Samsung B2330H Dead

[VaNDAL_UK]

Re: Samsung B2330H Dead

On the hacked MOSFET
The pins read:
pins 1,3 = 671
pins 1,5 = 362
pins 1,7 = 871

These reading are the same on the untouched one. Pins 2,4,6,8 are all bridged on both.

So I guess this MOSFET isn't the issue!?!

Here is the top side.

[VaNDAL_UK]

Re: Samsung B2330H Dead

Yeah! thanks,

Not sure how to test the ic and weather the pads are an issue being bridged together on one side form the botch.

Even If I replace or fix the dogs dinner. I guess there must have been somthing wrong for someone to hack at it. Chances are I'll have to replace the caps aswell.

[budm]

Re: Samsung B2330H Dead

Start Checking the resistance between S-G, S-D, D-G.

[ratdude747]

Re: Samsung B2330H Dead

I see.

Quick on the replies today.

[VaNDAL_UK]

Re: Samsung B2330H Dead

Found the data sheet.

http://www.alldatasheet.com/datashee...P/STM8309.html

It's a STM8309T .. sorry my eyes are not so good any more!

[budm]

Re: Samsung B2330H Dead

It looks like some one was trying to remove it but did not have good soldering iron that can maintain the heat.
By the way, they are 8-pin package MOSFET.
Do you have the board number and the pictures of the front side of the board?
I would clean up the solder joints and see if it has the fuse for the inverter section, see if it is blown, if it is OK, then it may not have the MOSFET problem.

[ratdude747]

Re: Samsung B2330H Dead

Thanks, I can't find out the spec either!

Can you think of why someone would hack away at that MOSFET?

Probably a proprietary mosfet if no datasheet can be found.

remove the Mosfet and test it out of circuit.

To test a mosfet, use the industry standard pinout:



Set your DMM to diode mode (on my meter it's 2K)

(look online for the other instructions, as my memory is failing me)


If it's bad, order a replacement (or two if it is a pair, always replace them in pairs). If it is proprietary, there is likely a kit for it on ebay... Usually I do not advertise ebay parts but for proprietary stuff it is often the best or only choice.

As for why, my guess would be noobery... I have seen dumber stuff done by idiots... like CD audio cables connected to floppy drives, "shotgun" repair attempts, etc.

[VaNDAL_UK]

Re: Samsung B2330H Dead

Thanks, I can't find out the spec either!

Can you think of why someone would hack away at that MOSFET?

[budm]

Re: Samsung B2330H Dead

They are dual MOSFET for driving the Inverter transformer. What you need to do first is to remove the solder bridge with solder wick, then do the resistance measurement on both of them, so far I cannot locate the spec sheet for this IC yet.

[VaNDAL_UK]

Hi all,

I hope you can help me out. I have just got one of the above monitors and it is dead.

Take a look at the pictures tells a thousand words..

Some bright spark decided to hack away at the coponent and made a real dogs dinner of it!!

The component is SIM8309T there is an identical one on the board.

After looking at the hacking the whole one side is bridged.

Any advice on this would be appreciated!

Thanks.