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From: Bart Bervoets on 3 Feb 2010 11:02
No bulged caps, anyone an idea what can cause this, i have 2 that do
this, when the pic appears it looks good so no bad bulb.

Bart Bervoets
From: mm on 3 Feb 2010 13:04
On Wed, 03 Feb 2010 17:02:02 +0100, Bart Bervoets
<sunnylion(a)online.be> wrote:

>No bulged caps, anyone an idea what can cause this, i have 2 that do
>this, when the pic appears it looks good so no bad bulb.
>
>Bart Bervoets

Same brand? Same model? What brand? What model? What signal?

My analog tv wasn't working right, for a whole hour. Then I noticed
somehow it had changed to channel 2 from channel 3.
From: D Yuniskis on 3 Feb 2010 14:01
Hi Bart,

Bart Bervoets wrote:
> No bulged caps, anyone an idea what can cause this, i have 2 that do
> this, when the pic appears it looks good so no bad bulb.

Caps don't have to be "bulged" to be bad. Is controller shutting
down for an overcurrent fault, etc. (or, is the image still
visible even w/o backlight(s)?)
From: John Ferrier on 3 Feb 2010 16:46

"D Yuniskis" <not.going.to.be(a)seen.com> wrote in message
news:hkcgin$qnq$1(a)speranza.aioe.org...
> Hi Bart,
>
> Bart Bervoets wrote:
>> No bulged caps, anyone an idea what can cause this, i have 2 that do
>> this, when the pic appears it looks good so no bad bulb.
>
> Caps don't have to be "bulged" to be bad. Is controller shutting
> down for an overcurrent fault, etc. (or, is the image still
> visible even w/o backlight(s)?)

Typical of inverter shut down due to detecting an unbalanced load on the
cold cathode tube drives.
Can be the tubes or inverter faulty.
Most drive control IC's have a pin that can be forced low to disable this
protection feature for fault finding.

Hope that helps John.


From: Bart Bervoets on 4 Feb 2010 07:17
Hello,

How would that work, i have read about the possibillity to disable
this protection but i am not sure what chip and what pin, you mean
there's a pin i must put to ground? or open the circuit for that pin?
Can this problem be caused by bad caps, the monitor in question had
bulged caps but i only replaced the bulged ones, the monitor worked
fine for 2 weeks after that and now shuts down, shall i replace the
remaining caps?
They are close to the voltage regulators on the power supply.
Thanks for helping, i get a lot of screens that have this fault.

Bart Bervoets
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