Question about HP Hewlett Packard ALL-IN-ONE-TouchSmart IQ504t- Intel Core 2 Duo T5750 , 4GB DDR2, Intel Media A... PC Desktop

1 Answer

New DC jack, powers up but no display. Strange power LED behavior.

With the new jack soldered in i plug the power supply in and the LED blinks once (white) then goes off. Unplugging it from the wall gives again a short blink, a few seconds after unplugging. No short circuit, tested that. Also tried a different power supply, no changes. Powers up, fan, hdd and CPU seem to run or warm up, but no display, no bios. According to HP support the power LED should either stay off (no power), stay on (power, and battery fully charged), blink white (faulty powersupply/low voltage) or blink yellow (battery charging) What does it mean when the light comes on but turnes off right away? Only coming on once more when unplugged and the voltage is dropping. Led in Capslock key blinks once, is supposed to mean a faulty CPU. I dont want to believe that... Any isuggestions are most welcome. B.t.w. when i received the laptop, a small metal part from the old broken DC jack was loose and ratteling inside, while the battery was attached. I guess this could have damaged something? Am currently running out of options... Rob.

Posted by on

  • rob_zaandam
    rob_zaandam Apr 22, 2013

    It's a HP620 laptop.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • HP Master
  • 5,660 Answers

No Rob, you aren't running out of options. You just haven't diagnosed far enough, because you don't know the path.........hence where I come in.........

Using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's, as an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

There are two Power MOSFET's being used.
The Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, and the Alpha & Omega Semiconductor LTD - AO4407 Power MOSFET.

Both of these P.MOSFET's are Obsolete. However there are cross reference examples given. Let's look at two of these examples, and also note the cost,

http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/FDS6679AZ/?qs=sGAEpiMZZMshyDBzk1%2fWi1qxDdW%2fXBi2qgMuZEfLVO4%3d
One dollar and one penny - USD

http://www.mouser.com/ProductDetail/Diodes-Inc/DMP3020LSS-13/?qs=%2fha2pyFadujguNNSgppBRqXbOxXLwzGsZm9SWxz1EqWpzoSJOpHpWA%3d%3d
78 cents - USD

Surface mount soldering 101,

http://www.youtube.com/watch?v=3NN7UGWYmBY

For additional questions please post in a Comment.
Regards,
joecoolvette

Posted on Apr 23, 2013

Testimonial: "Excellent advice. Clear, to the point and accutate!"

  • joecoolvette
    joecoolvette Apr 28, 2013

    Thank you for the kind words!

×

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

SOURCE: HP Media center 1170m

Hello Moneymakey, have you sorted out your machine's problem?


I had the same problem on my HP t350.uk machine but with different symptom.

It first appeared one year ago when my daughter switched off the machine (everything was fine up to this point) at night. The next day, the machine could not be started but she noticed the machine's power supply light was flashing. It was in this state for a few hours as she does not know what to do. Then suddenly the flashing stopped and machine can be started and everything returned to normal.

Then about half a year ago, I turned off the machine to add some memory (from 512mb to 1.5gb) and could not start the machine while the power supply light was flashing. My daughter told me the trick but it did not work after a few hours. So I left the machine connected to power over night. Next morning, the flashing was gone and everything returned to normal.

 

But later on, the machine occasionally ran into a freezing state, not responding to any input.  So a few days ago, I turned off the machine, and did some connection checking on the motherboard. But this time, the flashing never stops flashing, even after I have unplugged almost everything.

 

The flashing stops only after I unplug the power to the motherboard. By manipulating this power cable to the motherboard, I can manage to turn the flashing to the constant flashing, but the machine still can’t be turned on.

 

I was just wondering this event sequence would inspire any useful trouble shooting thoughts

 

Dr Q Mei

 

qm@qm18.wanadoo.co.uk

Posted on Oct 14, 2007

  • 12 Answers

SOURCE: compaq presario sr1115cl wont power up

Remove the power supply after everything is unplugged and take it to your nearest electronics store. They should have a tester there. This is probably the problem.

Posted on Jul 01, 2008

  • 116 Answers

SOURCE: No power to a SR1420NX.

Power supply light on or flashes Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure: CAUTION: This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.

  1. Disconnect everything from the computer, including the power cord.
  2. With the power cord disconnected , press the power button on the front of the computer for five seconds. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps. NOTE: If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply
  3. With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America. Performing this step ensures that the voltage switch is engaged and set correctly for your country/region. Figure 4: Voltage selector switch c00517964.jpg Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
  4. Plug a lamp into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.
  5. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it. NOTE: If you find the device that was causing the problem was a surge protector, resetting a breaker or fuse on the surge protector may fix the issue.
  6. Remove all attached devices except for keyboard, mouse, and monitor.
  7. Remove any internal component that was recently added, such as video card, memory, CD, DVD, and hard drives. An added device may take more power than the power supply is rated for. If the problem goes away when the component is removed, the only option is to upgrade the power supply to power supply with a higher wattage rating.
  8. Check the power switch:
    1. With the power cord disconnected, press the power button on the front of the PC. The button should release easily and not stick in the socket.
      • If the button sticks, it should be replaced or serviced.
      • If the power button does not stick and appears to be functioning, continue using these steps.
    2. With the power cord disconnected, remove the case or side panel.
    3. Follow the wires from the power button on the front of the computer to their connection on the motherboard.
    4. Look at the power switch cables connected to the motherboard. If the cable has become disconnected, connect the power switch cable connector to the connector on the motherboard. Figure 5: Power switch connector on Motherboard c00517968.jpg
    5. Replace the side panel, plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.

Posted on Dec 12, 2008

info2u
  • 596 Answers

SOURCE: BLINKING POWER LIGHT

When you restart your notebook do you have a blinking cursor when the system freezes? It sounds like you need to reset your BIOS. To do this, power off then on your unit, Press F10 to enter BIOS settings, and then F9 to reset the BIOS to default settings. (Your functions may be a little different but you can read your menu to see which function key to select.) Once this done, select "Save and Exit BIOS" This should get you going. As for the blinking light, sometimes this happens when the battery is not holding a charge. If your battery is new, try the BIOS reset first and comment on your results. I can guide you through the battery reset process, if needed. Good Luck.

Posted on Feb 02, 2009

  • 16 Answers

SOURCE: Hp desktop wont start

I think you have more than one problem there. Take it to a local PC repair shop and have them check it out. Five years is a good age for a computer though so you may want to think about buying a new one. Best of the Irish Luck to yer.

Posted on Sep 16, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Amilio laptop not charging in spite of new charger


please measure the output for your charger,normally they have 19.5 vdc exactly, if they do not measure the adapter is faulty, repair or replace.If the output is o.k the battery can be faulty. Use the software diagnostic coming with the computer, restart the computer HOLD the key f2 or esc depending of your computer model, and make the diagnostic.try again and see what is the result, if the battery is o.k or faulty.God bless you

Apr 05, 2013 | Fujitsu Computers & Internet

1 Answer

No power on my samsung rv510


Zinzee, check the AC adapter first. (Charger)
Wiggle the power cord from AC adapter to surge protector.
See if the AC adapter LED power on light, blinks.
Yes? Bad power cord.

No change?
Go on.

The port on your laptop that the AC adapter plugs into, is the DC Power Jack.
Wiggle the cable from DC Power Jack to AC adapter.
Power On LED light up, or blink?

Change? New AC adapter. (Also need to check DC Power Jack center pin, to ensure problem is cable, not DC Power jack)
No Change?
Go on.

Unplug the AC adapter from the surge protector. You will need a multimeter now.
An economical multimeter can be purchased for as little as $5 to $12. Available at a multitude of stores. An auto parts store is but one example. (Not for $5 probably )

The Function Knob is set to DC Voltage. (DCV)
If just a symbol it is a dotted line over a solid line.

The center hole in the plug of the cable that goes to the DC Power Jack, is the Positive connection. This is where the RED probe lead (Positive), of the multimeter goes to.

The outside cylindrical metal shell of the plug is the Negative connection. This is what the BLACK probe lead (Negative), touches against.

You should read very close to 19 Volts (DC)

Have an assistant wiggle the AC adapter cable to DC Power Jack.
AC adapter is good? No intermittent reading on multimeter?
Go on.

Remove the Battery. Take a No.2 pencil, and use the eraser to GENTLY, see if you can wiggle the center pin around, of the DC Power Jack in the laptop. (DC_IN)

ANY perceptible movement means a problem with the DC Power Jack.

http://www.amazon.com/POWER-SOCKET-CONNECTOR-SAMSUNG-SERIES/dp/B008AGK43O

Chose link for the 4 views of the DC Power Jack.
Underneath the large Main view, there are 4 smaller views. Click on the one all the way to the right.
This is a view of the Back of the DC Power Jack, and the side that faces in on the laptop.

Note the L-shaped prongs on each side of the jack. These go down into the motherboard, and are soldered to the motherboard.
The 3 vertical lugs you see on the back, are the power, and Ground connections for the jack, and are also connected to the motherboard.

1) The center pin of the jack mounts to the jack's body, like a rivet. It is squished on the back, and this holds it in place.
Very easy to break that mount, and loosen the center pin.

2) The connections on the back are soldered, as previously stated, as are the 'L prongs' on the sides. Solder connections are also known as Solder Joints. If the jack moves with the pencil, and it seems to not just be the center pin, one or more of these solder joints could be cracked. (Broken)

Number 1 above means P-r-o-p-e-r-ly removing the DC Power Jack, and properly soldering a new one in.

Number 2 above just means re-soldering cracked solder joints.

DC Power Jack proves to be good?
Go on.

At this point those who use the moniker 'Technician', but in reality aren't a tech, will want to replace the motherboard.
In reality the Power MOSFET's should be checked, to see if they are good.

IMHO a $4 to $5 P.MOSFET (Or two of them), is much cheaper than a $200 motherboard.
Of course if there is $125 to $150 in labor, the savings isn't that great.

Buy an ESD wrist strap, connect it's alligator clip to a good ground source, remove the motherboard, buy the DC Power Jack, and take both to the tech. Should be about $50 labor, or less to replace the Power MOSFET/s. (May not be both of them, just one)

http://www.radioshack.com/product/index.jsp?productId=2103245

[ I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.
You can also set a large metal serving tray (Unpainted), on the table you are working on, or a large metal knickknack (Unpainted), and connect to it ]

No Zinzee I do not know what manufacturer, and manufacturer number, of P.MOSFET's are used on your Samsung.
I DO KNOW;

1) They us J-leads on the bottom.
Examples,

https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg

http://www.siliconfareast.com/soic.htm

They are located near the DC Power Jack on the motherboard, usually. Example using HP dv6000 and dv9000 series laptops,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Using Fairchild FDS6679 Power MOSFET as an example,

http://www.ic2ic.com/search.jsp?sSearchWord=FDS6679

$2.74 US

For additional questions please post in a Comment.

Regards,
joecoolvette

Sep 07, 2012 | Samsung Computers & Internet

1 Answer

AC adapter power connection LED blinks but not charging


This suggests to me that you need to check out the AC adapter, and see if there is an intermittent short. In otherwords a break in the wires.

AC adapter unplugged from laptop, and power, remove the AC power cord from the body of the AC adapter.

Use a multimeter set to OHM's, (1K), and connect the Positive (Red) probe lead to one of the flat bladed prongs, in the power plug that plugs into the surge protector.

Touch the Negative (Black) probe lead to one of the holes in the plug, that goes into the AC adapter 'body'.
Keep going from hole to hole, until you get a reading.
Now have an assistant gently wiggle the power cable, and see if you get an intermittent reading.

Do the same for the other plug's flat bladed prong.
Intermittent reading means replace the power cable, or if more feasible, the entire AC adapter.

Power cable proves to be fine, move on.
Plug the power cable back into the AC adapter. Plug the AC adapter into power.
Using a multimeter set to DC Voltage, touch the Positive (Red) probe lead of the multimeter, to the center hole of the plug that goes into the laptop.
(If just a symbol, the DC Voltage symbol is a dotted line over a solid line)

The Negative (Black) probe lead, touches the outside cylindrical metal shell, of the plug.
Have an assistant gently wiggle the cable, and see if there is an intermittent reading on the multimeter.
(Reading should be 18.5 Volts DC)

[There are Analog multimeters which have a scale, and a needle, and Digital multimeters that just have a digital readout.
If using an Analog multimeter the needle will drop towards 0.
If using a Digital multimeter the readout will drop to smaller numbers, or 0 ]

AC adapter checks out? Go on.

The port on your laptop where the AC adapter plugs in, is the DC Power Jack.
AC adapter unplugged from laptop, Battery removed.
Take a pencil, and gently use the eraser end to see if you can wiggle, the center pin of the DC Power Jack.

ANY perceptible movement means a problem with the DC Power Jack.
The GOOD news is that the DC Power Jack, is NOT soldered directly to the motherboard.

It slides down in a Channel on the outside edge of the Base Enclosure, and has a wiring harness coming from it.
The end of the wiring harness has a plug, that plugs into the motherboard.

The HP part number for this DC Power Harness is HP 600630-001

A) http://www.dectrader.com/600630-001-New-HP-DC-input-power-socket-connector-With-cable.html#.UD0_w6B0k9Q

B) http://www.ebay.com/itm/HP-Compaq-600630-001-DC-Power-Input-Jack-Cable-CQ42-G42-Notebook-Series-/180932154005?_trksid=p4340.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26meid%3D1653940420718665976%26pid%3D100011%26prg%3D1005%26rk%3D1%26

This is a link to a free Service Manual from HP Support,

http://h10032.www1.hp.com/ctg/Manual/c02627955.pdf

Page 73 is for the Power Connector Cable.

No damage to the DC Power Jack, and the harness is not slightly unplugged?
Now you have real problems.

You have a bad Power MOSFET,

A) MOSFET:

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

B) Power MOSFET:

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

C) http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

However it doesn't take a rocket scientist to replace. (Sorry Gort)
These SMD's use a J-lead contact. Simple unsoldering, and soldering.

(Better be fast though as you don't want to overheat a power transistor. Better be good, because you don't want any cold solder joints)

For additional questions please post in a Comment.
Regards,
joecoolvette

Aug 28, 2012 | HP Computers & Internet

2 Answers

Hey, I have a samsung R60 Plus laptop for a few years now, and its out of warrently and the DC jack power socket has just stopped working. I ordered in a new DC jack for the power socket and soldered out...


When the short happened it caused a feedback in the power supply charger, I would sub out the power supply with a replacement as a first important step to see if the laptop will come back online.

May 21, 2012 | Samsung Computers & Internet

1 Answer

Presario laptop issue with power indicator light and detecting powers supply


Sounds like your DC Power Jack is bad or broken. The DC Power Jack is where the power cord plugs into the laptop? Most times it get damaged by too much stress on it such as sitting in bed with the laptop, or putting the laptop in the laptop bag with the power cord still plugged in.

Take an ink pen and put it into where the Power Cord normally plugs into the laptop. If the pin inside the DC Jack is loose or wiggles then the jack is probably bad. Sometimes the jack can be completely burned out and you can smell smoke .

If the internal DC Power Jack is loose, you will have totake the laptop apart to repair it. The DC Power Jack is on themotherboard and most times it is soldered to the motherboard. That meansyou will have to desolder the old one and solder a new one in it's place. Sometimes the dc power jack sits in a slot between the bottom case and palmrestwhich hold it in place and has a cable harness that plugs into the motherboard.

Apr 05, 2012 | Computers & Internet

1 Answer

Plugged in, not charging. I bought a new charger, a new battery and still not corrected! Is there a software fix?


Hi,

Try to check your charger adapter LED. If your charger LED is blinking or dim, your motherboard was short on power block. If not, check DC in jack port. Maybe got some cold soldering joint.

Thanks for visiting FixYa. We answer your question for FREE. Please feel free to click on "YES" button in return. Have a good time...!

Thanks

Jun 28, 2011 | Dell Inspiron 1525 Notebook

3 Answers

No power! power cord is good, but when inserted in the charging jack(laptop) the inside is loose and no charge is being sent to the battery. How do I replace the inside thing so power can be sent to the...


Here below is a guide about how to repair laptop DC jack, may it will help.
http://www.laptoprepair101.com/laptop/2007/12/06/dc-power-jack-repair-guide/

Jan 20, 2011 | Balance Computers & Internet

2 Answers

My laptop lenovo 3000 N100 battery has a problem.. therefore i purchased a new battery but the problem with this battery is that when i use the battery it runs the laptop for 10 -15 mins and then with a...


My Dell laptop has a power problem.
d600a.jpg?w=300&h=258
The Dell Precision M20 Battery stops charging when I move the power cord on the DC adapter. When I start moving the cord left to right, the power LED light on the front goes on and off and the battery charge LED goes on and off too.
dell-precision-m20.jpg?w=300&h=225
I removed the precision m20 battery and tested the laptop again. The laptop starts fine from the DC adapter when the battery is removed, but as soon as I start moving the power cord the laptop shuts off. It looks like the laptop looses power immediately.
If you have a problem like that, most likely it’s related either to the power adapter or the DC-IN power jack.
First of all, I tested the laptop power ac adapter with a multimeter. The power didn’t cut off no matter how badly I moved the cord. The power adapter output voltage was 15.45VDC all the time. That means there is nothing wrong with the power adapter and most likely there is a problem with with the power socket inside the laptop.
Now I’m going to test the power socket inside the laptop.
In order to access the power socket I had to disassemble the laptop and remove the top cover assembly with the display.
You can find disassembly instructions for many HP, Dell, IBM, Lenovo, Sony and Toshiba laptops in these service manuals and guides.
In the laptop I was fixing (Tecra M2) the power jack is attached to a DC-IN harness and this harness can be unplugged from the motherboard.
As you see, I removed the DC-IN harness from the motherboard, plugged in the power adapter and tested continuity with my multimeter as it shown on the picture.
When the power cord is still, the voltage output is 15.45VDC, the same as on the plug.
But as soon as I start wiggling the plug inside the jack, the power cuts off and voltage goes to 0. It means, the power harness is bad.
The problem was fixed after I replaced the defective DC-IN harness with a new one.
In some laptops the power socket (DC jack) is soldered to the motherboard.
If the battery stops charging when you wiggle the power plug inside the jack, either you have a bad power adapter (test it with a voltmeter) or the power jack is broken or loose.
You cannot simply unplug the jack and replace it with another one. You’ll have to unsolder the old jack and solder a new one back on the motherboard as I described in this post.
If the power jack is not broken but loose (not making good contact with the motherboard) you can resolder the old jack without replacing it with a new one.
If you want to buy a new one,you can see more information from http://www.udtek.com

Feb 18, 2010 | Lenovo 3000 N100 Notebook

1 Answer

Can the dc power plug be repaired?


If you are referring to the DC Jack..(the port where your AC Adapter Plugs into) then typically No, THey are cheap enough that it is best to replace with new.... Yes they can be repaired, but chances are they won't hold up to the stress, and will just cause problems down the road...

Desolder The Faulty DC Jack... Go Slow, Use Solder Wick/Desoldering Braid... And A Solder Gun...Flip Motherboard to the underside of the DC Jack, You want to put a very small amount of FRESH solder on all Pin ends of the DC Jack - this will allow better flow of the solder when trying to remove...
Then Use The Desoldering Braid and slowly remove the solder from the DC Jack Pin Contact Areas... Do Not Rush or you will ruin the contact pads on the motherboard, you must make sure all solder is removed,,, if you attempt to rip out the jack cause you think its "good enough" you will end up pulling the C ring from the center of the Jack Pin Hole...

Once You Have All Solder Removed Use Some Flux Paste And Again go over each pin to ensure all solder is gone, then you can remove the faulty DC Jack...

Now.. Clean the motherboard where the DC Jack Was... Remove All Old Flux and take your solder gun and go over the Jacks contact pads so that you have fresh solder on all...

Now Add a small amount of flux to all the DC Jack Contact Pads and add alittle to the Pins on the replacement DC Jack.....

Then Solder The New DC Jack Into Place... Solder The BottomSide First... The Pin Ends ..

Then Flip Over and add small amount to the side negative pins and the power pin(s)...

Now you are done..

You can add Some Heat Resistant Automotive Epoxy ( Safe On Electronics) to the sides and back of the new dc jack.... this will double the strength and prevent future damage/wear and tear...

Nov 19, 2009 | Gateway MT6821 Notebook

2 Answers

Asus notebook


Get a new power supply which works properly

Mar 18, 2008 | Computers & Internet

Not finding what you are looking for?
HP Hewlett Packard ALL-IN-ONE-TouchSmart IQ504t- Intel Core 2 Duo T5750 , 4GB DDR2, Intel Media A... PC Desktop Logo

224 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18402 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Are you a HP Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...