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Background static when power inverter is on - Radio Communications

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Bad rectifier in the power supply.

Posted on Nov 17, 2010


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Have LG plasma tv model 50PG20 static on audio all the time.

If you wish to get advice over phone; visit
It's an absolutely free service, and so many experts are online. a 24hour/365day service.

Nov 22, 2016 | LG 50PG20 50 in. Plasma HDTV

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The settings for welding aluminium using a Tig200P AC/DC inverter

If you are using a remote then you would set the machine in standard for controlling output and also to AC output, HF tig, contactor and control in remote position. I don't know if this helps or not but I pulled it from an owners manual.

1/16" (.062) - pre-flow .1 sec., hot start 20, amperage 70, Hz 100, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 100, background current 30, Hz 1.0

1/8" (.125) - pre-flow .1 sec., hot start 20, amperage 150, Hz 80, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 150, background current 50, Hz 1.0

3/16"-1/4" - pre-flow .1 sec., hot start 20, amperage 185, Hz 60, balance 20%, post-flow 8.0 sec.
For pulse settings - set pulse width 60%, peak current 185, Background current 125, Hz 1.0

Mar 14, 2014 | ARC Thermadyne Inverter Stick/TIG Welder...

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My screen get black, but the pc is still operating, it hapen randomly, no matter if i was using the laptop for 3 min or 50 min

The Inverter is what goes out 90 percent of the time.

An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is used to provide the additional light source.

A Backlight is a CCFL. Cold Cathode Fluorescent Lamp.
Similar to Fluorescent bulbs, (lamps), use in homes, and businesses, but on a Much smaller scale.

An Inverter is used to provide power for the LCD screen, and the Backlight.

A laptop's power source cannot provide enough power for an LCD screen.
The Inverter does.
A laptop's power source provides too much power for a Backlight.
The Inverter reduces the power.

An Inverter slowly goes bad as a general rule.
A Backlight goes out all at once.

An Inverter is a small circuit board located in the Display Assembly.

The Display Assembly generally consists of the top cover of the laptop, the LCD screen, (assembly), the Backlight, Metal frame going around the LCD screen assembly, the Inverter, Wireless Antenna, Bezel, and various fastening screws.
(The LCD screen is an assembly. It consists of layers, held together by the above mentioned metal frame)

The Bezel is the thin plastic frame that surrounds the LCD screen, in the front.
Once the Bezel is removed, you will have access to the Inverter.

As I am sure you are aware, HP bought out Compaq.

HP Support > Compaq Presario CQ50-110us Notebook PC > Manuals,

On this page I would like you to scroll down, and click on the Service Manual > (Free, and in PDF file form),

HP G50 Notebook PC and Compaq Presario CQ50 Notebook PC - Maintenance and Service Guide.

This is a PDF file. After you click on the above file name you won't see anything happening right away.
The file is downloading in the background.
(I downloaded this file just now. Took 4 seconds to see the first page, and an additional 41 seconds to fully download. Watch the Download Progress Bar, and let the file download all the way before looking through it)

In the Bookmarks menu to the left, click on the + sign next to > Removal and replacement procedures
Now click on the + sign next to > Component replacement procedures
Finally scroll the file tree down a little bit, and click right on > Display assembly

[ You may wish to reduce the view size to 125% or 100%. Go to the top header, and click on the Zoom Out icon. ( - ) ]

Page 61 in the PDF page number box shows you where the Inverter is located.
(Top header to the right of the blue down arrow)

BEFORE you start:

1) Work on a table
2) Remove ALL power to the laptop. Remove the AC adapter (Charger) and Battery

3) It would be advisable to buy, and wear an ESD wrist strap. (Electro Static Discharge)
Connect the alligator clip to a good ground source.
(I connect to the metal frame of an empty desktop computer case, for example. You may have an object that is similar)

The cost of an ESD wrist strap averages around $3 to $6. An economical $3 ESD wrist strap will do just fine for this one-time procedure.
[ Your body carries Static electricity. Static will fry out (Short Circuit) the hardware components inside a computer. An ESD wrist strap connected to a good ground will keep your computer safe ]

4) Use a multi-compartment container for the various screws you will remove. label the individual compartments for the area the screws came out of. Some of the screws look VERY similar to other screws. You Don't want to mix them up.
[ You can use a clean egg carton in a pinch. Label each egg holder ]

5) After all power is removed you have to remove in order;

A) The WLAN Module. Page 49
B) The Keyboard. Page 52
C) The keyboard Cover. Page 54
D) Then the Display Assembly

From a quick search, for an Inverter for the Compaq Presario CQ50-110us Notebook PC,

For additional questions please post in a Comment.

Nov 15, 2010 | HP Compaq Presario CQ50-110US Laptop

1 Answer

There is no picture just sound.

Take a flash light and shine it from he back of the unit to see if a picture is actually present. If you see a picture in the background then the lamps are not being lit by the inverter board, Replacing the inverter board will solve the problem. Also have the voltage from the power supply to the inverter checked to make sure the power supply is functioning correctly.

Mar 03, 2010 | Televison & Video

1 Answer

I have a black and decker inverter type 1 400

First, you should be aware that the exact inverter is available for under 40 dollars all over the US. Your model is sold under several names - check out .

I suspect that your INPUT power level is not adequate for the inverter to put out the 200W that the 150W charger needs. If you have low current and low voltage - then the inverter can only put out a proportionally smaller AC wattage level. You may also have a faulty voltage the input. Once the inverter sees a low level (even momentarily), it alarms and shuts down the output until the unit is reset (turned off/back on)

Dec 28, 2009 | Black & Decker 1000w Power Inverter

1 Answer

User hears faint static while on a call. It's not load enough to make it hard to hear the caller, but a noticable crackling/static noise can be heard in the background. happens on every call.

Cell phones transmit the sound as digital data. The data when converted back to analog to listen too CAN have "digitizing noise" which will sound like static.

WORSENING the problem is if there is noise in the background of the person sending the voice and the worst possiblle is to have MUSIC in the background. These both drive the CODEC (the analog conversion system) crazy and will create what you describe. The CODEC is designed to transmit ONLY voice.

Oct 23, 2009 | Motorola Mobility Moto Q

1 Answer

Audios fine but picture is black

Hello taasmost9, This problem indicates an issue with the inverter which operates the backlight. It appears that your inverter is malfunctioning. If you have a background in electronics, it is possible for you to repair this yourself if not you will do more damage then good so I would like to suggest that if you do not have a background in electronics that you have a qualified TV technician work on and repair this problem. If you do have a background in electronics you will need to measure the voltages at the inverter and determine that power id present at the inverter's input and at the output to the backlight. You will need a schematic and a multimeter for this task. After finding the component you have a choice of replacing the component or replacing the entire inverter module (this is up to you depending on the cost of each procedure). I hope this helps, Thank you, Shuttle83

Jun 14, 2009 | Samsung Televison & Video

2 Answers

Dell Vostro 1710 display problem

Hello My Dell Vostro Laptop Display Not Working Correctly it showing Dim but in other desktop when i connect to the Laptop Of Mine it showing Correctly With No Dim Problems? How can I fix the Problem?

Nov 19, 2008 | Dell Vostro 1500 Notebook

1 Answer

T-629 Background Static/They can't hear me

You had a bad speaker and need to be replaced

Dec 04, 2007 | Samsung SGH-t629 Cellular Phone

2 Answers

Background static

1. How old are you phone lines in the house?  Check the "main" terminal connections.  Clean and reconnect.  (Make note how the wires are connected).

2. The power transformers for the phones maybe you trouble also. Unplug all except the main unit.   Check each transfer one at a time. Do you have static?  One or more may be your problem.  Replace the bad ones if needed.

Oct 04, 2007 | Uniden TRU8885-3HS Digital Cordless Phone

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