Sony KV-9PT20 Troubleshooting

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Troubleshooting Sony KV-9PT20 9 in. Television, Support & Service

Sony KV-9PT20

Vertical is slowing shrinking, any ideas?

1 Solution

What I found was IC202 9v regulator in the vertical circuit going bad.

Sony KV-9PT20 Can't Remember Channels!

It can move up channels and I can enter channels.
When I autoscan channels it works. When I push + and -, I see channels supposedly being added.
BUT, when I push the Channel Up button to look at the channels, NOTHING has changed.
This happened over 1 year ago. I don't know why but now it refuses to remember, add or delete
channels.
Can’t remember channels.
Why?
Chip? Battery? Remote?
Why?
Why doesn't anyone know? I've asked this last year and no one ever answers!
Why?

1 Solutions

I plug in my TV directly into the wall electric socket. I don't experience the power going out.
So this means my TV's standby power supply is bad?
But you see, my TV won't remember channels EVEN when it's left On after I supposedly
Autoprogram, Add or Delete channels. I see the TV autoprogramming through the channels (scanning
the channels) and I see the green Add and Delete symbols when I push add or delete. But even
without turning off the TV, I still CAN'T scroll to the channels that I supposedly just added. It's like
it pretended to add/delete channels but it didn't do anything. Like the memory is locked (locked to
what I set 2 years ago) somehow.
Other than that, my TV works perfectly with my remote. I can manually type in channels and push
Enter and it goes to the channel. I just can't get my TV to remember channels that it currently
doesn't have saved in the memory.
I always have to use the manual channel entry method which makes channel surfing very slow.
Do you think this is cheap to fix/diagnose at TV repair shop? My last Trinitron cost $100 to replace
the power supply but in that case my TV was really dead (wouldn't turn on).

2 Solutions

Do you have the set plugged in to an outlet that the power is being switched off? Some users plug
their set in to an outlet that they have a light switch on, and are killing the power to the set as
well. Most of these sets use a volatile memory for the simple things such as channel set-up. The
factory set-up is written to an EEPROM that is in part of the main uPC.
If your set is connected to a proper AC outlet that has constant un-interrupted power, then there
may be a fault with the standby supply, or there is a defect in the circuit area for the uPC.

3 Solutions

This can still be a fault in the standby section of the power supply. Some models have a separate
circuit entirely for the standby supply. If the standby supply is working properly, then this can be
something to do with how the uPC is operating.
If you are skilled to some degree in electronics and to some degree in TV service, you can do some
basic checks providing you are familiar with TV sets, and have the service manual. If the problem is
complex, this will not be repairs you can do at home with a simple DVM. If this is not something
that is easy to visually spot or check with a simple DVM, you will have to give the set to the
Panasonic authorized service centre to have it repaired properly. They have the proper tools to
troubleshoot the operation of the uPC in the set, and the internal software.

4 Solutions

Are you running the set on an outlet that is switched with the AC mains? On most sets, if you cut
the power to the mains, the channel memory will not keep. If the standby supply is going efective,
this can also happen.

5 Solutions

I plug in my TV into the wall electric socket. I don't experience the power going out.
So this means my TV's standby power supply is bad?
But you see, my TV won't remember channels EVEN when it's left On after I supposedly
Autoprogram, Add or Delete channels. I see the TV autoprogramming through the channels
(scanning the channels) and I see the Add and Delete symbols when I push add or delete. But even
without turning off the TV, I still CAN'T scroll to the channels that I supposedly just added. It's like
it pretended to add/delete channels but it didn't do anything. Like the memory is locked (locked to
what I set 2 years ago) somehow.
Other than that, my TV works perfectly. I can manually type in channels and push Enter and it goes
to the channel. I just can't get my TV to remember channels that it currently doesn't have saved in
the memory.
I always have to use the manual channel entry method which makes channel surfing very slow.

Magno Stedile
[e-mail]