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Samsung Plasma tv will not turn on


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Old 15-09-2009, 16:14
monument7
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Hi,
I hope someone can help.
I have a Sansung Plasma model No PS-42Q96HD. It went off and would not turn on but as in other links it was clicking.
After searching forums I took the main board off hoping to find blown capacitors but these were ok.
On checking the rest of the board I noticed a dry joint that was burnt as if it had been shorting. As you look at the board it was on the centre Aluminium strip. One of the 4 components with three legs screwed to it. I cleaned the joint up and soldered it.
Thinking I had cured it I put board back in and plugged power lead in.
It was like the Meerkat ad. zzzzzzt with a few sparks and a singed area about a square inch next to the dry joint but not on it.
Now the TV does nothing.
HELP!!!!!
Dave
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Old 15-09-2009, 16:52
chrisjr
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The technical term for what has happened rhymes with "it's ducked"

At a rough guess I would say the aluminium strip is some form of heatsink to which a number of transistors are attached (the things with three legs). And would I also be right in saying your knowledge of electronics is limited

If so I would put the soldering iron away and seek professional help. it is all too easy, even for those of us well used to soldering irons, to short out pads on a PCB by accident and not notice (been there read the tee shirt ). The consequences of which can be rather serious depending on what you have managed to short out.

Usually when electronics put on a fireworks display something pretty terminal has happened to some component. Where the burnt patch is there may have been a resistor or similar component that has been forced to carry more voltage or current than it was designed to handle and has committed suicide as a result.

Time to open the wallet I fear....
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Old 17-09-2009, 16:52
monument7
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Thank you for stating the obvious after the event ha ha. I thought I was doing ever so well to find a fault then down to earth with a bump.
This was shot to nothing as I was prepared to buy a new board if I couldn't find an obvious fault.
The next question is where can I get one.
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Old 17-09-2009, 17:59
Nigel Goodwin
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Thank you for stating the obvious after the event ha ha. I thought I was doing ever so well to find a fault then down to earth with a bump.
This was shot to nothing as I was prepared to buy a new board if I couldn't find an obvious fault.
The next question is where can I get one.
You might try CHS?
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Old 17-09-2009, 19:36
Tassium
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You might try Ebay to find the identical model but with a smashed screen.

I have just looked and there are two (at least, I just search on the full model number)

Unfortunately both have circuit issues rather than screen in pieces issues.

http://cgi.ebay.co.uk/FAULTY-Samsung...d=p3286.c0.m14

http://cgi.ebay.co.uk/FAULTY-Samsung...d=p3286.c0.m14
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Old 22-09-2009, 09:28
the chimp
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Are you any good with a soldering iron ?

I repaired my own quite easily only yesterday, price of parts.......


£2.46 !!!
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Old 23-09-2009, 13:43
st3v3yb0y
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This is the f30a chassis and is well known for dry joints around the heatsink mounted transistors.
If you are not used to de/resoldering then a call to a repair center may save you a lot of grief.
If you give me your location I could aim you in the direction of someone.

Wow first post!!
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