Mad Of Science

This was the message I got few months ago whenever I started my PC , sometimes suddenly my PC will go off and When I restart again the same message appeared.

I thought I would have over used my Computer but thats not the problem I know, because system can be used continuously throughout the day .

I removed the cooling fan and heat sink placed directly above the processor and cleaned it.

Fan was working good, heat sink was cleaned and now its free from dust. I cleaned the heat sink with cycle pump. Now assembled everything back in to its position . Again I got the same message .

This time I removed CPU fan , heat sink also the processor beneath.

It was difficult to remove the processor, the heat sink compound was dried and it was difficult to remove the processor.

Heat sink compound is a white paste like substance applied over the processor and at the bottom of the heat sink. It is mainly used for cooling and can be obtained at local shop.

I bought a new compound and applied it . But when started my PC it ran good for a while again it stopped, showing the same message.

Now I removed all the wire connections from SMPS and checked the wires . Finally I found the culprit.

It was a four pin from the SMPS yellow, black wire i.e, 12v wire. The wire end was blackened.I opened the SMPS and rectified the fault now My system is working fine.

In my previous post I shared my experience about my UPS now I have two more devices to share with you all. One thing is Electronic Choke and the other Emergency lamp.

Electronic Fluorescent lamp choke:

I got a tube light with no response ,from one of my customer .His doubt was lightning. I opened the electronic choke and his doubt was right it was affected by lightning. I just had a look at the PCB, line to a small transformer inside was burnt .


I just gave a parallel connection to it using a small bit of wire. I checked each and every component inside and everything works fine. After connecting the choke I switched on and the tube light glows.

Emergency lamp:

Another case was with an emergency lamp which is plugged in while charging and was affected by lightning .


The green light was not glowing that is battery is not charging but it can discharge . The lamp glows with the residue charge present in the battery.

After opening the lamp having a look at the PCB found a hole in the PCB , might have got a severe volt. Fortunately everything was fine I checked each and every component . Now as usual I traced the line and gave a parallel line to the small transformer whose circuit was burnt.


Now i plugged in and switched on the lamp ,the green light glows and the battery is charging . Every thing works fine.

Like many other guys me too very much interested towards electronics and I like troubleshooting them. Here I am going to share some of my experience regarding electronic gadgets affected by lightning .

Normally a device gets affected by lightning when its power chord is just plugged in , doesn't matter its switched on or not, just a plugged chord is enough to get affected by lightning.


First thing I am going to share is about my UPS

UPS:

One night I left my UPS plugged in , but power is switched off . I went to sleep , around midnight I heard a loud bang like how a glass piece dropped down will make shattering sound. I woke up and ran towards my PC and TV thought one of my picture tube would have burst. Luckily both was safe , I happily went to sleep without knowing the whats waiting for me the next day , next morning when I switched on my PC, UPS has no response and at that time I recalled what happened last night.




Opened my UPS, removed PCB board , what I saw was along the border of PCB the ground line was burnt and lost two diodes, which I found later after testing with Multimeter.

I just tracked down the line of PCB and just soldered a piece of wire instead of that line and replaced those diodes. Now it works fine .


I have seen some more devices affected by lightning .In my experience ,when compared to other faults lightning causes PCB burning normally it doesn't spoils any components.

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1. Hunger remains the No.1 cause of death in the world. Aids, Cancer etc. follow. 2. There are 820 million chronically hungry people in the world. 3. 1/3rd of the world’s hungry live in India. 4. 836 million Indians survive on less than Rs. 20 (less than half-a-dollar) a day. 5. Over 20 crore Indians will sleep hungry tonight. 6. 10 million people die every year of chronic hunger and hunger-related diseases. Only eight percent are the victims of hunger caused by high-profile earthquakes, floods, droughts and wars. 7. India has 212 million undernourished people – only marginally below the 215 million estimated for 1990–92. 8. 99% of the 1000 Adivasi households from 40 villages in the two states, who comprised the total sample, experienced chronic hunger (unable to get two square meals, or at least one square meal and one poor/partial meal, on even one day in the week prior to the survey). Almost as many (24.1 per cent) had lived in conditions of semi-starvation during the previous month. 9. Over 7000 Indians die of hunger every day. 10. Over 25 lakh Indians die of hunger every year. 11. Despite substantial improvement in health since independence and a growth rate of 8 percent in recent years, under-nutrition remains a silent emergency in India, with almost 50 percent of Indian children underweight and more than 70 percent of the women and children with serious nutritional deficiencies as anemia. 12. The 1998 – 99 Indian survey shows 57 percent of the children aged 0 – 3 years to be either severely or moderately stunted and/or underweight. 13. During 2006 – 2007, malnutrition contributed to seven million Indian children dying, nearly two million before the age of one. 14. 30% of newborn are of low birth weight, 56% of married women are anaemic and 79% of children age 6-35 months are anaemic. 15. The number of hungry people in India is always more than the number of people below official poverty line (while around 37% of rural households were below the poverty line in 1993-94, 80% of households suffered under nutrition).

Sources :

UN World Food Programme

UN World Health Organization: Global Database on Child Growth and Malnutrition, 2006

UN Food and Agriculture Organization: SOFI 2006 Report

National Commission for Enterprises in the Unorganized Sector (India)

National Family Health Survey 2005 – 06 (NFHS-3) (India)

Centre for Environment and Food Security (India)

Rural 21 (India)

A crystal radio is the distilled essence of a radio. It has very few parts, it needs no batteries or other power source, and it can be built in a short time out of things you can find around the house.

The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear. The ear is extremely sensitive to very faint sounds. The crystal radio uses only the energy of the radio waves sent by radio transmitters. These radio transmitters send out enormous amounts of energy (tens of thousands of watts). However, because they are usually far away, and we have at most a few hundred feet of wire for an antenna, the amount of energy we receive with the crystal radio is measured in billionths of a watt. The human ear can detect sounds that are less than a millionth of even that.

The above circuit shows a simple crystal radio. U can also add some capacitors to the above circuit, a capacitor in series with the antenna coil allows high frequency to pass through enabling better performance and reception.

Instead of ear phone u can also use a telephone receiver to listen to channels.

Hi friends ,


I am new to blogging and this is my first blog for me kindly adjust me for any mistakes , here i have an idea of sharing some thoughts related to electronics appliance repair and troubleshooting guides. As most of the new generation guys are very much interested in exploring electronic gadgets and trying to repair themselves .

Following are some of the links which i want to share , which will be very much useful .
I found those sites very useful whenever i was in need , i have repaired some devices like PC SMPS , some radio , set top box and power supply etc . people who are eager in learning repairing tips will find it useful .

http://www.repairfaq.org/

http://www.repairfaq.org/REPAIR/F_smpsfaq.html

http://ourworld.compuserve.com/homepages/Bill_Bowden/homepage.htm

http://www.electronicrepairguide.com/


Thank u for reading my blog with patience and please post your comments so that i may improve my self also inform me about additional detail you want to know i will try my level best to bring it for u.