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Forum index » Electronix » Repair
Samsung 740N repair FFC torn off
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suntzu_2002@yahoo.com
electronics forum beginner


Joined: 16 Jul 2006
Posts: 1

PostPosted: Sun Jul 16, 2006 3:48 am    Post subject: Samsung 740N repair FFC torn off Reply with quote

Hello all, this is not my panel, but I'm curious about this type of
thing... wonder if any of you could lend a hand. This is what we're
dealing with:
http://img.photobucket.com/albums/v293/suntzu_2002/deadLCD.jpg

As you can see the FFC has been torn off completely. With hundreds of
connections broken, there is no way to resolder this... my question
though is this: are all of those connections being terminated at the
silver block? It was my understanding that all the connections at the
sides of an LCD panel were the ground connections, which run through
those FFCs to those grounding blocks which contact the metal housing of
the LCD panel. Am I mistaken? Would it be possible to ground all
those broken connections with one mass block directly on the LCD panel?

Thanks in advance for humoring me.
Stirling
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Dave D
electronics forum Guru


Joined: 08 Sep 2005
Posts: 486

PostPosted: Sun Jul 16, 2006 1:13 pm    Post subject: Re: Samsung 740N repair FFC torn off Reply with quote

<suntzu_2002@yahoo.com> wrote in message
news:1153021681.304550.232800@h48g2000cwc.googlegroups.com...
Quote:
Hello all, this is not my panel, but I'm curious about this type of
thing... wonder if any of you could lend a hand. This is what we're
dealing with:
http://img.photobucket.com/albums/v293/suntzu_2002/deadLCD.jpg

As you can see the FFC has been torn off completely. With hundreds of
connections broken, there is no way to resolder this... my question
though is this: are all of those connections being terminated at the
silver block?

The silver block is a driver IC.

Quote:
It was my understanding that all the connections at the
sides of an LCD panel were the ground connections, which run through
those FFCs to those grounding blocks which contact the metal housing of
the LCD panel. Am I mistaken?

Yes.

Quote:
Would it be possible to ground all
those broken connections with one mass block directly on the LCD panel?


Yes, you can ground all those connections, but you'll end up with a thick
white bar across the screen! The silver block is one of the ICs which
drives groups of rows on the display. Without it, whole section of the
display will not work at all.

Dave
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Dave D
electronics forum Guru


Joined: 08 Sep 2005
Posts: 486

PostPosted: Sun Jul 16, 2006 1:29 pm    Post subject: Re: Samsung 740N repair FFC torn off Reply with quote

"Dave D" <dave-d@dave-d.com> wrote in message
news:neudnWkszLQCpifZRVnyvQ@pipex.net...
Quote:
As you can see the FFC has been torn off completely. With hundreds of
connections broken, there is no way to resolder this... my question
though is this: are all of those connections being terminated at the
silver block?

The silver block is a driver IC.


Actually, I've re-examined the pictures and they appear to terminate the
rows rather than being driver ICs, which would be at the other end and of
course attached to the logic board. My mistake! I still don't think it's as
simple as them being 'grounds' though. Either way, the panel is scrap unless
you can get an LCD specialist to reattach the tab. It probably isn't worth
the expense.

Dave
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Dave D
electronics forum Guru


Joined: 08 Sep 2005
Posts: 486

PostPosted: Sun Jul 16, 2006 1:34 pm    Post subject: Re: Samsung 740N repair FFC torn off Reply with quote

"Dave D" <dave-d@dave-d.com> wrote in message
news:-JednWL6qISioifZRVnyuw@pipex.net...
Quote:

"Dave D" <dave-d@dave-d.com> wrote in message
news:neudnWkszLQCpifZRVnyvQ@pipex.net...
As you can see the FFC has been torn off completely. With hundreds of
connections broken, there is no way to resolder this... my question
though is this: are all of those connections being terminated at the
silver block?

The silver block is a driver IC.


Actually, I've re-examined the pictures and they appear to terminate the
rows rather than being driver ICs, which would be at the other end and of
course attached to the logic board. My mistake! I still don't think it's
as simple as them being 'grounds' though. Either way, the panel is scrap
unless you can get an LCD specialist to reattach the tab. It probably
isn't worth the expense.

OTOH, forget it- the tab is damaged.

Dave
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Jason D.
electronics forum Guru Wannabe


Joined: 06 May 2005
Posts: 196

PostPosted: Mon Jul 17, 2006 2:36 pm    Post subject: Re: Samsung 740N repair FFC torn off Reply with quote

On 15 Jul 2006 20:48:01 -0700, suntzu_2002@yahoo.com wrote:

Quote:
Hello all, this is not my panel, but I'm curious about this type of
thing... wonder if any of you could lend a hand. This is what we're
dealing with:
http://img.photobucket.com/albums/v293/suntzu_2002/deadLCD.jpg

As you can see the FFC has been torn off completely. With hundreds of
connections broken, there is no way to resolder this... my question
though is this: are all of those connections being terminated at the
silver block? It was my understanding that all the connections at the
sides of an LCD panel were the ground connections, which run through
those FFCs to those grounding blocks which contact the metal housing of
the LCD panel. Am I mistaken? Would it be possible to ground all
those broken connections with one mass block directly on the LCD panel?

Thanks in advance for humoring me.
Stirling


A new 740B samsung is about 250 now with 3 year warranty, also there
is 740N still available for appox 200. Both are canadian dollars.

I have feeling that monitor is still under warranty and I wondered how
in first place got this ripped like this? Panel is very well covered
by panel's aluminum/plastic back & steel cover that provides support
structure for the panel and stand.

Yes, how I know? we service samsung authorized stuff.

Cheers, Wizard
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