Question about Acer Aspire 5920-6727 Notebook

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5920 will not turn on, adaptor green light brinks

Tried power reset suggested by Acer tech support site with no success.

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  • ckung0400 Aug 27, 2009

    In my computer, the two capacitors circled in the picture show a resistance of 0.5 ohm (short?) and the two diagonal side capacitors (under the wireless board) show a resistance of 1.8k Ohm. Now what to do? "

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The Aspire 5920 and most other acers with the same logic board style are notorious for component level power issues. The first possibility is a severed connection in the DC connector cable. Its somewhat rare but it happens. The connection is broken right where that cable meets the back pin of the DC connector. This can be easily resoldered and your problem is solved. Becuase the AC adapter is blinking this makes me think that there is a shorted component on the logic board. If you have access to a multimeter set it to check voltage, remove the large panel on the bottom case (4 long screws). Then remove the fan (3 small screws) and the heatsink (4 custom screws). Once these are all removed you can look at the back side of the DC connector and see the cable. The cable consists of 4 wires, 2 black, and 2 brown. Black are ground lines, and brown are power. Using your multi meter (1 lead to ground and 1 lead to power) see what voltage you have right at the logic board side connector for this cable. If this is not the cause of your problem you should see ~19v. If yousee less, or nothing at all, its likely that either your AC adapter is bad, or the cable has been severed on the DC connector side. The last possibility (the one I feel is the cause for your issue) is that you will see a pulsating voltage. This means you have a capacitor short on the logic board. There are quite a few possible caps on the board that could short out like this. The picture below shows the 2 most commonly shorted caps on this logic board. Use your meter to check continuity between both sides of these caps, if you gen full continuity then the cap, one in line with it, or another in the circuit is shorted. Remove both of these caps and then meter the 2 pads beneath them in the same way you metered the caps. If you do no receive full continuity anylonger, then 1 or both of those caps were the cause for the short. You can also meter the caps themselves off of the logic board and if you receive full continuity the cap/s are bad. If you have removed the caps and still register a short on the logic board, then its time to strip the machine down and remove the logic board, repeat these steps with all ceramic capacitors (like the ones in the picture) until you no longer register a short. Just as a side note, after removing components from logic boards you must wait until it cools to room temperature otherwise your mulitmeter readings may be inaccurate. 5920 will not turn on, adaptor green light brinks - f77b3d8.jpg

Posted on Aug 22, 2009

Testimonial: "Two capacitors circled show a resistance of 0.5 ohm (short?) and the two diagonal side capacitors show a resistance of 1.8k Ohm. Now what to do?"

  • 1 more comment 
  • samson175 Dec 02, 2010

    Checked power supply and reading 19v dc when pluged in to the laptop. The led on power supply flashes tested battery in an identical laptop and charges fine with tested charger. So ruled out both charger and battery. I followed directions and stripped laptop down tested all caps as in pictures. And found both were short so i removed both caps . I continued testing and also discovered the smd fuse located next to the laptop battery connector that was open circuit .So i bridged with solder as i didnt have a replacement smd fuse but (do so at your own risk) .I then connected power lead connector and attatched battery. Switched on psu and the orange led on the board lit up i then reassembled the laptop and all is working correctly .So thank you again to machteck saved me a fortune. Hope you keep up the good work cheers andrew vickers.

  • Jay14
    Jay14 Nov 24, 2014

    Can you circle the capacitors in the picture of the mobo

  • Jay14
    Jay14 Nov 24, 2014

    I do not know where they are located the picture you posted shows the mobo but not the location of the capacitors thanks

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To remove these capacitors properly you would require a hot air tool or an iron capable of working with lead free solder. These are expensive items so I do not expect that just anyone would have then lying around. These caps are redundancies within the circuit and aren't vital to the logic board. They can be removed and do not need to be replaced. If you're feling bold you can litereally take a pair of needle nose pliers and break the capacitors off of the logic board. Make sure not to pull them off, you want to crack them in half and remove the who parts carefully so as not to lift the pads that the cap was sitting on or pull up a trace connected to said pads.

Posted on Oct 15, 2009

  • Annonymous Nov 14, 2009

    @fixme_dom



    I'm pleased to hear the this fix worked out for you. The 5920 is also prone to quite a few battery charging circuit issues. The most common of which is the inability to run off of the battery. You can power the machine, boot to windows, and check the batter power meter. It could read 100% and the second you unplug the AC adapter the unit immediatly turns off. This is due to a blown fuse in the circuit preventing battery power from reaching the system board. I have included the best picture I could find. Its a little small but i have circled the defective component. You should try to replace it. This may be difficult becuase you would want to replace it with the exact same fuse. For a short term fix you can simple bridge the connection once the fuse has been removed to allow power through. This will solve your problem but may be dangerous to use without a fuse in that location.




    @roccostan



    These are standard ceramin capacitors that you could find from almost any other laptop logic board. They are not vital to the circuits they are a part of. You technically do not need to replace them, you can just remove them and the machine should run just fine. I am sure you can purchase them from ebay in case you perfer to replace rather than remove. Yes they need to be soldered on to the logic board. As for the condition of your AC adapter and/or motherboard, telling me that a certain area gets warm doesn't tell me enough to assist you. If you have access to a multi-meter please check for a short on the V+ line on the motherboard. You can do this by putting both leads of the meter on the sides of the ceramic caps mentioned in my previous post and check for continuity. If you receive a full continuity reading (a solid constant beep) then you have a short somewhere on this line. For the Aspire 5920 this is most likely a cap.

  • Vinnie Feb 26, 2012

    Thank you Sir, this saved me $179.00+ for a new board. Used real small needlenose pliers and broke them off and BAM, the board works perfect again, thnx

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With the bottom open and the empty side Battery facing you (speaker is to the top right). I have 1 good Acer 5920 and one that is completely dead. In the dead unit, I check continuity of each of the white power female pins to ground and all were shorted (beeps) which means the power is shorted to ground. I found that PC118 and PC112 on the good unit has 0.09 both ways. The dead unit has 0 both ways. I broke off both PC118 and PC112. Put it back together and it works like normal. As you can see from the electrical drawing, the 2 caps shorted to ground will prevent the laptop powering up. I looked for a while for PC108 but could not find it but it works so I guess it was not bad. Like everyone else, I am wondering where to buy replacements. I 5920 will not turn on, adaptor green light brinks - 1_14_2013_3_59_12_am.jpg

Posted on Jan 14, 2013

  • 3 more comments 
  • Dave Edwards
    Dave Edwards Feb 01, 2014

    Dave

  • Dave Edwards
    Dave Edwards Feb 01, 2014

    Fixed by changing caps as suggested. - you can get these from RS 10uF 25V ceramic - like for like in size.

  • Dave Edwards
    Dave Edwards Feb 01, 2014

    Dave

  • Dave Edwards
    Dave Edwards Feb 01, 2014

    RS code is 691-1199 - min buy 10 @15p each

  • Victor Nunes Jun 12, 2014

    Do you have the full schematics? I had a PC112 shorted, removed it the computer now light up to standby, but it just cut off when hitting the power button, I found that removing the internal lcd cable, the computer works and boot just fine plugged to a vga monitor. plugging the lcd back on shuts down the laptop instantly, I could track that the lcd uses the 19v rail, but I couldn't find any short on the lcd, my guess is that the laptop power supply is entering in protection mode, but I can't find the faulty.

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QUANTA ZD1 - REV E.pdf for component list

Posted on Mar 22, 2011

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The blinking light on the adapter could indicate a motherboard issue or a short in the adapter cable. Try another Ac adapter. If the issue is still the same try to power on the system with a charged battery. If still no go. Contact ACER support as it can be a hardware failure.

Rate if useful.

Posted on Aug 19, 2009

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Can anyone post a picture of the mobo with the location of the capacitors identified?
thanks

Posted on Nov 24, 2014

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I had a PC112 or 118 shorted, removed both, and the computer now light up to standby, but it just cut off when hitting the power button, I found that removing the internal lcd cable, the computer works and boot just fine plugged to a vga monitor. plugging the lcd back on shuts down the laptop instantly, I could track that the lcd uses the 19v rail, but I couldn't find any short on the lcd, my guess is that the laptop power supply is entering in protection mode and I have to reset by unplugging the charger and waiting a few seconds, but I can't find the faulty. Does anyone have any clue?

Posted on Jun 12, 2014

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Hello guys sorry for posting after a while but heres my situation, i checked continuity and found a short in pc112 and removed it(i didnt use solder i just took/broke it off with my hands) all was good i powered on, as i fully powered up i tried to move it and the charging cable slipped out, the pc turned off, (apparantly the battery doesnt work anymore) trying to turn it on again doesnt work. the charging led lights up but absolutely nothing else does possibly another short? i thought pc112 wasnt necessary is it? would this happen if i removed the capacitors wrong? what does the pad look like anyways that you speak of?

Posted on Jun 07, 2013

  • Basel Dadsi Jun 07, 2013

    i also forgot to mention that i tried to remove the battery while having the charger in, i got the orange light on the front to light up, so i put it back in, orange light dissapeared, but when i tried to take out the battery again it doesn't come on this time anymore, or any other light around it. the only light that lights up is the charging led, nothing else

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Thank you
i was removed PC112 and all work fine ( also i was replaced PO32 - Fairchild FDD6685 30V P Channel MOSFET-short circuit)

Posted on Nov 28, 2012

  • tommyl1983
    tommyl1983 Nov 28, 2012

    thank you
    i was removed PC112 and all work fine ( also i was replaced PO32 - Fairchild FDD6685 30V P Channel MOSFET-short circuit)

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Guys.. I had the same problem on my Acer 5920G After setting the laptop in Sleep mode, i accidentaly removed the Power supply from the laptop and i hadn't any battery connected to it. When i inserted the battery (Empty) and i connected the lap on the power supply, the charger green led started blinking... The laptop was dead, no sign from the orange led when battery is empy, no blue led indicating that i have charger connected. Only the green blinking light on charger. After 10 minutes, i hear something blowing inside the laptop, to the black thing writing "100PF" that can be seen from Annonymous. The "charging" led indicator started blinking like crazy so fast and i immediatly removed the power supply from the laptop. I smelled something like "****", and by touching this black 100PF thing it was very hot !! After this, if i press the button to boot the laptop, i can see an Orange identification says "No battery!" which i couldn't before. I also can boot the laptop "with removed battery, hadn't tried to place the battery after this" with the power supply connected.. But before the **** smell, the laptop was really dead.. What can i do?? What is this 100PF black think?? Is this my problem?? Help plz !! Thanks by advance.

Posted on May 18, 2012

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Thank you
You Sir are a genius, saved me a 179.00 motherboard replacment. All I did was break them off using some real small neddlenose plaiers and BAM, laptop working like new, thank you

Posted on Feb 26, 2012

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Hi,

Thanks to you i was able to localise the bad caps PC112 PC118 and PC90. After removing them everythings seems to work fine (Green LED on the PowerSupply doesn flash anymore and the Blue LED on the Laptop is working).

Now i want to know if i can run the laptop without those caps, or does i have to replace them before using the laptop?

Thanks in adavance for your help.

Greetings

Posted on Jun 12, 2011

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I only removed the capacitor and it had no effect, so will i need to bridge the connection for now? I had the no power problem and removing the two other capacitors beside the RAM gave me power but the laptop will not run off the battery.

Posted on Feb 08, 2010

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Hey Machtech

Your solution worked, I soldered off the capacitors you suggested and replaced them and the laptop now powers on!! BUT If I try to run it just from the battery, there is no response. Any clue why this might be??

P.S. I have tested the DC Voltage of the battery and it is all good.

Posted on Nov 08, 2009

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Machtech, if the capacitators are short as you describe then how do you replace these? where can they be bought from? do they have to be soldered on?
Matchtec, i too have an Acer 5920 which suddenly stopped powering up, its just out of warranty and the pc shop said that the motherboard is dead and that a new motherboard is required. DC adapter is fine as i have a new one as one plugged in the bottomm of the laptop just below the battery does get warm, so power is being sent but something is preventing it from booting up.

Posted on Aug 27, 2009

  • marcelhb Jan 31, 2011

    Guys, it would really help if someone could tell us what`s the specifications of these capacitors... The PC112, PC118 and PC124, that usually give us problems... Until now I`ve found:
    PC112 - 80V Vrrm, 10pF Capacitance Varactor Diode
    PC118 - ???
    PC124 - 50V Vrrm, 15pF Capacitance Varactor Diode
    Use it at your own risk..
    Cya =)

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