Does anyone recognise this symbol?

[ElectricBabe]

Hello everyone!
I'm new here and a bit of an electronics novice, so i need some help!
Im trying to fix my Philips TV and have hit a bit of a 'roadblock' . The tv is getting no power . There are few caps blown but I think the problem is a small component next to the fuse.. The problem is I'm not sure what it is! It looks like a small resistor and the symbol is similar to that of a resistor but with rounded edges...not one I've seen before. Does anybody know what it is and where I can find a replacement?
Thanks
Joanne

 

[KrisBlueNZ]

Hi Joanne and welcome to Electronics Point

Can you upload some pictures? The component and/or its circuit symbol?

 

[ElectricBabe]

 

[KrisBlueNZ]

Got it. I'm not sure what it is either. Could be a thermistor. What does the component look like?

 

[ElectricBabe]

A small resistor looking thing, but its transparent in the middle. Its arcing across when the power plug is plugged in. Does it being next to the fuse give any hints?

 

[KrisBlueNZ]

No. Can you upload a photo of it?

 

[Harald Kapp]

Yep, pictures would be fine.
Does it look like one of these:

Then chances are it is a ceramic filter (see 1207 and 1104 here).

 

[ElectricBabe]

Not until later, I thrust it upon my dad to take to maplins, to see if they had any idea, and he isnt back until later

 

[Harald Kapp]

Well, arcing doesn't sound like a ceramic filter, more like a fuse that has blown.

Sorry I missed the part of the conversation before my post while I was googling )

 

[KrisBlueNZ]

Probably best to wait till then.

It seems odd that the symbol looks like a resistor with an obround around it, it looks like a fuse or maybe a spark gap, and it's arcing. Doesn't sound like anything I recognise.

Is there a circuit reference printed on the board beside the position?

I'm going to sleep now but Harald will sort you out

 

[ElectricBabe]

The symbol is like that, but with a ---/\/\/\/\/\/---
In the middle

 

[ElectricBabe]

The reference is RA8002 , thank you for your help

 

[davenn]

That's commonly the symbol for a fusible resistor

 

[KrisBlueNZ]

That seems like a good explanation Dave. The description doesn't really sound like a fusible resistor, but we will see...

Joanne, what is the model number of the TV set?

Can you post in-focus pictures of both sides of the circuit board in that area?

 

[Y2KEDDIE]

It may be a VDR (Voltage Dependent Resistor). Bascly a thermistor. Used for supressing power surges. It has a high resistance when cold and decreases as current flows though it. Try placing a 100 watt incadescent light bulb in the circuit in place of the device. Tthe bulb should light and the cicuit power up.

 

[shrtrnd]

I can't say with certainty, but I'm with davenn on this. The oval circle is the generic symbol for a fuse, the resistor in the middle of it would indicate a fusible resistor to me.
With engineers being trained us U.S. schools, European schools, and wherever the engineers are coming from for Pacific Rim products, it's hard sometimes to keep-up with
whose symbols or combinations of symbols are being used anymore.

 

[Arouse1973]

I can't say with certainty, but I'm with davenn on this. The oval circle is the generic symbol for a fuse, the resistor in the middle of it would indicate a fusible resistor to me.
With engineers being trained us U.S. schools, European schools, and wherever the engineers are coming from for Pacific Rim products, it's hard sometimes to keep-up with
whose symbols or combinations of symbols are being used anymore.

The barreter has a oval circle and is not a fuse. I dont think we can make that assumption. It depends if you use IEEE or ANSI I guess.
Thanks Adam

 

[davenn]

The barreter has a oval circle and is not a fuse

that takes me back to the tube radio days !!
not something you typically see or hear of in modern electronics

 

[(*steve*)]

The barreter has a oval circle and is not a fuse.

that takes me back to the tube radio days !!

It has been a long time since any of my cars had one either!

More seriously, are they at all related to platinum RTDs?

 

[FirstSpear]

Howdy. Did a search for RA8002 and found this pdf

https://www.epm.com.co/site/Portals...ecnicas/NORMARA8-002_revision2010_VFINAL1.pdf

Yep it is in Spanish, but the title at the top of each page reads, "Current limiting resistors for the protection of transformers..." Corriente = current, fusible = fuse; much is readily translatable as the electronic terms are very similar to the English. It contains some photos, and a cutaway diagram of the internal makeup of the device. It does, though, deal with very high voltages, but given all the speculation about fusible resistors, it seemed worth the post.

To muddy the waters further... The diagram presented in the thread is a schematic, and that outline resembles a crystal to me. Just saying.