Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help) - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 12 Old 11-03-10, 12:47 AM Thread Starter
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Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Hello all.

First post. Looking to help narrow down my issue.

Let me start by saying "I know....use the search function."
I've been googling this problem for over a week, every night and am still unsure what to do.

Here's the details.

Samsung 50" DLP
Model: HLR5067W(AX)
Manufactured in 2006

Got it from a guy I work with.
He said a while back it would just 'shut off'. Would run for hours then screen just goes black, still have audio for a few seconds then unit shuts off. He said now it's every 10 minutes or so and just bought a plasma.
Currently have zero $$ invested other than a thermostat (which didn't obviously work).

When turning the unit on at first, the lamp light flashes, I get the 'jingle' (if you will) and hear something spinning up (or so it seems), then a pause, then another spin up (sounds like a hard drive to be honest...I work in IT, but I don't see a HDD anywhere inside the unit. Seems that it's either the color wheel or ballast making the sound, but cannot narrow it down). Lamp turns on, dim at first, then comes on fine and the lamp light on the front of the unit goes out. Appears to be functioning fine.

Unit runs and processes HD programming via component cables (Directv HD box) for approx 10 minutes. Brightness looks fine, picture quality is great.
Then "POOF", screen goes black, still get audio for a few seconds and then the unit powers off and all three LED's on the front of the TV power button flash. Unplug, let sit for a minute, fire it up again, repeats process to a T. However, when the TV is warmer it SEEMS to be somewhat shorter time before it shuts off.

When I first got it home I took the back covers off and blew out all the boards/fans, etc with an air compressor, keeping the volume of air down to not damage anything. There was significant dust/debris, but not more than I've seen in PC's by a longshot. I'm fairly certain I have most of the dust removed.

Troubleshooting steps:

1. New thermostat. No change. I even tried 'jumping' the thermostat circuit (with a PC motherboard/drive jumper) to eliminate any heat issues and it makes no difference.

2. Tried running a fan on the back of the boards/components with the back cover off while running the TV. Fan was blowing air INTO the unit, not venting per se. This did however seem to keep it MUCH cooler. Seemed ONCE to have run a bit longer than normal, but still same issues. Screen black with audio for a few seconds, then powers off with 3 LED's on front.

3. Connected laptop to VGA port in attempt to bypass one of the boards (analog or digital...not sure yet because I'm still learning), but it didn't matter because it did the same thing.

4. ETA: I tried the lamp cover blue switch issue as well. I even jumped this as well; but it provided no change.

I'm certain it's not the thermostat or lamp cover switch issues that are common.

Got into 'setup' mode or whatever you call it by hitting MUTE, 1,8,2 power.
Lamp said 8600 hours and guy I got the TV from said he's never changed it. So that's on order as of tonight.
(cheaper first, rigth?) Performed a reset on the lamp hours and a general TV reset. No change other than I had to specify the source back to component 2 after doing this. No change. Same exact results.

NOW.....the other night I was trying some different angles for cooling with the fan and upon turning it on, my screen (for the very first time) displayed a 'grid' of white boxes and the football game behind it. These boxes weren't 'full' but more were symmetrical across the entire screen.

They were LIKE THIS: gadgetbench.com/hlpnotes/pixel_mapping_off.gif
NOT like this: fixya.com/uploads/Images/CC064CB.jpg

The difference is they weren't solid boxes as in first photo. They were "Pixelated".
However, it only did this twice and after I unplugged the power it hasn't done it since, but honestly at 10 minutes a pop before shutdown and another failed test, I haven't had the TV running much.
I'm sure it means I have an issue that's manifesting, but I thought it would be prudent to the troubleshooting notes.

So where I'm at is this;

I don't know if this is a power supply issue, a ballast issue, a lamp issue (certainly won't fix the white boxes), or some other issue such as the light engine, color wheel (doubt this) or the chip issue that some where fixing by having the soldering 'baked' by the guy in Michigan (yes, I read that entire 30 page thread tonight).

I think that's all I can offer for now. Feel free to ask questions, but I could sure use some assistance getting it resolved.

Thanks everyone!

Chris

Last edited by fruitjacket; 11-03-10 at 01:41 AM.
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post #2 of 12 Old 11-03-10, 08:24 AM
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Start with a new lamp and check the power supply and ballast for the problem with the shutting down. The other issue sounds like a digital or DMD problem.

Looking for me, just google my username. I have used the same one for most sites for many years.
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post #3 of 12 Old 11-03-10, 09:43 AM Thread Starter
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Quote:
lcaillo wrote: View Post
Start with a new lamp and check the power supply and ballast for the problem with the shutting down. The other issue sounds like a digital or DMD problem.
Thanks for your help. I will post an update once the lamp arrives and it is installed.

Do you have any links or quick info on how to test the power supply/ballast?
Or are you simply recommending replacement of both items?
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post #4 of 12 Old 11-04-10, 03:58 PM Thread Starter
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Still waiting on bulb.

Last night I pulled all 3 major components out. The analog/digital boards, the light engine assembly and power supply and cleaned them all more thoroughly with compressed air. Documented the wires/connections to the digital boards, so I'm pretty confident I reconnected them properly.

But when I turned it on, this is what I got.
(Note, this was with a standard definition cable TV coax connector to the cable input)

(insert the "h)ttp://www.youtube.com/watch?v=r72-8UHMRjk

As you can see, the menu displays with zero deficiencies, but the cable signal is all green screen.
I'll test again with a laptop to see how that display works.

But with the newly apparent green screen issues, does this point towards my digital board/DNIE chip being a problem?
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post #5 of 12 Old 11-04-10, 04:17 PM Thread Starter
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Link made hot: http://www.youtube.com/watch?v=r72-8UHMRjk
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post #6 of 12 Old 11-04-10, 06:14 PM
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

The digital board is most likely, IME.

Looking for me, just google my username. I have used the same one for most sites for many years.
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post #7 of 12 Old 11-04-10, 07:48 PM Thread Starter
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Quote:
lcaillo wrote: View Post
The digital board is most likely, IME.
IME? ETA: IME = In My Experience?

Sorry..not up on all the acronyms yet.

Do you think this issue is causing the unit to power off as well?

Do you think it's worth it (not going to hold you to anything...just an opinion) to have it sent to that guy in MI to have it heated up or reballed? Or should I go with a replacement?
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post #8 of 12 Old 11-05-10, 10:39 AM
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

In My Experience.

Shutting down with all three LEDs flashing is most often a bad lamp. It could certainly be other things, but the first thing that any tech will verify is that you have a good lamp. No way to do that but to put a new one in, which most decent techs will have in stock, as this is a common one.

It sounds like you also have a digital or DMD board problem, though again, there could be other reasons for the symptoms you have. There is no way to narrow it down except troubleshooting. You check the obvious and work from there.

Looking for me, just google my username. I have used the same one for most sites for many years.
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post #9 of 12 Old 11-05-10, 10:41 AM Thread Starter
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Quote:
lcaillo wrote: View Post
In My Experience.

Shutting down with all three LEDs flashing is most often a bad lamp. It could certainly be other things, but the first thing that any tech will verify is that you have a good lamp. No way to do that but to put a new one in, which most decent techs will have in stock, as this is a common one.

It sounds like you also have a digital or DMD board problem, though again, there could be other reasons for the symptoms you have. There is no way to narrow it down except troubleshooting. You check the obvious and work from there.
Lamp should arrive today or tomorrow. I pulled the digital board last night and just decided to order one from samsung parts.

I'll keep you posted. Thanks for the input. I appreciate it.
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post #10 of 12 Old 11-18-10, 05:41 AM
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Re: Newbie with Samsung DLP issues **Unit turns off after 10 minutes** (looking for some help)

Hey FJ,

Your original issue sounds more like mine (http://www.hometheatershack.com/foru...o-remains.html) than probably any I've read over the web.

I was also under the impression that the screen-offs were arbitrary or time related, but a couple of months into it realized they had to do with the brightness level of the currently displayed frames.
It would be great if you could verify it (either after fixing this new addition to your issues or resorting to your memory...):
- this should occur less often on 4:3 settings (than 16:9); I actually moved mine to LD 4:3 on all inputs.
- If you pause your tv on a mostly black frame for a couple of minutes, then try a mostly white one (could also use VGA to manufacture a low vs. high brightness image), you should be able to see reproduce the shut-off
- Playing with the brightness settings (under Picture, in the TV's user/setup menu), taking it low for a while and then high for a test, should also give an indication.

If you manage to reproduce the issue with my techniques - my findings might assist, and definitely your earlier input helps me choose the next move.

Thanks + eagerly awaiting your findings,

N.
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