Can resistor used as a soldering iron?

[capwizard]

Can resistor used as a soldering iron? Basically, they are same structure?

PS: Isn't Melania Trump looking like Jackie Kennedy?

[capwizard]

Re: Can resistor used as a soldering iron?

The heated resistors are caused by shorted one buffer board driver IC 3407F.


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[capwizard]

Re: Can resistor used as a soldering iron?

I am A slappy guy but not for this one.

pic: It works with my homemade FLUX, homemade ComPaq hot air rework station.

Homemade soldering paste, flux & Chip Quik
https://www.badcaps.net/forum/showthread.php?t=58792

[capwizard]

Re: Can resistor used as a soldering iron?

Wirewound resistors, R5600 and R5610 are 10 ohm resistors, paralleled together became a 5 ohm resistor which has 13.8A current (952w) passes through about 20 seconds (19k Joules) becomes red hot.

[budm]

Re: Can resistor used as a soldering iron?

That circuit section can supply 70V at 13.8A for that long without blowing the fuse? That is more power than the whole TV consumes.

[capwizard]

Re: Can resistor used as a soldering iron?

That's a very good question! TV came with no Fuses blown out, with shorted buffer ICs and red hot resistors, Unknowing customer maybe let the TV on for hours?

[budm]

Re: Can resistor used as a soldering iron?

An you are able to read 70V across the resistors? Some thing is not logical. 13.8A through small traces would have cause lots more damage than that.

[capwizard]

Re: Can resistor used as a soldering iron?

Tv has been fixed, I measure from ground to not red hot-working resistors voltage readout is 69v DC?

[budm]

Re: Can resistor used as a soldering iron?

Tv has been fixed, I measure from ground to not red hot-working resistors voltage readout is 69v DC?

That is why it did not make sense because you are not measuring the actual Vrops on the resistor. When numbers do not added up then you know it is an error in measurement, especial when you see 13.8A.
Details and common sense and math come into play.

[capwizard]

Re: Can resistor used as a soldering iron?

I did remember when I measured voltage across with red hot resistors is 0.2 V, almost no voltage there? I probably need to measure with current?

[budm]

Re: Can resistor used as a soldering iron?

I did remember when I measured voltage across with red hot resistors is 0.2 V, almost no voltage there? I probably need to measure with current?

Nope, so 0.2V on 5 Ohms resistor, what do you think the power dissipation will be?

[capwizard]

Re: Can resistor used as a soldering iron?

0.04A 0.008w.....? I Need to put back original Y-sustain board and measure again.....

PS: For working TV voltage across resistors it is 0.2 V. voltage from resistors to GND is -68.1v.

[budm]

Re: Can resistor used as a soldering iron?

Yep, when something does not make sense, measurement must be made again.

[capwizard]

Re: Can resistor used as a soldering iron?

Sorry, I can't re-established the crime scene, anymore! I try to shorted the pin as the original buffer board did (this is other junk buffer board), the red hot resistors no more worked .....And this is the customer's TV, I need to stop some where .........see you guy next time, I will measure the Vrops on the red-hot resistors first.......

[capwizard]

Re: Can resistor used as a soldering iron?

You know, I gonna have an insomnia. So I double checked, I found power cable to Y sustain board is unplugged...................Thanks budm again..........

pic5: the resistors light up.

[budm]

Re: Can resistor used as a soldering iron?

Since they are two 10 Ohms resistors connected in parallel, so each one dissipates about 7.5W.

[capwizard]

Re: Can resistor used as a soldering iron?

The 10 ohm resistor is 2w rating for 7.5w ! What's why!

[budm]

Re: Can resistor used as a soldering iron?

They should have use FUSIBLE resistor instead or better circuit protection design to stop too much current flow when fault occur. But at least they use Fame proof resistors.

[capwizard]

Re: Can resistor used as a soldering iron?

Can we re-use those have been red hot resistors again?

[capwizard]

Re: Can resistor used as a soldering iron?

For Dear Capwizard: "Can we re-use those have been red hot resistors again?"

I put it back and gave TV to customer, He gonna test for us. .......If I do not update in one year, It means TV works ....