Hitachi TV power problem

M

Mike C

Guest
Folks,

Can anybody point me in the right direction?

My daughter has a Hitachi model C1719T TV receiver with a problem. Nothing
appears on the screen - it remains completely black. I don't know if this
screen has a cold cathode (do you get such TV tubes?), but I can't see any
heater coming on, and I can't find any voltage around the tube base. It
generates UHT, however, because I hear it whistle momentarily when the power
is switched off.

Although I have fixed my own TV several years ago (thanks to a guy called
Sam who was a regular contributor to the group!), I don't know much outside
of the theory of TV's, and when I look at the board, I don't know enough to
recognise where the various circuit elements are - and I don't have a
schematic for it.

With the back of the board towards me and the components on the top, the
mains cable comes in on the left side, but I can't even find the rectifier.
Is it a 4-pin chip, or does it use discrete diodes? Is it near to the mains
cable and the fuse? It would make sense!

Any pointers will be appreciated.

Thanks,

Mike.

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Mental decryption required:
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Mike C wrote:
Folks,

Can anybody point me in the right direction?

My daughter has a Hitachi model C1719T TV receiver with a problem.
snip
Any pointers will be appreciated.

Thanks,

Mike.
Click to expand...
Hi, Mike. Try posting at sci.electronics.repair. They might be able
to give you a few pointers there.

Chris
 
On Sat, 03 Sep 2005 13:13:35 GMT, "Mike C" <My.address@end.of.post>
wrote:

Folks,

Can anybody point me in the right direction?

My daughter has a Hitachi model C1719T TV receiver with a problem. Nothing
appears on the screen - it remains completely black. I don't know if this
screen has a cold cathode (do you get such TV tubes?), but I can't see any
heater coming on, and I can't find any voltage around the tube base. It
generates UHT, however, because I hear it whistle momentarily when the power
is switched off.
Click to expand...
Is there any sound?

Tom

Although I have fixed my own TV several years ago (thanks to a guy called
Sam who was a regular contributor to the group!), I don't know much outside
of the theory of TV's, and when I look at the board, I don't know enough to
recognise where the various circuit elements are - and I don't have a
schematic for it.

With the back of the board towards me and the components on the top, the
mains cable comes in on the left side, but I can't even find the rectifier.
Is it a 4-pin chip, or does it use discrete diodes? Is it near to the mains
cable and the fuse? It would make sense!

Any pointers will be appreciated.

Thanks,

Mike.
Click to expand...
 
"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:mrtjh1d3llrbsicv5uin2k79os61suju6m@4ax.com...
On Sat, 03 Sep 2005 13:13:35 GMT, "Mike C" <My.address@end.of.post
wrote:

Folks,

Can anybody point me in the right direction?

My daughter has a Hitachi model C1719T TV receiver with a problem.
Nothing
appears on the screen - it remains completely black. I don't know if
this
screen has a cold cathode (do you get such TV tubes?), but I can't see
any
heater coming on, and I can't find any voltage around the tube base. It
generates UHT, however, because I hear it whistle momentarily when the
power
is switched off.

Is there any sound?

Tom

Thanks for the reply, Tom,
Click to expand...

No, there is no sound. Basically, it no longer has much to offer in the way
of entertainment! :)

Regards,

Mike.
 
On Sat, 03 Sep 2005 19:41:45 GMT, "Mike C" <My.address@end.of.post>
wrote:

"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:mrtjh1d3llrbsicv5uin2k79os61suju6m@4ax.com...
On Sat, 03 Sep 2005 13:13:35 GMT, "Mike C" <My.address@end.of.post
wrote:

Folks,

Can anybody point me in the right direction?

My daughter has a Hitachi model C1719T TV receiver with a problem.
Nothing
appears on the screen - it remains completely black. I don't know if
this
screen has a cold cathode (do you get such TV tubes?), but I can't see
any
heater coming on, and I can't find any voltage around the tube base. It
generates UHT, however, because I hear it whistle momentarily when the
power
is switched off.

Is there any sound?

Tom

Thanks for the reply, Tom,

No, there is no sound. Basically, it no longer has much to offer in the way
of entertainment! :)

Regards,

Mike.
Click to expand...
Then it is likely power supply/horizontal deflection.

Tom
 
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