polaroid tv capacitor identification

[therube]

Re: polaroid tv capacitor identification

I don't usually these frequent forums but figured I would give an update. My Polaroid TV is still working fine six months after I replaced those 2 caps.

[LUCKY19]

Re: polaroid tv capacitor identification

Yeay I fix my tv, polaroid TDA-03211C (powerboard ipos 150 rev 1.8 Proview) -Had audio but no pic and a red Led light blinking it the back.
For reference of how I fixed it I replaced
2 10uf 450v Capacitors (EC17, EC18)
2 FQPF9N50CF Transistors (Q16,Q17)
and a 3.15 amp fuse (F2)
(thank you Dansford, PlainBill, and retiredcaps)

[PlainBill]

Re: polaroid tv capacitor identification

I know what you mean, but ive actually "done that" for a purpose. looking for DC leakage/shorts. and i HAVE seen it.

had a MIDI keyboard and its on-board amplifier one of the channels was putting out DC. replaced the IC and same deal. come to find out, a .01uf, or a ceramic cap marked "102" was actually reading about 800ohms in resistance, same out of circuit as well. umm bad. LOL.

Anyway, move on....

Agreed, there are times when caps go bad. In this case the 'tech' assumed because he couldn't read a resistance the cap was bad.

PlainBill

[mbates14]

Re: polaroid tv capacitor identification

I've seen trained technicians try to use a DMM to measure the resistance of a .01uF cap!!!

I know what you mean, but ive actually "done that" for a purpose. looking for DC leakage/shorts. and i HAVE seen it.

had a MIDI keyboard and its on-board amplifier one of the channels was putting out DC. replaced the IC and same deal. come to find out, a .01uf, or a ceramic cap marked "102" was actually reading about 800ohms in resistance, same out of circuit as well. umm bad. LOL.

Anyway, move on....

[PlainBill]

Re: polaroid tv capacitor identification

It looks like Digikey F3298-ND would be a good replacement; this is a time delay fuse.

PlainBill

[LUCKY19]

Re: polaroid tv capacitor identification

Srry I have only a regular measuring tape, it measures 7/16

[LUCKY19]

Re: polaroid tv capacitor identification

This is the best I can do with out the pic getting out of focus.

[retiredcaps]

Re: polaroid tv capacitor identification

I looked it up on digikey by typing 3.15a 250v and get alot to choose from. I think its these S505-3.15-R. I hate to ask but any links to the correct ones??

A clear focused picture (using manage attachments and not posted inline) of the old fuse would help. Also, measure the dimensions of the fuse.

[LUCKY19]

Re: polaroid tv capacitor identification

Ok back from work. I received my 2 caps today waiting on some transistors, and now looking for this fuse. I looked it up on digikey by typing 3.15a 250v and get alot to choose from. I think its these S505-3.15-R. I hate to ask but any links to the correct ones??

[retiredcaps]

Re: polaroid tv capacitor identification

The fuse I've been checking for resistance, meter show to stay at 1 which i assume it indicates its bad.

If the "1" is on the left hand side of your multimeter, the fuse is open (bad). "1" on the left hand side indicates out of range or infinite.

A good fuse should read less than 1.0 ohms.

1.0 ohms (a measurement) will show up the right hand side of the meter.

[LUCKY19]

Re: polaroid tv capacitor identification

yea d10 looks like its good (.433 in one direction 1 in the other)
I have ordered the caps @ EC17, EC18 already seeing as how every were I went they mentioned about them.
The fuse I've been checking for resistance, meter show to stay at 1 which i assume it indicates its bad.

[PlainBill]

Re: polaroid tv capacitor identification

And one of the little ironies of electronics labeling, a diode with leads is usually referred to as 'leaded' or 'through hole', while a fuse with leads is 'pig tail'.

As far as D10, do the checks retiredcaps suggested. If it is bad, the ECG part is available online.

PlainBill

[retiredcaps]

Re: polaroid tv capacitor identification

D10 is the diode I have no idea how to check it, and yes im at total noob at this.

To test a diode in circuit,

a) put your multimeter in diode test mode
b) put your black lead on one side and the red lead on the other - record reading
c) reverse the leads - recording reading

A good diode should read 0.4V to 0.7V in one direction and 0L or "1" in the other. If you get a reading in both directions, you will have to desolder one leg and retest to verify.

[LUCKY19]

Re: polaroid tv capacitor identification

D10 is the diode I have no idea how to check it, and yes im at total noob at this. Im usually under a car, but im a do it yourself-er and like to learn new things, it why ive tooken up the challenge of fixing this POS tv. ECG576's suggestion to replace d10 diode is totally different. From what I can read off it is J718 R303 round with pig tail on each end.

[PlainBill]

Re: polaroid tv capacitor identification

Sorry, meant I checked it and get nothing on the multimeter.

Here's the problem I'm facing. I know virtually nothing about you. I don't care if you are young, old, tall, short, male, female, white, black, green, yellow, or red. None of those matter (OK, green would be sort of cool).

I also don't know how much you know about electronics. And that is important. I've seen self proclaimed experts trying to measure resistance with one meter lead in the Amps jack and the other in the positive jack. I've seen self proclaimed newbies with decent oscilloscopes and excellent knowledge of how to use them. I've seen trained technicians try to use a DMM to measure the resistance of a .01uF cap!!!

When you say "I checked it and get nothing on the multimeter." I don't know if you measured it's resistance and got .3 ohms, measured the voltage across it with the power on and got .01 volts, or did something unimaginable. I could hope you checked it's resistance and found it acceptable, but at this point I would rather hear something like "fuse's resistance was .2 ohms", or even "I know how to check a fuse, it's good. "

If you wonder why I care, recently we had a thread that ran to over 150 posts. The power supply in a monitor wouldn't start. Probably a dozen people got involved, most with excellent suggestions, some with crazy ideas. All caps were replaced, the SMPS controller was replaced, all diodes were removed and replaced, I believe even the power FET was replaced. The actual problem? A shorted transistor in the inverter. I would rather avoid this thread running to 5 pages only to hear "I thought a good fuse would read open."

NOW, earlier you had mentioned D10. Have you checked that? Remember, fuses usually blow for a reason.

PlainBill

[LUCKY19]

Re: polaroid tv capacitor identification

Sorry, meant I checked it and get nothing on the multimeter.

[PlainBill]

Re: polaroid tv capacitor identification

Yea your right then its an never ending circle.

So my research came up with this quote, "check the diode at D10. This power supply often has a bad diode which can contribute to problems. If so , an EGC 576 might be a good replacement."
Were can I find this ECG 576 diode to buy???

Also a fuse at F2 which I have checked and getting no response. Description on it after removing some green shrink wrapping it shows F3.15A 250v ceramic fuse with pig tails.
Can I find this at any radioshack and is it a slow or fast burning fuse??(this one looks like it might solve my problem)

This person has the same symptom as my tv.

It's ECG576, not ECG 576. Google is your friend. It's a 400V 5A ultra fast recovery (35nsec) diode. If it's a surface mount diode a Diodes, Inc PDU540 is an exact match. It's available from Digikey.

Define 'no response' for the fuse. If it's open, that fuse is also available from Digikey.

I always point out that help is a GIGO (Garbage In, Garbage Out) proposition. The better the information you give us, the better the help we can give you.

PlainBill

[LUCKY19]

Re: polaroid tv capacitor identification

but if you buy a new board, it comes with shitty caps......

Yea your right then its an never ending circle.

So my research came up with this quote, "check the diode at D10. This power supply often has a bad diode which can contribute to problems. If so , an EGC 576 might be a good replacement."
Were can I find this ECG 576 diode to buy???

Also a fuse at F2 which I have checked and getting no response. Description on it after removing some green shrink wrapping it shows F3.15A 250v ceramic fuse with pig tails.
Can I find this at any radioshack and is it a slow or fast burning fuse??(this one looks like it might solve my problem)

This person has the same symptom as my tv.

[rubicondsrv]

Re: polaroid tv capacitor identification

but if you buy a new board, it comes with shitty caps......

[LUCKY19]

Re: polaroid tv capacitor identification

Hmmm... from this u-tube vid they seem to be next to the caps that go bad.
http://www.youtube.com/watch?v=EDylk9ezQtA
Seems like if i buy a whole new power board less of a headache.