Computer Hardware Forum

These tv sets are at work in a corner so i dont have the model numbers
but i`m sure some of you would have seen these by now .
Last years model . The cabinets are totaly plastic , the set is not very
tall .
I have 9 of these sets saved and all have severe convergence distortion
on the picture .
The convergence module on these hangs on the metal  support that holds
the 3 tubes .
the module has 2 large STK chips on them that i suspect is the problem .

Is there a reason so many , perhaps ALL of these sets have this problem
? is there a hidden KNOWN problem on these making it a waste of time
ordering that many STK chips ?
The sets belong to a salvage store where i work on the electronics . I
am not an expert but can replace such parts . They dont want to spend
hundreds getting these fixed so a service shop is out .

Thanks.

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I went looking on the net for these pieces of crap and cant find any .
They may be 2 or 3 years old ?? They are still coming in as store
returns so ??

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First of all, use lateral thinking, later it will lead you to
omnidirectional thinking. Change the chips on ONE board and run it
through all the sets, one at a time. Make sure to check everything that
even looks fusible, and of course see it work in at least one set. Once
it works transfer the board from set to set. All the ones it works in,
order chips for them, and get one extra set for a board you keep, to
fix the rest.

You don't even have to screw the board in, just plug them in. The ones
that don't work, go farther, but at least (hopefully) get the bulk of
it out of there. ( or fixed, whatever ).

You need to get to know what the picture looks like without convergence
correction, this way you can make (in the future) an educated guess as
to what's wrong.

Once you got X amount of them fixed, go on to the rest.

Yes, I'm a pro, but I still work for an old horse trader. When you lack
detailed service info, multiple identical units are the best thing to
have.

JURB

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Also, Inspect the sets throughly for any signs for coolant leakage from any
one of the three crts. This is a very common problem in Samsung / Akai RPTV
CRT sets. Any incidence of finding fluid will preclude how you will attempt
servicing them.
<ZZactly@aol.com> wrote in message
news:1129088722.046034.16230@z14g2000cwz.googlegroups.com...
> First of all, use lateral thinking, later it will lead you to
> omnidirectional thinking. Change the chips on ONE board and run it
> through all the sets, one at a time. Make sure to check everything that
> even looks fusible, and of course see it work in at least one set. Once
> it works transfer the board from set to set. All the ones it works in,
> order chips for them, and get one extra set for a board you keep, to
> fix the rest.
>
> You don't even have to screw the board in, just plug them in. The ones
> that don't work, go farther, but at least (hopefully) get the bulk of
> it out of there. ( or fixed, whatever ).
>
> You need to get to know what the picture looks like without convergence
> correction, this way you can make (in the future) an educated guess as
> to what's wrong.
>
> Once you got X amount of them fixed, go on to the rest.
>
> Yes, I'm a pro, but I still work for an old horse trader. When you lack
> detailed service info, multiple identical units are the best thing to
> have.
>
> JURB
>

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Thanks guys . I did look for coolant leaks and none had it but i have
seen it in the past and junked those sets for parts .

The models are Samsung HCM 4215W and AKAI PT4298HDX/SMS
Both models have P55A chassis .

I like the idea of buying 2 or 4 chips and try the circuit in all . I
did save a couple by using chips from leaker sets .
I was concerned a bigger problem caused these chips to fail in so many
sets .

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Hey Ken, I have the same problem with my tv (Samsung HCM4215W) and was
wondering if you were able to fix yours. My local repairman said the
estimate was $300 for a convergence module, but from reading online, it
seems like I just need either two new IC's, or a new convergence board
with the two IC's. Any help?

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On 21 Oct 2005 10:49:18 -0700, yazandtony@aol.com wrote:

>Hey Ken, I have the same problem with my tv (Samsung HCM4215W) and was
>wondering if you were able to fix yours. My local repairman said the
>estimate was $300 for a convergence module, but from reading online, it
>seems like I just need either two new IC's, or a new convergence board
>with the two IC's. Any help?
>

Ask the shop that tech works for, is this shop he works for samsung
servicer authorized?  This is only way shops can get service manuals
and schematics for Samsung stuff.

300 estimate is about right.  I have done many of these.

Cheers, Wizard

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"Jason D." <jpero@sympatico.ca> wrote in message
news:4359a350.1486225078@news1.on.sympatico.ca...
> On 21 Oct 2005 10:49:18 -0700, yazandtony@aol.com wrote:
> 
>
> Ask the shop that tech works for, is this shop he works for samsung
> servicer authorized?  This is only way shops can get service manuals
> and schematics for Samsung stuff.
>
> 300 estimate is about right.  I have done many of these.
>
> Cheers, Wizard

Rates will vary, but $300 is not out of line in many markets.  We usually
repair the boards rather than replacing them.  Like many repairs, these can
be a can of worms for someone not familiar with doing these repairs.

You can buy the manuals from distributors or download them from several
sites where shops share manuals, or get them from another shop that is
authorized, just like the way you can get tips from other servicers.  We are
not Samsung authorized and this is one manual that I got from Tritronics for
a little over $10.

Leonard

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I found the chips on line for 15$ each . We dont want to spend much on
these so 4 chips were ordered and on the way .
I will replace them on one board and make sure all those fuse resistors
are good then try it out .
Any sets that it fixes will get more chips ordered .

I know all about buying cheap parts but this is orders from headquarers
If it dont work the sets go away broken .

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Hey thanks Jason :)

So what exactly is the convergence module? From looking at the tv set,
I can see the two IC's, connected to the convergence AMP board, that
sits in a metal alloy heat sink, that is screwed/hangs right behind the
three crt's. Even looking around via google, I can't seem to find any
replacement convergence module's, or even any pics of it. What does it
look like? I did find a thing infront of the middle (green) crt board
with some numbers on it (sorry!) with a label like VM008 something.

Also from reading around, it seems like the convergence module costs
$300, so are they even charging me for labor? How much would a
convergence module cost on its own?

So, from what the serviceman told me (a new convergence module) would
getting a new convergence amp board (AA95-2002A is the one being
recommended), with two new convergence IC's (STK392-040) fix the
convergence problem I have?

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