Question about Acer Aspire L100 PC Desktop

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Testing the motherboard

How did you go about testing the caps? In my case I've got power into the case but no voltage at the frontpanel switch. Haven't poked around further. I needed to get my wife going quickly so I bought a barebones kit and popped the disk from the Acer into it.

Thanks
-clw

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  • 68 Answers

Hi there,

The failed caps have obviously vented at some point as it was swollen and an obious doming was present on the top of the cap.

I have inspected the other failed machine which Acer refused to repair alongside some other kit ive had fail recently and they all have the same rated cap failed.

Ive since found this article which could be the root of the problem with the acers.

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

As I said earlier what I found with mine upon applying power I heard a faint click from the piezo buzzer and the LAN LED flashes once.

Hope this is of help, if you need any more dont hesitate to ask.

Regards

Nick Sharp


Posted on Aug 21, 2008

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Posted on Jan 02, 2017

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Computer won't turn on.


There must be a problem with your power switch on your computer casing, or motherboard or power supply.

Detach your power supply and try this, to check if your power supply really works. If the auxiliary fan will turn, your power supply is good
25627818-lfqggqo5gl3n2v4xynrvsb5u-5-0.jpg Testing your power supply and motherboard as seen on photo
25627818-lfqggqo5gl3n2v4xynrvsb5u-5-2.jpg If the cpu cooling fan and power supply did not turn the fan, but you have checked already the power supply that is working then you can conclude that your motherboard is need to be replace. But the power supply and motherboard and working, meaning to say your computer casing need to be replace or try fixing the contact of the switches attach to your casing.

Have a good day.

Apr 04, 2015 | Dell Studio Xps 9100 Desktop Computer

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

Test a power supply


if your PSU starts (fan is spinning) you can test it with voltmeter. to check voltages for motherboard do next:
1. take PSU out of case
2. put power cable in
3. with some wire connect green and any black on MB connector on PSU (20/24 pins)
4. fan should start spinning
5. use voltmeter to check voltages

this is just basic. real PSU test is when you have device that will burden PSU while testing...

Nov 04, 2012 | Dell Computers & Internet

1 Answer

My Aspire M1600 (desktop) might have encountered an overvoltage surge and wont start at all. The lower blue LED on the frontpanel is flashing slowly (1 sec). Where to look /what to do? Looking forward. BR...


Test the power supply first- to do this you should use a "tester". OR un plug the power cable from motherboard 20/24 pin adapter and might as well unplug the rest of it for the testing purposes. With the 20 pin cable unpluged look for a GREEN wire on it then taking a paper clip TOUCH green wire to any SOLID BLACK wire. If the power supply powers up - fan comes on- its likely a Motherboard failure.

Note: you can (test power) on the power supply with everything plugged in by "shorting" the green wire to black wire for 5sec. if the pc AUTO turns back off after 5sec it is bad motherboard or "maby" CPU/actual processor.

If you can throw some other RAM into the motherboard and try to power on normally.

You might want to RESET the bios - look for a jumper on the motherboard with 3 pins and - while unplugged from wall power - move the jumper to the other 2 pins (should share the center pin from 1st position) leave there for 5sec then move back to origional pins it was on. Then re-connect power and turn on normally.

Aug 06, 2009 | Acer Aspire (AST180-US340B) PC Desktop

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Motherboard has an LED Light that says Stdby led


Did you ever find the solution to this problem

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1 Answer

No power to E-Machine T1860


hi,
Issue seems with the power IC of the motherboard need to repair.

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Dell XPS Gen 3 Power Surge - Motherboard dead or power supply?


Thanks for usnig Fixya.com.

Most computer power supplys have 3 different voltages coming out of them The motherboard light indicates only that the particular part of the motherboard that uses a particular voltage. The power supply may only be providiing power to that specific part of the computer. I would recommend trying another power supply to determine if that is the resolution.

Please let us know if this solves your problem.

Apr 06, 2009 | Computers & Internet

1 Answer

HP Compaq Presario SR2013WM ...Power Problems ?


Unless the power button sticks or does not pop back out, i doubt the issue is in the switch, but it can be tested by replacing it with a momentary switch from Radio Shack (not an exact fit, but good for testing)
This sounds like a power supply issue. That would be the first thing to check. If it is NOT connected to anything except the power cord , it shouldn't run unless switched on.
Could also be the motherboard, but before you start dismantling the computer , check the obvious. Open the case (usually to screws on the back) inspect all the cables, reseat your ram chips and addin cards.
Not to scare you ar anything, some of these presarios have bad capacitors on the mother board. coupled with the fact that they are difficult to clean (inside) and airflow is not maximized in the case, they tend to cause the capacitors to swell and leak, losing voltage.
When you are inspecting the insides of your case, take note of any capacitors (little cans with crosses on the top) on the main board inside around the CPU fan that are swollen or leaking.
If you find these in bad condition , i would replace the motherboard.

Apr 04, 2009 | HP Compaq Presario SR2013WM (RE468AA#ABA)...

1 Answer

Power on/boot-up problem


Have I got a story for you? Dell inadvertently used some defective capacitors in their Optiplex motherboards and some power supplies. From what I?ve experienced and read this affects the Optiplex 270 and early 280 lines. In my case my systems had video display problems and eventually ended up not booting. The giveaway is looking at the large 150 uf capacitors; they are the larger ones usually with an ?X? inscribed on the top. If the tops of the capacitors are flat you?re out of luck but if any of them are bulging (even slightly) at the top, leaking electrolyte or split Dell will replace the motherboard for free. This program is in effect till 2008. I wouldn?t recommend pulling the power supply apart but the flashing yellow power light for me has been a failed power supply. I would check out the motherboard for bad capacitors then call Dell. It?s likely they will replace the power supply if it?s in warranty, perhaps even if its out in light of the capacitor issue. If you?ve got some rounded caps on the motherboard I would also ask them to replace that as well. Let us know if you have any other questions and please don?t forget to rate this posting.

Mar 30, 2007 | Dell OptiPlex GX270 PC Desktop

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