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Forum: Rear Projection Units   09-02-2014, 11:28 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Don't know about "trustworthy", but there is a...

Don't know about "trustworthy", but there is a post about 4 months old that has a link to the service manual, and the link appears to still work.
...
Forum: Rear Projection Units   08-31-2014, 07:46 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Those symptoms sound like something is overriding...

Those symptoms sound like something is overriding the IR signal. Perhaps one of the side panel buttons is "stuck" sending a continuous command, or your remote or another remote in the room is stuck,...
Forum: Rear Projection Units   08-31-2014, 07:22 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
As I understand it, the color sensor is used by...

As I understand it, the color sensor is used by the control processor to check that the 3 LEDs are producing light. The sensor does not affect the light control values, per se. If it was bad, the...
Forum: Rear Projection Units   08-25-2014, 12:54 AM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
If the blue LED is not working, everything will...

If the blue LED is not working, everything will look yellow-ish (i.e. red + green).

I don't know whether the most common LED failure is red, but I've seen mention of blue being replaced a few...
Forum: Rear Projection Units   08-17-2014, 11:25 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Could be. Two things to try: 1) a different hdmi...

Could be. Two things to try: 1) a different hdmi cable, and 2) connect to a different hdmi port on the TV.
Take off the back and vacuum out the dust, especially open the shell over the LED...
Forum: Rear Projection Units   08-16-2014, 02:51 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
I think you have to remove the printed circuit...

I think you have to remove the printed circuit board from the metal shell, and then take the DLP chip out of its socket.

I'm too lazy to actually look up the procedure in the service manual.
Forum: Rear Projection Units   08-10-2014, 08:00 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Adjust the centering: ...

Adjust the centering:
http://www.avsforum.com/forum/63-rear-projection-units/1029686-2008-samsung-hl61a750-led-dlp-owners-thread-faq-520.html#post24303896
Forum: Rear Projection Units   08-02-2014, 04:30 PM
Replies: 10,897
Views: 1,337,034
Posted By cosmicvoid
When PC connected to HDMI input, does the PC...

When PC connected to HDMI input, does the PC video setup recognize the TV as a display device? Do you have a separate monitor for the PC that works so you can do the video display setup? Is the PC...
Forum: Rear Projection Units   07-18-2014, 07:01 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
The only replaceable board for this problem is...

The only replaceable board for this problem is the "main board", BP94-02326A or BP96-02089A. I suppose there is a vanishingly small chance that the speakers or wiring could be intermittent.
Forum: Rear Projection Units   07-15-2014, 07:59 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
I'm assuming you're using the internal speakers....

I'm assuming you're using the internal speakers. The audio circuitry is all on the 'main board', so if there's a problem, that's where it would be. Have you tried taking the audio out, either the...
Forum: Rear Projection Units   07-07-2014, 07:55 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
That would be my first guess.

That would be my first guess.
Forum: Rear Projection Units   07-01-2014, 12:34 AM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Then light must be leaking from the light path...

Then light must be leaking from the light path somewhere, or there is dust/dirt/smudge on the optics which is scattering light.

If you open one of the side ports in the back shell and look in at...
Forum: Rear Projection Units   06-29-2014, 08:20 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
This looks suspiciously like the effect that...

This looks suspiciously like the effect that happens when external light shines into the screen. This is noticable even with the set turned off. Have you changed your room lighting lately?
Forum: Rear Projection Units   06-26-2014, 02:42 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
After 6 years, I doubt there would be any free...

After 6 years, I doubt there would be any free service for this set.

What you might do, if you are inclined, is take the heat sink off the back of the DMD and clean the DMD back and the heat sink,...
Forum: Rear Projection Units   06-24-2014, 07:18 PM
Replies: 10,897
Views: 1,337,034
Posted By cosmicvoid
Perhaps the new bulbs are drawing too much...

Perhaps the new bulbs are drawing too much current, and the ballast/supply is overheating, causing the reboot.

You should try finding bulbs from a different source to see if they behave better.
Forum: Rear Projection Units   06-21-2014, 12:13 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
There is a link to a source for the service...

There is a link to a source for the service manual here:
http://www.avsforum.com/forum/63-rear-projection-units/1029686-2008-samsung-hl61a750-led-dlp-owners-thread-faq-522.html#post24723895

The...
Forum: Rear Projection Units   06-20-2014, 03:33 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
I decided that for my set, the next easiest thing...

I decided that for my set, the next easiest thing to try is the 'color sensor' board, so I ordered one on ebay last week (for $18), and received it a couple days ago. I'll try replacing that in the...
Forum: Rear Projection Units   06-17-2014, 10:44 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Have you looked at the Lee Bailey service menu...

Have you looked at the Lee Bailey service menu threads?

http://www.avsforum.com/forum/63-rear-projection-units/1029686-2008-samsung-hl61a750-led-dlp-owners-thread-faq.html#post13874256
Forum: Rear Projection Units   06-16-2014, 11:32 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Your tip about using nitrile gloves is an...

Your tip about using nitrile gloves is an excellent idea.

Canned air is best; mechanically compressed air can have water and oil vapor in it. Bad for optics.
Forum: Rear Projection Units   06-08-2014, 10:52 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
FYI, a few months ago, I picked up a used...

FYI, a few months ago, I picked up a used HL67A750 (same set that I have) that had "no picture", and I figured I'd see if I could fix it. The previous owner had replaced the sub-SMPS (which had a...
Forum: Rear Projection Units   06-07-2014, 10:03 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Quote:Originally Posted by...

Quote:Originally Posted by Piratefan http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1029686/2008-samsung-hl61a750-led-dlp-owners-thread-and-faq/15660#post_24804622)

......
Forum: Rear Projection Units   06-07-2014, 05:07 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Quote:Originally Posted by...

Quote:Originally Posted by Piratefan http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1029686/2008-samsung-hl61a750-led-dlp-owners-thread-and-faq/15660#post_24803827)
...
Forum: Rear Projection Units   05-26-2014, 12:46 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Quote:Originally Posted by...

Quote:Originally Posted by Piratefan http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1029686/2008-samsung-hl61a750-led-dlp-owners-thread-and-faq/15660#post_24759842)

......
Forum: Rear Projection Units   05-25-2014, 11:05 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Quote:Originally Posted by...

Quote:Originally Posted by remerbt http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1029686/2008-samsung-hl61a750-led-dlp-owners-thread-and-faq/15660#post_24759714)

......
Forum: Rear Projection Units   05-25-2014, 09:01 PM
Replies: 15,741
Views: 1,905,431
Posted By cosmicvoid
Quote:Originally Posted by...

Quote:Originally Posted by Piratefan http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1029686/2008-samsung-hl61a750-led-dlp-owners-thread-and-faq/15660#post_24757768)

......
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