HP L1906 no backlight

[lameck chilila]

My monitor has a backlight problem it comes on and I can see everything else in the background.What could be the problem?

[kc8adu]

Re: HP L1906 no backlight

time to open it up,have a good look at it,and post good pics.
iirc bad caps and a blown fuse were the issues on the last ones i fixed.

[PlainBill]

Re: HP L1906 no backlight

My monitor has a backlight problem it comes on and I can see everything else in the background.What could be the problem?

Operator error? According to your post, the backlight? monitor? comes on and you can see everything. What is the problem?

PlainBill

[lameck chilila]

Re: HP L1906 no backlight

I meant to say the backlight comes only for a feel seconds and after its gone I can still see stuff but its dark.

[PlainBill]

Re: HP L1906 no backlight

I meant to say the backlight comes only for a feel seconds and after its gone I can still see stuff but its dark.

That is much clearer. This can be either a problem with the inverter or with the CCFLs. I've explained the problem elsewhere, but here is the short version.

The logic board controls the inverter via two lines - on/off and brightness. When the inverter is commanded on it turns the CCFLs on at full brightness, then after about a second it begins to check the current draw of each CCFL. If the current draw is too low or too high it will shut down all CCFLs.

One technique for testing CCFLs is to buy a CCFL case mod kit. This consists of two CCFLs and an inverter. By hooking the monitor CCFLs to the case mod inverter you can see if all of the CCFLs are working. And by hooking the case mod CCFLs to the monitor inverter you can see if the inverter is working properly.

Note that I didn't think this up myself, far brighter people than me came up with this idea. And it's not an absolute test. I've got one monitor that all CCFLs work with an external inverter and the internal inverter will light external CCFLs at approximately the same brightness.

PlainBill

[lameck chilila]

Re: HP L1906 no backlight

hai,I tryed using an external inverter and the backlight worked just fine meaning my inverter is faulty.If I can get 9v across the input of the high voltage transformer then why would it to fail to work?The inverter uses the su'scon caps is this quality good enough? :noob

[EGuevarae]

Re: HP L1906 no backlight

hai,I tryed using an external inverter and the backlight worked just fine meaning my inverter is faulty.If I can get 9v across the input of the high voltage transformer then why would it to fail to work?The inverter uses the su'scon caps is this quality good enough? :noob

Normally the inverters use at least 12v.
And Su'scons just plain "suck's".
Pics would help.