Cheating in components

always buy good branded capacitors, bcs you see in the picture.

Important Notice to readers.

Dear Reader,

I will be posting all the electronic articles in this blog only. No where else.

Thanks for the cooperation.Please book mark this blog for future visits.

Admin

Power supply2 :Switching transistor or STR over heats or blows up again and again

Check swicthing transistor or STR heatsinks also mica sheets. Check diodes and other bulged capacitors near STR or transistor. Replace dought full capacitors. Check for the dry solder in SM transformer.Also in rare cases the SM transformer.

Powersupply-1:Set Dead, AC fuse Blows up again and again

Check the main plug point care fully for any shorts, on - off switch , The main reason for this is bad bridge rectifier. Check all the diodes for shorts. If any one one is damaged please replace all the four diodes. In some P/S (Power supply) an IC is used for rectification. Where 2 pins for AC input and 2 pins for DC output.Also check for variactor. Its shape is similar to the pf capacitor having blue color.

Also check for the PTC with is connected to degaussing coil.also some time shorted line filter will cause this problem. As you know you need to check switching transistor or STR may be faulty.

After repalcing faulty item donot switch on the PS directly. Use the bulb as series connection.

(To understand this process please refer my previous postings). At any cost do not replace fuse with wire.

Also before doing any cold test to PS please discharge main filter.

(To understand this process please refer my previous postings).

First Let us start from SMPS

Dear Friends,

Any TV in-order to function properly it needs regulated power supply (That too regulated) for all the remaining sections like vertical section, audio section etc. Regulated means a constant steady voltage irrespective of fluctuation happening in the main electricity.

For example even if mains wire recieves 10 v less to the actual the smps should produce stable voltage. There are many plans for SMPS to design. One may use STR , one may use transistor.

Nevertheless the plan is different the intention will be common.That is producing regulated voltage.

It is difficult to have all the diagram all the time. So it is very important to have a general trouble shooting idea.

After refering 50-60 books and 8 yrs experience I have designed a general troubleshooting tricks.

So, my next posting on http://ecare-electronics.blogspot.com/ is general tricks of SMPS repair.

Please give me 3 hrs of time I am going for lunch now.

Regards

Raghavendra

Continue postings in the blog it self

Dear Reader,

As many blog readers have shown more interest in the blog

http://ecare-electronics.blogspot.com/

and asked me to continue postings in the blog it self , I am continuing the blogging here it self

and for your information yesterday this blog got a record number of readers.

From tomorrow I am going to put articles for stage - by -stage trouble shooting of TV in this blog itself.

Please wait.

Started a magazine.

Dear Reader,

I have started a IT magazine, "The Software Mail" in Mysore, India. This was my aim from 2 years.

- Thanks