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Bright stripe on LCD display

Started by DaveC July 26, 2013
This is a ~ 4 year old HP Pavilion laptop with LCD display.

There is a bright vertical area on the left end of the display that is 
incongruous with the rest of the display. It is only on the left end.

http://imagebin.org/265633

This image also shows the lighter central area of the display which is an 
artifact of just viewing it on-center (or nearly). This phenomenon can be 
ignored. 

Is the stripe due to LCD problem? Or...?

Thanks.

On 26/07/2013 07:27, DaveC wrote:
> This is a ~ 4 year old HP Pavilion laptop with LCD display. > > There is a bright vertical area on the left end of the display that is > incongruous with the rest of the display. It is only on the left end. > > http://imagebin.org/265633 > > This image also shows the lighter central area of the display which is an > artifact of just viewing it on-center (or nearly). This phenomenon can be > ignored. > > Is the stripe due to LCD problem? Or...?
It is such a terrible photograph that it looks mostly like a reflection of something white you left on your desk off bottom right. It doesn't look abrupt enough to be an LCD connection defect which tends to give very sharp linear errors on bit/byte/word boundaries. Looks to me more like a physical fault with the backlighting optics. An impression heightened by a dark ridge to the RHS of the brighter patch. -- Regards, Martin Brown
Martin Brown Inscribed thus:

> On 26/07/2013 07:27, DaveC wrote: >> This is a ~ 4 year old HP Pavilion laptop with LCD display. >> >> There is a bright vertical area on the left end of the display that >> is incongruous with the rest of the display. It is only on the left >> end. >> >> http://imagebin.org/265633 >> >> This image also shows the lighter central area of the display which >> is an artifact of just viewing it on-center (or nearly). This >> phenomenon can be ignored. >> >> Is the stripe due to LCD problem? Or...? > > It is such a terrible photograph that it looks mostly like a > reflection of something white you left on your desk off bottom right. > It doesn't look abrupt enough to be an LCD connection defect which > tends to give very sharp linear errors on bit/byte/word boundaries. > > Looks to me more like a physical fault with the backlighting optics. > An impression heightened by a dark ridge to the RHS of the brighter > patch. >
I would agree ! Probably a defect in the backlight tube/tubes. -- Best Regards: Baron.
> I would agree ! Probably a defect in the backlight tube/tubes.
I've seen dark bands before (burnt out tube) but never a bright band. I suppose all but one could be dimmed... Thanks, Dave
DaveC Inscribed thus:

>> I would agree ! Probably a defect in the backlight tube/tubes. > > I've seen dark bands before (burnt out tube) but never a bright band. > I suppose all but one could be dimmed... > > Thanks, > Dave
The tubes blacken at one end more than the other, so the brightness gets turned up to compensate causing a bright area at one side. Double tube displays do the same but because one tube is at the top and the other at the bottom the bright area tends to be towards one corner. -- Best Regards: Baron.