Identifying EL-backlight for LCD

[Hallvard Tangeraas]

I'm servicing a friend's music sampler (Akai S-1100) which has a worn
out backlight for the LCD. As far as I can tell, this is of the
"electro-luminensce" (EL) type.

It's very thin, has two electrodes fastened to one end (which is
attached via a cable to a small transformer). It's pink on one side
and silver on the other and has a transparent coating over both sides.
It doesn't light up at all (which I'm sure I would see if it did light
up), so I suppose it's dead.

I'm trying to find out where to get hold of a new one, but before that
I need to know what to ask for (manufacturer, model number etc.).

It's marked as follows on the silver (back) side:

PW01-397C
10125 0118


Can anyone recognize it?



Hallvard

 

[John Fields]

I'm servicing a friend's music sampler (Akai S-1100) which has a worn
out backlight for the LCD. As far as I can tell, this is of the
"electro-luminensce" (EL) type.

It's very thin, has two electrodes fastened to one end (which is
attached via a cable to a small transformer). It's pink on one side
and silver on the other and has a transparent coating over both sides.
It doesn't light up at all (which I'm sure I would see if it did light
up), so I suppose it's dead.

---
It may be that the inverter is dead, not the lamp.

With the lamp disconnected from the transformer, check the resistance
across the lamp terminals. It should be infinite. If it isn't it's
bad. Also, if it's not shorted, check the capacitance acoss the
lamp's teminals. It should be in the range of tens to hundreds of
nanofarads. If it's OK, then check the inverter with the lamp plugged
in. It should should put out high voltage AC; probably less than a
couple of hundred volts peak-to-peak and less than 2000 Hz. (WAG, it
depends...)

Bottom line is if your inverter works but the lamp stays dark then
yeah, it's the lamp.

 

[Roger Gt]

X-No-Archive: yes
: (Hallvard Tangeraas) wrote:
:
: >I'm servicing a friend's music sampler (Akai S-1100) which has
a worn
: >out backlight for the LCD. As far as I can tell, this is of the
: >"electro-luminensce" (EL) type.
: >
: >It's very thin, has two electrodes fastened to one end (which
is
: >attached via a cable to a small transformer). It's pink on one
side
: >and silver on the other and has a transparent coating over both
sides.
: >It doesn't light up at all (which I'm sure I would see if it
did light
: >up), so I suppose it's dead.
:
: ---
: It may be that the inverter is dead, not the lamp.
:
: With the lamp disconnected from the transformer, check the
resistance
: across the lamp terminals. It should be infinite. If it isn't
it's
: bad. Also, if it's not shorted, check the capacitance across
the
: lamp's terminals. It should be in the range of tens to hundreds
of
: nanofarads. If it's OK, then check the inverter with the lamp
plugged
: in. It should should put out high voltage AC; probably less
than a
: couple of hundred volts peak-to-peak and less than 2000 Hz.
(WAG, it
: depends...)
:
: Bottom line is if your inverter works but the lamp stays dark
then
: yeah, it's the lamp.
:

It is probably the inverter. however if you can isolate the two
terminals for the lamp -- And only if you can. You can test the
lame by connecting it to a source of 120VAC at 50 or 60 HZ. In
reduced light it should light. If it lights the inverter has
failed. A voltmeter across the two terminals of the inverter
should show about 120 to 140 Vac at about 400 to 2,000 HZ.