Why tv is on, volume works and can see a picture if you shine light on
TV powers on with volume, but no picture. If you shine a flashlight on the screen you can see the picture. Worked fine the night before??
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Hope This Helps :)
Quick Fixes
Try a few simple things first to try and fix your TV before replacing parts…
1 – Unplug TV overnight. Plug back in and SOMETIMES it may work and fix your issue.
2 – Unplugging the TV and everything hooked to it, then plugging it back in may clear the problem.
3 – Be sure the TV is set to the correct input. If it is set to DVI or Component input when it should be in the HDMI input this will cause issues.
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If the 3 quick fix checks above do not resolve your issue, try this:
Press the TV menu button. If no menu appears the problem could be a bad tcon display board or backlight inverter board. Turn off the room light and check TV for backlight glow. If it has a glow then the problem can be a loose tcon connection or bad tcon board. Check connections.
Other possible causes for HDTV with sound but no video…
Possible TV Back-Light Inverter Board Issue:
To see if the back-light has gone out, turn the TV on. Turn the lights off and make the room dark. Shine a flashlight onto the screen at different angles. If you can see some of the picture then the back-light has gone out. (It should glow a slight grey if it’s working) To fix this you need a TV backlight inverter board. '''You can buy one online for a relatively low price. Usually the board will have a few bad capacitors on it. You could attempt to repair it yourself if you can identify which capacitor has gone bad. A capacitor kit for a TV board is ultra cheap. You are best off buying the backlight inverter board and installing it yourself. A back-light inverter board should be from $10 to $25 dollars depending on your TV model.
-removeandreplace
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Do you know where to purchase the inverter board for this TV. I am having this exact issue for this TV
Me also it's a vinova TV . I had a problem a couple months ago with the new cable box and it couldn't be programmed into Comcast cable then a few months later this happens the TV was playing perfect it wasn't going dark and the picture was beautiful what's going on should I just take it to a TV repair I don't know if I'll be good with that inverter box
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@kathy1964 I recognize this is an old question but it does not appear to have any valid answers. Since “If you shine a flashlight on the screen you can see the picture. “ you already determined that this is a backlight issue. Your TV does not have a separate backlight inverter etc. Resetting it, or turning ift off and on will not fix the backlight.
You will have to measure the output of the power board to see LED backlight array. You can measure that directly on the connector at the power board. Samsung TV’s have the values expected, printed on the circuit board. Measure those and make sure that they are all in compliance. If you have less power as expected or none going to the backlight array, you have a power board issue. IF you do not get teh BL_on signal from the main board then that is the issue.
To test the actual backlight array, all you have to do is to remove the back of the TV and disconnect the cable from the power board to the main board. Then turn your TV on. If you do not get teh backlight turned on, it is the backlight array that has failed.
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So are you suggesting it may need a new power board and not an inverter board. I am trying to figure out which part I need to order. I have this same issue for this TV. Screen doesnt work but if I shine a flashlight I can see it.
Same here too! Is there a hidden board somewhere for the back light??
Same here. A quick flashing 'hitachi' symbol followed by a darkening street but although dark,it seems to be fine. Working menu, sound,etc.
Anyone in south Wales(Newport) how much for you to come fix my hitachi 42hxt12u backlight problem??
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Hi everyone I've had same problem with my tv with it going black but still has sound and when you shine light on it you can see picture. I went on to my picture settings changed it to standard, then went to the backlight setting and put it at its lowest and it seems to work. Yes screen is abit darker than usual but maybe can mess around with brightness ect to make it better. Hope this helps
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My hisense tv keeps going black after a while but the screen comes back after I switch it on
I have tosheba hd tv have had it for about 1 year and half today the picture went out but sound stayed on. Left it like that bout 5 minutes turned off. Shut it back on the picture came on.
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Right away it sounds like a bad cap. You'll probably have to replace the power board or have it refurbished. It's common for those to have power/led combo boards and for 1 or 2 of the smaller caps on the led side to pop and leave the power side unaffected. It is also possible that it has a separate led driver and backlight inverter. In which case I'd look at those but it's been my experience that the ones with the led backlight boards separate from the power supply end up needing new led strips. This definitely sounds like a hardware issue and the back will have to be removed for troubleshooting.
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Yes always have been one
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Mark Carter definitely confused by your answer here. Can you clarify this a bit for us?
6 件のコメント
Hi, What is the model number of your TV?
It appears as though there is a problem with the backlight circuit
jayeff さんによる
I sold mine for £30 and couple hrs later the guy tx me to say that afrer backlight replacement tv works fine. The led strips he replaced.
Ljon Morgan さんによる
I also have this problem please help me without opening the tv please
tech shop さんによる
@ tech shop
What is the model number of the TV?
If you can "see" the picture when shining a light on the TV then it cannot be fixed without removing the back cover, because you have to determine what the problem is.
It could be the LED backlights or the power board and even the mainboard.
Initially diagnostic testing and then testing using a DMM is required to find out what is the cause of the problem so that you know what to fix.
jayeff さんによる
Same I have a Samsung tv and I have to shine a flashlight to see picture The model number IS UN43J5202AFXZA
Andrew Leamon さんによる
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