We describe how to repair Samsung monitors with their own hands with a malfunction, which is that the device does not turn on, the indicator on the front panel is inactive. Consider several damage options.
Monitor disassembly
Turning on the monitor on the network, we see that its backlight does not light up, the display periodically tries to give a picture, blinks and does not turn on. In addition, the power lamp flickers. This suggests that somewhere in the device there is a short circuit, and it goes into defense. Presumably the case is in capacitors located in the Samsung monitor circuit.
We disassemble the monitor. We unscrew the screws with a flat screwdriver. Try to do it carefully with a metal spatula. You do not need to press hard so that there are no traces on the plastic.
After the front frame is snapped off, we turn the monitor with the matrix down, remove the back cover and turn off the front frame. We remove the wires, snap off and unscrew the metal frame, which holds the matrix on four screws.
Next, turn off the backlight by removing them from the sockets. We remove the board by unscrewing the screws. Did you find a bloating of two electrolytic capacitors? It must be remembered that one or more capacitors may swell in the monitor. Even if this part did not explode and leak, but only slightly increased in size, it is damaged and must be replaced.
The main reason for this defect is the age of the capacitors (the hourly operating time may end). In addition, a defect is possible and the capacitor is dry. Sometimes this part fails due to power surges. Swollen, leaked, or exploded capacitors must be removed, new ones installed, and checked. So, now you know the cause of the breakdown.
Swelling, leakage, explosion of capacitors
We continue to find out how to repair Samsung monitors with their own hands. So, turn on the soldering iron. Pre-lubricate the contacts with flux in order to better solder. While the soldering iron is warming up, we unscrew and remove the power supply board from the case. Before that, disconnect the cable that goes to the control board. We find the legs of the board on the back side. When replacing capacitors, it is recommended to change everything at once. We solder them. Capacitors are changed to exactly the same at face value. Here it is allowed to use a rating with an overestimated operating voltage, and with an underestimated one, it is prohibited.
It is possible to use a slightly larger capacitance of capacitors, but within reasonable limits. For example, instead of elements with a capacitance of 470 ฮผF, you can install parts with a capacity of 680 ฮผF. And another thing: it is desirable that the new capacitor fit in the right place in size, and the width between the legs coincides. We insert new capacitors, not forgetting to observe the polarity, and solder them.
We carefully and accurately proceed to the assembly. We insert the board back into the case. We connect all cables and connectors. We connect the cables and fasten the screws. We assemble before putting on the frame. Then proceed to the test intermediate launch. We connect the device to the network for verification. After replacing clearly defective capacitors, in 90% of cases the defect disappears and the monitor starts working.
Defective power capacitor
Consider another version of a display defect that does not turn on, and its power indicator is inactive. And in this case, we will try to repair the Samsung monitor with our own hands. Disassembly of the device can be seen above. We proceed immediately to the inspection and identification of defects. So, after examining the power supply, you have identified a defective power capacitor. In the area of โโthe left contact of the capacitor, electrolyte smudges are visible. In this case, the part has lost its tightness and requires replacement.
Often, when this capacitor fails, the power transistor burns, which powers the power supply transformer, as well as the mains fuse. First we check the condition of the fuse, call. Fuse int. There is no short circuit on the capacitor contacts. There is no short circuit on the transistor either. We will manage to replace the power capacitor. Breakdown fixed.
Inverter Power
Let us examine the following flaw, in which the Samsung monitor does not turn on. In this case, a breakdown will be detected in the power supply unit of the inverter or its fuses. We continue to carry out repairs with our own hands.
Many people know that the power to the inverter passes through a fuse, which is located next to the capacitors. It looks like a resistor in a green case. Often with faulty capacitors, the inverter fuse also fails. We check the serviceability of the fuse with a multimeter in the continuity mode of the circuit. When the fuse rings, the multimeter should signal a short circuit (if the part is serviceable). Our fuse is damaged.
Has your multimeter shown an open circuit? It should be noted that the fuse could be blown due to a malfunction of the inverter itself. If so, then it will burn again. Therefore, you need to calculate the cause of the inverter malfunction. In this case, you need to check for a short circuit in the power supply of the inverter to prevent re-burning of the fuse. So, install a new fuse. The monitor is working.
Backlight inverter
In this section, we consider do-it-yourself repair of the inverter malfunction, which was mentioned in the previous section. Having determined that the fuse is open, we begin the search for an inverter defect. It is necessary to check the power transistors of two shoulders for each pair of lamps. An explicit defective capacitor was found at the inverter output. It is darkened, stratified and cracked. There is a possibility that the inverter transistors are working, and the fuse has failed due to overload in the secondary circuit of the inverter.
We still check the transistors. There should not be a short circuit between the terminals. All transistors are normal. Replace the faulty capacitor and fuse. We install the board in place, connect the wires, and turn on the monitor. The image is.
Assembly
It is not recommended to completely assemble the monitor immediately. Itโs better to leave it disassembled for a couple of hours. After assembly, we test for 2-3 hours. On this repair is completed.
The article discusses only some episodes of repairing Samsung monitors with their own hands. And what do the experts say about this technique? Many masters believe that Samsung monitors are susceptible to the above damage. Feedback from repairmen about this equipment is still positive.