Panasonic TV

[Gummo]

When I try to turn on from standby the only response from the set is that
the standby light goes off, followed by a bird-like cheeping sound which
lasts 6 seconds when the set goes back to standby.



Any ideas?



Gummo

 

[Meat Plow]

When I try to turn on from standby the only response from the set is that
the standby light goes off, followed by a bird-like cheeping sound which
lasts 6 seconds when the set goes back to standby.



Any ideas?

If you've never fixed a TV, get it to someone who can.

 

[BH]

If you've never fixed a TV, get it to someone who can.

Meat Plow:

I ran a fairly large service operation back in the '60's and I've just
got to love some of your comments.

Right on!

BH

 

[AJ]

Check for excessive loads on the power supply inclusive of shorted H-output,
audio output, etc. Chirping noise is the SMPS informing you there is
something overloading one or more of the supplies. BTW ignore the trolls,
post what actual diagostics you have actually done along with the model and
chassis numbers of the set.

 

[Meat Plow]

Meat Plow:

I ran a fairly large service operation back in the '60's and I've just
got to love some of your comments.

Right on!

BH

I did major manufacturer warranty consumer electronics in the 80's. At one
point I worked 9-5 then 6-9 part time. When someone posts a message in a
repair group describing symptoms but not giving any background in what
they know I have to assume they know nothing and give them an honest
and appropriate answer given what's currently known. I could have told the
OP to check the smps for high esr caps and a host of other things but
usually someone else chimes in with that stuff. Plus, I'm out of the loop
on many newer smps designs having more experience with the old RCA scr
output sets, tube sets, and more simple portables. I did however fix my
52" Panasonic set when it blew the STK devices in the convergence. That
was my first and a wonderful experience here in sci.electronics.repair
when I posted a couple messages seeking help and got it.

 

[Meat Plow]

Check for excessive loads on the power supply inclusive of shorted H-output,
audio output, etc. Chirping noise is the SMPS informing you there is
something overloading one or more of the supplies. BTW ignore the trolls,
post what actual diagostics you have actually done along with the model and
chassis numbers of the set.

Bird-like cheeping was the OP's diagnostics.

 

[Gummo]

If you've never fixed a TV, get it to someone who can.

I was hoping to avoid hauling the brute to the engineer by dint of one of
you boffins' declaration that the set was beyond fixing (via its
Springwatch-esque symptoms}.

Gummo

 

[Gummo]

Check for excessive loads on the power supply inclusive of shorted
H-output, audio output, etc. Chirping noise is the SMPS informing you
there is something overloading one or more of the supplies. BTW ignore the
trolls, post what actual diagostics you have actually done along with the
model and chassis numbers of the set.

Thanks AJ. Unfortunately, I haven't a clue about electronics repair; I was
just wondering if it was worth taking to the engineer which I will do
tomorrow based on your recommendation.

Gummo

 

[Jerry G.]

You'll have to give the set out for this one. It is impossible to guess at
this type of problems without troubleshooting the set. Most of the failures
are in the scan amplifiers and the power supply.

--

Jerry G.
======


When I try to turn on from standby the only response from the set is that
the standby light goes off, followed by a bird-like cheeping sound which
lasts 6 seconds when the set goes back to standby.



Any ideas?



Gummo

 

[Gummo]

You'll have to give the set out for this one. It is impossible to guess
at
this type of problems without troubleshooting the set. Most of the
failures
are in the scan amplifiers and the power supply.

Thanks Jerry - will do.

Gummo

 

[Meat Plow]

I was hoping to avoid hauling the brute to the engineer by dint of one of
you boffins' declaration that the set was beyond fixing (via its
Springwatch-esque symptoms}.

Well you never mentioned how old it was and that would help.

 

[Gummo]

Well you never mentioned how old it was and that would help.

Apologies - it would've made sense. It's a 1998 Panasonic TX-25MK1L.

Gummo

 

[Meat Plow]

Apologies - it would've made sense. It's a 1998 Panasonic TX-25MK1L.

Gummo

Not too old for a trip to as you put it "the engineer." Get a quote on the
cost of repair before it's worked on and post it here. See if you can get
details as to what's at fault. This is a set I could work on provided I
had the service manual, dusted off my scope, cleaned off my best
reading glasses and cleared all the crap off my bench

 

[Gummo]

Not too old for a trip to as you put it "the engineer." Get a quote on the
cost of repair before it's worked on and post it here. See if you can get
details as to what's at fault. This is a set I could work on provided I
had the service manual, dusted off my scope, cleaned off my best
reading glasses and cleared all the crap off my bench

Will do - thanks.

Gummo

 

[Gummo]

You'll have to give the set out for this one. It is impossible to guess
at
this type of problems without troubleshooting the set. Most of the
failures
are in the scan amplifiers and the power supply.

I was recommended a good engineer who fixed the set for £30.

Thanks to all.

Gummo