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smpsdiyer
03-12-2020, 10:36 PM
Hi All,

This is my 1st post and I apologize if it is in a wrong section. Please feel free to delete or move to the right section.

I have a 9W LED bulb and it has a transistor like SOT92 IC marked as 51LP and beneath it marking F48, which is blown up.
I want to repair this and coudln't find the part nor a datasheet to see if possible to find a substitue.

Attached are few shots.

Thanks

Silvio
03-13-2020, 06:14 AM
I am not sure about this but it could be TL751LP. This is a low dropout voltage regulator

here is the link for the datasheet https://www.alldatasheet.com/datasheet-pdf/pdf/28831/TI/TL751LP.html

Regards Silvio

smpsdiyer
03-13-2020, 08:06 AM
Hi Master Silvio,

Many thanks for your reply and the link.


I am not sure about this but it could be TL751LP. This is a low dropout voltage regulator

here is the link for the datasheet https://www.alldatasheet.com/datasheet-pdf/pdf/28831/TI/TL751LP.html

Regards Silvio

I got the pdf and as per page 2 the "ORDERING INFORMATION" table and the "TOP-SIDE MARKING" column, it does not include any matching markings for "51LP F48" as per the listed/below:

TL750L05C
50L05C
51L05C
750L05C
TL750L05C
50L08C
750L08C
TL751L10C
50L10C
51L10C
750L10C
50L12C
51L12C
750L12C

Since you are a master and this driver circuitry confuses me, then I need to ask isn't this circuit a buck converter so it needs a pwm ic?

I managed to find a datasheet but its in chinese and hope it helps.

http://www.radioradar.net/en/datasheets_search/Y/X/8/YX8122-ETC.pdf.html


Much appreciated.

Silvio
03-13-2020, 09:29 PM
There exist a 3 legged chip such as the TOP family like TOP221 which is used as a flyback buck converter. I am sorry to say that a chip with that name 51LP I never heard of. I guess you will be better off buying a small PSU that can power your leds. They are very cheap from E-Bay or Aliexpress.

Regards Silvio

smpsdiyer
03-14-2020, 05:17 PM
Hi Silivio,

Thank you for your reply.

I was given a reply with this link by "JFJ" from a wellknown repair site's forum:

https://www.olx.ro/oferta/kp1051-51lp-integrat-ic-tranzistor-mosfet-quasi-resonant-buck-IDcS5Ld.html#55cc21ad46

and this with datasheet in english:

http://www.kiwiinst.com/product_detail.aspx?k1=2&k2=6&k3=24&id=132###

It's the same IC.

Hope it helps others.

DannyPhilips
07-09-2020, 09:19 AM
Good afternoon! Did you manage to repair the LED bulb using a replacement?