Toshiba 42rv530u wont power on

[nomoresonys]

Re: Toshiba 42rv530u wont power on

You can take the suspected filter capacitor out of circuit and test it, I think you said your meter can test capacitance correct?

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

Did you test the bridge rectifier and voltage regulator?

Yes I believe so C825 and D820? They run at 598 ohms.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

Ok, so whats the status of the filter cap, bulged or flat?

Which one is that? The big 450 uf? AC it goes 553 and then 1312 ohms then it won't read at all. Dc = 713 ohms and then 1256 ohms and shuts off... I think I'm doing something wrong. I'm on the capacitance setting with the arrow and line, and red is on + black on negative.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

You can take the suspected filter capacitor out of circuit and test it, I think you said your meter can test capacitance correct?

Yes, the arrow that points to the line? Which one is the filter capacitor?

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

So now the resistor R850 is NOT open? If it measure 0Ω then your fault is somwhere else
with power OFF, check the rsistance of the fuses F820 & F840.
If you feel comfortable working on this with power applied...
Measure the DC voltage accross C820 (220uf/450v) If there IS voltage is it 160v or closer to 400v?
Keeping your negative probe on the (-) of C820, check the voltage on both sides of the fuses, F820 & F840. IS there voltage on both sides of these fuses

Ugh, I just realized that my Simpson meter says 1 and nothing else when testing the resistor at R850. It gives me no reading. However, on my harbor freight multimeter it says 0. Not just 1.

[R_J]

Re: Toshiba 42rv530u wont power on

I will try one more time. R850 should check just like a piece of wire, zero, short, not open.
If it measures 0 or 1 or 2 ohms it is good!

with the board in the tv do you here the relay click when you plug the tv in?

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

I will try one more time. R850 should check just like a piece of wire, zero, short, not open.
If it measures 0 or 1 or 2 ohms it is good!

with the board in the tv do you here the relay click when you plug the tv in?

Ok, zero it is then. No I do not. I thought it might but it never has.

[budm]

Re: Toshiba 42rv530u wont power on

Which one is that? The big 450 uf? AC it goes 553 and then 1312 ohms then it won't read at all. Dc = 713 ohms and then 1256 ohms and shuts off... I think I'm doing something wrong. I'm on the capacitance setting with the arrow and line, and red is on + black on negative.

"Dc = 713 ohms and then 1256 ohms and shuts off... I think I'm doing something wrong."
DC with Ohm reading?
I think you need to read your user manual on how to use the meter.

[R_J]

Re: Toshiba 42rv530u wont power on

I agree with budm. I could have you check some things with power applied but you might hurt yourself or the power supply.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

"Dc = 713 ohms and then 1256 ohms and shuts off... I think I'm doing something wrong."
DC with Ohm reading?
I think you need to read your user manual on how to use the meter.

Yes that manual was very helpful, thanks for sending it learned a few things from it. For continuity, it on (obviously) I have the ohms option pushed in along with the 2K button. AC gives me the tone, but only momentarily on this component I am not sure why. Both of my meters give me inconsistent readings and then nothing back to 1. Should I have it plugged into the gfci? If I am supposed to I feel really dense right now.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

I agree with budm. I could have you check some things with power applied but you might hurt yourself or the power supply.

That's understandable, I'm just trying to figure out what I'm doing wrong with my meters. I'm doing it just like the Tampa Tech guy on YouTube and his board is not powered up.

I am always reluctant to blame my equipment as I can generally account for my mistakes. However, I've read the manual and I'm still coming up short. I've worked on all kinds of equipment in the past from power tools to lawnmowers, washing machines dryers, and cars/trucks. This is just not computing for me. I would never want to try any of y'all's patience and I am really grateful for getting this far. I feel like I'm almost there though. The switch component theory is pretty convincing to me. But I can't get a reading no matter how I position my probes on said component. The component at C820 has me stumped. I am trying to which it off but there's these weird metal petals holding it on under the solder.

My probes read zero when I touch them BTW I'm not sure if I have ever mentioned that.

[nomoresonys]

Re: Toshiba 42rv530u wont power on

Here's a guy discharging a capacitor the 450 volts can KILL EASILY, have to use extreme caution, the DEADLY charge can be there LONG after tv is unplugged. https://www.youtube.com/watch?v=wYUeELNI1cU

[nomoresonys]

Re: Toshiba 42rv530u wont power on

https://www.youtube.com/watch?v=RaY6yzbFdt4 capacitance testing.

[nomoresonys]

Re: Toshiba 42rv530u wont power on

Check those videos you were watching, watch m over and over til they make sense to you.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

Here's a guy discharging a capacitor the 450 volts can KILL EASILY, have to use extreme caution. https://www.youtube.com/watch?v=wYUeELNI1cU

Yes, we used to start Dad's truck like that. He would never let me do it though, and he always said grandma's radio was just as dangerous so I don't play with electricity. I have not had it hooked up in 24hrs. Is that not long enough, for the sake of safety? Probably closer to 36 by now.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

Check those videos you were watching, watch m over and over til they make sense to you.

Yes I've watched her. Maybe I need to buy a Fluke or take a trip to Harbor Freight. I don't have alligator clamps, and my components are all soldered to the board.

[nomoresonys]

Re: Toshiba 42rv530u wont power on

https://www.youtube.com/watch?v=M-AIbrbT6LI
Did you ever decide if it was bulging.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

https://www.youtube.com/watch?v=M-AIbrbT6LI

No sparks.

[Heavyarms92]

Re: Toshiba 42rv530u wont power on

https://www.youtube.com/watch?v=M-AIbrbT6LI
Did you ever decide if it was bulging.

I am leaning on the side of it not bulging. My multimeters keep giving me readings that flash and disappear quickly when I go red to + and black to -. Same if I switch them.I am so confused at this point.

[nomoresonys]

Re: Toshiba 42rv530u wont power on

Looks like your tv was made in 2008, you very well may need some new caps.