Cap Identification

[breast69au]

Re: Cap Identification

No I got all three from xon I think the 39pf was a different manufacturer to the other two thou

[dfulton]

Re: Cap Identification

I have this same problem going on with an iSymphony LC37iF80. It appears to have the same board, which is why I posted here instead of starting a new thread. It looks like I have the 10 and 27 caps burnt and the above post looks to answer where I can get them. However the last cap the 39 doesn't have that designation on it. It has NPO 5D 6KV. Is that the 39 cap shown above? And just to comfirm the other two caps are LY SL6KV 27J and LY SL6KV 10J. I am just looking to make sure I order the right caps. Thanks.

[budm]

Re: Cap Identification

NPO 5D 6KV = 5pF 6000V (COG (same as NPO) type)
LY SL6KV 27J = 27pF 6000V
LY SL6KV 10J = 10pF 6000V

[dfulton]

Re: Cap Identification

Thank you for the quick reply and I'm sorry for still being so new to this. Found it DEC1X3J050DC4BMS1 Thank you again for your time.

[budm]

Re: Cap Identification

"However the last cap the 39 doesn't have that designation " Do you mean by 39? The number as printed on the body or the designator as printed on the board. May be post the pictures?

[dfulton]

Re: Cap Identification

The NPO 5D 6KV you identified it and answered my question. Thanks.

[budm]

Re: Cap Identification

http://www.mouser.com/ProductDetail/...zwOP8HBLawI%3d
It looks like the NPO (COG) type will be hard to find.

[dfulton]

Re: Cap Identification

What about DEC1X3J050DC4BMS1 will that replaced the NPO ? Sorry I'm such a newb.

[budm]

Re: Cap Identification

Sorry, the one I gave you the link on post 27 is COG type (it is on the bottom of the page) so it should be OK, the one you post from MURATA has SL temperature curve spec.
http://www.mouser.com/ProductDetail/...zwOP8HBLawI%3d

[breast69au]

Re: Cap Identification

http://www.x-on.com.au/InventoryDeta...id=1079189&s=1

Thats the one I used.

[tallil]

Re: Cap Identification

I am sorry however this not a replay but a question. Does anyone know where I can go to buy capacitor C43 6KV 39 pF or a motherboard for this Vivo TV IN Brisbane.

[phantom_zero]

Re: Cap Identification

Hi all.. I bought a defective LTV40FHD from a seller. When I opened it, I figured it had the same problem as yours. I saw that there were attemps to repair it and resulted to one of the caps exploding or burnt as there were burn marks on the board. Fortunately no other part is affected. I saw that only the 39pf and 27pf is parallel connected. I couldnt find any 6kv capacitors or 39pf. The 10pf were still fine so i just needed the 39 and 27. In parallel connection, the capacitance is added up, so 39+2=66. I found four 33pf rated at 1kv. I read somewhere that inverters for ccfl backlight has operating voltage of 500 to 1000 vrms. I only hope the inverter operates at below 1000. When i soldered in the capacitors and turned on the tv i was half expecting it to blow. But it didnt. I still have to test it if its gonna last. I think a 66pf 6kv would work better if i can find one.

[budm]

Re: Cap Identification

Start up Voltage can be as high as 2000V or more, running Voltage can be from 900V ~1200V.

[phantom_zero]

Re: Cap Identification

Is that so? Then I hope the caps I put will hold out until I find a better replacement. Maybe I should not set the brightness to high. Will that work?

[phantom_zero]

Re: Cap Identification

How about this? I connect in series 5 pieces of 330pf 2kv to make 66pf 10kv. Would that work? Will there be a problem with the ESR adding up? Or with the current no longer divided between parallel capacitors?

[budm]

Re: Cap Identification

If you can balance all the Voltage drops on each cap and keep.
You do not have any source from local TV repair shops?

[phantom_zero]

Re: Cap Identification

I've been looking for days, very few 6kv capacitors and no 39pf or 33pf

[phantom_zero]

Re: Cap Identification

Ok... I had the chance to test the TV out for about a little more than an hour last night then the backlight went off again. So I guess the 33pF/1KV caps I parallel connected can't really handle it. It was a bad idea because I think good engineering practice would be to use a rating that is twice the operating voltage. I'll try replacing them with the series connected 330pF/2kv now but according to some file I read, to ensure that the voltage are distributed equally among the series connected capacitors, one should connect resistors of same value in parallel to each capacitor. Acting like a voltage divider. Since resistors have also tolerance, the voltage may not be accurately divided. Should I use precision type? or would the ordinary ones suffice? like maybe 5% tolerance? another question is, will an ordinary carbon composition resistor suffice? and what wattage? I can compute for the wattage by P=IV=I^R=V^2/R but the question again would be what value the resistor would be. Is it better to use a low resistance or a high resistance? If I use a higher resistance, I can use a resistor of lower wattage. Am I right?

[budm]

Re: Cap Identification

The typical resistor Voltage breakdown is around 500V so you you will high voltage resistor, and when the resistor is connected in parallel with the cap the impedance will have to be calculated base on the frequency of the applied Voltage so it is not that simple.
Get the correct caps and repair it the right way.

[jason123]

Re: Cap Identification

Hate to revive this thread.. but as someone who has been through some pain with putting 2 capacitors in parallel to get the 39pF... maybe you don't want to do that. It works, actually it works just fine without these caps.. but eventually one will burn up! Had to replace twice.. and finally got to the bottom of it.. first off.. I'm not sure 2 parallel caps is a good practice in general - in design, we do that only when absolutely necessary due to interaction between ESL / ESR and other capacitor characteristics. Furthermore, caution must be exercised when replacing the parallel cap (39 pF 6kV.) Not all ceramic caps are created equal. You need to use very low leakage cap, with reduced self-heating - otherwise they'll heat up and burn again in few weeks / months..