Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default CCFL & Inverter problem

Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...
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Default CCFL & Inverter problem

benitos wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...


What model is your Toshiba Satellite??
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Default CCFL & Inverter problem

benitos wrote in message
...
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...


Any disc ceramic C , leaky, with the tube?


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Default CCFL & Inverter problem

On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos
wrote:

Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill
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Default CCFL & Inverter problem

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,


Have a Toshiba Satellite laptop with a "no display" symptom.


After checking it, i can notice a very dim picture , the CCFL doesn't
lit.


After opening it , I found that the inverter had a fuse open .


Replace the fuse but after , the computer did not power up.


There was a short on the inverter boards so I replaced it with the
same model.


Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.


Is is possible the the CCFL is bad also ?


Thanks for your help...


It's possible. *When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -


Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.



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Default CCFL & Inverter problem

On Mon, 22 Aug 2011 14:19:37 -0700 (PDT) benitos
wrote in Message id:
:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,


Have a Toshiba Satellite laptop with a "no display" symptom.


After checking it, i can notice a very dim picture , the CCFL doesn't
lit.


After opening it , I found that the inverter had a fuse open .


Replace the fuse but after , the computer did not power up.


There was a short on the inverter boards so I replaced it with the
same model.


Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.


Is is possible the the CCFL is bad also ?


Thanks for your help...


It's possible. *When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -


Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.


Sounds like it could be a tube. Most inverters have a controller which
will shut down if the load of the tube is not correct. Best to replace
both.
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Default CCFL & Inverter problem

On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,


Have a Toshiba Satellite laptop with a "no display" symptom.


After checking it, i can notice a very dim picture , the CCFL doesn't
lit.


After opening it , I found that the inverter had a fuse open .


Replace the fuse but after , the computer did not power up.


There was a short on the inverter boards so I replaced it with the
same model.


Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.


Is is possible the the CCFL is bad also ?


Thanks for your help...


It's possible. *When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -


Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.

That indicates the tube is old, and dying. It gets a pinkish tint
and the current rises. Replace the tube and you will have a good
display.

PlainBill
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Default CCFL & Inverter problem

On Aug 23, 1:42*pm, wrote:
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos





wrote:
On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos


wrote:
Hi ,


Have a Toshiba Satellite laptop with a "no display" symptom.


After checking it, i can notice a very dim picture , the CCFL doesn't
lit.


After opening it , I found that the inverter had a fuse open .


Replace the fuse but after , the computer did not power up.


There was a short on the inverter boards so I replaced it with the
same model.


Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.


Is is possible the the CCFL is bad also ?


Thanks for your help...


It's possible. *When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.


PlainBill- Masquer le texte des messages précédents -


- Afficher le texte des messages précédents -


Model is P200-MB1


Only half of the CCFL lit (kind of pink) and shuts down.


That indicates the tube is old, and dying. * It gets a pinkish tint
and the current rises. *Replace the tube and you will have a good
display.

PlainBill- Hide quoted text -

- Show quoted text -


OK , thank you all.
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Default CCFL & Inverter problem

wrote in message
...
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -


Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.

That indicates the tube is old, and dying. It gets a pinkish tint
and the current rises. Replace the tube and you will have a good
display.

PlainBill



Does one inverter supply two tubes? And if disconnecting the problematic
tube , as a proving exercise, do you have to mitigate for overdrive to the
single tube, even for say 5 seconds of proving use?


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Default CCFL & Inverter problem

On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
put finger to keyboard and composed:

Model is P200-MB1


FYI, here are circuit diagrams ...

TOSHIBA Satellite P200 P205 - COMPAL LA-3441P ISRAA - REV 0.1.pdf
http://www.4shared.com/get/2082TS5c/...0_P205_-_.html

TOSHIBA Satellite P200 P205 - COMPAL LA-3711P - REV 1.0.pdf
http://www.4shared.com/get/c0cOnc2A/...0_P205_-_.html

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


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Default CCFL & Inverter problem

Franc Zabkar wrote in message
...
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
put finger to keyboard and composed:

Model is P200-MB1


FYI, here are circuit diagrams ...

TOSHIBA Satellite P200 P205 - COMPAL LA-3441P ISRAA - REV 0.1.pdf
http://www.4shared.com/get/2082TS5c/...0_P205_-_.html

TOSHIBA Satellite P200 P205 - COMPAL LA-3711P - REV 1.0.pdf
http://www.4shared.com/get/c0cOnc2A/...0_P205_-_.html

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.



Impressive component level schema except not inverter + backlight? in less
than 1.4 Meg pdfs
Control line BKLT references but not what it is controlling AFAICS


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Default CCFL & Inverter problem

On Wed, 24 Aug 2011 08:26:30 +0100, "N_Cook"
wrote:

wrote in message
.. .
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -

Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.

That indicates the tube is old, and dying. It gets a pinkish tint
and the current rises. Replace the tube and you will have a good
display.

PlainBill



Does one inverter supply two tubes? And if disconnecting the problematic
tube , as a proving exercise, do you have to mitigate for overdrive to the
single tube, even for say 5 seconds of proving use?

It varies with the design. I'm more familiar with the full fledged
inverters found in monitors, but it is very common to see one inverter
system driving 4 or even more tubes. The 'system' consists of a
single controller, drivers driving 1 to 6 (or more) transformers, and
each transformer driving one, two or four tubes. The system contains
circuitry which monitors the current through and the voltage across
each tube. The largest single part of the circuit is the transformer,
and even those can be less than 12mm (1/2") on a side.

PlainBill
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Default CCFL & Inverter problem

wrote in message
...
On Wed, 24 Aug 2011 08:26:30 +0100, "N_Cook"
wrote:

wrote in message
.. .
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL

doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -

Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.
That indicates the tube is old, and dying. It gets a pinkish tint
and the current rises. Replace the tube and you will have a good
display.

PlainBill



Does one inverter supply two tubes? And if disconnecting the problematic
tube , as a proving exercise, do you have to mitigate for overdrive to

the
single tube, even for say 5 seconds of proving use?

It varies with the design. I'm more familiar with the full fledged
inverters found in monitors, but it is very common to see one inverter
system driving 4 or even more tubes. The 'system' consists of a
single controller, drivers driving 1 to 6 (or more) transformers, and
each transformer driving one, two or four tubes. The system contains
circuitry which monitors the current through and the voltage across
each tube. The largest single part of the circuit is the transformer,
and even those can be less than 12mm (1/2") on a side.

PlainBill



I was wondering , with a shared inverter, how they avoided possibility of
one tube striking and the other one not .



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Default CCFL & Inverter problem

On Thu, 25 Aug 2011 08:14:54 +0100, "N_Cook"
wrote:

wrote in message
.. .
On Wed, 24 Aug 2011 08:26:30 +0100, "N_Cook"
wrote:

wrote in message
.. .
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL

doesn't
lit.

After opening it , I found that the inverter had a fuse open .

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it with the
same model.

Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -

Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.
That indicates the tube is old, and dying. It gets a pinkish tint
and the current rises. Replace the tube and you will have a good
display.

PlainBill


Does one inverter supply two tubes? And if disconnecting the problematic
tube , as a proving exercise, do you have to mitigate for overdrive to

the
single tube, even for say 5 seconds of proving use?

It varies with the design. I'm more familiar with the full fledged
inverters found in monitors, but it is very common to see one inverter
system driving 4 or even more tubes. The 'system' consists of a
single controller, drivers driving 1 to 6 (or more) transformers, and
each transformer driving one, two or four tubes. The system contains
circuitry which monitors the current through and the voltage across
each tube. The largest single part of the circuit is the transformer,
and even those can be less than 12mm (1/2") on a side.

PlainBill



I was wondering , with a shared inverter, how they avoided possibility of
one tube striking and the other one not .


Matched tubes? Good design? Shared transformer designs also have
small capacitors between the hot side of the transformer and each
CCFL.

If you google the part number of many inverter controllers you can
find extensive information on how to design an inverter.

PlainBill
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Default CCFL & Inverter problem

wrote in
:

On Thu, 25 Aug 2011 08:14:54 +0100, "N_Cook"
wrote:

wrote in message
. ..
On Wed, 24 Aug 2011 08:26:30 +0100, "N_Cook"
wrote:

wrote in message
.. .
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos
wrote:

On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos





wrote:
Hi ,

Have a Toshiba Satellite laptop with a "no display" symptom.

After checking it, i can notice a very dim picture , the CCFL

doesn't
lit.

After opening it , I found that the inverter had a fuse open
.

Replace the fuse but after , the computer did not power up.

There was a short on the inverter boards so I replaced it
with the same model.

Now , the computer boots up , CCFL lit for a few seconds but
shuts down after.

Is is possible the the CCFL is bad also ?

Thanks for your help...

It's possible. When the image first appears, is there a
pinkish hue? Also, inspect the wires from the inverter to the
CCFL carefully.

PlainBill- Masquer le texte des messages précédents -

- Afficher le texte des messages précédents -

Model is P200-MB1

Only half of the CCFL lit (kind of pink) and shuts down.
That indicates the tube is old, and dying. It gets a pinkish
tint and the current rises. Replace the tube and you will have a
good display.

PlainBill


Does one inverter supply two tubes? And if disconnecting the
problematic tube , as a proving exercise, do you have to mitigate
for overdrive to

the
single tube, even for say 5 seconds of proving use?

It varies with the design. I'm more familiar with the full fledged
inverters found in monitors, but it is very common to see one
inverter system driving 4 or even more tubes. The 'system' consists
of a single controller, drivers driving 1 to 6 (or more)
transformers, and each transformer driving one, two or four tubes.
The system contains circuitry which monitors the current through and
the voltage across each tube. The largest single part of the
circuit is the transformer, and even those can be less than 12mm
(1/2") on a side.

PlainBill



I was wondering , with a shared inverter, how they avoided possibility
of one tube striking and the other one not .


Matched tubes? Good design? Shared transformer designs also have
small capacitors between the hot side of the transformer and each
CCFL.

If you google the part number of many inverter controllers you can
find extensive information on how to design an inverter.

PlainBill


I've read that that cap acts as a short(low-
Z load) until the tube fires,then the tube is lower resistance.

--
Jim Yanik
jyanik
at
localnet
dot com


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Default CCFL & Inverter problem

On Aug 23, 1:42*pm, wrote:
On Mon, 22 Aug 2011 14:19:37 -0700 (PDT), benitos





wrote:
On 22 août, 15:28, wrote:
On Mon, 22 Aug 2011 08:37:16 -0700 (PDT), benitos


wrote:
Hi ,


Have a Toshiba Satellite laptop with a "no display" symptom.


After checking it, i can notice a very dim picture , the CCFL doesn't
lit.


After opening it , I found that the inverter had a fuse open .


Replace the fuse but after , the computer did not power up.


There was a short on the inverter boards so I replaced it with the
same model.


Now , the computer boots up , CCFL lit for a few seconds but shuts
down after.


Is is possible the the CCFL is bad also ?


Thanks for your help...


It's possible. *When the image first appears, is there a pinkish hue?
Also, inspect the wires from the inverter to the CCFL carefully.


PlainBill- Masquer le texte des messages précédents -


- Afficher le texte des messages précédents -


Model is P200-MB1


Only half of the CCFL lit (kind of pink) and shuts down.


That indicates the tube is old, and dying. * It gets a pinkish tint
and the current rises. *Replace the tube and you will have a good
display.

PlainBill- Hide quoted text -

- Show quoted text -


Hi , changed the INVERTER and CCFL and samething. Tube lit only half
and shuts down after a few seconds...


Any clue ?

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