I have a large Samsung rear projection TV, model No. SP42W5HFX. The problem is it rarely turns on, and when it does it lasts about half an hour and then turns off, (goes black). When it is on it works perfectly, so its not a bulb or anything, I'm thinking it might be a loose connection, but I've taken the back panel off and I'm overwhelmed by the amount of components.
At the moment it won't turn on at all, but I do get a red light (standby/power light), then it goes out, then flashes 7 times, then goes out again. This appears to be a code that helps identify the problem but I don't have the manual or anything as I bought it from a friend.
Thanks for your time and look forward to solving this!
Can anyone tell me if its possible 2 fix an intermittent control board fault in a samsung rear projection myself and if it is do you know how to? thanks..cheryl
Posted on Sep 18, 2009
Hi.
Im certain I can help you there are basically 2 fixes that spring to mind for this fault.
First fix : RESOLDER IC801S ON POWER PCB.
SEVERAL PINS ARE DRY JOINT NORMALLY.
Try the first fix before attempting the more difficult second fix.
You will need soldering iron with a tip of approx 1.6mm & 0.7mm fluxed solder.
Take notes & pictures of pcb layout plugs & sockets before unpluging anything in side the tv set.
The first fix is easy you just need to find IC801S & resolder all it legs (pins) to the pcb. To find the IC follow the mains input from the switch to the PSU board The IC will be very close.
********** IMPORTANT ENSURE TV IS UNPLUGGED FROM MAINS POWER ********
TV SETS STILL HOLD ELECTRICAL CHARGES EVEN WHEN SWITCHED OFF.
IF YOU ARE NOT CONFIDENT TO UNDERTAKE A REPAIR ON YOUR TV PLEASE GET A QUALIFIED TV TECHICIAN TO DO THE WORK FOR YOU.
Second fix : CHECK R437(1.8 OHM) RESISTOR ON DEFLECTION PCB,
IF O/C CHECK IC501, IC531, IC561 ON CRT BASES FOR SHORT CIRCUIT.
http://dysonmanuals.llc.nu/
Chris..
Posted on Dec 30, 2007
Hi.
Sorry there isnt.
The IC801S number will be printed on the circuit board directly next to the component.
http://dysonmanuals.llc.nu/
Chris..
Hi.
Dont bother looking for the IC if you have sound when fault is present.
I thought you meant set went completely off sound & picture.
The IC will not be the problem.
What will help is did you notice if the 3 crt tubes iluminate when viewing them from the back of set. You will need to get right down low to see if there is a oronge glow coming from the neck of each crt you will need to look hard to see it.
Chris..
Hi.
When you saw the 3 tubes lit from behind was the set in its faulty state ?
http://dysonmanuals.llc.nu/
Chris..
Hi,
Right ok you need to find IC801S ON POWER PCB & resolder it.
Post your email address & I will send circuit diagram of power supply.
http://dysonmanuals.llc.nu/
Chris
Hi
This is part of psu diagram showing the STR reg position number IC801S in psu
I do have whole page of psu but I would need to email it its to big to post as picture.
Chris..
Hi.
No you wont need to remove components but you will require pulling some plugs out & maybe removing some screws to get at the IC.
Im at work at present & I have circuit diagram at home will email it to you later.
http://dysonmanuals.llc.nu/
Chris..
Hi.
Sent full manual to your email.
Its A large file 14mb have sent it as rar but once you extract it is pdf.
http://dysonmanuals.llc.nu/
Regards Chris..
Your wellcome.
Chris.
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Hi 
Thanks Chris, I'll give it a go. Is there a link you know of so I can see a visual of the components I'm supposed to solder?
Hi Chris,
I had a look at the TV and still no luck. I followed the wires from the ON switch, (and power cable after), down to the circuit board and the connection between these is not an IC chip, it is a more like a plastic socket connecting to protruding prongs coming out of the circuit board, these prongs measure about 1.5mm wide and 8mm long (approx). I can't see a way to solder these.
Now, about the bunch of wires that lead down from the ON switch, about 14 are grey and 2 brown, half of the grey wires lead off to an external panel used for external speakers and video recorder playback, and the other half to the PSU board.
The thing is it worked after I unplugged and replugged these connectors, but this was just coincidence because after about 2 hours of working it stopped again. I tried to fiddle about with these connectors again but it wouldn't turn on again. I have realised that I always get sound, but no picture.
All help is greatly appreciated
Thanks in advance
Chris,
I have looked again at the TV and ALL three crt tubes are glowing at the base, like a dim light bulb.
Now what?
Thanks in advance
Yes. I press the on switch and hear things happening, and I hear that familiar static sound like the screen is trying to turn on but remains black.
Hi Chris,
Could you send it to sxsi@aol.com, thanks. Will I have to remove any other components to get at it?
I've got it thanks! Which page should I be referring to?
All sorted. I took said components out and cleaned up the circuit board beneath it and now it works fine. Thanks a million!
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