Old LCD Problems

Ta10n · 07-03-06, 11:47 AM

Hey guys, I'm having a problem with an old LCD monitor I have. After a move it stopped working. When I went to plug it in it smoked and made a big silicone stink. After disassembly I noticed that it had no burn marks AT ALL! No
capacitors were blown etc. My thought is that the power connector that takes power from the outside and runs it through the LCD's main PCB could be toast. That would explain why after plugging it in again there was no smoke and no sign of power to the LCD. Any thoughts? Thanks.

JimmyG · 07-04-06, 09:51 AM

Unless you're an electronics technician or engineer and have a lot of time on your hands, don't bother to fix it. It will take more time and money than to buy a replacement. When it smokes, it is usually something serious.

Ta10n · 07-04-06, 08:19 PM

I figured as much. I just wish someone knew what was wrong with it. I'd especially like to know if the backlight just burned out, because if thats it than I
can turn the monitor into a projector.

JimmyG · 07-05-06, 06:04 PM

Smoke is always a bad sign. I suspect that trying to do anything with it will be more trouble and money than it's worth. But, if you just want to putz around, get out your screwdriver and knock yourself out!

Ta10n · 07-05-06, 06:45 PM

It's to bad the suspect part is soldered to the PCB (I think). I did disassemble the monitor though and it was quite the learning experience

JimmyG · 07-06-06, 09:05 AM

Well, you have gone this far, don't give up. See if you can find a replacement part. You can find electronic parts here: http://www.allelectronics.com/index.html and here: http://www.electronicsic.com/

There are lots of other places. Just Google it.

Ta10n · 07-06-06, 09:39 AM

I think I'd better figure out whats broken before I go shopping for replacement parts

Mr. Roboto · 07-07-06, 01:26 AM

Check the power inverters for the backlights, those can be known to smoke up when they die. If it was the actual CCFL, it wouldn't smoke, unless it was shorted.

four4875 · 07-07-06, 01:30 AM

you see any chips with like white spots on the middle of them? also, follow your nose and try to find the area the smell comin from, and look there.

Ta10n · 07-07-06, 07:53 AM

Good suggestions! I haven't checked either of those things yet. Mr. Roboto if it was the inverters how would I go about replacing them?

Mr. Roboto · 07-08-06, 12:16 AM

You can get them in those cold cathode kits people use to light up their cases. I've used one of those to replace a bad one once, so i know they work. I'm not sure if you can buy just the inverter though.

I actually used a cold cathode to replace a burtn backlight in a LCD once too, so if it is th ebacklight too, then you can get white cold cathodes to fix them.

Ta10n · 07-08-06, 10:03 AM

Cool that would be an easy fix.

four4875 · 07-08-06, 10:13 AM

http://www.allelectronics.com/cgi-bi...FT_LAMPS_.html

an inverter.

i would think that if it were an inverter / backlight problem, the display would still power on with led, and if you shine a bright flashlight on the screen or even in good sunlight, you can see theres stuff on the screen. when the switch in my laptop's lid to turn the backlight off when closed went bad, i could still see the stuff on the screen when i had it in direct sunlight, the kind that makes it a bitch to read. i'd try followin where the power goes from the plug on the board, follow the traces and hope its somethin like a protection diode right by the plug.

JimmyG · 07-08-06, 03:17 PM

Check to see if there are any fuses soldered to the printed circuit board. You may have to replace one before anything will work.

Ta10n · 07-10-06, 08:12 AM

Quote:

Originally Posted by JimmyG

Check to see if there are any fuses soldered to the printed circuit board. You may have to replace one before anything will work.

Okay, what do the fuses look like?

JimmyG · 07-11-06, 11:37 AM

They look like small tubes that are soldered on both ends. They frequently have clear plastic casing. Inside you can see a fine wire. If the wire is broken, then the fuse is blown. Fuses can also be installed in a bracket without being soldered to the board.

Ta10n · 07-11-06, 12:49 PM

Quote:

Originally Posted by JimmyG

They look like small tubes that are soldered on both ends. They frequently have clear plastic casing. Inside you can see a fine wire. If the wire is broken, then the fuse is blown. Fuses can also be installed in a bracket without being soldered to the board.

Cool. I guess I'll take the monitor apart in a little while then!

David · 07-11-06, 05:37 PM

Moved from General Hardware.

07-03-06, 11:47 AM	Thread Starter #1
Ta10n Registered Join Date: Apr 2006	Old LCD Problems Hey guys, I'm having a problem with an old LCD monitor I have. After a move it stopped working. When I went to plug it in it smoked and made a big silicone stink. After disassembly I noticed that it had no burn marks AT ALL! No capacitors were blown etc. My thought is that the power connector that takes power from the outside and runs it through the LCD's main PCB could be toast. That would explain why after plugging it in again there was no smoke and no sign of power to the LCD. Any thoughts? Thanks.
	QUOTE Thanks

07-04-06, 09:51 AM	#2
JimmyG Member Join Date: Apr 2001 Location: Michigan	Unless you're an electronics technician or engineer and have a lot of time on your hands, don't bother to fix it. It will take more time and money than to buy a replacement. When it smokes, it is usually something serious. __________________ Main Computer: INTEL 2600K; ASUS P8Z68 Deluxe; 850W Corsair; Antec P280 case;16 Gigs Corsair Vengance;EVGA 560 TI; 120 INTEL SSD; 2x500Gig WD HD; op system: Win 7-64; Backup computer:INTEL Q6600; 650W Corsair in Antec P180 Case; 4 Gigs RAM; EVGA GT430; Gigibyte P45T-ES3G mobo; 1x200 GB WD; 2x160 GB WD; 1x1GB WD. Operating system: Win 7 -64. *Avatar by Gresyth*
	QUOTE Thanks

07-04-06, 08:19 PM	Thread Starter #3
Ta10n Registered Join Date: Apr 2006	I figured as much. I just wish someone knew what was wrong with it. I'd especially like to know if the backlight just burned out, because if thats it than I can turn the monitor into a projector.
	QUOTE Thanks

07-05-06, 06:04 PM	#4
JimmyG Member Join Date: Apr 2001 Location: Michigan	Smoke is always a bad sign. I suspect that trying to do anything with it will be more trouble and money than it's worth. But, if you just want to putz around, get out your screwdriver and knock yourself out! __________________ Main Computer: INTEL 2600K; ASUS P8Z68 Deluxe; 850W Corsair; Antec P280 case;16 Gigs Corsair Vengance;EVGA 560 TI; 120 INTEL SSD; 2x500Gig WD HD; op system: Win 7-64; Backup computer:INTEL Q6600; 650W Corsair in Antec P180 Case; 4 Gigs RAM; EVGA GT430; Gigibyte P45T-ES3G mobo; 1x200 GB WD; 2x160 GB WD; 1x1GB WD. Operating system: Win 7 -64. *Avatar by Gresyth*
	QUOTE Thanks

07-05-06, 06:45 PM	Thread Starter #5
Ta10n Registered Join Date: Apr 2006	It's to bad the suspect part is soldered to the PCB (I think). I did disassemble the monitor though and it was quite the learning experience
	QUOTE Thanks

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07-06-06, 09:05 AM	#6
JimmyG Member Join Date: Apr 2001 Location: Michigan	Well, you have gone this far, don't give up. See if you can find a replacement part. You can find electronic parts here: http://www.allelectronics.com/index.html and here: http://www.electronicsic.com/ There are lots of other places. Just Google it. __________________ Main Computer: INTEL 2600K; ASUS P8Z68 Deluxe; 850W Corsair; Antec P280 case;16 Gigs Corsair Vengance;EVGA 560 TI; 120 INTEL SSD; 2x500Gig WD HD; op system: Win 7-64; Backup computer:INTEL Q6600; 650W Corsair in Antec P180 Case; 4 Gigs RAM; EVGA GT430; Gigibyte P45T-ES3G mobo; 1x200 GB WD; 2x160 GB WD; 1x1GB WD. Operating system: Win 7 -64. *Avatar by Gresyth*
	QUOTE Thanks

07-06-06, 09:39 AM	Thread Starter #7
Ta10n Registered Join Date: Apr 2006	I think I'd better figure out whats broken before I go shopping for replacement parts
	QUOTE Thanks

07-07-06, 01:26 AM	#8
Mr. Roboto Member Join Date: Dec 2005 Location: Boston, MA	Check the power inverters for the backlights, those can be known to smoke up when they die. If it was the actual CCFL, it wouldn't smoke, unless it was shorted. __________________ Main Rig: e8400 l ASUS P5K Deluxe l G.Skill 4GB HZ's l GTX 280 l 2x320gb 7200.10 Raid 0 l X-FI Platinum l CM Stacker 830 l OCZ 700W GameXtreme l Logitech z-5500's l G5 l Saitek Eclipse II l 2 x 2407 WFP HTPC:P4 2.8 l 1.5GB ram l 7600GS l HVR-1600 l 400gb raid 0 l Audigy 1 l Coolermaster 280 l 37" Olevia Heat
	QUOTE Thanks

07-07-06, 01:30 AM	#9
four4875 Member Join Date: Jan 2003 Location: I can see walmart, 44906	you see any chips with like white spots on the middle of them? also, follow your nose and try to find the area the smell comin from, and look there. __________________ Student of Electronic Engineering as of September 20, 2010
	QUOTE Thanks

07-07-06, 07:53 AM	Thread Starter #10
Ta10n Registered Join Date: Apr 2006	Good suggestions! I haven't checked either of those things yet. Mr. Roboto if it was the inverters how would I go about replacing them?
	QUOTE Thanks

07-08-06, 12:16 AM	#11
Mr. Roboto Member Join Date: Dec 2005 Location: Boston, MA	You can get them in those cold cathode kits people use to light up their cases. I've used one of those to replace a bad one once, so i know they work. I'm not sure if you can buy just the inverter though. I actually used a cold cathode to replace a burtn backlight in a LCD once too, so if it is th ebacklight too, then you can get white cold cathodes to fix them. __________________ Main Rig: e8400 l ASUS P5K Deluxe l G.Skill 4GB HZ's l GTX 280 l 2x320gb 7200.10 Raid 0 l X-FI Platinum l CM Stacker 830 l OCZ 700W GameXtreme l Logitech z-5500's l G5 l Saitek Eclipse II l 2 x 2407 WFP HTPC:P4 2.8 l 1.5GB ram l 7600GS l HVR-1600 l 400gb raid 0 l Audigy 1 l Coolermaster 280 l 37" Olevia Heat
	QUOTE Thanks

07-08-06, 10:03 AM	Thread Starter #12
Ta10n Registered Join Date: Apr 2006	Cool that would be an easy fix.
	QUOTE Thanks

07-08-06, 10:13 AM	#13
four4875 Member Join Date: Jan 2003 Location: I can see walmart, 44906	http://www.allelectronics.com/cgi-bi...FT_LAMPS_.html an inverter. i would think that if it were an inverter / backlight problem, the display would still power on with led, and if you shine a bright flashlight on the screen or even in good sunlight, you can see theres stuff on the screen. when the switch in my laptop's lid to turn the backlight off when closed went bad, i could still see the stuff on the screen when i had it in direct sunlight, the kind that makes it a bitch to read. i'd try followin where the power goes from the plug on the board, follow the traces and hope its somethin like a protection diode right by the plug. __________________ Student of Electronic Engineering as of September 20, 2010
	QUOTE Thanks

07-08-06, 03:17 PM	#14
JimmyG Member Join Date: Apr 2001 Location: Michigan	Check to see if there are any fuses soldered to the printed circuit board. You may have to replace one before anything will work. __________________ Main Computer: INTEL 2600K; ASUS P8Z68 Deluxe; 850W Corsair; Antec P280 case;16 Gigs Corsair Vengance;EVGA 560 TI; 120 INTEL SSD; 2x500Gig WD HD; op system: Win 7-64; Backup computer:INTEL Q6600; 650W Corsair in Antec P180 Case; 4 Gigs RAM; EVGA GT430; Gigibyte P45T-ES3G mobo; 1x200 GB WD; 2x160 GB WD; 1x1GB WD. Operating system: Win 7 -64. *Avatar by Gresyth*
	QUOTE Thanks

07-11-06, 11:37 AM	#16
JimmyG Member Join Date: Apr 2001 Location: Michigan	They look like small tubes that are soldered on both ends. They frequently have clear plastic casing. Inside you can see a fine wire. If the wire is broken, then the fuse is blown. Fuses can also be installed in a bracket without being soldered to the board. __________________ Main Computer: INTEL 2600K; ASUS P8Z68 Deluxe; 850W Corsair; Antec P280 case;16 Gigs Corsair Vengance;EVGA 560 TI; 120 INTEL SSD; 2x500Gig WD HD; op system: Win 7-64; Backup computer:INTEL Q6600; 650W Corsair in Antec P180 Case; 4 Gigs RAM; EVGA GT430; Gigibyte P45T-ES3G mobo; 1x200 GB WD; 2x160 GB WD; 1x1GB WD. Operating system: Win 7 -64. *Avatar by Gresyth*
	QUOTE Thanks

07-11-06, 05:37 PM	#18
David Forums Super Moderator Overclockers.com Lead Editor Join Date: Feb 2001 Location: Hiding from Americans and making pretty colours in a drybox in St Andrews	Moved from General Hardware. __________________ David J. Nelson MChem(Edin) PhD(Strath) AMRSC [Academia Profile] OC Forums Super Moderator // Overclockers.com Editor The Workhorse: [Lenovo W510] Intel Core i7-720QM / 8 GB DDR3 / nVidia Quadro FX880M / Crucial M4 256 GB SSD / Windows 7 The HTPC/Server: AMD Phenom X4 9650 / 6 GB DDR2 / nVidia 8300 / 5 TB of HDDs / Antec Solo II Case / Windows 7 The Gaming Rig: AMD Llano A6-3650 / 4 GB DDR3 / nVidia GTX260 / 2x 500 GB HDD in RAID0 / Antec Dark Fleet DF-85 Case / Windows 7 The Benchmarking Setup: Various LGA775 chips / Asus Rampage Formula / 2 GB OCZ 1066 MHz DDR2 / nVidia Quadro NVS 285 / 320 GB HDD / Windows 7 My research fellowship is eating all my time, so I may be slow to reply to emails and private messages.
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