Please help with component Identification

[Gibbo]

No, the big red blob is clearly an MOV.

The big red blob is *clearly* a thermistor.

 

[Eeyore]

The big red blob is *clearly* a thermistor.

Clearly from function too.

The Z symbol on the solder resist side of the pcb is clearly a TVS to me.
http://en.wikipedia.org/wiki/Transient_voltage_suppression_diode
http://upload.wikimedia.org/wikiped...ient_voltage_suppression_diode_symbol.svg.png

Graham

 

[Stan]

I think that is what i said, that the red thinggie is truly a MOV,
but if you look at the designations at tbe bottom of the board where
there are *no* "space limitations", the R and Z designators are
bass-ackwards.

I'm 99% certain the red thinggie is not a MOV but a thermistor. It has
markings "Sincera 8R0M", I have removed it from the PCB and at room
temperature it has a low resistance of 8 Ohm, when hot (left on heater
for a while) i measured it at 80 Ohm's. So..i don't think the R & Z
designators are switched because using a "Z" designator for a
thermistor would be very odd. I'm certain Z801 is the correct
designator for the mystery component.

 

[Stan]

It's a Sg-Gap sg99b3en.

Do you have a datasheet or URL to find further information?
I did a search and found a couple of TV service manuals which appear
to use such a device but no useful information.Who manufacturers that
component? The manual was for a Toshiba but i couldn't find the
component on Toshiba's semiconductor site. Thanks..Stan

 

[Stan]

That pretty much takes care of that - it's a MLCC in a glass package.
Maybe designed to be very lossy, like a whole snubber in one 2-pin part.

Cheers!
Rich

You could be right, i will look into this. Thanks

 

[Eeyore]

I'm 99% certain the red thinggie is not a MOV but a thermistor. It has
markings "Sincera 8R0M", I have removed it from the PCB and at room
temperature it has a low resistance of 8 Ohm, when hot (left on heater
for a while) i measured it at 80 Ohm's. So..i don't think the R & Z
designators are switched because using a "Z" designator for a
thermistor would be very odd. I'm certain Z801 is the correct
designator for the mystery component.

No question about it since you can see from the pcb layout that the thermistor is
in series with the degausing coil which is what you'd expect !

Graham

 

[[email protected]]

Do you have a datasheet or URL to find further information?
I did a search and found a couple of TV service manuals which appear
to use such a device but no useful information.Who manufacturers that
component? The manual was for a Toshiba but i couldn't find the
component on Toshiba's semiconductor site. Thanks..Stan

The manufacturer is General Semiconductor.

 

[[email protected]]

?? A search on all of that or either half gave nothing.
Whazzit?- Hide quoted text -

It's a suppressor diode made by General Semiconductor, they got bought
out by Vishay. I doubt they make it anymore though.

 

[[email protected]]

You could be right, i will look into this. Thanks

you could try substituting one of these trans-zorbs by Vishay...
http://www.vishay.com/diodes/protection-tvs-esd/trans-zorb/

 

[Robert Baer]

Gibbo wrote:




Clearly from function too.

The Z symbol on the solder resist side of the pcb is clearly a TVS to me.
http://en.wikipedia.org/wiki/Transient_voltage_suppression_diode
http://upload.wikimedia.org/wikiped...ient_voltage_suppression_diode_symbol.svg.png

Graham

I agree.
Also, the designations are bass ackwards as i mentioned; the parts
may be correct, but the "schematic" leaves a bit to be desired.
So, if it indeed is a thermistor (possible) then they are really
messed up.

 

[Eeyore]

I agree.
Also, the designations are bass ackwards as i mentioned

If you correct for the 'upside-down' ness of looking at the resist side, there's nothing wrong with the pcb legending at all !

Graham

 

[Robert Baer]

Robert Baer wrote:




If you correct for the 'upside-down' ness of looking at the resist side, there's nothing wrong with the pcb legending at all !

Graham

Look rather carefully; one part is close to the side of the relay and
both leads are "within" the relay length; the other is further away and
mostly off the "end" of the relay.

 

[Gibbo]

Look rather carefully; one part is close to the side of the relay and
both leads are "within" the relay length; the other is further away and
mostly off the "end" of the relay.

Eh?

The PCB is correct.

R803 is closest to the relay in both photos. It is shown on the solder
side with a resistor symbol and designated below it, upside down, as
"R803". It is designated in the closest position possible. One leg
protrudes very slightly beyond the end of the relay. It is a thermistor.
It is a red blob.

Z801 is further away from the relay in both photos. It is the glass
thing in question. It is shown on the solder side with a "tranzorb" type
symbol and is marked as "Z801" right next to the symbol. It is within
the length of the relay.

I'm baffled where the confusion lies about which component is which. It
is *very* clear to me and the PCB is correct.