Question about HP COMPAQ 7540 CRT Monitor

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My campaq desktop monitor 7540 is flickering horizontal direction

It was working well for the past 4 years, recently we upgraded the CPU to i3 thereafter after one week monitor started giving problem

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Try a different CRT monitor on your computer.
Try your CRT monitor on a different computer.
See if the problem "moves" to the other computer,
or whether your computer has problems with *ANY* monitor.

Posted on Mar 16, 2014

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Posted on Jan 02, 2017

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COMPAQ 7540 CRT Monitor servicemode pls provide me. Thanks.


You could try this link, but it would be far cheaper to upgrade to a new or second user LED/LCD monitor
http://www.eserviceinfo.com/index.php?what=search2&searchstring=schematics+diagrams+hp+7540+crt+monitor

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I want to upgrade the mother board in my Vaio PCV-RZ44G Desktop so that I can run Windows 8. What board forms are compatible and is an Intel I3 or I5 CPU better?


You would be better off applying the money to a new computer. You are opening "Pandora's Box" . You will end up with a old case with ALL new components. That may or may not work, A.K.A., "pain and heartache".

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HP 7540 crt monitor shrinks to a horizontal line


It would be more economical to purchase a new or used LED/LCD display rather than wasting money on an old CRT monitor.

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PC won't turn on, blue light flickering, green light flickering


check your monitor's connection, its power and VGA connection to cpu, the cpu may be good but you just see black screen bec. your monitor remained off. please bring it to HP service center for more help

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Red colour problem in compaq 7540


Check to see whether monitor terminal has a broken pin. Otherwise change the VGA card.

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Flickering, jittery image, white horizontal flashing lines


this is real old right
no photo off i messing up, how can we guess, what you see?
amazing....
my guess power pack shot.
i guess you cant barrow a monitor and try that?
2nd guess blind, the back light failing
or is damage if it was hit, the LCD will have damage
gently flex the frame goes nuts, bingo.

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Horizontal lines on my monitor


I have a similar problem with a 2 year old Samsung monitor. I have tried to make a screen dump of it, but the horizontal lines do not show up then. This I have read indicates that the problem is in the monitor and not the video card.

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1 Answer

Ocassional flickering


Not sure what the problem is, but am experiencing the same symptoms every few minutes on a Mitsu Diamond Pro 91TXM, just retrieved from storage after 7 years. How's your screen holding up since April?

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1 Answer

Monitor flickers and image is reduced and squeezed


Heat related dry solder issue Horizontal output side.

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