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Monitor sharp ll172a turns on then off to stand by backlights test ok no shorts to be found think might be mem chip can yo u help dave.

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Ive had this problem a few times.and it has come down to a bad memory card.or turn off pc remove memory card clean it with an eraser then replace it..it shold work..steve card may be shot period also if it doesnt work.steve

Posted on Feb 28, 2009

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Computer is on and screen goes black but the sounds and everything is still working


The monitor on this is an LCD, not an LED monitor. The symptoms you are describing are classic fluorescent backlight failure symptoms. It seems a bit early in life for that to occur, as most failure after 2-3 years of use. To determine if the backlight has failed, after booting the system, look at the screen at very close range at an angle. If you can see what looks like a ghost image of what should be on the display, then the video chip is providing video to the display, but the backlight isn't illuminating it. Repair or replace the monitor.

Jun 21, 2014 | Acer Aspire AZ1620-UR31P G530 All-In-One...

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THE 7THTHRU 12 COLUMNS ARE UNREADBLE VERTICLE CAN THIS BE FIXED OR DO I NEED A NEW ORGANIZER???? IT IS THE YO-190 256KB ORGANIZER.


The screen has lines on it? This can be fixed by replacing the screen, I don't know if parts are available, I think your best shot is to find another organizer with the same screen and replace the screen or use the other one.

seem a new one costs around 100usd
http://cgi.ebay.com/BRAND-NEW-SHARP-YO-190-256KB-MEMO-MASTER-ORGANIZER-SET!_W0QQitemZ160282250449QQcmdZViewItemQQimsxZ20080912?IMSfp=TL080912112005r33862

I think you should contact sharp for the replacement il look up the contact details.

Sep 29, 2008 | Sharp Computers & Internet

Tip

Basic LCD Monitors troubleshooting guides


By Bud Martin
First if you can, try the monitor with other PC first to make sure it is not the PC problem.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

The monitor will have at least 2 circuits boards, one board will be the logic board where the video cable from PC is attached to, the second board used in most monitors today is the Power supply/backlight inverter board combinations. Some monitors will have separate power supply module and backlight inverter board.
The monitor should be connected to the running PC otherwise it will go into standby mode.
The operations of each board:

1) The Power supply board:
It takes the 120vac 60Hz and converts it to high voltage DC (around 160~170vdc filtered by the 80~150uf 250~450vdc cap) by the bridge rectifiers to be used by the switching power supply circuits that converts this DC voltage into high frequency (around 50~100 KHz) AC for driving the step down transformer. The outputs (usually 2 outputs) of the transformer will be rectified by the diodes to produce the regulated 5vdc for the logic board, and regulated 12~20vdc (12vdc is usually for screen up to 17inch, 16~24vdc for 18~24 inch screen).

The power supply circuits are always on (unless the monitor uses the power switch that actually disconnects the power from the outlet which is rarely used these days) which means that it is running 24/7 using the monitor or not, any spikes and surge will be fed into the monitor power supply.

Common problems:
Blown fuses, bad caps (leaking/bulging tops or bottom seals, please note that bad cap may look normal but it can have high ESR (Equivalent Series Resistance). The DC filter cap should be low ESR type for using in the switching power supply; general purpose electrolytic types will not last very long in switching power supply circuits. Poor solder joints, over heated components.

Testing:
Plug the monitor in but do not activate the power switch so the backlight inverter circuits will be off. Check the 5vdc and the 12~24vdc to make sure they are OK. They should be tested with the load, you can use 6V 1A (6watts) lamp for the 5vdc, and car lamps such as 1157 (12v 8watts lo/26watts high) turn signal brake lamp using high filament connection for testing the 12~18vdc (or use two 1157 in series for 19~24vdc) for the backlight inverter circuits.
If the power supplies are working, the output voltages should be steady at the rated voltages. The power supply will go into shut down if it detects too much current draw due to false in the power supply or short circuits in the backlight inverter or in the logic board.

2) The backlight inverter circuits:
It takes the 12~24vdc and converts it to high frequency AC to drive the inverter transformers CCFL (Cold Cathode Fluorescent Lamp) assemblies. The transformers will drive the CCFL by applying the start up voltage (around 1500~2000v), when the CCFL start conducting, the voltage will drop down to about 500~800v.
The inverter has detection circuits to detect open circuit if the lamp is not attached or does not fire up after the start up voltage is applied, it will go into shut down. It will also shut down if the lamps draw too much current due to ages (when lamp gets old it will draw more current).
The inverter gets two signals from the logic board, one is the backlight ON/OFF signal, the other one is the Dimming signal for the lamps.
Common problems:
Bad filter caps, resonant caps (in the inverter output circuits), blown transistors/IC, shorted or open transformer winding.
Testing:
You should have spare lamps for testing the inverter circuits.

3) Logic board:
The logic board get the signals from the VGA (ANALOG) or DVI (DIGITAL) and processes them and feed them to the LCD panel T-CON (Timing Controller) board on the back of the LCD panel.
It also sends out two signals (backlight ON/OFF and Dimming) to the inverter circuits when the monitor is on and getting the signals from the PC.
If the logic board does not get the signal from the PC, it will put monitor into standby mode.
The 5vdc feeding it is converted to 3.3v, 1.8vdc by the switching buck converters to run the processor.
The logic board also sends the 5vd or 12vdc power for the T-CON board, if the voltage is not there, you will see white/grey glowing screen only.
Not much repair you can do on the logic board unless you have the full service manual and surface mount repair station.

4) CCFL and Inverter circuits testing:
If you don not have the inverter and lamp tester boxes you may be able to do a simple test by using these steps:
If the screen flashes on for a second, you can disconnect all the lamp connectors and connect it into one of the transformer output connector and see if you will see the flash on the screen, if you do, then try it with another transformer output connector to see if it also get the flash on the screen.
Repeat the procedure with other 3 lamps. If all the lamps do flash on for seconds then more likely the lamps are OK. If lamp only flash on one of the transformer output then you will know that the problem in that transformer inverter circuits.
If none of the lamps flash at all then the problem is in the inverter circuits, power supply, or not getting the on signal from the logic board.

Bad caps
http://i.fixya.nethttp://i.fixya.nete17e9cc.jpg

Power supply/inverter board (L), Logic bd. (R)
http://i.fixya.nethttp://i.fixya.netbc19983.jpg'

Dead T-CON bd, blown fuse. Get glowing screen only.
http://i.fixya.nethttp://i.fixya.net4fbd9e1.jpg

T-CON board's fuse F101
http://i.fixya.nethttp://i.fixya.net8506e44.jpg

Inverter board surface mounted fuses, F1 and F2

http://i.fixya.nethttp://i.fixya.net1bf6596.jpg
Bad lamps (Blackened ends, burnt /poor soldering)

http://i.fixya.nethttp://i.fixya.net5c8952e.jpg

http://i.fixya.nethttp://i.fixya.net4e5e9a1.jpg

Bad LCD panel (solid vertical lines)

http://i.fixya.nethttp://i.fixya.netffe90fe.jpg

Bad LCD panel due to bad T-CON board
http://i.fixya.nethttp://i.fixya.netef48b18.jpg
Failed TV and Monitors:
http://s807.photobucket.com/albums/yy352/budm
http://en.wikipedia.org/wiki/Capacitor_plague
Make your own test lamps: http://www.badcaps.net/forum/showthread.php?t=19987

on Sep 25, 2010 | Computers & Internet

1 Answer

My m.board is directly power on and not giving any display mother board model is via- vt82c686b


Bear with me as this will be lengthy.

You're looking at a VIA Southbridge chip.

VIA VT82C686B

http://en.wikipedia.org/wiki/List_of_VIA_chipsets#South_bridge_chips

The Northbridge chip, and Southbridge chip, make up the motherboard chipset.
(For the technology used in that motherboard)

http://en.wikipedia.org/wiki/File:Motherboard_diagram.svg

In the motherboard diagram above, CPU stands for Central Processing Unit. Another term used is Microprocessor, or simply Processor for short.

The Northbridge chip of the motherboard chipset, handles the faster processes of the computer.
The Southbridge chip handles the slower processes.

The Northbridge chip handles the Processor, Ram Memory, and high speed graphics.
High speed graphics being AGP, or PCI Express.

Not a graphics card inserted into a PCI slot, and not Integrated Graphics.

The Southbridge chip handles Integrated Graphics, or a graphics card inserted into a PCI slot, or any adapter card inserted into a PCI slot.
Anything to do with a PCI bus.

It also handles IDE devices such as an IDE harddrive, (Or harddrives), and IDE optical drive/s, (CD/DVD), plus SATA devices.

Plus it handles USB ports, an Ethernet port, and so on.
[The rest of the slower processes are detailed in the motherboard diagram]

The Northbridge chip on your motherboard will be under a Heatsink.
The Heatsink is glued on to the top of the chip.

(Chip and Chipset are slang terms for I.C.
Integrated Circuit)

http://en.wikipedia.org/wiki/Integrated_circuit

This photo shows a typical motherboard, and the Heatsink on the Northbridge chip,

http://en.wikipedia.org/wiki/File:Asus_a8n_VMCSM02.jpg

In the center of the photo you will see a square aluminum looking object, that has fins on it.
This is a Heatsink, and it's attached to the top of the Northbridge chip's case.

You can left-click on the photo to enlarge it. You can click twice.

(This Asus A8N-VM CSM motherboard, uses an Nvidia Northbridge chip, and an Nvidia Southbridge chip. The VIA chip you see is a Firewire controller chip. VT6307)

To your problem;

1) If your monitor cable is removable, remove it, and use a KNOWN to be good one. Check to see if it's a bad monitor cable.
If the monitor cable is not removable, use a Known to be good monitor, and it's cable.

2) The problem could be the Integrated Graphics on your motherboard. The GPU could be bad.
(Assuming you're not using a graphics card)

[ Integrated Graphics, and GPU:

GPU stands for Graphics Processing Unit. It is a chip.

The GPU could be soldered directly to the motherboard, or soldered to a removable adapter card.

Soldered to the motherboard = Integrated Graphics.
Another term used for Integrated Graphics is OnBoard graphics.
ON the motherBOARD.

Integrated graphics used on your motherboard, will have a blue VGA port that you plug your monitor into.
Newer motherboards will use either a VGA port, or a DVI port, (White), or both.

Soldered to a removable adapter card = Graphics Card.
Also known as a Video Card ]

The way you would test to see if Integrated Graphics is bad, on your motherboard, is to use a graphics card.

3) A VERY large percentage of computer problems is a bad Power Supply. Weak voltage power rail.

Has enough power to light LED lights, and spin fans, but not enough to turn the Processor on.

A) ALL of the LED lights combined use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts

C) A typical Processor can use 51 to 125 Watts.
(Older Processor's, such as an Intel Pentium III for example, use less power)

No processor operating, No computer.
No computer = No Signal on the monitor.
No video signal.

Aug 15, 2010 | Toshiba Computers & Internet

1 Answer

Acer aspire t135 turn power on green light comes on,no fans running turn on lcd moniter, sayes ACER then no signaig. but the cord and moniter work with laptop whatup.


if it BEEPS more then once...
pull out your mem chips and test,,
If it works then one of the mem chips are bad if not..
pull out all pci cards2_bing.gif and test.. if it works its a bad card...
if not unplug all HD and CD roms and test.......

If not kicking on yet its could be power supply, motherboard or the CPU chip

Apr 07, 2010 | Acer Aspire T135 PC Desktop

2 Answers

The monitor has no input signal, tried another monitor and had the same result


This could be an issue of a video card gone bad. I have experienced the same issue firsthand. This could also mean that no RAM is installed. If you have been using this computer previously, the second option is probably not even an option.

If you have another computer available, please try plugging the monitor in to that machine to test. If it works, your Video Card is more than likely toast.

But not to worry, you should be able to find a new card for that machine. I believe it will be a PCI Video Card, which may run you anywhere from $20-$100 depending on what you purchase. Please consult with eMachines before ordering a new card. Some will not work with your machine.

I hope this helps you out. Have a great day and please don't hesitate to ask any further questions regarding this issue.

Feb 26, 2010 | eMachines C6535 PC Desktop

1 Answer

E-machine t6212 won't boot. I actually have two e-machines that are not sending a signal to the monitor. One is a t6212. It is booting up because I can shut it down using the windows key + up arrow +...


If you get only one BEEP at boot then the computer is working..

Do you have a 2nd monitor to test with?

if it BEEPS more then once...
pull out your mem chips and test,,
If itt works them one of the mem chips are bad if not..
pull out all pci cards and test.. if it works its a bad card...
if not unplug all HD and CD roms and test.......

If not fixed yet it maybe a onboard video problem...

But IF you put a video card in b4 the problem started then your bios may have auto set it sellf to PCI/AGP mode.

Check bios setings,, look for onbord setings for the video

Feb 21, 2010 | E-Machines T6212 PC Desktop

1 Answer

LCD monitor back light won't stay on


Hello,

Running any device 33% higher voltage for any length of time will likely harm it. However, knowing that that worked you have two possibilities.

1. The 12V AC adapter is dying and simply needs replacement.

2. The FLR inverter(backlight) is dying and giving it some extra juice forced a little more life out of it.

Do your best to track down a propper adapter(with 5%, 11.4V-12.6V), if this works that should be your solution, if not then the FLV is dying and you may need a pro to replace it. Generally about $100 at a shop.

Hope this helps FixYa,

Chris

May 14, 2009 | Toshiba Equium 7100S PC Desktop

2 Answers

LCD screen not lighting


It sounds like the Backlight for your laptop gave out.

Heres a simple test to see if THAT is the case

Power it up while under a bright light 100W or better possibly even sunlight on a sunny day. Move the screen at varying angle to the light. If you can see what appears to be a "Shadowy" image of your desktop then YES indeed your backlight went out.

Your backlight should be replaced by an experienced service tech. Unless you are comfortable with working with high voltage electronics (The backlight has a charge capacitor) that can injure you if you are not careful.

There is a VGA connector on the back of your laptop. You can plug in a monitor to that so you may use your laptop. (Until you can get it fixed) Just plug in the monitor and press <Fn> and <F5> to switch to the external display

Hope this helps
Dave

Nov 14, 2008 | Dell Dimension 5150 (DIM515MIN) PC Desktop

1 Answer

In my Toshiba laptop there is a problem with backlight. Could you fix it ?


Yes it can be fixed with a new backlight if that's the problem. Start the computer and see if with a flash light you can see the windows xp starting up image or the desktop when it finishes starting. If so you need a backlight which looks like a small florescent light bulb. If not you could need a new LCD or video card or motherboard. You can test the LCD by hooking the pc up to an external monitor. If you can see the pc info then your video card is ok and your motherboard is ok. You need a new LCD.
Let me know if you need anymore help.
Henry

Nov 13, 2008 | Toshiba Computers & Internet

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