Don't Miss

TIP3055 is Bad

By on August 26, 2008

If you have read my previous post about getting the TIP3055 as substitution, i guess you have to put on hold for this replacement. Read from this member feedback about using the TIP3055 as substitution for C5707 transistor

“The TIP3055 is not a safe subsitute for the 2sc5707. It will work, but runs extremely hot, and will eventually catch fire unless adequately cooled in the vast majority of CCFL inverter circuits that it will operate in. There’s a reason why cheap general purpose transistors don’t wind up being used in place of specialised models, and it’s reasonable to say that “fire hazard” is one of them!”

Since he already tested on this transistor, i guess the best for you is still to get the original part number. If you would like to order online for this C5707 transistor then please visit Bluestar Online dot com.



  1. Erick

    August 19, 2009 at 4:18 am

    Hello Jestine,

    I read your previous post about getting the TIP3055 as a substitute for the c5707 transistor. Since I couldnt find the original part, i decided to give it a try to the TIP3055.

    It is significantly bigger, And yes, it gets hot. However, i decided to attach the transistors to a "Disipador" (sorry i dont know the english word) and it worked really well. This is a picture of a "Disipador":
    The one i used is much smaller, no need to be very big. Since the internals of the monitor have plenty of empty space, there is not a problem to fit it somewhere.

    The monitor a E173Fpb 17", has behaved very well. I decided to test it using it non stop for a long time and it hasn't presented any issues.

    Now i am struggling with a E177FPb that presents a white screen problem, and the board is very different to the rest of the series. if you have any tips, they will ve very welcome.


    BTW: Thanx to you i have fixed already 3 LCD monitors!

  2. Erick

    August 19, 2009 at 6:56 am


    Its a good idea to replace the transistors with the original ones as soon as one has the chance. Dont forget that.

    Also, Please if you have the Schematics for the Power board of E177FPB (This one: ) please let me know where can i get them.

    Thanx! 🙂

  3. admin

    August 21, 2009 at 9:58 pm

    Hi Erick,

    Sorry i do not have that model schematic.


  4. admin

    August 21, 2009 at 10:01 pm

    Hi Erick,

    Thanks for sharing. That heatsink really helps! As for the white screen, if you found that all the voltages and signal are going to the lcd controller board then most likely the lcd panel have problem. I came across few of this model that have white screen and replacement of lcd panel solved the problem!


  5. Erick

    August 22, 2009 at 4:47 am

    You are completely right Jestine!

    This baby is now working! Brought back to life. 🙂
    I tested all voltages from the power board as well as the
    Video board (BenQ), and everything was fine, i was giving up hope.

    I found that the faulty component is the 5V1 in the lcd board.
    Replaced it with one from another fried lcd board and its now ready
    to go. The board model is M170EGO1. Thanks for your help.

    Count one more LCD fix for me. 🙂 4, so far.

    I have pictures of the repaired monitors and components if you need pictures for your website. In case you need.

    And sorry for my bad english.

  6. Erick

    August 22, 2009 at 4:53 am

    Oh, one pore thing for the people that needs help with this:

    The 5v1 component of the M170EGO1 VA lcd board (in a E177FPB lcd monitor), is really close to the signal Connector, maybe 1/3 inch, in case you cant locate it first 3 pins are connected to it.

    Since its a really small component, you need to be very careful while
    soldering this one.

    Careful with that! 🙂

  7. admin

    August 24, 2009 at 8:49 pm

    HI Erick,

    Congratulation and keep up the good work! As for the picture-is ok and your English is good.


  8. Ganesh

    March 17, 2011 at 1:21 am

    can i use MJE3500 in place of TIP3055 for an inverter circuit.

  9. admin

    March 20, 2011 at 11:08 am

    HI Ganesh,

    Sorry i do not have the mje3500 data thus i could not suggest any number to you.


  10. Amir Mukhtar

    March 20, 2011 at 4:18 pm

    Dear guys
    I agree with Sir jestine about above article conclusion. But, one problem always comes like: to arrange an original part with device equal.
    Actually, some times original part is very hard to get from market then on that time equivalent part becomes an important solution.

    So therefore, i share my experience about useful component if C5707 is not getting easily.

    Actually, 2SC5707 is a 15 ampere / 100 volts / high switching component. so, Equivalent will be 2SA2040 silicon transistor. Its 15W watt and 150 degree Celsius transistor.
    every one can use.

    thanks you
    Amir mukhtar

  11. admin

    March 21, 2011 at 4:11 am

    Hi Amir,

    The 2SC5707 IS A NPN transistor but the 2SA2040 is a PNP transistor.


  12. Voyager

    January 14, 2012 at 5:21 am

    Well I have replaced C5707 with TIP3055 and now I'm afraid for the possible fire hazard because I didn't saw that other article before..

    I just can wait for the owner to come and tell me bad news 🙁

  13. admin

    January 14, 2012 at 8:46 am

    HI Voyager,

    If you want to have a piece of mind i suggest that you call up the customer and telling him that you have found the original part and the monitor will last longer.



Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.