TV Repair Questions? Ask a TV Technician
Welcome to the site! I'm Dan. Please let me know when you've joined the chat.
I'll need to know a little more about the symptoms...
When you press the power button, does the color wheel spin?
picture comes on and looks good
How long until it shuts down?
10 seconds 15 maybe
i can barely get into the service screen then its off
10-15 seconds after you get a picture?
Where did you get the new parts?
The lamp, specifically.
discount merchant i believe
it came in a new housing as well
And did that change the symptoms, at all?
i did the ballast, and then the lamp
What's the part number on the ballast you put in?
and i could hear the color wheel when it was turning off so i figured the bearing was going bad and replaced it
let me check, one second
item # XXXXX
OK. Same as what you pulled out?
yes i compared them and even switched them back and forth
i appriciate your help by the way
No problem at all. You might not like the diagnosis, though... ha.
haha it is what it is
But I've got to be honest with you... I really think you've got a bad DMD board in there.
yea, i thought so
Either that, or maybe a weak/failing power supply.
it would act the same way if the dmd board was bad?
yea, how do you test the power supply
Well, the DMD can cause all sort of things. It's pretty much 4/4 on the list, but you've already replaced 1-3.
Testing the power supply with these symptoms would be really tough. You're not getting a stable enough system, really, for any readings you take to be totally valid, in my opinion.
dmd is the main mother board, or the small board by the projector behind the fan
The good news, though, is you can get a used/refurbished DMD for your TV for about $50. With a warranty.
o wow thats reasonable
Small, rectangular board on the light engine.
It holds the DLP chip.
yes i have takin it out and put it back once already
Yep, it's cheap because it won't come with the DLP chip. The chip is about $300, usually, but there's no reason to suspect the chip... just the circuit board.
thinking the color wheel was in the light engine
maybe i messed it up R and I it
Part number should be BP94-02269A, but I would take a good look at yours first.
are there any sensors other than the the back door switch that would be doing this
No. And if it was the door switch, you wouldn't be getting 15 seconds of video.
Now that I think of it... have you checked the fans?
Do they all spin freely when you power the TV on?
here and there i get a check fan no 2 but i replaced it
but not with a samsung part...like a computer fan with same voltage and wattage
Hm. I don't recommend that.
so its on and its not too hot in there....
yea i was gunna try a new samsung fan, does it knw when its not a samsung fan
and is there anyway to hard reset the system besides unplugging it
The original fans tie into the TV's safety circuit with a feedback voltage.
Hard/impossible for me to say if the PC fan will work.
I would probably order a new fan and the DMD. They're inexpensive.
yes i will do that
And double/triple check the other fans, too, to make sure they're spinning freely.
hope that will fix it
theres only one other one
I tap the motor/center of the fan with a screwdriver handle.
That helps, sometimes.
I don't recall if there's 2 or 3, and can't get to my service data right now. Do you have the service manual?
not with me
ive reassembled this thing a million times by now, ive only seen the lamp fan and dmd board
Do you have an exhaust fan pointing out of the back of the set?
no theres a fan by the ballast that goes to the lamp and through a plastic grate thing that sits in front of the lamp and out the back
Well, fan and DMD... that's my advice.
its not near a wall ive cleaned all the dust, dos the temp sensor go bad?
Thermistor would be similar to the lamp door switch, in that, you wouldn't be getting video.
ok, hopefully i can get it goin with those inexpensive parts
ShopJimmy.com for the board.
Call them... don't use the site.
My pleasure! Good luck!