polaroid tv capacitor identification

[elbtax]

Re: polaroid tv capacitor identification

Beer will be here around six est. Lickily for me there is a case in the fridge already!!!

[PlainBill]

Re: polaroid tv capacitor identification

Rube,
Glad your fix went well as did mine. Simple fix for a friend that earned me a case of [U][B]BEER. Pic attached...

Who cares about the TV? Where's the beer?

PlainBill

[elbtax]

Re: polaroid tv capacitor identification

Rube,
Glad your fix went well as did mine. Simple fix for a friend that earned me a case of [U][B]BEER. Pic attached...

[PlainBill]

Re: polaroid tv capacitor identification

I replaced those 2 caps today, took like 5 minutes....TV works fine again. no strange noises or anything either!
Next thing is im going to rig up a spare computer fan in the back of the TV and have it blow air across the heat sinks.
Thanks again to everyone who helped.
Rube

Suggestion: Let the TV operate for half an hour or more without forced cooling (leave the back off if you want to), then check the temperature of those caps (carefully!!). If they feel hot, they probably won't last a year.

PlainBill

[therube]

Re: polaroid tv capacitor identification

I replaced those 2 caps today, took like 5 minutes....TV works fine again. no strange noises or anything either!
Next thing is im going to rig up a spare computer fan in the back of the TV and have it blow air across the heat sinks.
Thanks again to everyone who helped.
Rube

[el3ctroded]

Re: polaroid tv capacitor identification

Adding a fan will help... It will sustain the transistors and the caps. Since the heatsinks are too small, it's a good idea to use one! The forced air will allow the too-small heatsinks to dissipate more heat.

Another thing to do is to use an infared thermometer to test the temperature around the caps with the screen running for a while. Let us know of any hot spots.

Did you ever hear a static-like noise from the PSU? Have someone with good ears (if yours aren't) listen for you after replacing the caps because that could indicate failing PWM controller or FETs.

Also listen for another similar noise which could indicate a short in the high-voltage output. My Poloroid issues started with a short on the high-voltage wire where it attaches to the board that connects to all the CCFLs.

Aside: My wife can hear the high frequency noise from each separate SMPS on the PSU from a few feet away, which really helps troubleshooting!

[elbtax]

Re: polaroid tv capacitor identification

Scenic,
When i first saw the cap i thought it was bulging. Looked at pictures on other post and the main filter cap looks the same.
My two caps that are bad are the same as Reid52 with the exception of the cap reading ZP195[B]CV15. I ordered the Panasonics also. Let ya'll know the outcome tomorrow.

[Scenic]

Re: polaroid tv capacitor identification

is it just me or does the primary filter cap in the 2nd pic of post #4 look like it's about to blow out the top?

could be the photo, but i doubt it with that much of a dent outwards.
may also explain why the other caps failed.. (?)

[PCBONEZ]

Re: polaroid tv capacitor identification

It seems to be at 120Hz vs 100kHz

[retiredcaps]

Re: polaroid tv capacitor identification

Oops. Never mind fat fingered the wrong button.

[PCBONEZ]

Re: polaroid tv capacitor identification

The originals::

SONJIU ELECTRONIC ENTERPRISE CO., LTD.

KM Series

http://www.sonjiu.com.tw/style/conte...0095&id=223991

The ripple shown is is 87 on those.

[elbtax]

Re: polaroid tv capacitor identification

Rube,
I ordered the panasonics. Here are pics of the solder side. Notice the grey looking solder joints. (Pic3) I haven't reflowed yet, Probably today cause parts should be in on the morrow.

[PlainBill]

Re: polaroid tv capacitor identification

There were a couple of points I was looking at. The Nichicon are good quality caps, but appear to be designed for use in a 'conventional' SMPS. More emphasis was made on the ripple at 120 Hz than at higher frequencies. They DID spec the ripple current at 100Khz at 75 ma.

The datasheet for the Panasonic parts was the new style, which I dislike, but it specifically mentioned a ripple current rating of 490Ma at 100Khz. This would be the capacitor of choice for the output of a PFC 'front end'. Provided this power supply does have one.

The other (minor) difference was the Panasonics are rated for 10000 hours at 105°C, the Nichicon at 'only' 8000.

Bottom line, EITHER of these caps are worlds better than the ones therube found in his TV.

I have been unable to identify the characteristics of the caps reid52 found in his TV. HEC appears to be an old line American company making water cooled ceramic caps for radio transmitters. I doubt any of their products would be found in a TV made in China (or Korea, or Japan, or the USA).

PlainBill

[reid52]

Re: polaroid tv capacitor identification

sounds like the panasonic caps are closer to the stock size caps. I'll try out the ones I ordered by Nichicon since they already shipped.

I just placed an order for the Panasonic ones, once I replace them I'll get back on how well they worked.

[therube]

Re: polaroid tv capacitor identification

They are about 7/8" by 1/2".

sounds like the panasonic caps are closer to the stock size caps. I'll try out the ones I ordered by Nichicon since they already shipped.

[reid52]

Re: polaroid tv capacitor identification

They are about 7/8" by 1/2".

[therube]

Re: polaroid tv capacitor identification

I ordered these made by Nichicon:

http://search.digikey.com/scripts/Dk...me=493-2069-ND

PlainBill suggested these made by Panasonic:

http://search.digikey.com/scripts/Dk...2W100&x=31&y=8

maybe he can chime in on which is better. I had already ordered the ones manufactured by Nichicon before I read his suggestion. The ones I ordered are rated at 8000hrs at 105*C, the ones PlainBill mentioned are rated at 10000hrs at 105*C. Another difference I see is their physical size.
The Nichicon caps are 0.630" Dia x 0.984" H (16.00mm x 25.00mm)
The panasonic caps are 0.492" Dia x 0.787" H (12.50mm x 20.00mm)
Can you measure your stock caps and post up the size?

[reid52]

Re: polaroid tv capacitor identification

I have the same TV with the same problem, but my caps are originals. HEC brand, 10μF 450V. Printed on the other side is ZP105°CU42. What caps will be good to replace these?

[therube]

Re: polaroid tv capacitor identification

Voltage and capacitance are only two of the parameters that are important here. The surge current and ESR should also be taken into consideration. Failure to do so can result in a premature failure. Given the number of failures reported, going with 'pretty good' probably won't be good enough.

PlainBill

how would I find out about the surge current and ESR? what exactly do they mean?

Thanks
Rube

[PlainBill]

Re: polaroid tv capacitor identification

maybe im crazy, but I can make out 10uf 450V on those caps lol.but in any case elbtax pm'ed me with the specs. they are rated at 10uf 450V

Voltage and capacitance are only two of the parameters that are important here. The surge current and ESR should also be taken into consideration. Failure to do so can result in a premature failure. Given the number of failures reported, going with 'pretty good' probably won't be good enough.

PlainBill