Re: DELL 3007 WPF blurry and slow

Hi Martin.

I'm pretty sure that AVCC_25 was 2.59V. Based on the name, I would expect something close to 2.5V.

Regarding your PM:

U1 should be the LDO generating AVCC_25.
Based on the picture, the manufacturer is "Analog Devices". Maybe you can find some kind of serial number on it. This would help to find a datasheet.

We have a pin one indicator at the upper left corner. Based on the adjacent
components i would assume: (Counter-clockwise, starting at pin 1)
...

Re: DELL 3007 WPF blurry and slow

Greetings.

Yes, I was not here for a while, sorry for the late answer.

@selldoor

I found my old notes. Unfortunately I did not take any pictures of the failing PCB.
What I can say is, that there are two similar "source" PCBs which are connected by the ribbon cables shown in the picture above.
On the left PCB, the ceramic capacitor C28 (10uF) failed and caused the error.

@WhiteDesertSun

The picture I got when I connected DVI was heavily distorted,...

Re: DELL 3007 WPF blurry and slow

Hi Davi.p!

Just a little update:

I managed to get the display working again. I found a faulty ceramic-cap on the source PCB (connected by the ribbon cables), creating a 14Ohm resistance between VGH and GND. I replaced it and the display works fine for several weeks now.

Caused by the faulty cap, the display ran in a kind of emergency operation to prevent a permanent panel damage. This would explain the strange voltage levels of VGL.

Now:

VGH = 26.4V
VGL = -7.7V...

Re: DELL 3007 WPF blurry and slow

Hi Davi.p, thanks for your reply.

Here is a picture of the PCB:


Very well, I disassembled the display and powered it up while everything was connected.

I checked various control pads:

PWR_ON = 3.36V
VIN_18V = 17.7V
VCC = 3.37V
DVCC = 3.35V
AVCC = 3.37V
AVCC_25 = 2.59V
PS_ON = 3.37V
VDD = 15.2V ( IC "U7" generates VDD out of VIN_18V, depending on the used feedback resistors, 15.2V seems legit)

Seems ok so far....

Hello.

I recently got hands on a DELL 3007WPF with an unknown error. After I power it up, it runs through its full screen colour test cycle. The colour transitions appear very slow and blurry, including a few horizontal lines.

I created a youtube video to demonstrate the behaviour: [URL="https://www.youtube.com/watch?v=XekLz6xHGAA"]click[/URL]

Also, I connected the display to my pc and extended my desktop. The shown image was completely distorted. If I move my cursor, the display shows a vertical bar which reacts to my motion.

...

Re: New Members - please post your introductions here

Greetings from Germany!

Hi, my name is Frank and I found this forum a few days ago while searching for repair information for a Dell LCD. I fixed a couple of LCDs before, but now I really could use an advice.