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=== Reset Devices === | |
- | It is helpful to reset all the connected source devices like Cable Boxes, Fire Sticks, etc. This might cure the no |
+ | It is helpful to reset all the connected source devices like Cable Boxes, Fire Sticks, etc. This might cure the no-picture problem, and it is pretty simple to do. |
=== Check HDMI (Cables and Inputs) === | |
- | The HDMI Inputs can have problems that will interrupt the video signal, while still allowing audio to function. There are two main points of failure, the input sockets and the cables. |
+ | The HDMI Inputs can have problems that will interrupt the video signal, while still allowing audio to function. There are two main points of failure, the input sockets, and the cables. |
- | * First, unplug and reconnect each HDMI cable at both ends, the TV end and |
+ | * First, unplug and reconnect each HDMI cable at both ends, the TV end, and the other connected device. Do this for every device that is connected to your TV. |
* Use a known good cable and swap it with the cable from a particular source. See if that helps. Do this in turn for each source that you have. If this swap fixes a problem, then get a replacement cable and install it. | |
* Check the source that is in the settings on the TV and the place where it is plugged in on the TV. Since you are already getting sound, it is highly unlikely that there is a mismatch between input and setting, If no issue go to the next item. | |
* If that works see if another device will work in HDMI1. If it doesn't, it could mean your HDMI port is bad or there is a major software glitch and a Factory Reset might be necessary. It might also indicate a problem with a ''particular connected device'' if ''''that'' device'' doesn't work in any port. | |
* Occasionally non-certified HDMI cables will cause problems in this way, it is best to use certified cables. | |
- | * Some newer models will have an HDMI test mode. |
+ | * Some newer models will have an HDMI test mode. You can check the cables for faults using this setting. |
== Software Issues == | |
If your TV is not set to automatically update its software, it may cause erratic operation. Performing a manual update is another step you can take to eliminate a possible cause. | |
- | * Given the occasional instability of WiFi |
+ | * Given the occasional instability of WiFi-based updates, use a hard-wired source or a flash drive in a USB port on the TV. |
=== Factory Reset === | |
- | If the update had no effect, or wouldn't work, the last step is a factory reset. Before you do this, make a record of the various configurations you have modified as this reset will erase ***everything.*** Your TV will have all factory default settings and if this cures the no |
+ | If the update had no effect, or wouldn't work, the last step is a factory reset. Before you do this, make a record of the various configurations you have modified as this reset will erase ***everything.*** Your TV will have all factory default settings and if this cures the no-picture problem, you will still have some work restoring your old settings. Perform the reset according to the instructions that came with your TV. |
- | == |
+ | == Bad Backlights == |
- | You have checked the settings software, connections, and connected devices; now let's check the function of the TV itself. |
+ | You have checked the settings software, connections, and connected devices; now let's check the function of the TV itself. |
- | |
+ | [note]If you haven't seen the [guide|25632|How to Use a Multimeter guide] yet or if you need a [product|IF145-035-7|multimeter], now's a good time to check those out.[/note] |
This quick test will help you determine if the backlights on your TV have failed. | |
* Turn on the TV. | |
* Make sure you are connected to a source that will give you a signal with sound and picture (if your TV was working properly you would have a picture, that is) | |
- | * Shine a bright flashlight |
+ | * Shine a bright flashlight on the screen. |
* In the area lit by the flashlight, see if you can see an image. | |
** It may help to hold the light at a slight angle to the screen so you can look at the area where the light is on the screen. | |
* You are mainly looking for signs of failure on the boards and you will replace the board as a unit. | |
- | * Remember that there are somewhat exposed high |
+ | * Remember that there are somewhat exposed high-voltage areas on the power supply board. Consider the following when taking voltage measurements: |
** Use common sense and where possible use one hand at a time for measurements. | |
** Connect to the ground first, then with one hand check the high voltage connection, or measurement point. | |
** Test leads with insulated clips on your multimeter will help greatly with this. | |
- | If you aren't comfortable doing internal checks, you can have a technician check it out. Attempting repair instead of just throwing it out is a great way to go. |
+ | [note|type=tip]If you aren't comfortable doing internal checks, you can have a technician check it out. Attempting repair instead of just throwing it out is a great way to go.[/note] |
- | |
+ | == Faulty Cable Connection == |
Even before you test the various boards, just disconnecting each cable and reconnecting it can sometimes fix the problem. Especially important in this step are the ribbon cables that run between a small board called the ''T-Con board'' and the ''Main Board''. | |
* After you do this, plug the TV in and see if you now have an image. If so, you're done; if not, go to the next step. | |
- | |
+ | == Faulty Power Supply and Backlights == |
- | You can check the power supply and the backlights in one swipe. (no meter needed here) This assumes that you saw no image in the [[TV Has Sound But No Picture#Section_Bad_Backlights|Bad Backlights |
+ | You can check the power supply and the backlights in one swipe. (no meter is needed here) This assumes that you saw no image in the [[TV Has Sound But No Picture#Section_Bad_Backlights|Bad Backlights]] section above. |
* Make sure the TV is unplugged. | |
* Disconnect the black cable between the main board and the power supply board. | |
* Plug the TV back in. | |
- | ** If ***no*** backlights come on, you will need to replace the power supply board or the backlights. For now, go to the next step. |
+ | ** If ***no*** backlights come on, you will need to replace the [parts|Television|power supply board|itemtype=power_supplies] or the backlights. For now, go to the next step. |
* If the backlights ***do*** come on, you know they are good, and you know the power supply board is good, especially if you had an image in the backlight test. Go to the next step. | |
- | |
+ | == Faulty Main Board == |
Now we check the main board to see if it is the culprit. if a problem shows up on half the screen or only a portion, it is likely the main board, rather than the T-Con board. | |
* Plug in the TV. | |
* Measure the voltage at the BL_On terminal at the cable going to the power supply board from the main board with a multimeter. | |
- | ** It should be zero or low. If the backlights came on in the previous step, this is just a double |
+ | ** It should be zero or low. If the backlights came on in the previous step, this is just a double-check. |
** If it is very high, that points to a main board problem. | |
- | * [link|https://www.crcindustries.com/freeze-spray-10-wt-oz/|Freeze Spray] can be useful when there's uncertainty as to which board is bad. Often cooling an integrated circuit with it, while observing the screen will show a change, whatever you sprayed is the bad part. Replace that board. |
+ | * [link|https://www.crcindustries.com/freeze-spray-10-wt-oz/|Freeze Spray] can be useful when there's uncertainty as to which board is bad. Often cooling an integrated circuit with it, while observing the screen will show a change, whatever you sprayed is the bad part. [parts|Television|Replace that board|itemtype=motherboards]. |
* If this checks out, move to the next step. | |
- | |
+ | == Faulty T-Con Board == |
This check for the T-Con board also touches on the condition of the main board. Note that problems that show up ''on half of the screen'' like bars usually point to a ''failed main board''. | |
- | T-Con board errors tend to show up ''on the whole screen''. As an example, if the error, like bars on the screen, is on the whole screen it's likely a faulty T-Con board. Some Sony |
+ | T-Con board errors tend to show up ''on the whole screen''. As an example, if the error, like bars on the screen, is on the whole screen it's likely a faulty T-Con board. Some Sony TVs are able to sense a T-Con failure and produce an error code. |
- | * Unplug the TV |
+ | * Unplug the TV |
* Disconnect the T-Con board from the main board | |
** Be careful to open the connectors for the ribbon cables on the T-Con board fully, | |
* Plug the TV back in. | |
* Note if the backlights come on. | |
- | ** If they do, the T-Con board is likely the problem, replace it. |
- | ** If no backlights, the main board is the issue, replace it. |
+ | ** If they do, the [parts|Television|T-Con board|itemtype=boards] is likely the problem, replace it. |
+ | ** If no backlights, the [parts|Television|main board|itemtype=motherboards] is the issue, replace it. |
* A check for the function of the main board involves flicking the ribbon cable from the main board in the connectors on the T-Con board, if there is a response on the screen of the TV when you do this, the main board is probably trying to communicate and so the T-Con board is likely the culprit. Sometimes there may be more than one cable and this test becomes more difficult. | |
- | |
+ | == Faulty LCD Panel == |
- | It's possible your LCD panel has failed, especially if the [[TV Has Sound But No Picture#Section_Bad_Backlights|Bad Backlights test |
+ | It's possible your LCD panel has failed, especially if the [[TV Has Sound But No Picture#Section_Bad_Backlights|Bad Backlights test]] showed no image. A common sign of panel failure is single horizontal or vertical lines in the image on the screen. Also, distorted images that are in one place only on the screen are another sign of panel failure. |
- | Many panel failures can be traced to physical abuse. Further, the construction of the panels with chips embedded in flex plastic or attached to glass makes them vulnerable to |
+ | Many panel failures can be traced to physical abuse. Further, the construction of the panels with chips embedded in flex plastic or attached to glass makes them vulnerable to unrepairable failures in those devices that surround the panel periphery. |
If you have a bad panel, at that point the economy of repair takes a hit; it's a substantial job to replace the panel, and the part is costly. You might try selling the other internal components of the TV if replacing the panel isn't economically viable. |
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