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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Tue Jun 29, 2010 6:27 pm Post subject: Resistor identification question |
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I'm still going through my problem child spare HVPS and came across a large 100R resistor @ R21 on the Control PWB that had obviously been replaced (see pic). I measured it in and out of circuit and it appears to be close to infinite. ~.006R Fluke 23 Series II.
Looking at the pic, is this large (1w or 2w?) resistor a fusistor? The other 1/2w resistor is there for size comparison. That fat boy resistor is the only one on the board of that size and rating so not sure if it's supposed to be there or if that's all somebody had when they replaced it. The rest of the boards foil side is clean except for the area of this resistor which shows heavy flux buildup so I know it was replaced sometime in the not too distant past.
I tossed in a pic of the HVPS after new parts install.
BTW-I'll wait on an answer before deciding what to replace it with
Thanks guys.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Tue Jun 29, 2010 7:13 pm Post subject: |
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That's a new one on me! WTF is a color-wheel inductor? How can you tell it's one of those and not a resistor? Other than being a little chubby it sure *looks* like a resistor...
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Jun 29, 2010 7:20 pm Post subject: |
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No kidding, Gary! I had no idea, either!
So, how the hell do you tell the difference between a 100-ohm 5% resistor and a 100-microhenry 5% colorwheel inductor?
Damn, I learn something new every day!!!
SC
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Nashou66
Joined: 12 Jan 2007
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Location: West Seneca NY
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Jun 29, 2010 7:36 pm Post subject: |
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| Nashou66 wrote: | | You have to look on the PCB silk screen to know for sure. |
Yeah, obviously if the board is marked properly, you should know... I meant what if they're laying loose... So, if they were just laying around loose, there's really no way to tell the inductor from the resistor visually... You literally need a LCR meter to tell them apart.
Good to know!
SC
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Tue Jun 29, 2010 11:14 pm Post subject: |
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Thanks Nash. I tried Googling every conceivable way to find out what it is, beginning with "physical resistor sizes", "through hole resistor sizes wattage (and watts) and came up empty. I'll be damned.
Great...no schematics so no idea if the value is even correct and I'm not going to assume it takes a 100R resistor either. I have no choice now but to lower my pj and pull that HVPS out and apart to find out.
I don't think that inductor is what's preventing the ps from working tho because I had previously swapped that Control PWB into the HVPS that works and it worked. I'll find out as soon as I determine what value resistor should be there and replace it.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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Nashou66
Joined: 12 Jan 2007
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Location: West Seneca NY
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Wed Jun 30, 2010 12:55 am Post subject: |
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No prob Nash. I need to move the pj mounts back anyway so I may be able to (finally) access the ps's with little effort, so comparing is no biggie. I'm just hoping that's the problem and it fires right up. 
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jun 30, 2010 2:20 am Post subject: |
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I already asked what number supply you have for a schematic. You didn't reply
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Jun 30, 2010 2:03 pm Post subject: |
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| Nashou66 wrote: | | Thats what is called a color wheel inductor, its not a resistor. |
Of course it's not working. You put a DLP part into a CRT projector!  
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Nashou66
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1031
Joined: 22 Mar 2006
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Location: Finland
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macgyver655
Joined: 22 Aug 2007
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| Posted: Wed Jun 30, 2010 4:37 pm Post subject: |
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Ahmmm....if thats a X2394 then R21 is not 100 ohm (unless there was a change from the print). The color bans on that resistor/inductor look more correct. Greg, what exactly is that component testing to be ohm wise?
Let me correct my phrase of the color bands on that device. Are they red/black/red or brn/blk/brn or red/blk/orng
Last edited by macgyver655 on Wed Jun 30, 2010 4:53 pm; edited 1 time in total
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jun 30, 2010 4:52 pm Post subject: |
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Oh and dont beat your self up guys on never heard the term color wheel inductor. I believe that is more of a made up phrase. I've never seen it in any terminology other then Ebay which then gets linked to a few other sites by others picking up the phrase.
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Wed Jun 30, 2010 8:12 pm Post subject: |
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| macgyver655 wrote: | | I already asked what number supply you have for a schematic. You didn't reply |
Sorry bout that mac...I did post the numbers just not in this thread. My bad. 
Here's a pic of the labels, and thank you.
The colors are brn/blk/brn/gold.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
Last edited by JustGreg on Wed Jun 30, 2010 8:23 pm; edited 1 time in total
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JustGreg
Joined: 07 Mar 2006
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Location: Kenosha, WI
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| Posted: Wed Jun 30, 2010 8:14 pm Post subject: |
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| Curt Palme wrote: | | Nashou66 wrote: | | Thats what is called a color wheel inductor, its not a resistor. |
Of course it's not working. You put a DLP part into a CRT projector! |
Badum-bump-TSH!
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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JustGreg
Joined: 07 Mar 2006
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Location: Kenosha, WI
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| Posted: Wed Jun 30, 2010 8:21 pm Post subject: |
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| 1031 wrote: | | I have one HVPS controll board here. R21 is normal 100 resistor 5% tolerance. "normal" size also so 0.5W should be OK. |
Yup you are correct. As suspected (expected?) replacing it with 100R 0.05w 1% didn't bring any love. Still cycles up once, twice, then off until the power button is pressed again. rinse and repeat. Same LVPS and C light (C lights up without pressing any remote buttons) as before.
I have new poly caps for the working ps but I'm not touching it until I get the broken one working.
See chip?...I learned...finally.  I'm from a small New England town, but I wasn't their Village Idiot.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Wed Jun 30, 2010 8:27 pm Post subject: |
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| macgyver655 wrote: | Ahmmm....if thats a X2394 then R21 is not 100 ohm (unless there was a change from the print). The color bans on that resistor/inductor look more correct. Greg, what exactly is that component testing to be ohm wise?
Let me correct my phrase of the color bands on that device. Are they red/black/red or brn/blk/brn or red/blk/orng |
Mac, the colors are brn/blk/brn/gold.
I installed the 5 band 100R/0.5w/1% but no go. I 'think' I pushed an already weak IC over the edge when I reflowed it. I need to find a procedure to test them with a DMM, which is all I own.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jun 30, 2010 9:50 pm Post subject: |
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Yeah, thats the one print I dont have a complete one of. What ic are you trying to test?
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LOL 
