ЖК-телевизор Samsung UE40ES6727 | |||||
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Характеристики и обзор |
| Характеристики, цена, отзывы UE-32D6100 - UE-37D6100 - UE-40D6100 - UE-55D6100 - UE-40D6510 - UE-46D6510 - UE-32D6530 - UE-40D6530 - UE-46D6530 - UE-55D6530 - |
| Sorry, this video was made at home and due to family and pets, had to be heavily edited!
Repairing Samsung TV It's common issue with Samsung TV's to have lower voltage capacitors than what's required in their power supply / transformer printed circuit boards (PCB), which will eventually fail. It's best to change the capacitors before they become faulty as they can sometimes surge destroying other PCB components, which could make your TV a write off! There's three levels of repair: 1. Replace the faulty capacitors (easy) 2. Reset the EEPROM (slightly tricky) 3. Fault finding the circuit boards (only for the experienced) How to replace the capacitors: - If your TV has stopped working, disconnect it from the mains and leave it to stand for 24hrs, this will discharge high voltage capacitors. - Lay the screen flat on the front, making sure the screen will not be damaged and unscrew the back cover. - To locate the power supply PCB, look for the 240v mains socket and follow the cable, this will connect to the board. At this point do not touch the large capacitor (it will have a rating of approximately 450volts), test with a multimeter first to see what charge it currently has. - Visually inspect the transformer to see if there's any burns or bulged / leaking capacitors, in most cases there will be. The capacitors that normally need replacing are 10v, 1000 micro farads and 105oc. Replace these with 25v, 1000micro farads and 105oc. These will last much longer (all capacitors have a life span -- the newer design capacitors are solid, which don't leak). - To replace the old capacitors, you will need: non-corrosive water based flux, soldering iron, solder wick and lead-free solder. - Locate the joints of the capacitors that require change and apply flux. Flux cleans the contacts and conducts heat, making de-soldering / soldering much easier -- in fact you can't solder without flux, it's that crucial! - Place the solder wick on the joint and apply the soldering iron on top of the wick and be patient, the first de-soldering process takes the longest as the soldering iron's heat will be consumed by the circuit board. - Once all the capacitors have been de-soldered push the legs so they loosen as they will have a small amount of solder holding them to the holes, they will be a bit stiff, however they will 'click' once they have loosened. From here you can remove the capacitors by hand. Place the new capacitors into the holes making sure negative goes to negative and positive goes to positive as they are polarised! You can look at the circuit board, capacitors for positive/negative symbols. Also the long leg of a capacitors is the positive side. Reconnect the PCB to the TV and try powering your Television! WORKED!? If it has then great! You are one of the lucky ones! If it hasn't then keep reading! Resetting the EEPROM: - Leave the power supply circuit board and remove the digital PCB. Look for a label on a 8pin SOIC (looks like a square spider) that shows "EEPROM". Normally this is located on the opposite side of the board, and near the top right. - You can either bridge pin 5 & 6 together or connect a cable about 5 inches long to pin 5 & 6. In the video the cable is used as it is easier to demonstrate the method and for future repairs if required. - To find the first pin of the EEPROM look for a tiny dot on top of the SOIC, this relates to pin one or look at the markings on the PCB, pin one will have a corner marking. Then counter-clockwise count to pin 5 and 6 (these will be the opposite side and corner to pin one). - Same as with the capacitors, use flux and a fine soldering iron tip and either bridge pin 5 and 6 or solder a cable to each pin. This isn't shown very well in the video as my hand was in the way! Reconnect the circuit board to your TV (including screws) and connect the mains cable, wait for the stand by light to illuminate, count to 2, then unplug the mains cable. This is where the cable comes in... snip the cable or remove the board and de-solder the bridge (making sure the legs are still soldered to the PCB). ** do not press the buttons on the TV, use the remote** Then plug your TV to the mains and use the remote to load the service menu (try this first) press individually (only one at a time) Info, Menu, Mute, Power (in that sequence) -- this will turn your TV on and should work from here... if not, press the power button (on remote) to turn the TV off and press the power button on the remote another time to turn your TV back on. That should be it!!! If that hasn't worked, then I'm afraid if your not experienced in diagnosing electronics then you can't go any further, as there will be other components on the circuit boards that have failed and to fault find the boards is beyond this article. In most cases the previous procedures will work! Good Luck! |
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