Gateway Profile 4, 2 Seconds to Black

[TheZuke!]

Hello,
I just replaced 4 kzg 1500 ufd 16V (swollen) caps on the main board of a Gateway Profile 4 with
2 seconds to black symptom. (Display visible with flashlight) with 4 25V Low ESR caps.
(A Profile 4 is a combo PC and display .)

No change in the symptom.
A Gateway Profile thread from 2005 shows two types of main boards, mine is more like the "improved" one with a large heat sink near the caps. Testing/changing CCFL's is new to me.
I haven't removed the metal backing from the LCD display.

I guess to avoid appearing totally newb, I'll do some more searching on this site about testing inverters and CCFL's. but if you are familiar with specifics of this Gateway chimera, I'd be interested in some leads.

Thanks!

[Uranium-235]

Re: Gateway Profile 4, 2 Seconds to Black

if you can find the actual inverter circuit, it might be some tiny startup caps near that

[retiredcaps]

Re: Gateway Profile 4, 2 Seconds to Black

I guess to avoid appearing totally newb, I'll do some more searching on this site about testing inverters and CCFL's.

2 seconds to black can be

a) bad caps
b) bad ccfls
c) bad ccfl wiring (especially the return wiring)
d) bad secondary windings on the inverter transformer

More details starting with post #19 at

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

Also, see budm's Inverter tester using old CFL

https://www.badcaps.net/forum/showthread.php?t=19987

[TheZuke!]

Re: Gateway Profile 4, 2 Seconds to Black

Thanks for the replies and the links, I'm studying one of those now.

TheZuke!
dona nobis pacem

[TheZuke!]

Re: Gateway Profile 4, 2 Seconds to Black

There are a bunch (10+) of silver colored caps on the board as well, the tops have a blue part (negative lead mark?) and 860 4V, are these also "usual suspects"?