ly s1.6kv 54j

[motormat]

Re: ly s1.6kv 54j

I have no idea when I talked to them I told them I needed part number for c402 on the power supply board and they gave me the number I posted earlier.

[tjg79]

Re: ly s1.6kv 54j

You should call them back and tell them they gave you the wrong part number, and get the correct part number.

Tell them that there are caps with the same number on different boards and they didn't give you the cap on the power inverter board. Whomever you spoke with was likely looking at the wrong cap. You should speak with a tech and not a customer service rep.

[budm]

Re: ly s1.6kv 54j

You need to give them the power suppy-inverter PCBA (not PCB P/N which is the BLANK BOARD P/N) P/N as printed on the barcode sticker so they will know which assembly and which version of the assembly you are trying to get the parts for.
Example:
http://www.shopjimmy.com/lg-eay60990...upply-unit.htm
SJ: ' Partial part number(60990201) is found on barcode sticker.'

[tjg79]

Re: ly s1.6kv 54j

Parts Research Request:

http://www.encompass.com/staticpages...Model_Research

The above link is likely your best hope of getting the capacitor's part number and specs from LG. Encompass is the authorized LG parts distributor.

You need to be very specific and supply the correct information as budm indicated. You want to supply the TV model number and serial number, the power-supply inverter pcb assembly part number, and the capacitor number, in this case C402. While your at it, you could request C401 as well. They should be able to give you the specific information, if you give them the correct information.

You could also indicate a description of the bad capacitor. In this case, you should indicate that it appears to be a through-hole high voltage ceramic capacitor on the TV's power-supply inverter board, or pcb. Also, I would indicate the inscription on the capacitor.

You can attach pictures as well. You should take care to post good pictures so as not to confuse the researcher.

If they can provide the information, it would be a good check of what we suspect are C402s specs.

Regards

[tjg79]

Re: ly s1.6kv 54j

Also, after looking at your pics of the C402, I now think it reads LY S1.6KV 54J as your originally noted.

Therefore, I don't think it's a 54pF 6000V 5% Tolerance High Voltage Ceramic Cap.

I think it's a 54pF 1600V 5% Tolerance High Voltage Ceramic Cap.

A better replacement is indicated on the link below.

These are 56pF 2000V 5% Tolerance High Voltage Ceramic Caps. They are closer to the original spec than what I indicated before.

http://www.mouser.com/Passive-Compon...z0z7l5Z1z0wuod

Regards

[rhomanski]

Re: ly s1.6kv 54j

Too bad they're not stocked. Might have worked.

[tjg79]

Re: ly s1.6kv 54j

Too bad they're not stocked. Might have worked.

I noticed that, but they do indicate a price for one and they might backorder.

[budm]

Re: ly s1.6kv 54j

That firing Voltage is almost 2000V, I would not put in 1600V cap Stick with 6000V or 6300V.
The cap is SL6KV.
Nothing wrong to be on the safe side with higher Voltage rating (6300V instead of 6000V). I would not do that to my own set.
http://www.electronicspoint.com/thre...estion.253545/

http://www.pontodaeletronica.com.br/...405-11399.aspx
Just search for 'SL6KV'

[motormat]

Re: ly s1.6kv 54j

So that first cap would work the 6000v 54pf +/-5% tjg first requested ? Just wanna be sure.

[tjg79]

Re: ly s1.6kv 54j

So that first cap would work the 6000v 54pf +/-5% tjg first requested ? Just wanna be sure.

The inscription on the burnt cap is difficult to read clearly. That is why you should get a confirmation by requesting the part be researched. Did you request the part be researched? I originally thought it read SL6KV, because "L" and "1." are very similar, S1.6KV didn't appear in searches, and I did get at least two results that showed a SL6KV, although different capacitance. However, after looking at your pictures again more closely, I think you are correct as indicated in the title of this thread. I think it's clear that C401 is a S1.6KV. I think C402 is the same voltage rating, but different capacitance.

If LG used a 1600v rated cap, then the closest that Mouser Electronics has to offer without dropping below 1600V is 2000V which is the next size up from 1500V.

I didn't see a schematic for the power supply inverter board.

The general rule for voltage with replacement caps is the same as the original or the next size up which in this case is 2000V.

A 6300V rated cap would likely work in place of an original 1600V, but I think the 2000V is the better choice barring analysis that indicates otherwise.

Without doing the circuit analysis, I don't know that the original 1600V rated cap was not the best choice.

Encompass can likely supply the part as well. They may be able to supply it sooner than Mouser Electronics, because Mouser shows the part as "not stocked."

I think your next step is to have Encompass research the part.

[budm]

Re: ly s1.6kv 54j

So you still think that the original cap is rated at 1600VDC, and you suggest that 2000VDC per spec sheet will also be fine instead of 1600VDC rating.

You forget one fact about using DC rating cap with AC circuit.
What do you think the AC Voltage of that DC Voltage rating cap when used in AC circuit (High AC output from the inverter transformer to drive the CCFL will be?
CCFL in TV runs on minimum of 1000 Vrms or more, and startup Voltage is even higher. LC420WUH is 1000Vrms (on one side, but since it is driven in push-pull mode, the diff Voltage between the two sides of the lamp is 2000V), striking Voltage is 1110Vrms
Will the Vp-p of 1000Vrms be higher or lower than 1000V?
Will 1600VDC cap or 2000VDC can handle 1000Vrms?
Look at the Vs Voltage as shown on #2.
I doubt that LG engineers are that bad to spec in 1600VDC caps in that high Voltage section of the circuit.

[tjg79]

Re: ly s1.6kv 54j

I'm not certain that C402 is a 1600VDC cap.

The first step is to identify what the OEM installed if possible. I think the resources are available to do that.

C402 & C401 could be SL6KV. If that's the case, then the 6300VDC rated cap is the best choice.

[budm]

Re: ly s1.6kv 54j

It is not a could be it is 6KV rating.
'I didn't see a schematic for the power supply inverter board.
The general rule for voltage with replacement caps is the same as the original or the next size up which in this case is 2000V' If you read the data of what the CCFL are running on, then you know what it should be. I do not know how much you know inverter circuit and CCFL and what is required for the circuit to function. So first step is to understand what the circuit you are dealing with, look at the spec of the LCD panel.
All you have to do is to search 'SL6KV', OP is not the only person that has problem with these caps.
So did you figure out what the Vp-p of 1000Vrms that is required to run the CCFL? or look at the attachments I provided from the LCD panel spec so you can see what the Vs being applied to the lamps. I recommend >6KV and you recommend 2KV.

'The general rule for voltage with replacement caps is the same as the original or the next size up which in this case is 2000V.

'A 6300V rated cap would likely work in place of an original 1600V, but I think the 2000V is the better choice barring analysis that indicates otherwise.'