Samsung DMD board replacement - Page 4

I am glad to hear that others are making progress!

In terms of my TV status, I am still going through the approval process with Visa for their "extended" warranty repair. After submitting the rational for the repair online, I had to send in the sales receipt and explaination for the claim. After a week they contacted me and told me I needed a written repair estimate. In another day they should contact me with their resolution.

BTW the shop I brought the tv to for an estaimate has originally told me a month earlier that it needed a color wheel and light engine. However, the technician who handled me at the repair store , called Samsung to get the parts needed etc. The written estimate just replaces the DLP and DMD board: total cost came to $840.

For the record these are the same part numbers as Pez's eventhought my TV is a 46" unit -HLS-S4666W ( vers PB02). So it seems all these HLS PB02 units may have the same DLP and DMD boards.

DLP 4719-001981
DMD Board BP96-01636A

The labor cost was quoted as 300$.

I don't understand why the DMD board is to be replaced and did not wish to ask. It is likely that they order it assembled which then makes the replacement trivial.

Joe

[quote=anthonyclewis;15939469]Hello everyone and thank god for this thread. I thought i was alone out there!
I noticed most of you are having problems with the white dots has anyone seen this? I have a samsung 50" dlp model# hlt5076s. Do you think that is the dmd board?[/QUOTE

I am having a hard time deciding if the darker pixels are all one color or just reduced in intensity. Since the spots are not completley white or black, it seems that you are reflecting some of the light in these pixels. For that case I'd guess that it is a timing problem with the DMD board and/or color wheel. Here the mirrors are reflecting to the right place but the amount of light is reduced. This can happen if the synchornization is off. But I don't know the details of how the synchronization is done.

It could also be that the mirrors are not responding fast enough and reduces the full amount of light , or the mirror is stuck in odd position. The latter may happen if one of the control voltages (from the DMD) to the micromirrors is incorrect and has pinned the mirror to a near off position. That would again imply the real problem is the DMD board that supplies those voltages. Then another question is if the DMD is providing the wrong voltages to the mirrors has it in some way damaged the control of the mirror.

I'd suspect that the Samsung repair solution will be to replace both the DLP and the DMD board.

Joe

Be careful since the pin confirgurations on the DMD board to the DLP are different on the PB01 and PB2 versions of PEZ's unit and my unit HLS 4666.

Sorry for any confusion. Our part numbers were the same. What I meant to say was that the PBO1 versions have a different DMD board than the PB02 versions where the pins to the DLP panel are in different locations. I beloieve that the manual you had also showed that the DLP panel for the PB01 version also had different pin locations than the panle for the PB02 version.

I ordered the DLP light panel on Wednesday from Partstore.com and it arrived on Friday ! I was surprised at how little packing it came in - only some bubble wrap around it in a very thin carbboard box !

Will install it next week sometime, and let you know how it goes !

Pez, this will be a great reference for the forzen pixel community !

I have recieved approval for full coverage for the repair bill from Visa.

I will eventually repair this unit ... right now my refrigerator is having problems.

I am still wondering why the micromirrors in these HLS units seem to be failing. Based on the research paper Samsung published on accelerated testing, the micro-mirror failure occurs with elevated temperatures. So I would believe that the heat exchanger or the fan cooling the DPL panel is not working properly. Since you have a PC background did you ever check how well the fan was doing after you fixed your unit ? Could be that Samsung saved 50 cents by putting in a smaller fan that just does not have the hosepower to cool the DPL panel. Alternately, if the ambient room temperaqture is 5-10 degrees higher than their design point and the TV is placed in a confined area the heated air may not be cooling the DPL properly. Since I live in FL and my room temp is near 78-80 degrees , that could be significant. Any thoughts on these points ???

Joe

Just though I'd comment for others that after further inspection I see that the DPL panel has a glass cover built into it to protect the micro-mirrors.