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Tom's Hardware > Forum > Home Theatre > HDTV > Akai PT4298HD lens problem?

Akai PT4298HD lens problem?

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Anonymous   08-06-2005 at 10:38:04 PM

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

I have a 42" Akai projection TV, model PT4298HD. I turned it on today
and saw that the picture appeared misaligned -- the red color displays
in an out-of-sync, non-horizontal shape. See these pictures:
http://stoicheff.dynu.com/images/43600195.JPG
http://stoicheff.dynu.com/images/43600196.JPG
I've tinkered with computers, but I'm new to projection TVs. Any pointer
in the right direction will be highly appreciated.
Thanks.
Svilen

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Kip   08-07-2005 at 12:05:37 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

If its a Plasma set you will have to call for
service there is zip you can do yourself.
If its a regular pro set change the convergence IC,s

kip



"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>I have a 42" Akai projection TV, model PT4298HD. I turned it on today and
>saw that the picture appeared misaligned -- the red color displays in an
>out-of-sync, non-horizontal shape. See these pictures:
> http://stoicheff.dynu.com/images/43600195.JPG
> http://stoicheff.dynu.com/images/43600196.JPG
> I've tinkered with computers, but I'm new to projection TVs. Any pointer
> in the right direction will be highly appreciated.
> Thanks.
> Svilen

Reply to Kip
Anonymous   08-07-2005 at 02:09:05 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

Two conditions will affect this, first is leaking crt onto the deflection
board, very common with Samsung, Akai RPTV CRT SETS. Second in failure in
the convergence dynamic output circuit or the fluid has also gotten to the
signal circuit contaminating the DCU assembly. In depth diagnostics required
to assure that there is no coolant fluid leakage, and if there is, what is
damaged. BTW the crts come with the yokes attached. When changing any of
them for leakage order the crt circuit boards (complete 3 card assembly with
focus assembly) also. What a nice design!!
"kip" <nospam@nospam.com> wrote in message
news:newscache$8omtki$906$1@newsfeed.niagara.com...
> If its a Plasma set you will have to call for
> service there is zip you can do yourself.
> If its a regular pro set change the convergence IC,s
>
> kip
>
>
>
> "Svilen Stoicheff" <svilen@yahoo.com> wrote in message
> news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today and
>>saw that the picture appeared misaligned -- the red color displays in an
>>out-of-sync, non-horizontal shape. See these pictures:
>> http://stoicheff.dynu.com/images/43600195.JPG
>> http://stoicheff.dynu.com/images/43600196.JPG
>> I've tinkered with computers, but I'm new to projection TVs. Any pointer
>> in the right direction will be highly appreciated.
>> Thanks.
>> Svilen
>
>

Reply to Anonymous
Anonymous   08-07-2005 at 05:22:07 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

Art wrote:
> Two conditions will affect this, first is leaking crt onto the deflection
> board, very common with Samsung, Akai RPTV CRT SETS. Second in failure in
> the convergence dynamic output circuit or the fluid has also gotten to the
> signal circuit contaminating the DCU assembly. In depth diagnostics required
> to assure that there is no coolant fluid leakage, and if there is, what is
> damaged. BTW the crts come with the yokes attached. When changing any of
> them for leakage order the crt circuit boards (complete 3 card assembly with
> focus assembly) also. What a nice design!!

I should have mentioned that the TV in question is a projection TV.

> "kip" <nospam@nospam.com> wrote in message
> news:newscache$8omtki$906$1@newsfeed.niagara.com...
>
>>If its a Plasma set you will have to call for
>>service there is zip you can do yourself.
>>If its a regular pro set change the convergence IC,s
>>
>>kip
>>
>>
>>
>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>
>>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today and
>>>saw that the picture appeared misaligned -- the red color displays in an
>>>out-of-sync, non-horizontal shape. See these pictures:
>>>http://stoicheff.dynu.com/images/43600195.JPG
>>>http://stoicheff.dynu.com/images/43600196.JPG
>>>I've tinkered with computers, but I'm new to projection TVs. Any pointer
>>>in the right direction will be highly appreciated.
>>>Thanks.
>>>Svilen
>>
>>
>
>

Reply to Anonymous
Anonymous   08-07-2005 at 02:22:05 PM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

As Mentioned, nothing that the average consumer can address themselves, have
it serviced. BTW you will not want to handle any of the internal components
if indeed there is coolant leakage!!
"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
news:ItOdnVTc2oUcEWjfRVn-hg@comcast.com...
> Art wrote:
>> Two conditions will affect this, first is leaking crt onto the deflection
>> board, very common with Samsung, Akai RPTV CRT SETS. Second in failure in
>> the convergence dynamic output circuit or the fluid has also gotten to
>> the signal circuit contaminating the DCU assembly. In depth diagnostics
>> required to assure that there is no coolant fluid leakage, and if there
>> is, what is damaged. BTW the crts come with the yokes attached. When
>> changing any of them for leakage order the crt circuit boards (complete 3
>> card assembly with focus assembly) also. What a nice design!!
>
> I should have mentioned that the TV in question is a projection TV.
>
>> "kip" <nospam@nospam.com> wrote in message
>> news:newscache$8omtki$906$1@newsfeed.niagara.com...
>>
>>>If its a Plasma set you will have to call for
>>>service there is zip you can do yourself.
>>>If its a regular pro set change the convergence IC,s
>>>
>>>kip
>>>
>>>
>>>
>>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>>news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>>
>>>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today
>>>>and saw that the picture appeared misaligned -- the red color displays
>>>>in an out-of-sync, non-horizontal shape. See these pictures:
>>>>http://stoicheff.dynu.com/images/43600195.JPG
>>>>http://stoicheff.dynu.com/images/43600196.JPG
>>>>I've tinkered with computers, but I'm new to projection TVs. Any pointer
>>>>in the right direction will be highly appreciated.
>>>>Thanks.
>>>>Svilen
>>>
>>>
>>

Reply to Anonymous
Anonymous   08-07-2005 at 07:24:21 PM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

Art wrote:
> As Mentioned, nothing that the average consumer can address themselves, have
> it serviced. BTW you will not want to handle any of the internal components
> if indeed there is coolant leakage!!

Understood. Thanks for the input. You are right, it should be serviced
by a qualified technician -- I just wanted to do due diligence and
verify I'm not missing something trivial. For all I can say, it's
probably a convergence board issue -- convergence is way off, and it
doesn't get any better when I try to adjust it manually.
Here's what it looks like:
http://stoicheff.dynu.com/images/A [...] icture.jpg
http://stoicheff.dynu.com/images/A [...] rgence.jpg
http://stoicheff.dynu.com/images/A [...] rgence.jpg


> "Svilen Stoicheff" <svilen@yahoo.com> wrote in message
> news:ItOdnVTc2oUcEWjfRVn-hg@comcast.com...
>
>>Art wrote:
>>
>>>Two conditions will affect this, first is leaking crt onto the deflection
>>>board, very common with Samsung, Akai RPTV CRT SETS. Second in failure in
>>>the convergence dynamic output circuit or the fluid has also gotten to
>>>the signal circuit contaminating the DCU assembly. In depth diagnostics
>>>required to assure that there is no coolant fluid leakage, and if there
>>>is, what is damaged. BTW the crts come with the yokes attached. When
>>>changing any of them for leakage order the crt circuit boards (complete 3
>>>card assembly with focus assembly) also. What a nice design!!
>>
>>I should have mentioned that the TV in question is a projection TV.
>>
>>
>>>"kip" <nospam@nospam.com> wrote in message
>>>news:newscache$8omtki$906$1@newsfeed.niagara.com...
>>>
>>>
>>>>If its a Plasma set you will have to call for
>>>>service there is zip you can do yourself.
>>>>If its a regular pro set change the convergence IC,s
>>>>
>>>>kip
>>>>
>>>>
>>>>
>>>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>>>news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>>>
>>>>
>>>>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today
>>>>>and saw that the picture appeared misaligned -- the red color displays
>>>>>in an out-of-sync, non-horizontal shape. See these pictures:
>>>>>http://stoicheff.dynu.com/images/43600195.JPG
>>>>>http://stoicheff.dynu.com/images/43600196.JPG
>>>>>I've tinkered with computers, but I'm new to projection TVs. Any pointer
>>>>>in the right direction will be highly appreciated.
>>>>>Thanks.
>>>>>Svilen
>>>>
>>>>
>

Reply to Anonymous
Anonymous   08-08-2005 at 12:36:31 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

I'm considering a similar Akai set, actualy I was going to post to see if
people had problems with them.

How long have you had your set? Did you buy a protection plan, if so, is
this type of repair covered???

"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
news:WsmdnZpm_KN3zGvfRVn-gA@comcast.com...
> Art wrote:
>> As Mentioned, nothing that the average consumer can address themselves,
>> have it serviced. BTW you will not want to handle any of the internal
>> components if indeed there is coolant leakage!!
>
> Understood. Thanks for the input. You are right, it should be serviced by
> a qualified technician -- I just wanted to do due diligence and verify I'm
> not missing something trivial. For all I can say, it's probably a
> convergence board issue -- convergence is way off, and it doesn't get any
> better when I try to adjust it manually.
> Here's what it looks like:
> http://stoicheff.dynu.com/images/A [...] icture.jpg
> http://stoicheff.dynu.com/images/A [...] rgence.jpg
> http://stoicheff.dynu.com/images/A [...] rgence.jpg
>
>
>> "Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>> news:ItOdnVTc2oUcEWjfRVn-hg@comcast.com...
>>
>>>Art wrote:
>>>
>>>>Two conditions will affect this, first is leaking crt onto the
>>>>deflection board, very common with Samsung, Akai RPTV CRT SETS. Second
>>>>in failure in the convergence dynamic output circuit or the fluid has
>>>>also gotten to the signal circuit contaminating the DCU assembly. In
>>>>depth diagnostics required to assure that there is no coolant fluid
>>>>leakage, and if there is, what is damaged. BTW the crts come with the
>>>>yokes attached. When changing any of them for leakage order the crt
>>>>circuit boards (complete 3 card assembly with focus assembly) also. What
>>>>a nice design!!
>>>
>>>I should have mentioned that the TV in question is a projection TV.
>>>
>>>
>>>>"kip" <nospam@nospam.com> wrote in message
>>>>news:newscache$8omtki$906$1@newsfeed.niagara.com...
>>>>
>>>>
>>>>>If its a Plasma set you will have to call for
>>>>>service there is zip you can do yourself.
>>>>>If its a regular pro set change the convergence IC,s
>>>>>
>>>>>kip
>>>>>
>>>>>
>>>>>
>>>>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>>>>news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>>>>
>>>>>
>>>>>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today
>>>>>>and saw that the picture appeared misaligned -- the red color displays
>>>>>>in an out-of-sync, non-horizontal shape. See these pictures:
>>>>>>http://stoicheff.dynu.com/images/43600195.JPG
>>>>>>http://stoicheff.dynu.com/images/43600196.JPG
>>>>>>I've tinkered with computers, but I'm new to projection TVs. Any
>>>>>>pointer in the right direction will be highly appreciated.
>>>>>>Thanks.
>>>>>>Svilen
>>>>>
>>>>>
>>

Reply to Anonymous
Anonymous   08-09-2005 at 12:05:24 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv (More info?)

 

Krisma wrote:
> I'm considering a similar Akai set, actualy I was going to post to see if
> people had problems with them.
>
> How long have you had your set? Did you buy a protection plan, if so, is
> this type of repair covered???
>
I've had it for two years, and it's been great so far. No, I didn't buy
a protection plan, I never do.

> "Svilen Stoicheff" <svilen@yahoo.com> wrote in message
> news:WsmdnZpm_KN3zGvfRVn-gA@comcast.com...
>
>>Art wrote:
>>
>>>As Mentioned, nothing that the average consumer can address themselves,
>>>have it serviced. BTW you will not want to handle any of the internal
>>>components if indeed there is coolant leakage!!
>>
>>Understood. Thanks for the input. You are right, it should be serviced by
>>a qualified technician -- I just wanted to do due diligence and verify I'm
>>not missing something trivial. For all I can say, it's probably a
>>convergence board issue -- convergence is way off, and it doesn't get any
>>better when I try to adjust it manually.
>>Here's what it looks like:
>>http://stoicheff.dynu.com/images/AkaiPT4298HD/distortedPicture.jpg
>>http://stoicheff.dynu.com/images/AkaiPT4298HD/blueConvergence.jpg
>>http://stoicheff.dynu.com/images/AkaiPT4298HD/redConvergence.jpg
>>
>>
>>
>>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>>news:ItOdnVTc2oUcEWjfRVn-hg@comcast.com...
>>>
>>>
>>>>Art wrote:
>>>>
>>>>
>>>>>Two conditions will affect this, first is leaking crt onto the
>>>>>deflection board, very common with Samsung, Akai RPTV CRT SETS. Second
>>>>>in failure in the convergence dynamic output circuit or the fluid has
>>>>>also gotten to the signal circuit contaminating the DCU assembly. In
>>>>>depth diagnostics required to assure that there is no coolant fluid
>>>>>leakage, and if there is, what is damaged. BTW the crts come with the
>>>>>yokes attached. When changing any of them for leakage order the crt
>>>>>circuit boards (complete 3 card assembly with focus assembly) also. What
>>>>>a nice design!!
>>>>
>>>>I should have mentioned that the TV in question is a projection TV.
>>>>
>>>>
>>>>
>>>>>"kip" <nospam@nospam.com> wrote in message
>>>>>news:newscache$8omtki$906$1@newsfeed.niagara.com...
>>>>>
>>>>>
>>>>>
>>>>>>If its a Plasma set you will have to call for
>>>>>>service there is zip you can do yourself.
>>>>>>If its a regular pro set change the convergence IC,s
>>>>>>
>>>>>>kip
>>>>>>
>>>>>>
>>>>>>
>>>>>>"Svilen Stoicheff" <svilen@yahoo.com> wrote in message
>>>>>>news:4cSdnZ2dnZ1iSM3GnZ2dnVOwaN-dnZ2dRVn-yZ2dnZ0@comcast.com...
>>>>>>
>>>>>>
>>>>>>
>>>>>>>I have a 42" Akai projection TV, model PT4298HD. I turned it on today
>>>>>>>and saw that the picture appeared misaligned -- the red color displays
>>>>>>>in an out-of-sync, non-horizontal shape. See these pictures:
>>>>>>>http://stoicheff.dynu.com/images/43600195.JPG
>>>>>>>http://stoicheff.dynu.com/images/43600196.JPG
>>>>>>>I've tinkered with computers, but I'm new to projection TVs. Any
>>>>>>>pointer in the right direction will be highly appreciated.
>>>>>>>Thanks.
>>>>>>>Svilen
>>>>>>
>>>>>>
>
>

Reply to Anonymous
Anonymous   08-09-2005 at 07:37:44 AM
- 0 +

Archived from groups: alt.tv.tech.hdtv,sci.electronics.repair (More info?)

 

On Sun, 07 Aug 2005 13:24:21 -0500, Svilen Stoicheff
<svilen@yahoo.com> wrote:

>Art wrote:
>> As Mentioned, nothing that the average consumer can address themselves, have
>> it serviced. BTW you will not want to handle any of the internal components
>> if indeed there is coolant leakage!!
>

This is Samsung-made TV, just the name plate and different model #.
Take it to decent service shop that knows samsung stuff. The parts to
repair this failure is common availablity.

BTW, this is very, very common failure.

Oh, be prepared to wait awhile if your shop have to order the main amp
IC for the convergence because particular IC is on backorder so often
due to very poor heatsinking (keeping IC cool enough) action. If the
shop is samsung authorized, they will order one through Samsung and
get IC in few days.

Cheers, Wizard

Reply to Anonymous
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