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I have a 5 yr old samsung dlp model hlp5663w. Replaced colorwheel and it worked fine. Now I lose the picture. Sound stays on and lamp stays lit. Fans still running but no picture. Replaced lamp but it still loses picture after a while. Have to turn off set for a while and then when I turn it back on it'll work for a couple hours then the pic goes out again.

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Above is your user manual, below is your service manual. It is a pay for one, but i searched and was unable to find a free one, but to even have a chance you MUST get a service manual.

Before we can attempt to repair anything at all, there is one thing that one MUST do before anything else is done. Now that is, the making sure that the Power Supply,of the unit, no matter what it is, has the correct Voltages, coming into it, and more importantly, coming OUT of it. This is absolutely imperative, as, IF these Voltages are NOT correct then NOTHING will work, properly at all. So we must measure these voltages with a Volt Meter. All Voltage measurements are made with reference to ground. Meaning we clip, our Black, Minus, Lead onto the Earth, or Chassis, or Negative (-) "Rail" of the Power Supply. Now with the Red lead, we can now, measure these Voltages. Now sometimes, the Voltage of each Output is annotated,or written, onto the PCB, that will indicate the Voltage of that output. However most usually they are NOT, so in this case we MUST have a manual to tell us. Now this manual is called a "Service Manual" or sometimes a "Repair manual" This manual is absolutely vital so much so, that it can be near impossible to do without it. As apart from having "Troubleshooting" step through's, it also has our Voltages. When we measure these Voltages they are 100% EXACT, so IF the Voltage you measure, except for a few rare exceptions, the "Rail" that is NOT at the correct voltage is the one, that the "Fault/Cause" is "ON". Therefore we can now work outwards from the Power Supply, looking for the cause of that problem. Now if the Voltage is Lower than specified, we are invariably looking for a "Short", something has "Faulted" and is "Dragging" the Power Rail down to earth. Now if the "Rail" is "Higher" than the specified Voltage then the fault we are looking for is usually some sort of "Open Circuit" possibly a Diode, or resistor that has changed it's "Value". Now knowing this and knowing that the Power Supply is the FIRST place to start you troubleshooting and repair from. You now have a MUCH better chance of a "Fix". One thing more, DO NOT forget to get your SERVICE MANUAL. for you exact make & model. even if you pay for it, you will be glad you did.

The set Turning OFF is the key after a while, what is happening is that some component most likely in the PSU, is breaking down, under thermal load, now the fix for this is to get some Freeze Spray, from say Radio Shack etc, and in the PSU, carefully spray it on the components that are hot, try the hottest first, and the one that when you spray it clears or reduces the fault, is the faulty one.

But as always first you must check, are your voltages correct, measure them all.

Posted on Sep 10, 2010

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