[SOLVED] find plus and minus on a small board ?

Status
Not open for further replies.
A

adika

Newbie level 4
Joined
Aug 9, 2012
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,315
hi, anybody know how i whould be able to find + and - on a board without any indications with a multimeter?
it should be around the green line a draw in the picture or how can i trouleshoot the components if they r ok?
sorry im kind a noob at this
thanks
 

Attachments

  • 09082012085.jpg
    1.4 MB · Views: 107
  • 09082012084.jpg
    1.4 MB · Views: 105

Refer datasheet for that ic. And trace out the supply pins and output.
 

mailus said:
Refer datasheet for that ic. And trace out the supply pins and output.
Click to expand...

problem is i dont have the datasheet for this
any other way?
thanks
 

can you set the cam to macro mode and then upload the photo?
 

there might be a copper fill on the underside of the PCB, most provably its connected to ground. So do a continuity check for that. +Ve can be found (i hope) by checking continuity between the pads and the other IC, ruling out the ground terminal you have found earlier.
 
You should provide better and high quality photos of this PCB. Use micro on photodevice and make photo from closer distance with good light, and wait to focus be good.
 

Can not see the ID of the IC. Can you load a better picture?
 

thank u all for your responses i got it solved i found the datasheet
thanks again
 

A suggestion to upload a better quality image always helps finding the datasheet :shock:
This was quite a constructive thread.

(sorry but I couldn't resist)
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…