Packard Bell FT700 Monitor

[Richard]

Can anyone explain this:

There seems to be a design fault with the Packard Bell FT700 (Mk1) LCD PC
monitor. That's why they came out with a later version.

But, anyway, what happens is that after about 12 months or so, the backlight
begins to turns itself off not long after swith on and consequently you get
a blank screen. But, if you toggle the power on and off, that is either
unplug and then plug in the monitor, or toggle the switch on the plug socket
on an off, you can eventually get the screen to remain on.

Okay you electronics experts, what might explian the fault? Once you can get
the screen to stay on, it stays on indefinitely. That's weird.

Thanks.

 

[Jerry G.]

A common fault is the inverter board, and sometimes the back-plane
lamps in the screen. The fix is to change the inverter board and the
lamps.

I don't think Packard Bell will sell you the parts directly. This
would have to be serviced by their authorized service rep. Call them
to find out if the monitor is under warranty. Many of these TFT
monitors have 2 or 3 year warranties.

If the monitor is out of warranty and if it is a low cost TFT monitor,
it may pay to simply replace it. Get an estimate to have it serviced
if it is out of warranty.



Jerry G.
======

 

[Richard]

A common fault is the inverter board, and sometimes the back-plane
lamps in the screen. The fix is to change the inverter board and the
lamps.

I don't think Packard Bell will sell you the parts directly. This
would have to be serviced by their authorized service rep. Call them
to find out if the monitor is under warranty. Many of these TFT
monitors have 2 or 3 year warranties.

If the monitor is out of warranty and if it is a low cost TFT monitor,
it may pay to simply replace it. Get an estimate to have it serviced
if it is out of warranty.



Jerry G.
======

Jerry

In the end I discovered that if air in blown onto the boards, the monitor
can be made to stay on rather than cutting out. So, I now have an old PC fan
affixed to the back of the monitor and all is working okay. If I turn the
fan off, the monitor goes dead.

This works but in not an elegant solution. It might be possible to sych out
the particular component that's causing the trouble by directing cold onto a
specific component, but that's beyond me at present.

Cooling something is curing the problem.

 

[Resqueline]

For those Googling, here's a possible solution provided by a kind soul:

I fixed the same issue as follows:
Replace C809 and C811, electrolytic caps 330µF and 680µF respectively, both 16V, on supply board.
I used one 390µF respectively two 390µF paralleled.
Hope this can help.
cheers,
Olivier