polaroid tv capacitor identification

[Shinju]

Re: polaroid tv capacitor identification

After all I did to fix the new power supply I got, it's not working again. It turns on and the back lights come on for the Polaroid logo then they shut off. There is audio and a picture but no lights!

[Dgtech]

Re: polaroid tv capacitor identification

Yes - D10 is a common failure on these boards. Look here at my post on a similar board used in a Memorex 32 LCD. Same problems.

https://www.badcaps.net/forum/showth...ght=TDA-03211C

[Shinju]

Re: polaroid tv capacitor identification

I was diode checking the "bad" supply that was originally with the set and D10 appears to be toast. So with that said when I got this unit the power LED wouldn't even come on when plugged in so would D10 cause this?

I checked all the other smaller Diodes on the board they are readingD23/24 183 and D7/6 505 D5 445 all of these are in circuit.

[Alastair E]

Re: polaroid tv capacitor identification

Wow, what a POS!

Polaroid TDX-02611C

I am going to avoid these Poloriod panels going forward. Low quality and very fickle parts!

After tracking down the the original power supply was toast, and getting another one that worked for all of 5 minutes before it stopped working (sound but no backlight) replaced the Q16-17 n-channel fets and the 450v 10uf caps it worked for all 20 min before it did the same problem as before. I then noticed the small chip in IC7 socket was not seated right and it had 2 missing legs ( error controller ic?) anyway so I took the one out of the old power supply and plugged it in (two totally different style chips) and low and behold it's working. It's going on 35 minutes with no issues so far.


Ugh lol what a mess! I will give these sets credit they are easy to take apart.

Nah--No better and no worse than the majority of the LCD sets out there. We have exactly the same make sets here, but marked either Bush, Polaroid, Hisense etc--Whatever name they fancied sticking on the sets that day!....

Simple and straightforward generally, although that PSU is unusual with its high supply to the inverter.

A positive Bonus, Only 3 or 4 screws to get at practically everything--Instead of 40!!

[Shinju]

Re: polaroid tv capacitor identification

I am going to recycle this thread as I don't see a point to open a new one.


Ok so this Panel was working great, I watched two full movies on it and had it running down all night down stairs with a pixel flipper on trying to fix a lazy pixel. After running for 10 hours straight I turned it off this morning to let it rest.

I went down to turn it on again and now its doing the same issue as before, turns on, screen lights up with the Polaroid logo and then turns the backlights off. You can still see the screen going and the sound working so I am not sure what to do next.

I am determined to fix this as I don't mind loosing a little money to learn and trouble shoot.

Could this be the transformers for the back lights? I don't have a coil tester so I have no idea how to check those with out one. The power supply was out of a 32" these Polaroid sets (I think they are LG made) share the same power supply from the 26" to the 42" just have several variations of them.

Grrr I thought I was about to wash my hands of this beast!

[Shinju]

Re: polaroid tv capacitor identification

Wow, what a POS!

Polaroid TDX-02611C

I am going to avoid these Poloriod panels going forward. Low quality and very fickle parts!

After tracking down the the original power supply was toast, and getting another one that worked for all of 5 minutes before it stopped working (sound but no backlight) replaced the Q16-17 n-channel fets and the 450v 10uf caps it worked for all 20 min before it did the same problem as before. I then noticed the small chip in IC7 socket was not seated right and it had 2 missing legs ( error controller ic?) anyway so I took the one out of the old power supply and plugged it in (two totally different style chips) and low and behold it's working. It's going on 35 minutes with no issues so far.


Ugh lol what a mess! I will give these sets credit they are easy to take apart.

[ChipStewart]

Re: polaroid tv capacitor identification

Found a TDA-03211c at the county landfill. Plugged it in, and nothing - which I took as a good sign. Replaced the two caps and it lit right up. Only problem is . . . the LCD has been damaged and all I get is the pretty lines and designs.

Guess that shows the downside of fixing TV's of unknown origins. Looks like it's time to part it out on eBay.

[polyfractal]

Re: polaroid tv capacitor identification

As it turns out, I think the D10 Diode is dead (gives a "004" continuity/diode reading in both directions, even with one leg detached from the circuit). Ordered a replacement from Newark (MFN: NTE576) as well as some replacement caps.

I'll report back in a few days with how/if it worked

Well, I replaced the diode and two caps - TV works like new.

[polyfractal]

Re: polaroid tv capacitor identification

As it turns out, I think the D10 Diode is dead (gives a "004" continuity/diode reading in both directions, even with one leg detached from the circuit). Ordered a replacement from Newark (MFN: NTE576) as well as some replacement caps.

I'll report back in a few days with how/if it worked

[polyfractal]

Re: polaroid tv capacitor identification

Hi everyone. I grabbed a Polaroid TDX-03211c off the street a few days ago. Predictably, it doesn't power on. After reading this thread and similar ones around the internet, I opened it up and examined the capacitors on the power supply.

None are obviously bulging or leaking and all the fuses are still good. I removed the two caps that normally fail (10uF 450v, next to the transformer coils) and tested them with a capacitance meter. One tested at 9.98 uF while the other was 8.9 uF.

I think electrolytic caps can have a wide degree of capacitance variance, so I'm not sure if the 8.9 uF cap is actually bad. Any way to tell? I only have a digital multimeter and a capacitance meter.

Any other suggestions? Here are some pics of my board (with caps and two fuses removed). Click for bigger pics:

[Wcranford]

Re: polaroid tv capacitor identification

Thanks so much for your help. I replaced the caps and it works great!

[PlainBill]

Re: polaroid tv capacitor identification

Which of those is the best? I ordered the Nichicon but will order the Panasonic if it is better. Sorry for all the posts. I have read through this entire tread trying to understand the ins and outs of bad caps. And I finally learned how to edit a post and add pictures! LOL Us blonds do take time to train. Anyway. Thanks PlainBill and everyone else for all your help.

It's a little like asking "Who makes a better truck - Ford or Dodge?" Each will handle the jobs they are designed for and last a long time with proper care. Problems will occur if the task (towing a heavy 'fifth wheel' trailer) requires a Ford F450 series truck or equivalent and the buyer instead purchases a Ford F150 (little more than an open bed station wagon).

Nichicon, Panasonic, and United Chemicon all make excellent capacitors, and several series suitable for use as output filters in Switch Mode Power Supplies. They also make many other series that are not intended for that application.

The caps you purchased are being used in the input filter, and are suitable for that task.

PlainBill

[Wcranford]

Re: polaroid tv capacitor identification

Which of those is the best? I ordered the Nichicon but will order the Panasonic if it is better. Sorry for all the posts. I have read through this entire tread trying to understand the ins and outs of bad caps. And I finally learned how to edit a post and add pictures! LOL Us blonds do take time to train. Anyway. Thanks PlainBill and everyone else for all your help.

[PlainBill]

Re: polaroid tv capacitor identification

The Panasonic is high temp series EB. The nichicon is series PW, low impedance.

OK, I understand. Forgive my confusion.

PlainBill

[Wcranford]

Re: polaroid tv capacitor identification

The Panasonic is high temp series EB. The nichicon is series PW, low impedance.

[PlainBill]

Re: polaroid tv capacitor identification

The height should not be a problem.

I am concerned that you are only discussing the brand. Both the brand and series are important. Digi-Key carries 9 different series of Panasonic caps, Only three of them are suitable for use in an SMPS.

PlainBill

[Wcranford]

Re: polaroid tv capacitor identification

The 150uf is Panasonic and the 10uf is Nichicon. Are they good quality name brand? I can get them to fit. The 150uf should be fine after I extend the leads as you suggested. The 10uf will fit but is it a good idea for it to be so tall? Here is a pic of how it would look once installed. I just sat it in there to see. I am also attaching a doc of caps compared on Mouser's site. One is the one I received and the other is Panasonic. I would rather order the better ones for the job if the ones I have are not a good idea. Any suggestions?

[PlainBill]

Re: polaroid tv capacitor identification

The critical parameters for replacement is to use a good quality (name brand) low ESR cap with the same capacity and voltage that will fit in the available space. As long as it will fit, it's fine to use it.

As far as the cap whose leads are too short, cut the leads of the old cap as close to the case as possible. Wrap the ends of the original leads around the leads of the new cap and solder.

PlainBill

[Wcranford]

Re: polaroid tv capacitor identification

More photos of the caps

[Wcranford]

Re: polaroid tv capacitor identification

Here is a picture of the original caps along with the replacements. I think they are the wrong ones for my TV. I am looking for the parts for the TDA-03211C. The large one on the right is the old one. and the small brown one on the right is the old one.