Electrical heater controler

[tomalamix]

Re: Electrical heater controler

Sometimes supplies like these use a capacitive dropper: then the value of the yellow X class capacitors is very important (that it has not degraded in capacitance value).
I'm not sure if this is such a device, I do see a small transformer so maybe not, but won't hurt to chuck (as long as it is discharged lol)

Ok, Im going to remove both just now and will write the result right away:

Ok, both rated for 275V, one is 0.47uF, while testing gives me 259.7nF with 3.8ohm ESR. Almost half the capacitance it should have.

The other is a 0.15uF and reports 1005pF, no ESR value (strange...). The reading is wayyyy too low. Should i do some other testing to be sure? I've disconnected only one leg of the capacitors, discharged both and done the testing.

[Per Hansson]

Re: Electrical heater controler

Sometimes supplies like these use a capacitive dropper: then the value of the yellow X class capacitors is very important (that it has not degraded in capacitance value).
I'm not sure if this is such a device, I do see a small transformer so maybe not, but won't hurt to chuck (as long as it is discharged lol)

[tomalamix]

Re: Electrical heater controler

Sorry, i thought i did uploaded those correctly. I have the controller disassembled, if you need some closer picture to some area please tell me.

Meanwhile I'm going to try changing that capacitor 4.7uF 50V that is reading 4900nF, 10ohm for ESR and Vloss 4.5%. Unfortunately will be a JACKCON again, my local eletronics store doesnt have another brand. Later and if the problem is solved I'll go for Panasonic or Rubycon.

If you guys see anything else worth to test please tell me, I'm getting used to test my new ESR02 Pro

[Per Hansson]

Re: Electrical heater controler

^^I uploaded the originals to the OP.

[R_J]

Re: Electrical heater controler

180 x 83 pixels is too small to be usefull

[CapLeaker]

Re: Electrical heater controler

Can we see some high res pictures?

[sam_sam_sam]

Re: Electrical heater controler

Then the most likely issue is that capacitor that you checked by the switching power supply transformer because if you look closely at where this capacitor is it should be very close to an ic chip that is some type switching power regulator or a off line switching device

One thing you can try is disconnect the back light and see if does the same exact thing if dose then you have a switching power supply issue if does work correctly with out the back light then you could have an issue with the back light or still have a switching power supply issue

[tomalamix]

Re: Electrical heater controler

Hy sam_sam_sam!

Thank you for your input.

I dont have a power supply to put 5V inside the controller rail and at this moment, but i can explore that

About the heating element, its clearly a relay, it's covered with that hot glue that you can see in the picture, but that one is working properly, it turns off the heating element when the temperature reaches the desired temperature and turns on when the temperature is dropping too much.

The appliance works 100% IF i dont touch the buttons that makes the back lit come on, if i do that it seems the power is all drained out to the back lit and can't hold the back lit on nor the display - it remains like that for 10-15 seconds (its the time that the back lit should stay on)

thank you

[sam_sam_sam]

Re: Electrical heater controler

Hy guys!

Today Im posting a few photos from my electrical heater controller.

The thing is that it turn on just right but as soon as the backlit comes in when I press the UP / DOWN temperature buttons the displays fades at such a point that the display fades completely progressively in 1-2 secons, its noticeable the display fading away, then the backlit stays really weak and the power LED goes out.

Everything comes back to normal after a 10 seconds that is the time the backlit should remain ON while i change the temperature setting.

Besides this, as long as I don't touch the temperature setting it works, I can see the temperature in the display (because the backlit is not turned ON).

Below I attach a picture of the PCB from where you can see several capacitors, all JACKCON









I've took one out, the 4.7uF 100V that is near the small yellow transformer (that feeds the backlit among other things) and it reads 4900nF , 10ohm for ESR and Vloss 4.5%.

The value seems OK but im not sure about the ESR and the Vloss, I'm not a electronics expert but i would like to repair this unit, so i think I can count with your expertise by looking at the PCB photos and giving me some inputs, all are valid.

I have several other electrical heaters becoming like this one: when the backlit kicks in the displays fades completely.

I would say that if 4.7uf at 50 volts has a value of 10 that is way to high now if it at 100 volts or more this value might be still a little bit high the best thing is if these capacitors are not brand name capacitors replace them for good measure ( I would highly recommend that you replace this capacitor first and see if you still have this issue )

**** Use caution doing this *****

Here is something you might try if you can find the power supply rails for the heater controller portion ( this will probably be a voltage around 5 volts or so it might be a little bit higher than this ) of the circuit and can power it up from there and just operate the the controller with out the heater element and see if you have the same exact issue that will help you narrow down what part of the circuit is giving you this issue


****************************

But my guess is that there is an issue with the switching power supply portion of the circuit board and this is why when you put the heater on the power supply rails are draining down completely or nearly that way and this might be because of a bad capacitor on the switching power supply regulator or something is wrong with the controller part that turns on the heater element

I have one question for you and that is this what device turns on the heater element is it a relay or some type of ic device of some type

I hope this helps you figure out what going on with this device

[tomalamix]

Hy guys!

Today Im posting a few photos from my electrical heater controller.

The thing is that it turn on just right but as soon as the backlit comes in when I press the UP / DOWN temperature buttons the displays fades at such a point that the display fades completely progressively in 1-2 secons, its noticeable the display fading away, then the backlit stays really weak and the power LED goes out.

Everything comes back to normal after a 10 seconds that is the time the backlit should remain ON while i change the temperature setting.

Besides this, as long as I don't touch the temperature setting it works, I can see the temperature in the display (because the backlit is not turned ON).

Below I attach a picture of the PCB from where you can see several capacitors, all JACKCON









I've took one out, the 4.7uF 100V that is near the small yellow transformer (that feeds the backlit among other things) and it reads 4900nF , 10ohm for ESR and Vloss 4.5%.

The value seems OK but im not sure about the ESR and the Vloss, I'm not a electronics expert but i would like to repair this unit, so i think I can count with your expertise by looking at the PCB photos and giving me some inputs, all are valid.

I have several other electrical heaters becoming like this one: when the backlit kicks in the displays fades completely.