Help To Identify SMD IC - Electronic Circuits Projects Diagrams Free

rmn_tech · 14th March 2009, 11:29 AM

Hi once again I am hoping for some help.

In my other thread I was asking for help to obtain a BM2576 type switching regulator from a LCD TV I have a PCB removed from another set with the following chip on board.

To make things simpler I enclose a Drawing of the chip. The chip is the same size and shape as the SMD BM2576 shown on the datasheet included with my other post.

I know this means nothing I just thought you might like something for comparison.

Thanking you again.

hotwaterwizard · 14th March 2009, 06:18 PM

http://www.bookly.com/images/BM2576.pdf

rmn_tech · 15th March 2009, 02:03 PM

Thanks for your reply Hotwaterwizard.

I have the Datasheet for the BM2576. However I don't know if this is an Equivalent or a completely different chip, as it is in the PSU section of a PCB from an unidentified LCD TV.

hotwaterwizard · 15th March 2009, 07:03 PM

That does not mean they are the same. Just the same case style.

hotwaterwizard · 15th March 2009, 07:46 PM

Well after some research the SK means Sanken is the Manufacture of the IC and it could be a special application designed IC for the TV Manufacture.

SANKEN ELECTRIC : ICs : SMPS Power ICs For Non-isolated SMPS(Custom)

R.C.Chopper STR50000 Series

There series of ICs are custom or application specific products

hotwaterwizard · 15th March 2009, 08:33 PM

Ok if you need more help, Lets see if we can find a schematic of this LCD TV .
What is the Manufacture, Model number, and Serial Number?

rmn_tech · 16th March 2009, 11:08 AM

Hi the TV is a Technosonic LCD5015

I have no diagram but I have found that there is a 4v square wave at the output of the BM2576 (I have now found out that this is also a LM2576 thanks to other forum members)

However without the diagram I am not sure if the square wave is coming from the chip or is being superimposed on the 5v line from elseware.

The set shows a picture for about 1 - 2 seconds then the picture dies The sound is not affected. There is a 5v feed to the backlight inverter board and this dies at the same time as the picture. This 5v supply is very noisy though not with a square wave.

Thanks again for your interest.

rmn_tech · 20th March 2009, 08:21 AM

I take it that you had as much luck as me in finding a schematic for this set.

No luck at all.

**Nigel Goodwin** · 20th March 2009, 10:14 AM

Quote:

Originally Posted by rmn_tech

I take it that you had as much luck as me in finding a schematic for this set.

No luck at all.

Your problem is not knowing what make the set actually is, Technosonic is just a badge on cheap crap, so you've no way of finding out who makes it.

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14th March 2009, 11:29 AM	#1
rmn_tech	Help To Identify SMD IC Hi once again I am hoping for some help. In my other thread I was asking for help to obtain a BM2576 type switching regulator from a LCD TV I have a PCB removed from another set with the following chip on board. To make things simpler I enclose a Drawing of the chip. The chip is the same size and shape as the SMD BM2576 shown on the datasheet included with my other post. I know this means nothing I just thought you might like something for comparison. Thanking you again. Attached Thumbnails __________________ I think, therefore I am. Therefore I must be !!! I think ??? Last edited by rmn_tech; 14th March 2009 at 11:30 AM.

14th March 2009, 06:18 PM	#2
hotwaterwizard	http://www.bookly.com/images/BM2576.pdf __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

15th March 2009, 02:03 PM	#3
rmn_tech	Thanks for your reply Hotwaterwizard. I have the Datasheet for the BM2576. However I don't know if this is an Equivalent or a completely different chip, as it is in the PSU section of a PCB from an unidentified LCD TV. __________________ I think, therefore I am. Therefore I must be !!! I think ???

15th March 2009, 07:03 PM	#4
hotwaterwizard	That does not mean they are the same. Just the same case style. __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

15th March 2009, 07:46 PM	#5
hotwaterwizard	Well after some research the SK means Sanken is the Manufacture of the IC and it could be a special application designed IC for the TV Manufacture. SANKEN ELECTRIC : ICs : SMPS Power ICs For Non-isolated SMPS(Custom) R.C.Chopper STR50000 Series There series of ICs are custom or application specific products Attached Thumbnails __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com Last edited by hotwaterwizard; 15th March 2009 at 07:57 PM.

15th March 2009, 08:33 PM	#6
hotwaterwizard	Ok if you need more help, Lets see if we can find a schematic of this LCD TV . What is the Manufacture, Model number, and Serial Number? __________________ John DeRosa (Hotwaterwizard) hotwaterwizard@aol.com

16th March 2009, 11:08 AM	#7
rmn_tech	Hi the TV is a Technosonic LCD5015 I have no diagram but I have found that there is a 4v square wave at the output of the BM2576 (I have now found out that this is also a LM2576 thanks to other forum members) However without the diagram I am not sure if the square wave is coming from the chip or is being superimposed on the 5v line from elseware. The set shows a picture for about 1 - 2 seconds then the picture dies The sound is not affected. There is a 5v feed to the backlight inverter board and this dies at the same time as the picture. This 5v supply is very noisy though not with a square wave. Thanks again for your interest. __________________ I think, therefore I am. Therefore I must be !!! I think ???

20th March 2009, 08:21 AM	#8
rmn_tech	I take it that you had as much luck as me in finding a schematic for this set. No luck at all. __________________ I think, therefore I am. Therefore I must be !!! I think ???