Dell 1703FPt Flashes on then off

[iusvir]

I have a Dell 1703FPt that will flash on for a second then off. The image is still there just the inverters appear to be shutting down.

With an ESR meter I found c809 to be bad. I have also replaced the caps that are green (this was before the esr Now I am stumped would appreciate the help.

No apparent burns on the inverter xfmers

This is the one piece psu/inverter design. See attached pics.

Thanks

Keith

[jayoung]

Re: Dell 1703FPt Flashes on then off

Sounds like 2 seconds to black. The following post is a Guide to Troubleshooting "2 Seconds to Black."

https://www.badcaps.net/forum/showthread.php?t=10419

Issues can include bad capacitors, bad transformers, bad ccfl's or ccfl wiring, bad transistors, etc.

[sabre504]

Re: Dell 1703FPt Flashes on then off

Have you checked the pico fuse ?

[selldoor]

Re: Dell 1703FPt Flashes on then off

I agree .read the guide. Personally I would try and check the inverter transformers first. I was trying to read the numbers off the one on the right to advise you which were the secondaries but couldnt quite make it out. Nor could I read the power supply board number. It is usual to have pictures looking straight down so that these can be read along with other board information. You should also post a picture of the underside.

[iusvir]

Re: Dell 1703FPt Flashes on then off

I found it!!!!! shorted wire on one of the CCFL's

Thanks for the input guys!!!

[selldoor]

Re: Dell 1703FPt Flashes on then off

Well Done!! Dont break it putting it back together

[smason]

Re: Dell 1703FPt Flashes on then off

Well Done!! Dont break it putting it back together

I HATE it when that happens.

[pedro]

Re: Dell 1703FPt Flashes on then off

Have you checked the pico fuse ?

??? if the backlights flash then the fuse is obviously intact.

[sabre504]

Re: Dell 1703FPt Flashes on then off

Had it happen to me before backlight flash pico on its way out changed and cured the fault .
Since then just change them anyway to play safe