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SCR Tester

By on June 16, 2010

This month repair newsletter was about building your own SCR/Triac tester and one of my ERG members Mr Beh from Iran had completed and fully tested the SCR/Triac Tester- This is what he wrote “HI JESTIN for sure you can share it in blog. As i told you i had an old scr tester but this one that i made according your diagram is much better than that one thanks again


scr tester



  1. beh

    June 16, 2010 at 6:40 am


    you have to send me a prize because i am the one can made your diagram
    awaiting prize

  2. admin

    June 16, 2010 at 11:29 am

    HI beh,

    Thanks. Actually there was another guy that had built the tester on the next day after i sent out the repair newsletter but i did not ask for the photo.


  3. beh

    June 16, 2010 at 12:02 pm

    this does not change any thing in any case i am the first one that complete the tester and for prof i sent the picture to you.
    i love malezia so much and i love malezian handicraft very much

  4. Waleed

    June 17, 2010 at 2:21 am

    that is know what is it would someone can build a backlight tester so we do not have to guess all the time that the back light is working or not..I know there are a lot of backlight testers in the market but to me, they are expensive and shipping to Jerusalem is even more expensive..

  5. admin

    June 17, 2010 at 6:16 am

    HI Beh,

    Actually there are more handicraft items at the eastern side of Malaysia. May be in the near future i will hold some contest then only i will give prizes away.


  6. admin

    June 17, 2010 at 6:18 am

    HI Waleed,

    At the moment I'm preparing an article about backlight tester sent by an ERG member. Hope i will send it out soon.


  7. beh

    June 17, 2010 at 2:16 pm

    ok i will accept also eastern kind handicrafts as well as other parts
    also i will participate in any contests that the prizes are malezian handicrafts .i am ready to go

  8. zed

    June 18, 2010 at 12:06 am

    Hi sir jestine,

    That's what im waiting for and maybe all the ERG Member how to make backlight tester. We hope to here from you soon about this tester and we are excited.God bless you more for your generosity in sharing all your knowledge to us.


  9. admin

    June 18, 2010 at 1:47 am

    Hi Zed,

    The article contributed by the ERG member did not place in the schematic. It just explain the proper way to test the ccfl. Actually I'm still looking for any schematic that show how to built the tester. By the way may i know what is your blog website?


  10. zed

    June 18, 2010 at 4:14 am

    my blog but right now i am not writing any article. i am only posting some helpful website and featuring some new test equipment like the new esr digital meter from quebec canada which they sell in ebay. I remember that sir john preher when you his lcd tv repair video that his backlight tester comes from portable dvd unit. i am right?

  11. admin

    June 18, 2010 at 10:19 am

    HI Zed,

    I guess your website should not put in the "www" because you are using blogspot. As for john preher backlight tester i have no idea that it came from dvd portable unit. You mean that one can salvage the dvd portable unit to make one backlight tester?


  12. zed

    June 19, 2010 at 2:37 am

    hi sir jestine,

    how should i do that sir that i will not put my blog to www. i am new only in this field. may be we can review the video of sir john. i remember he said that his tester for backlight comes from dvd portable. i dont know if it is from inverter of dvd if it has one. God bless you sir.


  13. admin

    June 19, 2010 at 8:38 am

    HI Zed,

    You just type in As for the tester may be i need to view the video again.


  14. Kent Williamson

    July 21, 2010 at 11:53 am

    well I hope this is not the odd question of the day. i deal in motive power applications and have been perplexed by some smaller block style SCR diodes. i have not been able to figure out where the leads go. Sad, i know! please anyone help. thanks Kent

  15. admin

    July 21, 2010 at 10:13 pm

    Hi Kent,

    First you need to read the part number of the SCR then locate the datasheet from the internet. From there you will know which pin is Anode, Cathode and Gate.


  16. John Preher

    July 22, 2010 at 7:00 pm

    The CCFL tester in my video is from a portable DVD player. The DVD player used a single CCFL side light and a light guide and difussers to illuminate the entire LCD panel. The inverter is very simple and requires no on/off signal or reference voltage only 9V-12V DC.It has Vcc and GND on power supply input connector. It will work to test lamps in up to 32" TV, anything larger and it does not light the entire length of the lamp. I am working on a design for a kit we can all make easily right now, it is a flyback circuit, very similar to the inverter circuit from the portable DVD player and uses common parts like 555ic and RF510 just working out the final bugs and I will post it with a schematic and parts list on my blog and probably put it in next months news letter so hold tight everyone. If anyone would like to collaborate on the design just email me and this can be a team effort. Best wishes everyone.

  17. admin

    July 23, 2010 at 5:26 am

    HI John,

    Thanks for the update news!



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