The TV works but I think maybe a board or a cap inside is bad. Can you give me some advice as to what may be the issue? I will explain what I have found so far.
TV has power and it stays on standby just fine, the red light turns on when plugged in but no turned ON. Once turned ON, the light turns orange for a few seconds and then it goes to the ON green light.
Sometimes it starts going only to orange but then back to the standby red light. Do you think the power board or power supply is going bad therefore the TV will not turn on properly? Any help is appreciated. We have seen many large flat screen TVs do this. It is usually one or more bad capacitors on the power board.
Gain access to the inside of the TV so you can see all the boards inside. Look at the capacitors on the power board for any signs of buldging. If you see no buldging caps then you may need to just replace the complete power board which are not expensive. This would be time consuming and might not even work. A new power board would make the most sense. TV Power Supply: The power board converts the ac line voltage which is volts AC to lower voltages that are required for the operation of the television, very important is the stand by 5 volts needed by the microprocessor to stay wake so when it receives a command such as power on to turn on the power supply, then the power supply generates the secondary voltages needed which can vary by television, some are 12 to 18 volts needed by the audio circuit and 24 volts supply to the inverter board and numerous other voltages.
Please leave a comment below. Tagged as: capacitorlcd problemslcd tv repairlcd tv will not turnLGpower boardpower supplysamsungTV Repairtv turning on and offtv wont turn onvizio. Sometimes it is 3 slow then 3 fast. Sony Bravia xbrxc has no power no blinking lights. Checked the power cord coming and it checks fine. Standby volts only read 2. Should be 3. Is that too low? Not sure where to go from here. I zenith tv and when I turn it on it will blink and turn to red light and turn off.
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All Listings filter applied. Buy It Now. Brand see all Brand. Main Board 1. Sharp 7. Type see all Type. Main Board 7. Power Supply Board 1. China 1. Not Specified 7. Compatible Brand see all Compatible Brand. For Sharp 5. Not Specified 3. Condition see all Condition. Used 8. Please provide a valid price range. Item Location see all Item Location. Default filter applied.There seems to be a problem serving the request at this time. Sharp TVs have made their way into many homes over the decades.
No matter how well a television is made, it might eventually need a repair. Replacement parts and new main boards are essential to many of those repairs. Every main board has a sticker with a pair of serialized identification numbers. See the manufacturer site for details. For most TV brands and models, there are six different boards that may be in use. The main board also called a motherboardis the main electronic component and one of the largest boards in a TV.
It converts analog video signals into digital ones that can be sent via low-voltage differential signals to the T-con or timing control board.
The power supply board converts the AC line voltage to lower voltages needed to operate your TV. The backlight inverter board works much like a battery for the LCD monitor.
There are also x-sustain, y-sustain boards, and buffer boards for plasma TVs. Identifying problems with a TV can be tricky. The most reliable answer is to get a professional to diagnose the issue. If that isn't possible or you want a second opinion, there are a few symptoms that likely point to main-board issues. If you can see that the television is receiving power but is having problems with the picture or sounds, the issue is usually with the motherboard.
Some T-con board issues can be similar to those involving the main board.
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Because it is the central control unit for the whole TV, the main board can impact virtually any aspect of the set's functionality.
Sharp contracts manufacturers for their main boards, so in a manner of speaking, all boards are third-party. Because of that, you do not need a particular brand or stamp on the motherboard. You only need to be able to verify that the board is compatible with your specific Sharp television model. Skip to main content. Filter 2. Hot This Week. Main Board x All Auction Buy It Now. Sort: Best Match. Best Match. Gallery View. See similar items. Only 1 left!There are three types of Mainboard in the market.
Second one would be the combination of standard components and SMD components and the third Mainboard is purely using all SMD components currently manufacturers producing this type of Mainboard. Some repair tech call this mainboard as motherboard while to some they called it as cards. Once in a while I have customers came to me and showed me the mainboard that was used in their industry such as printing, PABX system and etc and asked for a solution. They wanted to know whether these types of Mainboards can be repaired or not.
There are some facts that an electronic repairer needs to know before he or she can proceed with the troubleshooting and repairing job. Fact Number One. If you want to successfully repair any Main Board, you must get the whole system with it. That means, you need the power supply board and whatever boards that are connected to the mainboard.
If the customer just send to you the mainboard, it will be hard for you to repair because you do not know the correct voltage that needs to be applied to the mainboard and without the right voltage there will be no signal waveform for you to check. Of course you can connect an external source to power up the main board, but you have to understand that certain Mainboard would not run properly if it did not connect to a load.
Missing either one of the boards may produce different result. Tell your customer the truth that without the complete system, it will be difficult to repair the main board. Fact Number Two. Nowadays many mainboard ICs are using programs to run.
These ICs have programs in it in order for it to function well. If the programs have corrupted the whole function of the mainboard will go haywire. It will produce weird symptom and very hard to troubleshoot and repair if you do not have the exact program data and the programmer. Fact Number Three. Schematic diagrams, service manuals and other related information to the mainboard is usually hard to find from the market. If you can locate the schematic diagram, that means it can cut short your repairing time because you will know what sort of voltages and waveforms to be present in the testing points of the components.
Fact Number Four. Without the proper tools even though you have confirmed that the BGA IC is the cause, there is no way to remove it. Fact Number Five. Many testing equipment companies like the Huntron, Sencore, Polar, ABI and etc have developed specialized test equipment just to tackle problems in the mainboard. Well, of course you can do the repair job without them, but do you know that if you have such good test equipment in your work bench, it will definitely speed up your repairing time.
By comparing a good and a bad board in term of voltages, waveform or even signature analysis, you can easily identify the problem. It will take years to recover back your investment. I have a repair friend who told me that he had a Polar test equipment and a high end Digital Oscilloscope. He used it to repair the mainboard from the Aeroplane control tower. He replaced only a cap and charged USD With only few of this repair jobs, he already gained back his investment on the high end test equipment.
Facts Number Six. Even though you have the BGA rework station and you have successfully removed the IC, you still need a replacement part. Without the right parts, there is no meaning in removing the IC in the first place.
If you have good sourcing of parts for the mainboard that you are repairing, this will guarantee the job can be done. It is better still, if you could locate the exact mainboard that have a reasonable price. Instead of repairing you just sell the whole board to your customer and buy back the spoilt board and salvage the parts for future use.Power Board.
Common faults - No power, low power, power blink and intermittent no power. Timing Controller Board T-con board. A Typical T-con Circuit Board. Common faults - White Display, No display, Double image, Display distortion black and white vertical bars on the screen. Inverter board. Common faults - Display shutdown after few seconds, Dim display. The simplest way to identify the Main Board is to look for the circuit board with the audio and video inputs and outputs.
The function is to take in the video and audio signals and convert the analog video signals into digital signals that can be sent by the LVDS IC low voltage differential signaling to the T-con board. Common faults - No display, no color, screen full of vertical lines after sometimes, no sound, horizontal lines and block, sometimes the LCD TV fault usually display problem can be due to software problem where you need to update the software.
Jackpack Section. The audio signal is taken to the audio processor and then audio amplifier which then drive the left and right speakers. LCD Panel. LCD stands for liquid crystal display LCD and it is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals LCs. LCs do not emit light directly thus backlights are needed to make these LCD displays visible.
Backlights Lamps. Common faults -Display shutdown after few seconds and display flickering.
You can test the backlight by visiting my blog at :. Recommended Ebooks:. Click here to learn how you can become a Professional in Testing Electronic Components. Click here to learn how you can find burnt resistor value. Click here to learn how to repair Plasma Television By Damon.
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CRT TV repair.Sharp televisions stand at the cutting edge of innovation, with models that play 4K content at resolutions up to p. This provides you with a stunning HD picture, allowing you to enjoy movies and television shows with exciting precision and clarity.
Smart TVs from Sharp connect directly to online streaming services such as Netflix and Hulu Plus, so you can cut the cable cord if so inclined. Choose slimline HD televisions with resolutions of p, p and p that help you save space while taking advantage of the latest technology.
Screen sizes range from under 55 inches all the way up to 90 inches, providing you with a versatile range of options for your home theater space. Regardless of the size you choose, Sears PartsDirect stocks television repair parts that help you fix your model when things go wrong.
Take advantage of the latest technology has to offer with Smart TVs made by Sharp. These models feature smart guides that integrate your cable and streaming channels into one consolidated location so you never miss your favorite shows. Full mobile controls allow you to set your TV to flip over to frequently watched shows and use your smartphone as a remote control, making these TVs extremely convenient to use.
Make the most of cutting-edge media with Sharp's line of 3-D televisions. These models provide maximum enjoyment of modern entertainment offerings with room to grow as that media becomes more advanced. Your Sharp television provides you and your family with hours of entertainment each week, so keep it in good repair with the help of Sears PartsDirect. Sharp television repair and replacement parts Sharp televisions stand at the cutting edge of innovation, with models that play 4K content at resolutions up to p.
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