free... Except in the following cases:

There are traces of attempts to open the structure - worn out or damaged heads of bolts, self-tapping screws, removed seals.
Insects or rodents have entered the oven, causing a short circuit or mechanical damage to components and wires.
The connection was made incorrectly, without following the manufacturer's recommendations.
Damage to electronic components occurred due to a change in voltage parameters, as a result of which it went beyond the critical limits specified by the manufacturer.

In all cases where the warranty is canceled, repairs will have to be paid in full... The same situation occurs when the warranty period expires.

Before grabbing a multimeter, putting on gloves, and pulling out a set of screwdrivers, it makes sense to check the power supply to the oven. It is worth looking for answers to the following questions:

Is food served?
Is the power cable OK?
Is there good contact between socket and plug?
Are there traces of carbon deposits, melting on the plug and socket?
Is the fuse for the plug or oven broken?
Is the power wire in perfect condition, is there any fractures, scuffs or melting on it?

Checking the fuse in the plug

If the above problems do not exist, and the oven still does not start, it is worth checking the device for standard faults.

Consider typical malfunctions, methods for diagnosing them and the necessary repair of electric ovens at home. As mentioned above, most of the troubleshooting work involves replacing assemblies and parts.

If the electronic control unit of the oven suddenly fails, then be prepared to pay a tidy sum for repairs. In most cases, you do not need to do anything to identify this problem. Modern oven models are equipped with self-test system: The electronics will send a signal by itself by displaying an error code.

Do-it-yourself repair of the control module is possible only if you have experience and knowledge in electronic technology.

Parts are replaceable and can be ordered from the manufacturer's catalog. For users who prefer to get a baked chicken out of the oven, rather than electronic boards, it is better to call a qualified technician.

If this is not possible, or the qualifications of the service personnel do not inspire confidence, you can order a control unit wholly... This can be done on the manufacturer's official website or in a specialized online store. It is usually not difficult to install a board in place of a burned-out one.

Most modern models equipped with mechanical regulators do not provide for disassembly and cleaning. Primary repair consists in removing contamination from the outside, removing contact leads and cleaning the terminal plates on the regulator or timer. If this does not help or does not help fully, the part should be replaced.

Some older models allow cleaning of mechanical regulators, after which the latter work perfectly, without any complaints. It is necessary to carry out maintenance using non-aggressive solvents, for example, white spirit or a weak solution of ammonia. It is necessary to clean off oxides from contact groups with a very fine sandpaper; to eliminate traces of corrosion, special primers are used.

Oven mode switch

This is a part that is often changed, including when the gas ovens are being repaired. No interference in the design of the device is provided. The entire element is replaced.

Air blower and grill fans no longer create a good air flow over time.If the engine is running, the impeller should be cleaned. Dust constantly accumulates on it, while grease and oil are on the blowing fans.After a certain period of operation, it is imperative to disassemble the oven and lubricate the engine, if this is provided for by its design.In the event of a blower failure, rewinding or other repairs are simply unprofitable - the entire unit is replaced. Do the same with the grill motor. It is placed in a non-separable housing together with a gearbox.The heating elements of the oven are constantly working in critical mode. Determining whether the heating element is working is quite simple. To do this, turn on the oven to the appropriate heating mode and check the temperature by touching your hand in a kitchen mitten. The method works, however, for a more accurate result, it is better apply a pyrometer... The device will clearly show the uniformity of heating over the area, indicate the maximum temperature in a given mode. This will make it possible to diagnose the "burnt" heating element not only completely, but also partially.Heaters are replaced after disassembling the case; it is not difficult to buy the corresponding part. The specific marking can be found after removing the heating element or according to the reference data of your electric oven model.The last three elements, which change without hesitation or hesitation, are the backlight, thermal fuses and a touchscreen film panel. All of these parts cannot be cleaned or repaired.The oven electronics will inform about the operation of the thermal fuse in emergency mode, and problems in the operation of the film touch panel are diagnosed by the lack of reaction, the need to exert excess pressure, and accidental operations. The backlight lamp can be replaced independently, but to install new thermal fuses or a film sensor, it is better to contact the master.

Checked all the elements in the TEMP SELECT and TEMP CONTROL circuit.
I warmed the temperature sensor with a hair dryer, watched the AD-IN voltage change on the process. Prots fulfills BAND-1 and BAND-2. If you turn off the temperature sensor, it gives an error. Those. I conclude that the chain is in good order.
The temperature twist resistor is normal - 10kOhm. The TEMP_SELECT voltage on the process changes from 0 to 5V, if you turn it from 0 to 250 degrees.
Just in case, I changed both 1μF capacitors C301 and C401.

While in a stupor, it remains only that the ADC is dead in the process in the TEMP_SELECT circuit.

Maybe someone came across this?

PS: There are many messages on the internet with a similar problem, no one has suggested solutions. In one place, a person said that it was necessary to change the "penny resistor", further discussion did not go. But I checked these circuits, for me all the details are normal.

The same problem happened today, I figured it out - everything is as you described, BUT! When the temperature is 190 everything is working, 0.8 volts are supplied to the legs, but it should be 1.2! That is, when 0.7 turns on the upper shadow mode! If you switch the turn signal to ten, then the upper ten turns on! Therefore - an error in the temperature controller! Since there was no regulator at hand, I temporarily stuck the interlinear in series with the 10k resistor. Everything works - the temperature is displayed clearly. Conclusion - change the variable resistor on the temperature controller. He gave me 8.5 kOhm.

Thanks for the diagram - it helped me a lot to figure out the problem!

MASTERPLIT service center repairs hobs, ovens, microwave ovens SAMSUNG

Repairs are made at home at a convenient time for you. An experienced engineer in the shortest possible time will determine the cause of the failure of your equipment and will do everything possible to solve the problem. We use original spare parts and make repairs of any complexity.

You can call the master from 8:00 to 20:00 by phone

Or leave a request for repair online at any convenient time

One of the most common problems with SAMSUNG ovens is the failure of the mode switch. Over time, the contact group begins to warm up and melts out of the case. In this case, the oven stops heating up or heats up very badly. The problem is solved by replacing the switch.

Sometimes, together with the contact group, they heat up and close the power circuits of the electronic module, as a result of which it also fails. In this case, the oven does not turn on at all. The problem is solved by replacing the switch and the module.

Another reason that the oven does not heat up may be the failure of the safety thermostat. This is due to the stopping of the convection motor and the overheating of the oven.

To solve the problem, complete disassembly of the convection motor, cleaning, lubrication is required.And also the replacement of the safety thermostat.

At home or at a service center
departure of the master on the day of treatment
repair warranty up to 12 months

• Departure and diagnostics of the master (in case of repair)

• Departure and diagnostics (in case of refusal to repair)

The specialist arrives at a convenient time for you. Possible urgent call and arrival of the master in 60 minutes

No overpayments and "hidden" payments - in 90% of cases you will find out the cost of repairs by phone

Discounts for seniors and people with disabilities 5% -10%

We have a quality control department. Consultations are available to you on the toll-free line +7 (800) 700-73-70

Departure of a specialist is possible at any address in the city, in districts and dachas and the nearest settlements

During our work, it has already been completed over 150 thousand applications.
Daily we process about 300 requests

Ovens equipped with fans are no longer a novelty in the modern home appliance market. And although at first glance, the oven and fan are directly opposite in purpose, many housewives liked this improvement.

The presence of a cooler in the oven has a positive effect on the cooking process:

ensures uniform heating of the dish;
speeds up the cooking time, which reduces the use of electricity;
cleans the oven from unpleasant odors;
in the presence of the grill function - provides a golden brown crust.

To achieve high efficiency of the cooler, it is supplemented with a convection function - it directs hot air to the cooking dish. The difference between convection and a fan is that the cooler can work without convection, but on the contrary, it cannot. Some oven models have multiple blowing systems.

The movement of air can be used not only for cooking, but also for defrosting food. Another way of using the fan is drying vegetables and fruits, which is possible at a temperature of 80 degrees.

The situation when the oven itself functions, but the blowing does not work, is quite common. The reason for stopping the fan is most often commonplace - it is clogged with particles of grease and dirt. During its operation, the fan passes fine dust particles through the blades, which settle on its parts. Over time, the amount of grease and dust becomes sufficient to prevent the cooler from turning on. Also, each cooler needs to periodically renew the lubricant.

If the blowing system or convection does not turn off with the Samsung manufacturer's oven, you need to call the master, since completely different reasons can lead to such a breakdown, one of which is a sensor breakdown. Another frequent breakdown is engine failure. This can happen due to contamination of the cooler when it is operated for a long period with a heavy load, as well as due to voltage surges if the oven is not connected through a power filter, or due to natural wear and tear.

According to the experienced technicians of the service center, the following breakdowns may occur with the fan:

the fan is jammed - the deformation of the blades, the bearing is out of order, the anchor is jammed;
the engine shorted and burned out;
the thermostat has broken;
broken wires leading to the cooler;
the control board is out of order - the corresponding signal is not received.

Before proceeding with the repair of the cooler, the master will determine its type. Popular manufacturers such as Bosch, Samsung, Candy use two types of fans: tangential and convection. The first type is designed to cool the front panel and control knobs of the oven, as well as the surrounding furniture from the internal heat of the cabinet. These coolers are located in the upper part of the case. Convection ones are designed to distribute air inside - all manufacturers install them in the back wall of household appliances.

Whether it is possible to repair this working unit depends on the level of breakdown, the availability of spare parts and the skills of the master.For example, if there is no contact in the wiring, it can be found with the help of a multimeter and repaired. If the engine or its anchor is out of order, in some cases it is easier to buy a new part. Only an experienced craftsman can make an accurate diagnosis and determine the feasibility of repair or replacement. Residents of Vinnitsa will be able to order a call to a specialist at home by filling out an application on the website https://my.housecope.com/wp-content/uploads/ext/3098/.

When planning to buy an oven, you should give preference to models equipped with both types of coolers. Such a technique will be more convenient to use - it is safer to work with it, because there are much fewer opportunities to burn your hands, it is more economical and functional. The best option is an oven with a convection function, which will not only speed up the preparation of the dish, but also make it tasty and aromatic due to the even baking of all layers.

In order for the fan to serve without breakdowns, make sure to listen to simple tips for caring for the oven:

wipe it with a damp cloth after each cooking;
clean the surfaces and blades of the cooler with a special tool at least once a month;
do not use aggressive agents for cleaning;
do not put the baking sheet on the bottom during cooking - this interferes with the correct distribution of hot air.

In the event of a fan breakdown, do not delay contacting the master - he will not only figure out the reasons, but also repair or replace this part at home. If the inoperative fan is only a consequence of another, more serious malfunction, you should not experiment with the repair yourself - it is better to entrust your home assistant to an experienced master of the service center.

At home or at a service center
departure of the master on the day of treatment
repair warranty up to 12 months

• Departure and diagnostics of the master (in case of repair)

• Departure and diagnostics (in case of refusal to repair)

The specialist arrives at a convenient time for you. Possible urgent call and arrival of the master in 60 minutes

No overpayments and "hidden" payments - in 90% of cases you will find out the cost of repairs by phone

Discounts for seniors and people with disabilities 5% -10%

We have a quality control department. Consultations are available to you on the toll-free line +7 (800) 700-73-70

Departure of a specialist is possible at any address in the city, in districts and dachas and the nearest settlements

During our work, it has already been completed over 150 thousand applications.
Daily we process about 300 requests

Our site will help you quickly find an experienced craftsman to order any home appliance repair services. Submit your request and trusted specialists will offer you their services and prices.

Order Samsung oven repair services on the Yuda website. Experienced specialists will repair your oven inexpensively.

It is urgent to order repair services if you notice the following problems with the oven:

does not turn on
does not heat up to the set temperature
overheats
does not heat the bottom of the oven
makes a lot of noise
spontaneously turns off

The Yudu online service technicians have professional tools for repairing Samsung ovens and all the necessary parts. They will carry out repairs at home in any area of the city.

The cost of repairing the oven is determined depending on some of the nuances:

Samsung oven model
type of malfunction
complexity of work
urgency of the order

Prices for all services are discussed in advance. When replacing parts, their price is also included in the total cost of work.

The time required to repair the Samsung brand oven is determined by the master Yuda after carrying out diagnostic work. Minor repairs will take no more than one hour, and major repairs will take up to three hours.

Each Yudu master guarantees the high quality of the work performed. His place in the overall rating and, as a result, the size of his salary depends on customer reviews.

Video (click to play).

To have your Samsung oven repaired, call Yuda at your home.To do this, create a request on the site, and then select a master from those who responded. You can make an urgent order and the master will come to you very soon.

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