42" Spectrincq no power

[avaktech]

Re: 42" Spectrincq no power

Bud m, c44 is an electrolytic on its side, small one, 25v 47uf. But I can see why you'd say otherwise, just a bad picture.

[selldoor]

Re: 42" Spectrincq no power

Ok - so its the RED or Reddish one. They dont often fail or else they fail dramatically. and split.
It doesnt even look bulged - have you found/tested the Bridge Rectifier yet?
They often fail and take out the fuse.

[avaktech]

Re: 42" Spectrincq no power

Can you please help me identify the bridge rectifier?

[avaktech]

Re: 42" Spectrincq no power

Maybe this one? It has 4 legs.

[avaktech]

Re: 42" Spectrincq no power

Bridge rectifier, if it is, tests bad, it reads in same in both directions which based on my very limited knowledge indicates its bad. What else would it take out when it went?

[tom66]

Re: 42" Spectrincq no power

Usually that's it, damage is limited to the bridge. They die from heat, age, and voltage spikes.

[selldoor]

Re: 42" Spectrincq no power

Bridge rectifier, if it is, tests bad, it reads in same in both directions which based on my very limited knowledge indicates its bad.

Did you not see post 11? where I asked you to test it told you where it was and how to test it?

[avaktech]

Re: 42" Spectrincq no power

I may not be the sharpest, or most focused, but I am however very grateful! Thanks to all who contributed. I'll let you know how I make out when my kids get to sleep and I can pay attention to what I'm doing.

[avaktech]

Re: 42" Spectrincq no power

Ok so I replaced the bridge, replaced bulging caps, and popped a new fuse in. What did I get? Fireworks! Got some sparkage at the main switch and a glowing red light, at least its more than I had the first go around. When I push the power button it flashes 3 times and nothng. I pulled the board and had another look, noticed R1 burned up not sure what the value was cause I can't read it! Anyone wanna jump in?

[tom66]

Re: 42" Spectrincq no power

Check for 5Vstby, then post a picture of the main board and check the two buck converters on it.

[selldoor]

Re: 42" Spectrincq no power

You might want to try and rig a light bulb in place of the fuse for further tests.
http://antiqueradio.org/dimbulb.htm

Has R1 totalled or can you clean it at all with isopropyl alcohol
-sometimes the color rings are still on the bottom side?

Can you post a pic showing where it was on the board?

[avaktech]

Re: 42" Spectrincq no power

R1 is a surface mount on the baskside. I'll mess about with it when I get some coffee in me.

[selldoor]

Re: 42" Spectrincq no power

If its smd that will be more difficult unless it was labeled on both sides
I have this, the source is reliable but will depend on whether I asked the
correct question so If we can get a second opinion from somewhere.

Charles Hyde & Son
Hi. If you need any assistance, please feel free to ask me a question.
ME
Any chance you could advise the vaule of R1 in the KT14 kit for the AD301M24-4N1
Charles Hyde & Son
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[avaktech]

Re: 42" Spectrincq no power

Selldoor, you are a rockstar! I included a pic of the location of r1. What would cause it to go?

[selldoor]

Re: 42" Spectrincq no power

Didnt really need the second opinion - this is one of the reasons we ask for
good clear pictures.

Will have to wait for Budm or some circuit wizard to make a guess as to why it might have blown.

[vinceroger69]

Re: 42" Spectrincq no power

also double check the new capacitors are fitted the right way round mistakes can happen.

[avaktech]

Re: 42" Spectrincq no power

Caps are in the right way, I did not replace all of them, just the noticeably bad ones. Here's some more damage I just noticed, one of the 2 resistors I asked about originally popped. I can't tell if they are resistors or fusibles since they tested like fusibles.

[avaktech]

Re: 42" Spectrincq no power

I hope you guys haven't jumped ship on me! I also found this diode to be bad. Is this likely a symptom or a cause? Also can someone please tell me what these resistors are? Thanks

[budm]

Re: 42" Spectrincq no power

What is the P/N of that IC by the bad resistor as shown in post34?

[avaktech]

Re: 42" Spectrincq no power

tny266pn, any easy tests for it? It had a tiny heatsink that popped off.