Question about Samsung HL-T4675S Television

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All green screen

My problem is that when my TV powers up, I no longer get a picture, but a all green screen. Please help.

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Sounds like the digital board is the problem.

Posted on May 04, 2008

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TV Screen went green, LG 21" CRT TV


The expert addressed no longer seems to be posting answers on this site.

I would suspect the trouble is one of two things---a shorted device like an IC on the board at the end of the picture tube---most sets use either 3 transistors, one larger IC or 3 individual chips---first thing is to examine the soldering on that board looking for any broken connections.

If you can find a schematic for the set voltage checks will pinpoint where the issue is---an old trick if uses 3 transistors or 3 chips is to identify which is green and swap it for one of the other 2 if numbers on them are identical.

Second and fatal possible reason is the green gun in the CRT picture tube is shorted---almost no way around that as the tube itself would have to be replaced---most modern shops are able to test the tube and determine if shorted or not.

SD TECH

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1 Answer

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1 Answer

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Hmm my dad's old t.v. just cut out on him it took awile to turn on this my be the end of ur tv so this might be a power problem but older t.v. loose there colour on the screen my uncle had a like 10-15 year old t.v the screen was like green when it was light but when u turned of the light or closed the blind's it's picture was ok so try that.

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the tv had intermittant solder connections already but h\they appeared when the tv was moved to hook up the digi-box. The solution could be as simple as resoldering the power convergence amps.

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2 Answers

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a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.

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Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.

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1 Answer

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Go to the convergence and align the red and blue + - Under Menu then Picture then convergence to get to this screen- Hope it helps

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