It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth a
punt just replacing it?

--
*Tell me to 'stuff it' - I'm a taxidermist.

Dave Plowman London SW
To e-mail, change noise into sound.

On 07/07/2018 17:37, Dave Plowman (News) wrote:
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth a
punt just replacing it?


That's a mains voltage SM chip, there's a data sheet with suggested
circuits. If it's blown itself apart it would seem a good idea to check
the mains reservoir cap along with both the diodes hanging off the Drain
pin.

https://www.power.com/sites/default/...top242-250.pdf

"Dave Plowman (News)" wrote:
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth a
punt just replacing it?

Seems like it's the switching PSU chip:
https://www.power.com/sites/default/...top242-250.pdf

Depends how much you like debugging SMPSUs (given it may have blown
something else as well).

Theo

"Dave Plowman (News)" wrote in message
...
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth a
punt just replacing it?

Likely given the best price is so low.

I hate switch mode devices with a passion.
Brian

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"Lee" wrote in message
...
On 07/07/2018 17:37, Dave Plowman (News) wrote:
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth
a
punt just replacing it?


That's a mains voltage SM chip, there's a data sheet with suggested
circuits. If it's blown itself apart it would seem a good idea to check
the mains reservoir cap along with both the diodes hanging off the Drain
pin.

https://www.power.com/sites/default/...top242-250.pdf

However as has been said check the rest of the components in the circuit.
These things seldom self destruct without good reason like a short or some
kind of change to its input.
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Jeff" wrote in message
...


"Dave Plowman (News)" wrote in message
...
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth
a
punt just replacing it?

Likely given the best price is so low.

Brian Gaff wrote

I hate switch mode devices with a passion.

I prefer them but don’t usually bother to repair
them unless its something very simple like the
input bridge etc and it hardly ever is.

They're so cheap now that its not worth my time.

"Lee" wrote in message
...
On 07/07/2018 17:37, Dave Plowman (News) wrote:
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth
a
punt just replacing it?


That's a mains voltage SM chip, there's a data sheet with suggested
circuits. If it's blown itself apart it would seem a good idea to check
the mains reservoir cap along with both the diodes hanging off the Drain
pin.

https://www.power.com/sites/default/...top242-250.pdf

Brian Gaff wrote

However as has been said check the rest of the components in the circuit.

I wouldn’t bother myself given how fiddly that is to do with SMPSs
given that the ones that are easy to check wont produce that symptom.

These things seldom self destruct without good reason like a short or some
kind of change to its input.

Sure, but its not that easy to check the stuff that can kill that thing.
It’s almost the entire active semis in the power supply and it isnt
that likely that a failure of whats downstream of it will kill it like
that or that easy to replace if it has either.

"Jeff" wrote in message
...


"Dave Plowman (News)" wrote in message
...
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth
a
punt just replacing it?

Likely given the best price is so low.

"Jeff" wrote in message
...

"Dave Plowman (News)" wrote in message
...
It's an elderly FreeView tuner. Have a few used only for radio.
One has failed. The TOP 244Y chip has blown apart. Think it is basically
just the on/off switch on the DC side. Nothing else looks damaged. Worth
a punt just replacing it?

Likely given the best price is so low.

Makes more sense to get this.
https://www.ebay.co.uk/itm/SONY-VTX-...AOSw~CFY7Pl 8