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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: Tue Dec 18, 2007 1:06 am Post subject: How not to repair a set. |
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I hate cutting and pasting parts of emails as examples of how not to repair a projector, but here's one...
We had troubleshot the problem down to the vertical board in a Barco. Then I got this:
Replaced the fuse with a 1A pico-fuse but it blew instantly. While measuring present voltages i accidentally touched a safety-resistor near the fuse The red led on the board went out and the set came alive producing a horizontal bright line on the blue and green tube. Pressing ADJ made the bright line appear on all 3 tubes as they lit up. I replaced the 1A fuse again but it keeps on blowing. The voltage before the fuse is 9,98V (Is this to high? The manual states +9V)What could make this fuse blow? and what made the set come alive?Can the line burn in the tubes?
2nd update
I temporary put in a 2A fuse and the image is OK. Can anyone tell me how to adjust the voltage or explane the reason for the 1A fuse to blow?
3rd update
i connected a source (DVD) and chose input nr 1 the fuse blew immediately.
Now even the 2A fuse blows. This time the unit comes alive each time i push the standby button but it displays only the bright line.
Is the problem on the deflection board only or could it be on other boards aswell?
Where should i send the board(s)?
OUCH! Now I'm guessing tube burn and more parts blown on the V board.
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Tue Dec 18, 2007 1:34 am Post subject: |
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Some people need to just leave the covers on and send it to someone that knows what they are doing. 
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Joust
Joined: 05 May 2006
Posts: 2429
Location: Almonte, Ontario, Canada
TV/Projector: Marquee 8501LC
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| Posted: Tue Dec 18, 2007 1:43 am Post subject: |
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TSK TSK
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Tue Dec 18, 2007 2:03 am Post subject: |
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Will be on ebay soon. "Looks perfect, but I don't know how to test."
Marc
_________________
This space for rent.
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jask
Joined: 17 Mar 2006
Posts: 10187
Location: kamloops BC
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| Posted: Tue Dec 18, 2007 2:23 am Post subject: |
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I think you could post the service manual for him 
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Tue Dec 18, 2007 2:37 am Post subject: |
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| jask wrote: | | I think you could post the service manual for him |
OH NO YOU DI'INT! 
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Gino
Joined: 22 Apr 2006
Posts: 1363
Location: Trinity Beach, AUSTRALIA
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| Posted: Tue Dec 18, 2007 3:21 am Post subject: |
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some just gotta learn the hard way
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( B ) ( G ) ( R ) Blendzilla Down Under ( R ) ( G ) ( B ) - Tubes of Fury
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whats6x7
Joined: 04 Oct 2006
Posts: 5924
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| Posted: Tue Dec 18, 2007 4:14 am Post subject: |
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| Tinman wrote: | Will be on ebay soon. "Looks perfect, but I don't know how to test."
Marc |
ROTFLMAO!!!!!!!!!!!!!!!!!!
_________________
it takes a village, but not just any village—and certainly not the village of Corleone on the outskirts of Palermo, Sicily!
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Fujifrontier
Joined: 20 Oct 2007
Posts: 354
Location: San Antonio, Texas
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| Posted: Tue Dec 18, 2007 4:18 am Post subject: |
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*self-censored*
Last edited by Fujifrontier on Wed Dec 19, 2007 2:04 pm; edited 1 time in total
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Tue Dec 18, 2007 2:42 pm Post subject: |
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Replace "barco" with "Ampro" and I would believe this actually happened......
_________________
Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Tue Dec 18, 2007 3:18 pm Post subject: |
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All kidding and comradarie aside... This customer may be reading this running diatribe and it may be construed as being unprofessional (we can shrug this off, of course, but Curt as a businessman can not.)
Just my 1.3 cents.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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drice1234
Joined: 07 Oct 2006
Posts: 1309
Location: Allen, Texas
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| Posted: Tue Dec 18, 2007 5:42 pm Post subject: |
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| Quote: | wtf? kill him.
if he doesn't know how tube burn is caused, he doesn't deserve a projector |
Since you are so experienced with CRT's please inform the rest of us of all of the ways that tube burn can be caused. I sure don't know and would find this information useful.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Dec 18, 2007 8:54 pm Post subject: |
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As any good tech knows, when a fuse blows you simply put in a bigger fuse. If that fuse blows then you wrap it in tin-foil. If the set catches on fire after that you list it on e-bay as "good parts machne" 
| Heywood Jablome wrote: | All kidding and comradarie aside... This customer may be reading this running diatribe and it may be construed as being unprofessional (we can shrug this off, of course, but Curt as a businessman can not.)
Just my 1.3 cents. |
I'm sure Curt didn't enjoy posting this stupid-stuff on the board. Unfortunately, sometimes people do such stupid things that it irritates you to no end. You have to post about it and vent, and hopefully prevent any more of this behavior from other people.
| drice1234 wrote: | | please inform the rest of us of all of the ways that tube burn can be caused. I sure don't know and would find this information useful. |
A tube is burned when there's a loss of deflection, either vertical or horizontal. In this case, a failure of the vertical board blew a fuse and by forcing it to come on again with no active deflection circuit present, a bright verical line was probably burned into all 3 tubes. So a $100. repair instead turned into a totally trashed machine. 
Last edited by draganm on Tue Dec 18, 2007 10:52 pm; edited 1 time in total
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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: Tue Dec 18, 2007 10:02 pm Post subject: |
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Dragan, you basically nailed it. I could read between the lines that the guy didn't want to send me the board, which is why I cut and pasted his email anonymously. I'm sure everyone else in any kind of tech industry gets the same problem over and over, and this is coming from Mr Bargain hunter himself..
It cost me many $$ to learn that at some point you send it into the professional, like my backed up sewer last year, my truck, etc. It was a late model set too, it would be a shame if the tubes got nuked. I never heard back from the guy..
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jask
Joined: 17 Mar 2006
Posts: 10187
Location: kamloops BC
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| Posted: Wed Dec 19, 2007 8:32 am Post subject: |
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And I will bet you will not, because anyone that uses that diagnosis and repair process really is not aware of what the skill and knowledge required( and consequences of rash acts) when it comes to "tinkering" with this kind of gear. as far as the original writer is concerned I hope they are reading this, it was a foolish and expensive mistake but perhaps they will benefit from the lesson. There is nothing wrong with learning to admit you are out of your league.
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