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Search: Posts Made By: cosmicvoid
Forum: Rear Projection Units   09-01-2015, 10:15 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Hmm, maybe so. Now the driver module becomes...

Hmm, maybe so. Now the driver module becomes suspect, but 'no smoking gun'. I can't help but wonder if things have been stressed by overheating; i.e. is there a lot of dust inside that reduces the...
Forum: Rear Projection Units   09-01-2015, 07:05 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Its not very likely the driver would damage the...

Its not very likely the driver would damage the LED, but I suppose its not impossible. If you disconnect the 2-wire heavy cable (blue/white) and test the LED with a 9V battery, and it lights up, then...
Forum: Rear Projection Units   08-31-2015, 09:57 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
That doesn't make sense. If the blue LED died,...

That doesn't make sense. If the blue LED died, the screen would have a yellow tint. The only way a green tint would happen is if both the red and blue LEDs died. If the red LED died, the screen would...
Forum: Rear Projection Units   08-26-2015, 09:45 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
If you verify no 16V output, it doesn't much...

If you verify no 16V output, it doesn't much matter what the reason is.
You can find links to sellers by searching Google for "samsung BP96-01726B". Skip the ones higher than mid-$50.
...
Forum: Rear Projection Units   08-25-2015, 10:15 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Just to double check, are you sure the DMM probes...

Just to double check, are you sure the DMM probes were touching the metal pins in the connector?At this point the LED driver is not a prime suspect; usually driver will fail on 1 or 2 color channels,...
Forum: Rear Projection Units   08-24-2015, 08:07 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
The manual says 220 to 400 VDC, so you are around...

The manual says 220 to 400 VDC, so you are around the low end of the range. Maybe the main smps has some marginal components too. Its best to take readings while the boards are connected, to provide...
Forum: Rear Projection Units   08-24-2015, 04:00 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Doubtful they can function normally. The...

Doubtful they can function normally. The capacitance falls way below the rated value, and the internal impedance goes way up.

Augerhandle has a good eye, to spot the bulges. I didn't even notice...
Forum: Rear Projection Units   08-23-2015, 10:55 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Looks like it will do the job. On the "V" mode,...

Looks like it will do the job. On the "V" mode, use the orange button to select VDC. It appears to be autoranging, so you shouldn't need to set a range.Yup, thats the one. I said 7 wires because...
Forum: Rear Projection Units   08-22-2015, 10:47 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Three blinking indicator leds means there is an...

Three blinking indicator leds means there is an LED problem.
Three things come to mind as reasons, in order of likelyhood:

1. the main smps (on top of the main board housing) is not outputting...
Forum: Rear Projection Units   08-15-2015, 11:38 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Those three pairs of tiny wires are for sensing...

Those three pairs of tiny wires are for sensing the temperature on each of the LEDs. They come from CN9008 on the LED driver module. That's about as much as I can find in the Service Manual and the...
Forum: Rear Projection Units   08-14-2015, 09:37 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Logically, this would point to the main board or...

Logically, this would point to the main board or the DMD board; something that happens when its cold, and disappears when it warms a little. But I have a hunch that it may be power supply related...
Forum: Rear Projection Units   08-09-2015, 08:01 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
If you were to read this thread, even the...

If you were to read this thread, even the previous few 100's of posts, you'd see that this problem is discussed ad nauseum, as its a common problem.

The current price for the DLP chip is a little...
Forum: Rear Projection Units   08-08-2015, 08:20 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Swell ?? :rolleyes:. There is no point in giving...

Swell ?? :rolleyes:. There is no point in giving site links, as the parts go in and out of stock on all of the sites. What you really should have is the list of Samsung part #'s for the parts...
Forum: Rear Projection Units   08-07-2015, 01:10 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Seems like a main-board problem on HDMI1, but...

Seems like a main-board problem on HDMI1, but you'd need to do more experiments to be sure.The Samsung manual says this:
I think that setting the HDMI3 name to "PC" does something to adjust the...
Forum: Rear Projection Units   08-06-2015, 11:22 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Not really, unless something is overheating and...

Not really, unless something is overheating and causing a problem. What you are doing is buying time until something fails. Heat is the biggest cause of trouble, and dust reduces cooling.Looking...
Forum: Rear Projection Units   08-06-2015, 08:48 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
So its indeterminate, and not a repeatable fault...

So its indeterminate, and not a repeatable fault of the TV. IF it was a signal path fault within the TV, it would likely be on the main-board, or less likely on the DMD board. Just a first off...
Forum: Rear Projection Units   08-06-2015, 12:27 AM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
I have not experienced (or read about) this...

I have not experienced (or read about) this problem, but I can offer my ideas.

What is the source of the Netflix feed, and have you eliminated that device as the possible source of the signal...
Forum: Rear Projection Units   07-25-2015, 10:23 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
I don't see how a DMD replacement can be related...

I don't see how a DMD replacement can be related to intermittent signal on HDMI (3 presumably). I'd suspect, in this order:
a) a loose cable connection from PC to TV
b) a flaky HDMI cable
c)...
Forum: Rear Projection Units   07-20-2015, 08:25 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Ahh, well I'd be surprised if the 300V is even...

Ahh, well I'd be surprised if the 300V is even referenced to ground.
I see some BP96-01726B for $56, some for a lot more. That still leaves the old caps on the main-smps ticking their lives away,...
Forum: Rear Projection Units   07-20-2015, 06:57 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Explain what you mean about CN800 being...

Explain what you mean about CN800 being "constant", but varying up/down by 149V.

It could be the sub-smps failing, but just as well it could be the main-smps. If the 300V folded back under load...
Forum: Rear Projection Units   07-12-2015, 10:11 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
I tried the original Darbee Darblet several years...

I tried the original Darbee Darblet several years ago on my 67A750. The enhancement was good, almost amazing, and I would have liked to keep the unit. However, there was a dealbreaker, in that each...
Forum: Rear Projection Units   06-22-2015, 10:26 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
Yeah, as electronic devices age, the electrolytic...

Yeah, as electronic devices age, the electrolytic caps tend to go bad (become high impedance) and the output voltage will fold back. Relatively inexpensive to replace the caps, if you're trying to...
Forum: Rear Projection Units   06-13-2015, 11:17 PM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
You could take a look at this thread: ...

You could take a look at this thread:

http://www.avsforum.com/forum/63-rear-projection-units/1134887-official-2008-samsung-hl61a750-hl67a750-led-dlp-settings-calibration-thread.html
Forum: Rear Projection Units   05-14-2015, 01:41 AM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
I can't offer advice on the gray shadow, as I...

I can't offer advice on the gray shadow, as I don't know the root cause. I've seen it mentioned on this thread, but don't remember the cure.

As for the HDMI input issue, that would be on the...
Forum: Rear Projection Units   01-20-2015, 12:23 AM
Replies: 16,064
Views: 1,951,066
Posted By cosmicvoid
If you score a replacement mainbrd, remember to...

If you score a replacement mainbrd, remember to keep the color mapping data in sync with the DMD boaard. You go into service mode and copy DMD -> Main, replacing the unknown values in the mainbrd...
Showing results 1 to 25 of 433

 
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