Akai CT-T25PA3A - value of R2050

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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.


Re: Akai CT-T25PA3A - value of R2050


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



Re: Akai CT-T25PA3A - value of R2050


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

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Re: Akai CT-T25PA3A - value of R2050


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

Thanks,
Russell.


Re: Akai CT-T25PA3A - value of R2050


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

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Re: Akai CT-T25PA3A - value of R2050


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.


Re: Akai CT-T25PA3A - value of R2050


finger to keyboard and composed:

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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.

Re: Akai CT-T25PA3A - value of R2050


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.


Re: Akai CT-T25PA3A - value of R2050


finger to keyboard and composed:

Quoted text here. Click to load it

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

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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.

Re: Akai CT-T25PA3A - value of R2050


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

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