Toshiba bad resistor

[BestYohman]

I have a Toshiba TV that a 5w 1.8 ohm resistor went bad. All I have on hand is a 5w 3 ohm resistor. Would I be hurting anything by using this?

[dskall]

Re: Toshiba bad resistor

The question you might want to be asking is why the resistor went bad.

[budm]

Re: Toshiba bad resistor

It sounds like the relay that is supposed to bypass that inrush current limiter is not functioning, better check the relay contact and the functioning of the relay, it is very common failure in Toshiba TVs.

[dskall]

Re: Toshiba bad resistor

You can pull the cover off the relay and confirm if it is working. If it is functioning then clean contacts. Will need pictures of power board when you ask which relay it is.

[BestYohman]

Re: Toshiba bad resistor

Someone else worked on this board... Horrible soldering and almost every point needed cleaned. Relay tested good and there is no fluctuating power at all. Idk if the horrible job that was done could have caused it but there was tons of corrosion from what looks like the rosin being left on. TV is on and working just don't know if it's safe to go up to the higher ohms.

[budm]

Re: Toshiba bad resistor

When you said the relay tested good, what is the contact resistance? The higher resistor's resistance the less inrush current but the AC Voltage applied to circuit will be less due to more Vdrops on the resistor so the circuit may not start up properly.
What you have to test when the correct resistor is installed is to test and see if there is Vdrops on the resistor or not, it should not be if the relay is OK. You can use 3 Ohms for experiment to verify the relay condition for now.

[BestYohman]

Re: Toshiba bad resistor

OK so it is not a permanent replacement and I'll have to order the correct one?

[budm]

Re: Toshiba bad resistor

Right now the important part is to verify that the relay is good for sure otherwise you will just burn up the new resistor, does that make sense?

[BestYohman]

Re: Toshiba bad resistor

yes i will check the relay now.

[BestYohman]

Re: Toshiba bad resistor

one is 100.2 ohms the other is 269 ohms

[BestYohman]

Re: Toshiba bad resistor

coil side...

[BestYohman]

Re: Toshiba bad resistor

So do the relays need replaced?

[dskall]

Re: Toshiba bad resistor

Post #6 did you test like last sentence. Install resistor turn tv on and check across resistor for voltage

[BestYohman]

Re: Toshiba bad resistor

just reading pins volts 84mv

[BestYohman]

Re: Toshiba bad resistor

tested it multiple times just to make sure of the reading... tv does turn on and picture shows with resistor in.

[budm]

Re: Toshiba bad resistor

So as long as the Vdrops on that resistor is staying low like that then the relay's contacts are good for now.

[BestYohman]

Re: Toshiba bad resistor

ok then the only thing now is ordering the proper resistor... correct?

[budm]

Re: Toshiba bad resistor

I would if you are going to sell the TV, but for your own use you can keep that sub resistor in place.

[BestYohman]

Re: Toshiba bad resistor

OK thank you for all your help!

[dskall]

Re: Toshiba bad resistor

BTW I believe that resistor is a thermal resistor with a 150c thermal fuse built in. If that makes a difference