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TV Tech1
TV Tech1, Technician
Category: TV
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Experience:  30 Years experience. Authorized Warranty servicer.
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Samsung 50 inch DLP TV wont turn on. Green LED in the center

Customer Question

Samsung 50 inch DLP TV won't turn on. Green LED in the center lights up but no projector lamp. If I unplug the TV overnight, it usually comes back on. I've pulled the lamp out and cleaned out all the dust as best I can. Also, I can't turn the power off using the remote or the on/off button on the TV when this occurs. Any ideas?
Submitted: 5 years ago.
Category: TV
Expert:  TV Tech1 replied 5 years ago.

Can't turn it On and Off unless you unplug it....That sounds like your Microprocessor is locking up on you.


Have you ever tried turning it back off right after the TV is turned on, to see if the unit locks up? I'm thinking this problem might be related to the micro switching Modes, or possibly heat-related.


The way to test this....see if you can turn on and off before the Picture and Sound take over. Then turn it on...see if you can turn it off AFTER the picture/sound take over.


If it does, check to see if you can adjust volume and access menu.


These are step by step test procedures.


Lastly, Wait... give it an hour and see if you LOSE the ability to adjust volume or activate the menu. Then turn it off and see if you lose all control of the TV --check the remote, then check the Keyboard on the TV.


The Key tests are the On/off before and after the TV exchanges control to the Picture/Sound circuits.


Customer: replied 5 years ago.
I can't turn the TV off immediately after turning it on when there are no audible bleeps within the first 5 seconds or so after turining the TV on. If I do get the bleeps immediately after turning the TV on, I almost always get a picture and I can turn the TV off. If I don't get the bleeps within seconds after powering on the TV and wait a few minutes, the bleeps finally come, but there is still no picture, and the lamp LED continues to flash. If the TV comes on and I get a picture, I have no other problems. One thing I have noticed is that the problem always occurs when somebody tries to change the input (e.g. switch from AT&T box to X-Box, DVD, etc.). Once the input is changed, I have to unplug the TV and wait overnight. Sometimes though, even if the input hasn't been changed, the TV may not produce a picture. This has been going on for 3 months or more.
Expert:  TV Tech1 replied 5 years ago.

That would be your DMD board, which is located right behind the fan in the center of your TV set.


The older models have some disassembly drawings, but they're worthless compared to the newer models --



Not much detail in those....


The DMD part number is -- BP94-00478A


I Googled about 10 suppliers with your part number. It's either out of stock or no longer available.


I suspect the only way to get one right now is by buying an optical engine.

The part number for the Engine -- BP96-00087A


Here's one --


Looks like the engine is available, but the DMD isn't, so the only choice is to buy the Optical engine with the DMD board on it.


Once you get that part, let me know. I've got better pictures of the light engine and how to get it out.


Most engines on Samsungs all come out the same way. Your model has drawings only. They moved to pictures a few years later and those help you out a lot better than their drawings do.


If you have any questions, just ask

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Tips are greatly appreciated !


Thank you.