LG Flatron E2050T Backlight

[crash-cyberdrive]

Hi Forum Members:

As of this writing I'm trying to figure out a back-light problem on a Flatron, apparently it is time for this model to also fail on LED Driver (back-light).

This model board is stupidly simple, so simple I was in awe about its size and design.

First the monitor when cold would work for about 5 minutes before starting to dim and then after dimming it flickers like crazy. Letting it warm up does nothing but to keep flickering, even after a soft reset (off/on/off/on) or hard reset (unplugging) does nothing to solve the issue.

This is what I have done so far:

• Test input power capacitors (Samyoung 16v 100uf HXB)
• Test Diodes and resistor close to the controller
• Test the voltage at the connector (valued at 40v but not stable, it got down to 20v)
• Test Polymer Aluminium can capacitors [Enercon VT series 16v 100uf] (one set was good, but one went off the scale)

Next thing I was thinking was replacing the capacitors on the power input and one of the same near the controller.
Should I take out all the capacitors to properly test them?
How about this one polymer cap that while testing in circuit read 7867uf?
Also I see a small (maybe eye effect) dome on the polymers.
Also to note this board was manufactured almost 5 years now.

Thank You for all your help and advice.

[budm]

Re: LG Flatron E2050T Backlight

Can you please up load the pictures of the whole backside of the monitor so we can see how it it is wired up.
It sounds to me like it has bad LEDs.

[crash-cyberdrive]

Re: LG Flatron E2050T Backlight

As Requested Pictures of the rear of the display.
BTW: Sorry for the delay its being a very work heavy week.

[crash-cyberdrive]

Re: LG Flatron E2050T Backlight

Did some heat re-flow to some of the components on the Driver side of the board as I saw a questionable joint on the MOSFET; Left the caps as they where because the one I already have though they are almost the same specs the where a bit too tall.