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54 posts

Master Geek
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Topic # 116955 14-May-2013 22:09
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Hi everyone,

I've just spent an hour of my life Googling this TV model and similar sounding issues with other manufacturers (Namely Samsung) but I'm non the wiser as to what's up with my telly (Apart from that it doesn't work properly!)

It was working fine and had been for over a year and then a few days ago, I switched it off at the mains without first switching off the unit - as I have done many, many times without issue) - and the next time I turned it on; Sound, but a blank screen.

The buttons on the side of the unit, don't so anything - as in - I don't see any menus or other screens. The remote has brand-new batteries and all it does is turn the TV on and off, no other remote-functions have any effect and the IR receiver doesn't change colour of flicker as it should do when pressing any buttons on the remote other than on/off.

If I turn it off at the wall and back on again, or just turn it on-off via the remote, I see what I think is the screen-saver for the TV which says "Store/Dynamic Mode" for about 5s. Once that goes away, the screen remains blank and the sound comes on.

I have read that you should see if the screen shows a glow around the edge with the lights off in the room - answer, yes there is a glow. Shining a torch close to it, or around to see if there is a faint picture to go with the sound = no, no such result.

My next step is to pull the back off the unit and check for obvious melted or domed caps, but if there's nothing so obvious, I'm stuck.

Does anyone have any idea what else I might try? I'm all out of ideas!

Cheers
Russ

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Uber Geek
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  Reply # 817816 15-May-2013 04:50
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Most likely the backlight power supply capacitors. With modern TVs with all the coatings/layers you are unlikely to see a picture with a torch. That 5s faint message is a hint the display is working but no backlight, Samsung shows the messages very bright. And don't switch off at the wall, it stresses the power supply and risks corrupting the software (if a smart TV), first switch off with the remote if you really have to save the minute standby power for which there are regulations to ensure it is very little on modern products (Europe is proactive in reducing the standby power limit, NZ is catching up, US don't care).




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  Reply # 817829 15-May-2013 07:54
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If it's only a year old just call the retailer and have them repair/replace under consumer guarantees.




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54 posts

Master Geek
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  Reply # 817831 15-May-2013 08:06
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Thanks very much for taking the time to reply.

I was under the impression that the backlight was working, if the glow could be seen around the edge, with the lights in the room dimmed. Or does that actually mean something completely different?

The telly is probably well over a year old and was purchased from the good old Warehouse, for very few dollars in a sale. We no longer have the receipt for it, but I will have a squiz at the consumer guarantees process, I hadn't thought of that.

Many thanks again
Russ

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  Reply # 817835 15-May-2013 08:09
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Without a receipt they won't help you, and rightly so. I scan all my receipts to my PC as soon as I buy something, I keep them in my backups and in an online backup service.

Unless you're an electrician the best course of action with no receipt is to take it to a repair place to look at.




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  Reply # 820272 15-May-2013 19:28
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For a 19" (I guess), don't bother with repair. The glow might be the backlight driver trying to start-up but detecting a fault so the voltage does not get high enough. One failure mode for capacitors is a high leakage current which could be similar to the current required to drive a series chain of LEDs. Or the backlight might be working and it is something else (but less likely). The backlight should spill a fair bit of light into the inside of the TV which usually can be seen even through the vent grills.




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