I got a HP L2045w monitor when I turn it on the LED turns green and I get a white screen, I cant get to menus.
I took it apart and looked at, the electrolytic can caps, cables,5v power rail, they all were good. Except the main fuse on the LCD controller board.
The ground and supply rails are shorted on the controller board. I know this because the resistances are ~5Ω. When I bridge the fuse I hear a clicking sound coming out of the main board like a fuse is blowing then resets.
I repaired a HP LP1965 monitor with the same problem, it was a shorted ceramic capacitor.
So i started desoldering the ceramic capacitors,and diodes, using a hot air rework station. Then I desoldered the FET transistor which when I resoldered it made the resistances go up from ~5Ω to ~1kΩ. When I Bridge the fuse with a strand of copper wire, the board still shorts out.
I recorded resistance values of the test points after I resoldered the FET
Back of the board
VCOM= 20MΩ
VDDD= 1.034kΩ
VDDG= 100KΩ
VEEG= 147.2KΩ
VDDA=0.884KΩ
V1= 0.875KΩ
V2= 0.873KΩ
V3= 0.776KΩ
V4= 0.749KΩ
V5= 0.729KΩ
V6= 0.629KΩ
V7= 0.639KΩ
V8= 0.566KΩ
V9= 0.491KΩ
V10= 0.416KΩ
V11= 0.375KΩ
V12= 0.315KΩ
V13= 118.6Ω
V14= 48.6Ω (this seems really low)
I took pictures of the circuit board
*most likely this is wrong so don't trust it.
Also there is a Photoshop file which overlays the front and back layers
https://trpxsg.bay.livefilestore.com...ownload&psid=1
Any help would be appreciated,
Thanks
I took it apart and looked at, the electrolytic can caps, cables,5v power rail, they all were good. Except the main fuse on the LCD controller board.
The ground and supply rails are shorted on the controller board. I know this because the resistances are ~5Ω. When I bridge the fuse I hear a clicking sound coming out of the main board like a fuse is blowing then resets.
I repaired a HP LP1965 monitor with the same problem, it was a shorted ceramic capacitor.
So i started desoldering the ceramic capacitors,and diodes, using a hot air rework station. Then I desoldered the FET transistor which when I resoldered it made the resistances go up from ~5Ω to ~1kΩ. When I Bridge the fuse with a strand of copper wire, the board still shorts out.
I recorded resistance values of the test points after I resoldered the FET
Back of the board
VCOM= 20MΩ
VDDD= 1.034kΩ
VDDG= 100KΩ
VEEG= 147.2KΩ
VDDA=0.884KΩ
V1= 0.875KΩ
V2= 0.873KΩ
V3= 0.776KΩ
V4= 0.749KΩ
V5= 0.729KΩ
V6= 0.629KΩ
V7= 0.639KΩ
V8= 0.566KΩ
V9= 0.491KΩ
V10= 0.416KΩ
V11= 0.375KΩ
V12= 0.315KΩ
V13= 118.6Ω
V14= 48.6Ω (this seems really low)
I took pictures of the circuit board
- green is the components i tested
- red is positive*
- Black is negative*
- blue is potentially bad components
- purple is the blown fuse
- yellow is a FET transistor that i desoldered
*most likely this is wrong so don't trust it.
Also there is a Photoshop file which overlays the front and back layers
https://trpxsg.bay.livefilestore.com...ownload&psid=1
Any help would be appreciated,
Thanks