EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: bauhaus on September 15, 2014, 05:47:51 pm
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Hi!
A friend of mine gave me an old monitor (hitachi cml158xw) which has a problem.
When I connect it to a desktop, the monitor powers on (power light turns green) but I get only a blank display. When I disconnect the vga cable, I can see the known messages (no signal, etc) and the light turns yellow. If I reconnect the cable, the light turns green again.
As I presume, the monitor receives signals from the vga card (I've also checked the continuity of its pins, and it is ok).
Also, because I can see the info messages (e.g. no signal) I think that the fluorescent lamp is ok..
I've also checked (visually) the monitor's board and I didn't see any burnt caps/diodes/resistors/etc.
Do you have any idea what to check next? What would be the fault?
Any help would be very much appreciated!!
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Welcome to the forum.
Confirm backlight is working when connected by shining a flashlight at the screen and looking for info illuminated.
Maybe this screen won't display you current PC settings.
Are the PC video settings set to default monitor to start with?
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Thank you for your reply!
I'll check the backlight this afternoon. I also forgot to mention that I cannot even see the osd menu, although I can see the "no signal", "connect the cable", etc messages.
If there is a problem with the backlight, these messages couldn't be displayed, right? or not?
I'm confused.
I've tested the monitor even in 1024x768 pixels display resolution. Nothing.
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If there is a problem with the backlight, these messages couldn't be displayed, right? or not?
You are correct, you would not see the messages.
Are you trying to use the monitor as a second monitor?
Try connecting it alone and see if the video card identifies it on boot up.
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Does the monitor have any other inputs you can try? VGA / DVI / DisplayPort / Composite etc.
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No, I try it as a primary monitor (alone). It only has the standard d-sub (vga) plug.