Transistor C5707 Equivalent Part Number
I got lots of emails asked about the substitution part number for C5707 transistor that were used in many LCD Monitors. I normally asked them to buy online as original part number is still the best part for replacement as it is not easy to get a replacement for this transistor. For your information if you have the C5706 transistors you can replace it with C5707 and i have tested it and the LCD Monitor worked perfectly okay. To some that can’t order the parts online and can’t get it from local electronic suppliers, in fact you can try this part number as replacement.
Try use TIP3055 transistor as recently i came across a website that says that it can be use for replacement for C5707. The TIP3055 is bigger in size compare to C5707 but with some adjustment you could easily fit into the board. However i haven’t try it before because i could get the C5707 from the local market. Try it and please let me know about the result. By the way you can download the C5707 transistor data or specification from this website-please click HERE.
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TIP3055 is bad!
August 26, 2008 at 5:13 am
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!
admin
August 26, 2008 at 11:16 am
Thanks for sharing!
Jestine
Arturo
May 22, 2009 at 6:46 am
An exact replacement for the 2SC5707 is the NTE2668. I check a batch and all have high Hfe and works.
Arturo.
admin
May 25, 2009 at 9:22 pm
HI Arturo,
Thanks for the info. May i know what part number is the NTE2668?
Jestine
kofi
July 21, 2009 at 5:44 pm
my dell tft the signal display is flicking ,what is cause.
admin
July 22, 2009 at 7:25 pm
Hi Kofi,
Is the output voltages stable?
Jestine
nishad
November 25, 2009 at 11:48 am
hello sir,
i m facing problem with ghanz 19" lcd. c5706 transisters r blowing as soon as i replace them what could be the fault please guide me
admin
November 25, 2009 at 8:53 pm
HI Nishad,
I guess you need to check the corresponding components first before put in a new transistor and On. It may be a bad cap that had caused the transistor to blow again.
Jestine
Arvie
November 30, 2009 at 2:07 pm
even though that the other transistors are c5706? i can safely use c5706 with c5707? coz on AOC LCD monitor, there 4 c5706 transistors, unfortunately, one of those transistors burned and i can't find any c5706 transistors here in our area.
is it safe to use c5707 transistor in replacement for just one defective c5706 transistor? thanks.
admin
December 1, 2009 at 8:07 am
HI Arvie,
Yes, i have used that replacement (c5707) for many of the repair. It has higher spec than the c5706.
Jestine
OnNplay
December 15, 2009 at 3:00 am
Where to buy at SIM LIM Tower or which exactly shop selling C5706.
admin
December 15, 2009 at 8:19 am
Hi Onplay,
Sorry i have no idea which shop you should buy because I'm not from Singapore. However, you can ask around from those electronics shops.
Jestine
girma asefa
December 17, 2009 at 7:26 am
pls send me equivalent of c5707& c5706
thanks
admin
December 21, 2009 at 12:49 am
HI Girma,
The best is to get back original part number.
Jestine
Allan
February 23, 2010 at 10:09 am
HI
I had this problem with dell monitor (E173Fpb) it was the blinking power light, i replaced the 4 C5707 transistors with C5706 that i found from an old working monitor, it worked for a while, and after two days, the same problem returned. After testing the transistors i realized that the were damaged. What you think could of been the problem?
Thanks
Allan
admin
February 24, 2010 at 5:15 am
HI Allan,
You can't use c5706 as replacement because the spec for c5707 is higher. Check also for dry joints in the high voltage transformer pin, bad ecaps or even bad tuning cap.
Jestine
Allan
February 25, 2010 at 11:55 am
HI
Thanks for the advice.
I had thought that,that was the problem. After getting hold of the data sheets for bothe the C5706 and C5707 i realized the specs were different. I had also checked for dry joints, as well as all the caps, all checked out.Because the monitor worked for awhile, that tells me it's just the Transistors that needs to be replaced.
Thanks very much
Allan
admin
February 25, 2010 at 8:37 pm
HI Allan,
You are welcome!
Jestine
Mark
March 3, 2010 at 3:15 pm
HI Jestine
Sometime ago I purchase a new version of dell monitor, the 19" S1909WX. It worked for a while, but now i keep getting this problem, every time i power it on, it would stay on for a short while, about 5 seconds, then would go black, a few minutes and it would come on and then do the same thing.
This inverter board is not like the older dells, there are no C5707 transistors, there are however 2 N channel powered mofets, could these be causing the problem? I've checked all the caps, they're all good, I've also looked for cold solder joints and re soldered the transformers and everything i could.
What's next?
Thanks in advance
Could i send u a pic of the inverter board?
Mark
admin
March 4, 2010 at 11:02 am
HI Mark,
Is the supply voltage to the inverter IC stable when it shutdown? If it not stable then suspect a bad mainboard especially the MCU. I came across quite a number of MCU problem in Samsung that have the same symptom with your monitor.
Jestine
abdulsamadh
March 7, 2010 at 9:05 am
our lcd monitor power supply section transistor sc5707 was failed .so what is the correct replacment of this transistor
admin
March 8, 2010 at 4:07 am
HI Abdul,
The best is to use the original part number for reliability purposes.
Jestine
priyantha
April 3, 2010 at 3:15 pm
HI, thanks for your website. I think you will help me to fix my tv 14''. (SILVER) model nomberST-14S35. this is the problem. only blue color and missin some colour like red,brown etc.but programe menu have coulor.I change IC LAxxxxx but no result.
please need help.thank you.
admin
April 4, 2010 at 1:57 am
HI PRIYANTHA,
Try compare the red and the green signals with the Blue color section in term of voltage and waveform in the CRT board. Any changes from the test would give you a clue where you should start to troubleshoot. Sometimes a corrupted EEprom data may give this kind of problem too.
Jestine
dadan
April 17, 2010 at 12:40 am
hi All,
do you know where can i find the price for 2SC2922 with cheapest price?
thanks
Dadan
admin
April 17, 2010 at 9:11 am
Hi Dadan,
Sorry no info on that.
Jestine
rey
April 27, 2010 at 4:56 am
sir i also have the same problem with c5707,,,can you share tome what replacement part value for c5707?thanks
admin
April 27, 2010 at 9:31 am
HI Rey,
As written in the post, you may try tip3055 as replacement.
Jestine
ROBERT CROSSAN
June 4, 2010 at 1:33 am
2SA2907A?replacements
admin
June 4, 2010 at 1:54 am
Hi Robert,
Sorry no info on that because my databook is until 2SA2063
Jestine
Rick
June 5, 2010 at 5:29 pm
Have you tried the NTE2668 from NTE?
admin
June 7, 2010 at 4:52 am
Hi Rick,
What is the part number of the NTE2668?
Jestine
Rick
June 8, 2010 at 2:16 pm
The part # is NTE2668. Here's where I found it:
http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/69d5aa3584d015ce85256e780056e56f?CreateDocument
In the US, I can get it from Mouser:
http://mouser.com/Search/ProductDetail.aspx?R=NTE2668virtualkey52600000virtualkey526-NTE2668
Rick
June 8, 2010 at 2:22 pm
It looks like one of those links doesn't work. Just go to their home page and use the component cross reference.
http://www.nteinc.com/
Rick
June 22, 2010 at 10:44 am
I replace two of the c5707 with the NTE2668 and have been using the monitor for two days without any problems. I didn't check for excessive heat like the TIP3055 before I assemble the monitor, but I notice no excessive heat coming from the top vents in the monitor. I'll let you know if any problems arise in the future, but to me this looks like a good fix.
admin
June 22, 2010 at 9:20 pm
HI Rick,
Thanks for sharing and I'm sure the readers will be glad to hear about the result.
Jestine
Giorgio
July 9, 2010 at 12:52 pm
Hi All, you say you have replaced the C5706 on an LCD Monitor. Was the fault that the screen it would come on normally but after 2-3 secs would go black and at the same time the backlight would also go off? I have this fault on my Siemens Fujitsu Scenicview B15-1A. Have checked all other components and seem OK. Have replaced all capacitors just in case still no joy. There are signs of resistor overheating in the vicinity and a comparison "diode check" check on the four C5706 has revealed different values on two of the four, so maybe they are the culprits? Your help much appreciated.
Regards Giorgio
admin
July 9, 2010 at 9:38 pm
Hi Giorgio,
Actually the cause of display shutdown could be from many reasons. One of the main reasons was the transistor shorted and backlight have problem. If you know how to test a transistor and found that the reading was different from the good one then you can presume that the transistor have problem. If all transistors check to be okay then suspect one of the backlight have problem.
Jestine
yohannan
July 24, 2010 at 6:18 am
i want equivalent no of 2n3439 transistor
Val
July 25, 2010 at 7:05 pm
Hi there
Thanks a lot for pointing out possible issues.
Now, for these living in Montreal there are good news: ABRA electronics have helped me to find an almost the same equivalent for 2sc5707
In their catalog we found that NTE2668 is a best one.
Small difference at high frequency (but who cares if it at 200MHz ??)
For others check NTE site at http://www.nteinc.com/
Hope this helps as it had for me
Cheers
admin
July 26, 2010 at 7:54 am
HI Val,
Thanks for sharing!
Jestine
admin
July 28, 2010 at 4:55 am
Hi Yohanan,
The equivalent number that i got from my databook are BUX55, BUY59, BUY60 and 2N5095
Jestine
CHANA T.S.
September 1, 2010 at 4:07 am
Thanks for the info. This site is haven for electronics engg.
Jeff
September 24, 2010 at 1:00 am
Hi - I've got an HP 1702 with the same power shutdown problem. The 4 transistors are labelled D1691 and I can't find any supplier or cross reference to them anywhere. Can you or anyone help me?
admin
September 24, 2010 at 3:51 am
HI Jeff,
There are few version fr this model. I have not seen this part number in the board before. According to my databook a D1691 equivalent part number is 2SD826.
Jestine
Curt
September 29, 2010 at 9:58 am
This worked great for me. I just finished my first lcd repair. Had the C5707's in it but replaced with C5706 no problem.
Curt
Abebe
January 28, 2011 at 10:24 am
Hi Jestine how are u ?
happy to get your site
I have hp1702 flat screen monitor ,it start for a few second and goes blank the green lcd keeping on ,sometimes the turn of frequency is high
I saw if there any bad capacitor ,but all are fine , I need your help
thank you in advance
abebe
admin
January 29, 2011 at 11:10 pm
HI Abebe,
May i know what do you mean od turn of frequency is high? If it shutdown after few seconds, make sure the output voltages are good and stable, no dry joints in the high voltage transformer and check the backlight too because if one of the backlight have problem it will shutdown.
Jestine
suparno
January 30, 2011 at 4:25 am
heloo my friend I need tabel equivalent TR 2N6678 for swtching pwrsply & equivalent tabel IC SL1626 for AGC Amplifier...txs
admin
January 31, 2011 at 4:33 am
Hi Suparno,
Sorry i do not have those information.
Jestine