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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Samsung DLP tv HLM617W color wheel
Doesn't the color wheel get sync'd up with the scan?
If so any failure in the sync would affect the motor on the color wheel, wouldn't it? |
#2
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Samsung DLP tv HLM617W color wheel
Hi. Got a Samsung HLM617W dlp set here. Runs good for 10 minutes or so, then
picture begins breaking up, with a corresponding uneven sound from color wheel motor housing. I reckon color wheel motor is the problem, but figured to see if any of you guys have had similar issues with this model before. Samsung parts place says they sell many of the color wheels. Sound right? Just trying to be sure before I order parts, and it is possible it could be mirror chip. All fans are good and running. Bulb is strong and not flickering. It affects all parts of picture, including menu. Danny |
#3
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Samsung DLP tv HLM617W color wheel
I don't mean the scan, but the sync pulses from the control sending the
different color information to the dlp. I was thinking the scan as it relates to scanning between red, green, and blue. FYI color wheel motors do commonly have problems, but I have seen control problems exhibit similar issues. |
#4
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Samsung DLP tv HLM617W color wheel
" writes:
I don't mean the scan, but the sync pulses from the control sending the different color information to the dlp. I was thinking the scan as it relates to scanning between red, green, and blue. FYI color wheel motors do commonly have problems, but I have seen control problems exhibit similar issues. The color wheel and DLP/DMD chip are slaves to the incoming sync. So, yes, could be the motor but could also be a video/sync issue. It's not likely the DMD chip itself. If you can locate the sync pulses driving the color wheel servo, start there. If the motor isn't expensive, then, sure, try a replacement or swap one in from another unit. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#5
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Samsung DLP tv HLM617W color wheel
Normally, if you hear the Colour Wheel screaming, sounding like a small buzz
saw at times, then it is time to replace it. Rarely the DMD assembly will cause problems if signals to the Colour Wheel become distorted. Excessive dirt within the sets, dust buildup around the fans and ingressing into the housing of the colour wheel also will contribute to the problems. Normally you will hear the Colour Wheel spin up when the set is powered up, then most of the mechanical noises are produced by the cooling fans. "Sam Goldwasser" wrote in message ... " writes: I don't mean the scan, but the sync pulses from the control sending the different color information to the dlp. I was thinking the scan as it relates to scanning between red, green, and blue. FYI color wheel motors do commonly have problems, but I have seen control problems exhibit similar issues. The color wheel and DLP/DMD chip are slaves to the incoming sync. So, yes, could be the motor but could also be a video/sync issue. It's not likely the DMD chip itself. If you can locate the sync pulses driving the color wheel servo, start there. If the motor isn't expensive, then, sure, try a replacement or swap one in from another unit. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#6
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Samsung DLP tv HLM617W color wheel
Disabling the Colour wheel and/or taking it out of the light path will
probably ender the flippin thing inoperable. wrote in message ... What I was going to try and do is this -- get the color wheel out of the way of the light path and see if set runs stable as a black and white. I know the high speed of this wheel, near 11000 rpm, will require great care in this plan. Samsung gets like 130 for the wheel motor. Lady has had no end of trouble with set and Samsung will no longer warranty it, therefore I have it to look into. Other than 2 bulbs and a new ballast I don't know what else has been done to it. She wants a firm estimate of repairs, so she can decide then. In other words, I must be dead on before I spends her money. Perhaps set will run with color wheel unpluged and out of the way. I should then be able to tell if it is a sync or mechanical problem with color wheel moved, at any rate. Danny |
#7
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Samsung DLP tv HLM617W color wheel
What I was going to try and do is this -- get the color wheel out of the way
of the light path and see if set runs stable as a black and white. I know the high speed of this wheel, near 11000 rpm, will require great care in this plan. Samsung gets like 130 for the wheel motor. Lady has had no end of trouble with set and Samsung will no longer warranty it, therefore I have it to look into. Other than 2 bulbs and a new ballast I don't know what else has been done to it. She wants a firm estimate of repairs, so she can decide then. In other words, I must be dead on before I spends her money. Perhaps set will run with color wheel unpluged and out of the way. I should then be able to tell if it is a sync or mechanical problem with color wheel moved, at any rate. Danny |
#8
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Samsung DLP tv HLM617W color wheel
wrote in message ... What I was going to try and do is this -- get the color wheel out of the way of the light path and see if set runs stable as a black and white. I know the high speed of this wheel, near 11000 rpm, will require great care in this plan. Samsung gets like 130 for the wheel motor. Lady has had no end of trouble with set and Samsung will no longer warranty it, therefore I have it to look into. Other than 2 bulbs and a new ballast I don't know what else has been done to it. She wants a firm estimate of repairs, so she can decide then. In other words, I must be dead on before I spends her money. Perhaps set will run with color wheel unpluged and out of the way. I should then be able to tell if it is a sync or mechanical problem with color wheel moved, at any rate. Danny No need to take it out of the way, just unplug it, the screen will be all one color but otherwise no different than it removed entirely. The unit may wait until the wheel is spun up before doing anything though. |
#9
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Samsung DLP tv HLM617W color wheel
Control circuitry senses the rotation of the Colour Wheel before allowing
lamp igniton in these devices. Disabeling the Colour Wheel or it's interconection with the DMD and control circuitry probably will result in not allowing any light, theferore display to be produced. Diagnostics normally confirm rotation of the colour wheel, hearing it spin up or visually confirming that fact if there is a failure to ignite the lamp in these sets. "James Sweet" wrote in message news:T3e2f.10260$Tn5.1755@trnddc08... wrote in message ... What I was going to try and do is this -- get the color wheel out of the way of the light path and see if set runs stable as a black and white. I know the high speed of this wheel, near 11000 rpm, will require great care in this plan. Samsung gets like 130 for the wheel motor. Lady has had no end of trouble with set and Samsung will no longer warranty it, therefore I have it to look into. Other than 2 bulbs and a new ballast I don't know what else has been done to it. She wants a firm estimate of repairs, so she can decide then. In other words, I must be dead on before I spends her money. Perhaps set will run with color wheel unpluged and out of the way. I should then be able to tell if it is a sync or mechanical problem with color wheel moved, at any rate. Danny No need to take it out of the way, just unplug it, the screen will be all one color but otherwise no different than it removed entirely. The unit may wait until the wheel is spun up before doing anything though. |
#10
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Samsung DLP tv HLM617W color wheel
Yeah, I found that out today. Demounted wheel and bolted to frame to keep it
from wandering about. It is distinctly noisy when it spins up. You are right, lamp won't come on with color wheel removed, even with cables connected. Guess I should remount properly and make sure nothing else has gone awry. These DLP sets are new to me so I am learning their ins and outs. Danny |
#11
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Samsung DLP tv HLM617W color wheel
Disregard my last post. I had forgotten to plug ballast power back in. Light
works better with electricity attached. Latest DLP experiments and results -- Samsung DLP set will run fine with color wheel mounted outside of light tunnel, and shows in black and white, but will not run if color wheel motor is unplugged. After this test, set runs and picture very jittery as before. Took color wheel out of motor mount. I then see a small infrared sensor, like used in vcrs. It had some dust on it. I cleaned away the dust, and gently dusted the wheel, but it looked clean anyway. I remounted wheel to frame and restarted -- At this point picture is perfect, in black and white. I allowed to run some hours while I did other work and errands. Stable as can be. I will remount in light tunnel tomorrow and allow to run the day. If solid, will reassemble and see how she does. Cheers, Danny |
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