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#21 |
Badcaps Veteran
Join Date: Apr 2010
City & State: Canada
Posts: 9,177
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![]() Part 3
Misc suggestions 1) Post clear focused pictures in the following format. Please DO NOT post pictures inline as they slow down the loading of pages. For best picture quality and clarity take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focused pictures. Try to get a photo that is 2000x2000 resolution and less than 2MB or as close as possible. Here is an example of the picture composition we want. http://www.badcaps.net/forum/showpos...94&postcount=1 2) Use clear coherent language with grammar and punctuation. If you can't articulate your problem, no one can or will help you. 3) Make an effort and do some research before posting. 4) If you are new, please read the FAQs before posting. You are more likely to get help if you do. 5) Post MORE information that little. A post that says "MY MONITOR DOES NOT WORK. HELP ME" is likely to be ignored. The more information you give, the better. Changes in revision 0.3 1) added another test for bad CCFLs 2) added an example of poor soldering causing "2 seconds to black" 3) added tutorial link for replacing CCFL 4) added explanation on why bad caps cause "2 seconds to black" 5) added section on bad CCFL wiring with pictures 6) added more links to pictures and case studies 7) added procedure on how to choose replacement caps 8) corrected some grammar 9) removed dead links
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--- begin sig file --- If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post. We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings. Please do not post inline and offsite as they slow down the loading of pages. --- end sig file --- Last edited by retiredcaps; 12-17-2011 at 01:01 AM.. |
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#22 |
New Member
Join Date: Aug 2011
Posts: 15
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![]() "and plug in spare CCFL"...
a)Most panels contain a spare CCFL. (?) b)Many panels contain a spare CCFL. (?) c)Panels occaisionally have a spare CCFL. (?) d)Panels rarely contain a spare CCFL. (?) Please clarify in the guide which of the above statements most closely reflects current manufacturing practice. (If there are brands which pretty much always provide spare CCFL, maybe identify them down in the thread - they're the ones I'd be keeping an eye out for! I'm surprised any manufacturer provides spare anything inside electronic equipment.) Last edited by buyerninety; 06-25-2012 at 12:52 AM.. Reason: precision in grammar |
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#23 |
New Member
Join Date: Aug 2011
Posts: 15
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![]() "and plug in spare CCFL"...
a)Most panels contain a spare CCFL? b)Many panels contain a spare CCFL? c)Panels occaisionally have a spare CCFL? d)Panels rarely contain a spare CCFL? Please clarify in the guide which of the above statements most closely reflects current manufacturing practice. (If there are brands which pretty much always provide spare CCFL, maybe identify them down in the thread - they're the ones I'd be keeping an eye out for! I'm surprised any manufacturer provides spare anything inside electronic equipment.) |
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#24 |
Badcaps Veteran
Join Date: Jul 2010
City & State: Harrogate UK
Posts: 1,087
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![]() d) Have never seen a Spare ccfl ::Having not read the Post suggest it may have meant TEST CCFL.
Last edited by Rtech; 06-25-2012 at 02:06 AM.. |
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#25 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,102
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![]() "The CCFLs light up the panel and they can be bad due to age, bad solder, bad connection or a variety of reasons. The easiest way to test for bad CCFLs is to have a least one other CCFL.
Let's assume that you have a LCD with 4 CCFLs (numbered 1 to 4) and a spare." He meant that you should have aknown good spare lamp for testing such as one you removed from the LCD panel that has cracked screen but still have good lamps. For people that does not have spare lamps for testing, you can use this: http://www.badcaps.net/forum/showthread.php?t=19987 I myself keep a lot of spare lamp assemblies from broken LCD screen assemblies. http://s807.photobucket.com/albums/y...klight%20lamp/
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Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 |
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#26 |
Retired Tech
Join Date: Jun 2012
City & State: Newport, OR
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 2,307
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![]() Will the idea work in reverse, i.e. the ckt from a CFL to test a CCFL tube? I have a CFL with broken glass. It was broken when I moved into this place and I'm sure the mercury has long since dispersed so no worries there.
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#27 |
New Member
Join Date: Aug 2011
Posts: 15
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![]() i.e.; 'using a spare CCFL previously obtained.'
AAhh, I understand. Another suggestion; On this webpage; http://pkrobot.freehostia.com/LCDRepair9.htm the guy took apart an LCD ( HP VS19 ) and found that he had forgotten to record how all the diffuser screens were meant to be reorientated for reassembly. These 'diffuser screens' (is there a better word for them?) could be mentioned e.g.; DISASSEMBLY ===== Behind the LCD screen there may be multiple 'diffuser screens' which diffuse the LCD panels light evenly - take careful note of their orientations, so you know the order to put them back in during reassembly. >or maybe 'take careful note of their orientations, so they can be correctly reassembled.' >Also in Safety, maybe add wording like this?; SAFETY ===== Most of the tests below require a multimeter, but all the ones that I write about are with power OFF and unplugged and with sufficient time having passed for any stored voltages (e.g. in the capacitors) to have dissipated. The CCFL test does not require a multimeter, but there is VERY HIGH VOLTAGE (600V to 1000V). |
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#28 |
New Member
Join Date: Aug 2011
Posts: 15
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![]() It's my understanding, SteveNielsen, that a Tube contains in gas form,
inert gases such as Argon -> but the Mercury is mainly in the 'powder' that coats the interior tube wall and is present in a loose minute quantity. That powder can still be dislodged from the walls - therefore it's still a health hazard(!), also if disposed off in normal trash collection where it can leach from the dump down into the water table (eventually). |
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#29 |
Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,102
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![]() "The inner surface of the lamp is coated with a fluorescent (and often slightly phosphorescent) coating made of varying blends of metallic and rare-earth phosphor salts"
http://en.wikipedia.org/wiki/Fluorescent_lamp |
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#30 | |
New Member
Join Date: Sep 2012
City & State: chilliwack bc
My Country: canada
I'm a: Knowledge Seeker
Posts: 1
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![]() Quote:
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#31 |
Member
Join Date: Aug 2012
City & State: naples
My Country: italy
I'm a: Knowledge Seeker
Posts: 51
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![]() Retiredcaps Thanks for this very interesting guide pier.
slowly and the translator will read and I will study. |
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#32 |
New Member
Join Date: Jan 2013
City & State: Montreal, Qc
My Country: Canada
I'm a: Knowledge Seeker
Posts: 1
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![]() Hi Budm, do you know if I can use a 17" CCFL as spare test unit to test a 19" inch inverter board ?
I would say yes but I'm knew in LCD Troubleshooting. Thanks in advance |
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#33 |
Badcaps Veteran
Join Date: Jul 2010
City & State: Harrogate UK
Posts: 1,087
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#34 |
New Member
Join Date: Jul 2011
Posts: 7
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![]() tnx help a lot.
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#35 | ||
New Member
Join Date: Jan 2013
City & State: brindisi
My Country: Italy
I'm a: Knowledge Seeker
Posts: 16
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![]() I am afraid there is some no coherent information about mosfet testing
Quote:
a) black on pin S- red on pin D - record ohms b) black on pin S- red on pin G - record ohms c) black on pin D- red on pin G - record ohms Below it is written: Quote:
I would say the correct is the first one, but I am a beginner here ![]() |
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#36 |
New Member
Join Date: Aug 2013
City & State: Bev Hill, Cali
My Country: USA
I'm a: Knowledge Seeker
Posts: 5
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#37 |
New Member
Join Date: Aug 2013
City & State: Bev Hill, Cali
My Country: USA
I'm a: Knowledge Seeker
Posts: 5
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![]() ^^^^^ I mean transformer
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#38 |
Badcaps Veteran
Join Date: Jul 2006
City & State: Curitiba
My Country: Brazil
Line Voltage: 127VAC 60Hz
I'm a: Knowledge Seeker
Posts: 233
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![]() Those two equal things, near the center of the power board. Please , post better pictures of it. ( It´s the beige one, as opposed to the two green ones ) .
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#39 |
New Member
Join Date: Sep 2013
City & State: NANTES
My Country: Brésil
I'm a: Knowledge Seeker
Posts: 7
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![]() Hello, It appears that I have two Shorted Transistors.
Transistors C5706 How can I know how to choose the right reference to replace these shorted transistors ? Thanks |
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#40 |
New Member
Join Date: Sep 2013
City & State: NANTES
My Country: Brésil
I'm a: Knowledge Seeker
Posts: 7
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![]() Personne ? :/
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