TVR 10241 capacitor ???

[BigBadger]

Hi,
I've been given a friends PC Power supply to repair. It's a Enermax EG651
(550W) model. It was damaged when he plugged it into a 240V supply while
the voltage select switch was on 115V (Doh!!).

Anyway a quick visual shows that two large ceramic disk capacitors are
blown. The capacitors are mounted next to where the wire from the voltage
select switch joins the pcb. They are marked Z1 and Z2 on the pcb and TVR
10241 on the components themselves, they are about 10mm diameter.

Does anyone know what rating these are?

Also if anyone knows what further damege may have been done (hopefully none
)

Replace 'NOSPAM' with 'btinternet' to reply to my email.

 

[Tim Wescott]

Hi,
I've been given a friends PC Power supply to repair. It's a Enermax EG651
(550W) model. It was damaged when he plugged it into a 240V supply while
the voltage select switch was on 115V (Doh!!).

Anyway a quick visual shows that two large ceramic disk capacitors are
blown. The capacitors are mounted next to where the wire from the voltage
select switch joins the pcb. They are marked Z1 and Z2 on the pcb and TVR
10241 on the components themselves, they are about 10mm diameter.

Does anyone know what rating these are?

Also if anyone knows what further damege may have been done (hopefully none
)

Replace 'NOSPAM' with 'btinternet' to reply to my email.

It sounds more like MOV surge arrestors -- particularly if there are
other caps marked 'C'.

But the real answer is that when you do something like that you
generally do widespread damage. I would expect that anything on the HV
side that's not taken out has been stressed and will fail later.

 

[BigBadger]

It sounds more like MOV surge arrestors -- particularly if there are
other caps marked 'C'.

But the real answer is that when you do something like that you
generally do widespread damage. I would expect that anything on the HV
side that's not taken out has been stressed and will fail later.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Tim,
You may be right there. all the capacitors are indeed marked 'C'. It sure
looks like a capacitor though. Are MOV surge arrestors easily available?

 

[Tim Wescott]

Tim,
You may be right there. all the capacitors are indeed marked 'C'. It sure
looks like a capacitor though. Are MOV surge arrestors easily available?

MOV's are easily available, and all the ones I've seen look like large,
fat caps (usually in garish colors).

NTE "makes" them; you can get them from Mouser, Digi-Key, etc.

 

[Peter A Forbes]

Tim,
You may be right there. all the capacitors are indeed marked 'C'. It sure
looks like a capacitor though. Are MOV surge arrestors easily available?

Yes, most distributors like RS stock them (Philips and GE by memory)

The last 5 digits of the Philips number is the specifiying part, and yours have
5 digits so it is 'just' possible they are of that make.

We use a 130V type on one of our chargers, but yours may be higher voltage.

Peter

 

[Peter A Forbes]

Yes, most distributors like RS stock them (Philips and GE by memory)

The last 5 digits of the Philips number is the specifiying part, and yours have
5 digits so it is 'just' possible they are of that make.

We use a 130V type on one of our chargers, but yours may be higher voltage.

Peter

Found a part that matches, made by Thinking Electronics, pdf file available:

203.75.156.140/thinking/ products1/pdf/varistor%5CTvr-d.pdf

You'll need to complete the url...

That range of varistors doesn't appear on their website now:

http://www.thinking.com.tw/english/all02_01.htm

Peter

 

[BigBadger]

Found a part that matches, made by Thinking Electronics, pdf file available:

203.75.156.140/thinking/ products1/pdf/varistor%5CTvr-d.pdf

You'll need to complete the url...

That range of varistors doesn't appear on their website now:

http://www.thinking.com.tw/english/all02_01.htm

Peter

--
Peter & Rita Forbes
[email protected]
Engine pages for preservation info:
http://www.oldengine.org/members/diesel

Thanks!

 

[Graham W]

Hi,
I've been given a friends PC Power supply to repair. It's a Enermax
EG651 (550W) model. It was damaged when he plugged it into a 240V
supply while the voltage select switch was on 115V (Doh!!).

Anyway a quick visual shows that two large ceramic disk capacitors are
blown. The capacitors are mounted next to where the wire from the
voltage select switch joins the pcb. They are marked Z1 and Z2 on the
pcb and TVR 10241 on the components themselves, they are about 10mm
diameter.

Throw it away! Seriously, new PC PSUs are under £35 (GBP) and it
isn't worth chasing the successive blown components in this over-volted
unit. Since the MOVs (which is what they are) do not take part in the
ordinairy operation of the supply but serve to protect it against voltage
surges, if the supply is not now working then there certainly is further
damage.

Replace the whole thing.

 

[BigBadger]

-
*****Replace 'NOSPAM' with 'btinternet' in the reply address*****

Throw it away! Seriously, new PC PSUs are under £35 (GBP) and it
isn't worth chasing the successive blown components in this over-volted
unit. Since the MOVs (which is what they are) do not take part in the
ordinairy operation of the supply but serve to protect it against voltage
surges, if the supply is not now working then there certainly is further
damage.

Replace the whole thing.

Graham,
I removed the MOV's and replaced the fuse and now the PSU is back up and
running (apparently) perfectly. It would appear my friend has been lucky and
no further damage was caused... Maybe some of the components will fail over
time but I'm reluctant to throw away a working PSU.

 

[Graham W]

-
*****Replace 'NOSPAM' with 'btinternet' in the reply address*****

Graham,
I removed the MOV's and replaced the fuse and now the PSU is back
up and running (apparently) perfectly. It would appear my friend has
been lucky and no further damage was caused... Maybe some of the
components will fail over time but I'm reluctant to throw away a
working PSU.

Well, it's your call of course. But I'd replace it rather than risk a
grand's
worth of hardware and priceless data on a PSU which has had the
equivalent of a coronary! For the sake of £35 (or less)...