LG 226WTX several seconds to white

[smason]

Got this nice 22 inch LG from a business associate who sold a client a new monitor to replace this one which is just out of warranty.

Just for something different, this one is several seconds to WHITE.
Never heard of an intermittent white screen before, it's usually lack of power/bad fuse.

I tested it first, sure enough a few seconds after power-on the screen goes white.

I disassembled it.
I can't believe that a 22 inch monitor has no screws holding the back "cage" on. Fairly easy to work on, removed the ps/inverter and inspected.
Samxon GFs at the output, one very slightly bulging.
Replaced all the caps including the 47@50 and 1@50 but not the 2 big ones.

Measuring the GFs revealed the following:

1000 @ 16 = 12uf 8.5ohm ESR
1000 @ 16 = 922uf .2 ohm ESR
1000 @ 25 = 250uf .5 ohm ESR
680 @ 25 = 606uf .1 ohm ESR
680 @ 25 = 612uf .1 ohm ESR

It's partially assembled and on test at the moment, so far looks really good.

[retiredcaps]

Re: LG 226WTX several seconds to white

Got this nice 22 inch LG

I'm jealous!

Samxon GFs at the output, one very slightly bulging.

Measuring the GFs revealed the following:

1000 @ 16 = 12uf 8.5ohm ESR
1000 @ 16 = 922uf .2 ohm ESR
1000 @ 25 = 250uf .5 ohm ESR
680 @ 25 = 606uf .1 ohm ESR
680 @ 25 = 612uf .1 ohm ESR

For the newbies, pay attention. smason noticed one bulging cap, but caps do not have to be bulged in order to be bad.

According to Samxon GF datasheet at

https://cdn.badcaps-static.com/pdfs/...f9651347cb.pdf

1000uF 16V, ESR should be 0.060 ohm
1000uF 25V, ESR should be 0.046 ohm
680uF 25V , ESR should be 0.060 ohm

Now compare these datasheet specifications with the readings that smason posted above.

[smason]

Re: LG 226WTX several seconds to white

I'm jealous!

For the newbies, pay attention. smason noticed one bulging cap, but caps do not have to be bulged in order to be bad.

And it was just barely bulged. 20 monitors ago I wouldn't have noticed it, it was pretty subtle.
I stared pretty hard to see it.

'course green GFs are replace on sight anyway.

[smason]

Re: LG 226WTX several seconds to white

And it was just barely bulged. 20 monitors ago I wouldn't have noticed it, it was pretty subtle.
I stared pretty hard to see it.

'course green GFs are replace on sight anyway.

Here are 4 of the caps, bloating just barely noticeable