Question about Samsung HP-R4252 42 in. Plasma HDTV

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NO PICTURE, HELP

Had this model 18months fault occured the other night wereby screen had 2 large black horizontal lines appeard then went blank and have no picture at all but still have power+sound need HELP PLEASE ANYBODY

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You had some buffer ic's fail.Depending on the model these ic's are intergrated into ihe plasma panel.if that is the case,it is cheaper to replace the unit with a new one.

Posted on Mar 05, 2008

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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Line faults to all LCD screen are similar, irrespective of its brand and screen size.
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http://electronicshelponline.blogspot.com/
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Samsung pn51d440a5d thin black horizontal lines across complete screen,2 to 3 inches apart,replaced y sustain and y buffer pcb


These lines a are technically called as 'vertical retrace' lines. There will be thin white horizontal lines, at about 1" apart, all around the screen. Even though, you've decreased the brightness and contrast to its minimum, these line will be there. There are many reasons for this fault. If the screen voltage is more than normal, or the supply voltage to video output transistors are less than normal [due to faulty smoothing capacitor], this fault can occur. If you're sound in electronics, check this link. It has details about how to check for this fault. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.

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At first it was lots of horizontal lines over the screen, and later TV screen went completely black. The sound still is perfect. Perhaps I just need to replace the fuse? I love this TV! Thanks...


Hello
You have stated that your TV has a lot of horizontal lines before it went off picture. We say that lines as retrace lines. So many of them will there on the entire screen, at about one inch or so apart, horizontaly scattered along with picuture. At that time, you may be unable to down the brightness control also. Even though you have reduced the brightness control to zero position, there will be some brightness level on the screen. You should have to repair that fault at the begining. There is a voltage going to the picture tube base, known as screen voltage. That voltage determine the emission of the picture tube, and we call it a bias voltage. When it goes higher than normal, this trouble ie retrace lines will occur. In long run it may spoil the picture tube itself. I don't know what the case of yours.
Anyway it is best for you to consult an experience technician in this case. Ok.

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It sounds as if it has a video processing problem or the LCD panel is going bad. Can you feel the scratches? If not it is in the panel. Also it could also be the set top box or cable box if you are using one. Also try another source like a DVD player. If it is still there, then it sounds like what i stated above. Good luck and keep me posted. Guru Jay

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1 Answer

Problem with tv


Could be a horizontal output fault, faulty power supply, a simple dry solder joint or HVT. If you can hear arcing or smell an ozone odour, it will be the HVT which may cost a bit.

Without knowing the actual cause, it's impossible to say how much it would cost to fix it.... could be anywhere from $50 to $250 etc

Best to have it checked by a technician and get a quote to repair... then decide if you think it's worth it.

Toshiba is generally a reliable brand, so if you were happy with the picture quality before the fault occurred, it's probably worth repairing.

Cheers

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