Hi,
I found an LG Flatron 795FT plus monitor...after checking and replacing
one diode and one mosfet I measured infinite resistance on the CRT
filament pins...I think it would be not possible that all the 3 RGB
filaments had broken, but in effect if I try to power the pins i see 0
Amps with an ammeter...

Is there someone that found the same fault??? Is it possible that a CRT
deads in this way??? Thanks.

Marco

Hello, !
You wrote on 28 Dec 2005 09:16:57 -0800:

m Is there someone that found the same fault??? Is it possible that a CRT
m deads in this way??? Thanks.


Yes, it's quite possible that the heater filaments have gone open circuit,
It doesn't happen often - but it happens. If you're sure you are measuring
the correct pins, then the CRT is useless.
Sorry!


With best regards, 3T39. E-mail:

On 28 Dec 2005 09:16:57 -0800, wrote:

Hi,
I found an LG Flatron 795FT plus monitor...after checking and replacing
one diode and one mosfet I measured infinite resistance on the CRT
filament pins...I think it would be not possible that all the 3 RGB
filaments had broken, but in effect if I try to power the pins i see 0
Amps with an ammeter...

Is there someone that found the same fault??? Is it possible that a CRT
deads in this way??? Thanks.

Marco

Most CRTs wire the heaters in series. The only one I've seen with a
single heater out was a 70's Sony.
Andy Cuffe

-- Use this address until 12/31/2005

-- Use this address after 12/31/2005

Hi, tnx for reply. I've looked into the bulb and i think the filaments
are in parallel....I ask: may be an open interconnection on the CRT
pins???

Thanks. Marco

It could be -- but a filament voltage derived from a winding
around a failing flyback transformer might take out all the
filaments.

wrote:
Hi, tnx for reply. I've looked into the bulb and i think the filaments
are in parallel....I ask: may be an open interconnection on the CRT
pins???

Thanks. Marco