Akai CT-T25PA3A - value of R2050

[Griff]

Greetings group.
Akai ctv model CT-T25PA3A

Burning smell then no picture.

R2050 open circuit and black on neck board.
This is connected to the 130v supply via CN2001.


Could someone please tell me the value/wattage and if it is a fuseable
resistor.

Thanks,
Russell Griffiths.

 

[Griff]

Sorry group.
I forgot to mention that I could find no cause for the resistor
burning up.
Can anyone suggest what might have caused it to happen.

Russell Griffiths

 

[Rudolf]

Hi,

From experience, use 10R resistor. Original is 100R and it goes.
I think, slight aging of the tube causes current increase and 100R gets
cooked. 10R seem to survive for longer.

Just in case, check soldering on the RGB amplifiers and electrolitic
capacitor in 130V line, but resistor should be the only fault.

Rudolf

"Griff" <rg26ce1991@hotmail.com> wrote in message
news:1174021625.898649.241190@n59g2000hsh.googlegroups.com...

Greetings group.
Akai ctv model CT-T25PA3A

Burning smell then no picture.

R2050 open circuit and black on neck board.
This is connected to the 130v supply via CN2001.


Could someone please tell me the value/wattage and if it is a fuseable
resistor.

Thanks,
Russell Griffiths.

 

[Griff]

Thanks for the reply Rudolf.
Would I be right in thinking it should be a fuseable 10ohm resistor?

Thanks,
Russell.

 

[Rudolf]

I do not think it really matters. If something in RGB amps circuitry dies,
even non-fusable will blow, although it would take longer and will be some
smoke.

I am pretty sure original was not fusable anyway.

Rudolf

"Griff" <rg26ce1991@hotmail.com> wrote in message
news:1174342933.578024.180330@p15g2000hsd.googlegroups.com...

Thanks for the reply Rudolf.
Would I be right in thinking it should be a fuseable 10ohm resistor?

Thanks,
Russell.

 

[Griff]

I put in a 10ohm 1/4watt, and it started to smell straight away.
After 2 hours use, the tv is still working but the resistor is a
little bit dark.

I have ordered a 10ohm 1/2watt fuseable resistor.

Russell.

 

[Franc Zabkar]

On 27 Mar 2007 01:51:55 -0700, "Griff" <rg26ce1991@hotmail.com> put
finger to keyboard and composed:

I put in a 10ohm 1/4watt, and it started to smell straight away.
After 2 hours use, the tv is still working but the resistor is a
little bit dark.

I have ordered a 10ohm 1/2watt fuseable resistor.

Russell.

If a 10 ohm resistor is dissipating more than 1/4W, then the current
must be more than 160mA. This means that the 130V supply must be
delivering more than 20W of power to the CRT neck. Does this make
sense? Furthermore, since the beam current is never (?) more than
about 1mA, this suggests to me that something is seriously wrong.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[Griff]

Thanks for the contribution Frank.
I have put in the 1/2 10ohm fuseable resistor and tested the tv for 18
hours.
So far everything seems fine.

I don't know what else I can do.

Russell.

 

[Franc Zabkar]

On 5 Apr 2007 00:06:19 -0700, "Griff" <rg26ce1991@hotmail.com> put
finger to keyboard and composed:

Thanks for the contribution Frank.
I have put in the 1/2 10ohm fuseable resistor and tested the tv for 18
hours.
So far everything seems fine.

Try a bright white test pattern at max contrast. That should be a
worst case scenario.

I don't know what else I can do.

Russell.

Measure the voltage across the resistor? Check whether any of the RGB
amps run hotter than the others?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[Rudolf]

I did not go too deep into it. Friend does warranty work for AKAI and says
that changing value of resistor fixes the TVs and they do not come back.

Rudolf

"Griff" <rg26ce1991@hotmail.com> wrote in message
news:1175756779.649984.302250@w1g2000hsg.googlegroups.com...

Thanks for the contribution Frank.
I have put in the 1/2 10ohm fuseable resistor and tested the tv for 18
hours.
So far everything seems fine.

I don't know what else I can do.

Russell.