Question about Emerson EWC0903 9 in. TV/VCR Combo

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DC powered fine. AC Power intermittent

This set works fine with the DC power, but not with 110v AC.

Sometimes, when moving the set with it plugged in, AC will work.

Anybody found this "loose connection"

Thanx

Dave Shelley

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In order to find the connection, you will have to open up the tv carefully and follow the power supply in and probably a thin piece of metal will be broken and need to be resoldered back on. The broken piece will most likely be on or around the board.

Be careful when working on this because you could receive an electrical shock especially if you don't know what you are doing.

I would suggest letting the tv discharge overnight by unplugging it.

Please let me know if you need any further help or have any questions.

Thank you and good luck

Posted on Apr 14, 2008

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1 Answer

Display screen not ligthing up


Confirm voltage at the wall outlet and then move onto the voltage output from the power supply. The power from the wall outlet should be 110V AC. The voltage output from the power supply should be 12-14V DC. If these both check out as good readings, move up to the console to confirm 12-14V DC. If the console is getting power and still not coming on. then you need a new console.

SPORTSMITH LLC

Nov 26, 2013 | Stairmaster 4400PT FreeClimber

1 Answer

Plugged in and not charging


1) Use a multimeter, check the AC adapter (Charger) for power.
Make sure it is putting out the required voltage.

Have an assistant gently wiggle the cable FROM AC adapter TO laptop. See if there is an intermittent reading on the multimeter.

Have an assistant gently wiggle the power cord.

An intermittent reading on the multimeter indicates a broken wire.
Power cord is bad? Replace cord.
Cable from AC adapter to laptop is bad? Replace AC adapter.

If you have posted the laptop manufacturer NAME and MODEL NUMBER, I could have given you more than generic information.

Model Number is in the Bottom of the laptop. Post back in a Comment.

AC adapter works OK?

Check the DC Power Jack.
The DC Power Jack is the jack on the laptop, that the AC adapter plugs into.

DC Power Jack checks OK, this is your problem,

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

Regards,
joecoolvette

Jan 31, 2013 | Computers & Internet

1 Answer

Can you run 110v from a 115v geni*tools)


I'm a little confused about what 'geni' is.

The outlets in your home are rated at 120v AC and any equipment that you plug into them that state 110v or 115v will work fine.

If you are referring to some type of adapter that you plug into a wall and then into some electronic unit, be careful. It isn't just the voltage that you should be concerned with but the amperage!

Adapters generally take the AC current from a wall outlet and then convert it into DC voltage. This voltage is more or less specific to each device that requires DC input. As a basic rule, you must match the exact VDC and mA from your device with the same values on an adapter.

Jan 15, 2013 | 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

3 Answers

Hi when plug in my ac adapter into lenovo x61 the tablet will not turn on i try it on other computer and it will on what happen?


LOL, sounds like your tablet has seen it's better days. See why HP got out of the Tablet business? They are nothing but trouble.

Apr 08, 2012 | Lenovo Tablets & eReaders

1 Answer

Total Power Failure When Using the AC Adapter


1) Check the AC adapter. Use a multimeter set to DC Voltage, (Symbol is a dotted line over a solid line)

You aren't checking for voltage output, so much, as you are checking for an intermittent break.

AC adapter plugged into power, and probe leads of the multimeter touching the plug of the AC adapter going to the laptop, have an assistant gently wiggle;

1) First the power cord going to the AC adapter.
2) Then the cable from the AC adapter TO the laptop.

If you get an intermittent reading on the multimeter, you have a broken wire in the AC adapter cable, or power cord.

2) If the AC adapter shows VERY close, to the voltage it's supposed to be putting out, AND there is no intermittent break, go to the DC Power Jack.

[ A economical multimeter can be purchased for around $8 to $12.
Available in a multitude of stores. An auto parts store is but one example.

Analog, (Meter with needle), or digital is fine.

Multimeter's vary in style.
It will have a Function knob in the center. This is turned to DC Voltage.
As stated, if just a symbol, it is a dotted line over a solid line.
IF, there is more than one DC Voltage scale, set it to the 0 - 50 Volt scale.

The red probe lead is the Positive lead.
The black probe lead is the Negative probe lead.
You are testing DC Voltage. There is a Positive, and a Negative.

The plug of the AC adapter, that plugs into the DC Power Jack on the laptop, will have a Positive connection, and a Negative connection.

Plugs vary. The most common is a plug with a center hole, and a surrounding metal cylindrical shell.

The Center hole is Positive.
The outer cylindrical metal shell is Negative.

Need more advice post in a Comment ]

Depending on what laptop we are discussing here, the DC Power Jack can be soldered directly to the motherboard, OR it has a cable attached to it, and the cable plugs into the motherboard.
(DC Power Harness)

IF, it is the solder to the motherboard type, it has prongs, or pins, that come out of the bottom of the DC Power Jack, and goes through the motherboard. Then the prongs, or pins, are soldered to the motherboard.

With this style, if the DC Power Jack is bumped, the solder joints of those pins, may be cracked. Makes a bad contact.

Could also be bad enough to make a Short. (Laptop turns off when AC adapter is plugged in)

The DC Power Jack itself may be in bad repair.
Using as an example of the style that has a Center hole, and a surrounding cylindrical metal shell, (Inside), if the two parts touch, you can have a Short.

The diagnoses is to start with removing ALL power, AC adapter ('Natch), and Battery.
See with a small wooden object, if you can gently wiggle the DC Power Jack.

ANY perceptible movement means a bad DC Power Jack.
You will also have to partially disassemble the laptop, to check the DC Power Jack solder connections, to the motherboard.

3) DC Power Jack checks out, the problem has gone serious.

Mounted to the laptop motherboard is a power controller chipset.
It is a power MOSFET,

[ Chip and Chipset are slang terms for I.C.
Integrated Circuit,

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

The power MOSFET is a type of I.C.,

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

If you open the laptop, and view the motherboard, this problem will be readily apparent. This chipset usually burns, and turns blackish.

Problem is when it does, the manufacturer's ID numbers are hard to read, in order to obtain a replacement ]

This is one power controller chipset that is used in a LOT of laptops,

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

This is another one,

http://html.alldatasheet.com/html-pdf/85156/VISHAY/SI4925BDY/183/1/SI4925BDY.html

Both of these chipsets uses a D2PAK surface mount.
The leads are bent into a J shape. ( J Lead)

The 'foot' of the J lead is soldered to a copper pad on the motherboard.
(Copper Pad has a thin gold plating on it)

Simple de-soldering/soldering techniques, are used to Remove the chipset.
HOWEVER, use a Heatsink on EACH J lead, when soldering the new chipset in.

http://www.radioshack.com/product/index.jsp?productId=2103242

(The power MOSFET has transistor/s inside )

OR, replace the motherboard.

For additional questions please post in a Comment.

Regards,
joecoolvette

Feb 12, 2012 | Computers & Internet

1 Answer

Gateway kav60 not charging. i have to wiggle the cord and sometimes it refuses to charge.


I guess you've got a broken laptop power dc jack or power cable.


Symptoms of a broken Laptop DC power jack:


- The laptop only operates when you hold the DC power plug in a certain direction (DC jack is broken or loose).
- The laptop only runs on battery power (no power is getting through the DC jack).
- The laptop gets no power at all.
- The laptop will not charge the battery.
- The laptop switches from AC power to battery power intermittently due to a loose or broken power jack.
- The laptop suddenly shuts off.
- The DC jack may feel loose.
- Sparks come out of the back of the laptop when you insert the power plug into the DC jack.

Apr 21, 2011 | Lifetime Gateway KAV60 Replacement Laptop...

3 Answers

Advent N270 netbook will not charge. Orange light comes on initially then goes off. Also when I wiggle the plug into the laptop the light flashes on and intermittently.


It sounds like either a bad connection on the motherboard or a broken wire in the adapter making intermittent connection.

1. With the power adapter disconnected, do you have a power light? This would indicate the adapter is good and the plug is questionable.

2. Check your power adapter output with a multi-meter.(be sure to wiggle the wires around) If the power fluctuates, replace the plug.

3. If the power is solid, replace the motherboard connector.

Nov 22, 2010 | Intel Computers & Internet

1 Answer

Motherboard issue


It's a power issue. The battery is flat. (No charge present) The AC adapter (Charger) is plugged in. The DC Power Jack has an intermittent contact. (The DC Power Jack is where the AC adapter plugs in. The charger)

The DC Power Jack is broken itself, or where it's soldered onto the motherboard, the solder joint/s are broken. This gives an intermittent contact. To see if this is the issue, try holding the plug for the charger over to one side, when it's plugged into the laptop. You may have to move it side to side, or up an down, to see.

If this is the issue, the DC Power jack costs about $6 bucks. The cost to replace it is $120 to $150.

The tech has to completely disassemble the laptop, until just the motherboard is in hand. The old DC Power Jack is unsoldered, and a new one is soldered in. Then the laptop is reassembled.

IF, you can find a shop! Most of the time the entire motherboard is changed out. Now you're talking Ducketts! $$$$$$$

Dec 23, 2008 | HP (D7580-60003) Motherboard

1 Answer

Compaq Presario 1200 won't charge battery


dear N9YK

you can follow this

If you have a loose connection where you plug in the power on your laptop, or it works intermittently, you could have a bad dc jack. Symptoms
  • Move the power plug and the laptop loses connection
  • Broken or cracked dc jack
  • Laptop won't charge but worked on battery
  • Power LED and battery LED flicker when the adapter tip is moved
  • Battery won't charge
  • Sparks come out the back of the laptop
Why does this happen?
  • Flaw in manufacturer designs
  • Use of universal or non-original ac adapter
  • Lots of plugging and unplugging of the ac adapter
  • Tripping on or pulling the ac adapter cord
or you can check your dc amper in your adaptor

oke



thx

cropp

Mar 16, 2008 | Compaq Presario 1200 Notebook

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