AVS › AVS Forum › Display Devices › Rear Projection Units › Samsung 46 Dlp has no picture. Can't power off.
New Posts  All Forums:Forum Nav:

Samsung 46 Dlp has no picture. Can't power off.

post #1 of 20
10/2/09 at 7:05pm
Thread Starter 
Samsung HLP-4663W 46'' Projection TV is broken at 3700 hours. I changed the lamp and it worked for a few days then started new problems. It can't be turned off unless I pull the power cord. When I plug the power cord back on, it starts itself. It keeps restarting itself for a few times until the picture comes back on. The pictures look good and will play for 1 or 2 minutes then disappear. Then the TV makes no response to either the remote or buttons on the TV. When the picture disappear, the sound is still working.
Any idears? Thanks a lot!

updates:

I bought a service manual yesterday. I checked the connections voltages on the ballast and found DMD board does send 5v to start the ballast and the ballast does have the 380v dc power from another power source. The lamp is new so it must be a bad ballast.

new updates:
I bought a ballast and replaced the bad one and the picture came back however it's missing red color. The picture is very dark. Again, the TV makes no response. I have pull power cord to shut it down.

Latest updates:
I tried to give it some pressure on the DINe chip and it seems worked. However when restarted TV today, the new ballast seems be broken.
Reply
Reply

AVS Top Picks

post #2 of 20
10/2/09 at 8:49pm
If you look in the back of the Tv can you see the lamp still on?

It could be the digital board $215, or the dmd board $370.
Reply
Reply
post #3 of 20
10/3/09 at 12:01am
Thread Starter 
The lamp is off when the pictures disappear.

Quote:
Originally Posted by hammerdwn View Post

If you look in the back of the Tv can you see the lamp still on?

It could be the digital board $215, or the dmd board $370.
Reply
Reply
post #4 of 20
10/3/09 at 12:37am
Most likely the digital board. You can try adding a little pressure to the DNIE chip on the digital board near the DVI connector to the light engine. It may work for a while or change the symptoms, but it can be a good way to be sure that the digital board is the problem. These BGA chips have had problems with bad connections.
Reply
Reply
post #5 of 20
10/3/09 at 7:11am
I had exactly the same problem with my HL-P4663 3 months ago and was able to make it stop happenng by changing my Picture/mode from dynamic to standard.
Reply
Reply
post #6 of 20
10/3/09 at 9:23am
Thread Starter 
Quote:
Originally Posted by walford View Post

I had exactly the same problem with my HL-P4663 3 months ago and was able to make it stop happenng by changing my Picture/mode from dynamic to standard.

I just checked and my picture mode was Standard.
I changed it to dynamic the pictures became blurry, dark and red then disappear again.
Reply
Reply
post #7 of 20
10/3/09 at 1:37pm
Thread Starter 
I tried but doesn't change anything. Why a bad digital board can cause this?

Quote:
Originally Posted by lcaillo View Post

Most likely the digital board. You can try adding a little pressure to the DNIE chip on the digital board near the DVI connector to the light engine. It may work for a while or change the symptoms, but it can be a good way to be sure that the digital board is the problem. These BGA chips have had problems with bad connections.
Reply
Reply
post #8 of 20
10/3/09 at 1:46pm
I did not expect switching back to Standard to fix anything that was not a problem before. I only expected that if you were on Dynamic before that Standard might fix your problem since AFAIK it puts less of load on some of the cards in the system/
Reply
Reply
post #9 of 20
10/3/09 at 4:46pm
Thread Starter 
I see. Thank you!
Quote:
Originally Posted by walford View Post

I did not expect switching back to Standard to fix anything that was not a problem before. I only expected that if you were on Dynamic before that Standard might fix your problem since AFAIK it puts less of load on some of the cards in the system/
Reply
Reply
post #10 of 20
10/3/09 at 6:40pm
Thread Starter 
Quote:
Originally Posted by hammerdwn View Post

If you look in the back of the Tv can you see the lamp still on?

It could be the digital board $215, or the dmd board $370.

I understand dmd board may cause the lamp doesn't start but how come a digital board can cause the same issue? Thanks!
Reply
Reply
post #11 of 20
10/3/09 at 6:40pm
Quote:
Originally Posted by accent View Post

I tried but doesn't change anything. Why a bad digital board can cause this?

I have seen very similar symptoms with the DNIE chip problems. Most likely communications with the micro or with the light engine getting disrupted. The problem is that it is a BGA chip and the connections underneath are not made well. It certainly could be something else, but this is relatively common.
Reply
Reply
post #12 of 20
10/5/09 at 11:01am
Thread Starter 
Quote:
Originally Posted by lcaillo View Post

I have seen very similar symptoms with the DNIE chip problems. Most likely communications with the micro or with the light engine getting disrupted. The problem is that it is a BGA chip and the connections underneath are not made well. It certainly could be something else, but this is relatively common.

Thanks for the info.
Reply
Reply
post #13 of 20
10/5/09 at 11:05am
Thread Starter 
I bought a service manual yesterday. I checked the connections voltages on the ballast and found DMD board does send 5v to start the ballast and the ballast does have the 380v dc power from another power source. The lamp is new so it must be a bad ballast. It must be damaged when our house had power issues.
Is there a easy way to fix the ballast instead of replacing it?
Reply
Reply
post #14 of 20
10/5/09 at 11:57am
IMO, it's probably harder/more expensive to try and *fix* a ballast than replace it. I just replaced a ballast in an HLS4676 and it was a $60 part, 30 minute job (for a first-time job, too).

I could be wrong, but I can't imagine trying to fix it would take any less time or less money ... maybe an expert would disagree.
Reply
Reply
post #15 of 20
10/5/09 at 9:48pm
Parts are usually not available to fix a ballast and it is very difficult to test them. There is also little documentation for most of them. I know of no one who even bothers to try.
Reply
Reply
post #16 of 20
10/8/09 at 10:00pm
Thread Starter 
Quote:
Originally Posted by lcaillo View Post

Parts are usually not available to fix a ballast and it is very difficult to test them. There is also little documentation for most of them. I know of no one who even bothers to try.

Yeah, that is true. I bought a $35 ballast on ebay and installed it tonight. The picture comes out now but the TV still has other problems. The picture was good for about 1 minutes then it became dark green. The sound is still good. Again, this TV makes no response to either remote or power buttons. Any idears? Thanks again!
Reply
Reply
post #17 of 20
10/8/09 at 10:18pm
I gave you my idea, based on quite a lot of experience with these units. You likely have a bad digital board.
Reply
Reply
post #18 of 20
10/9/09 at 5:13pm
Thread Starter 
Quote:
Originally Posted by lcaillo View Post

I gave you my idea, based on quite a lot of experience with these units. You likely have a bad digital board.

Thank you for the info! Yes, the digital board is broken too. I pressed the chip on the digital board and the pictures became normal.
I think there must be something else broken in the unit because the new ballast I put in yesterday doesn't work any more. How come this unit keep burning ballast? Thanks again!
Reply
Reply
post #19 of 20
10/10/09 at 11:08am
The ballast is likely fine.
Reply
Reply
post #20 of 20
10/18/09 at 10:46pm
Thread Starter 
Quote:
Originally Posted by lcaillo View Post

The ballast is likely fine.

Yeah, lcaillo, you are right! The ballast is fine and yes, the digital board was bad. I also found the TV had a bad LVDS cable and a over heated DMD board or color wheel. After I changed the LVDS Cable to a good DVI-D cable and apply a 12watt cooling fan into the TV, the TV is working now.
lcaillo, thank you very very much for the help!
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Rear Projection Units

AVS Top Picks

AVS › AVS Forum › Display Devices › Rear Projection Units › Samsung 46 Dlp has no picture. Can't power off.