Chimei CMV222H fuse identification

[o3365566]

Hi all,
I succesfully repaired my lcd monitor (replaced one cap and one mosfet) but I still need to replace the fuse F1 in the picture.
It is white with a "3" marked on it.
Could you please help me finding the correct reference?
Thanks!

[budm]

Re: Chimei CMV222H fuse identification

That will be 3A fuse for the T-CON. I cannot tell the dimension of the body of the fuse. Can you measure it?

[o3365566]

Re: Chimei CMV222H fuse identification

Thanks for your rapid answer!
I think it is in a DC to DC Boost Converter Circuit behind the top of the panel and it's approximately:
L = 3mm
W = 2mm
H = 0.8mm

What is T-CON?

[selldoor]

Re: Chimei CMV222H fuse identification

Here is a selection

http://shop.ebay.fr/i.html?_nkw=3a+s...LH_TitleDesc=0



TCON is another name for the panel board as in your picture

[budm]

Re: Chimei CMV222H fuse identification

Just search for either SMD 1206 3A fuse, or SMD 1210 3A fuse. That fuse is for supplying the power to the whole T-CON board.
T-CON = is the timing control. LCD TV will have replaceable T-CON board, the computer monitor LCD assembly will have non-repalceable T-CON attached to the LCD panel, like yours.
LCD monitor T-CON board:
http://s807.photobucket.com/albums/y...t=DSCF0882.jpg

TV T-CON board:
http://s807.photobucket.com/albums/y...t=DSC02397.jpg

[o3365566]

Re: Chimei CMV222H fuse identification

So I found this one:
http://uk.rs-online.com/web/p/non-re...fuses/6242991/

Is voltage important? 32 or 63V?

[budm]

Re: Chimei CMV222H fuse identification

We only dealing with 12V at the most for the voltage that feeds that fuse, 32V or 63 will be just fine.

[o3365566]

Re: Chimei CMV222H fuse identification

Thank you very much for you help!

[o3365566]

Re: Chimei CMV222H fuse identification

Hi all,
I'm here again because after replacing the fuse (3A) my display worked for about 5 min and then fuse blown again.
Now I have 2 hypothesis:

1. Fuse isn't the right one and I need a greater one (in current).
2. Other caps are gone (but they all look ok!) and so my display works for a few minutes and than the broken cap burn the fuse again.

The power mosfet I've changed in TCON is this one:
http://uk.rs-online.com/web/p/mosfet...stors/7377228/

It states Maximum Continuous Drain Current = 6.3 A. Is this important for correctly choose the fuse?

Thanks in advance!

[selldoor]

Re: Chimei CMV222H fuse identification

Was the mosfet an exact match for the one you replaced.
You could try a 4a fuse will still blow if there is a real problem without causing any damage ( They often are 4 amps in that position on other boards.)

It is also possible to get two types of fuse fast blow and slow blow**. If you had fast blow it will blow immediately whereas the slow blow will tolerate a slight excess for a short time


EDIT ** also called fastacting and antisurge

[o3365566]

Re: Chimei CMV222H fuse identification

Was the mosfet an exact match for the one you replaced.

I'm not sure because othe original was completely burnt so I looked for the nearest IC and found an FP5139. Than I searched on internet something like the circuit in the monitor and I found this:


In figure 14, there is a circuit similar to mine and the reference for the mosfet is AP2306GN. So I found that:


And finally I looked for something equivalent...

Actually I have same 3A fuse spare but no 4A so I thought to use 2 of them. Do you think it would be a stupid test?

Thanks!

[selldoor]

Re: Chimei CMV222H fuse identification

I dont know whether using a 5.3A mosfet would merit a bigger fuse.
as we dont know what was in there before.
Using 2 fuses - again I dont know if two 3 A fuses in parallel = 6 amps.
and if there is aproblem then will the mosfet blow before the 2 fuses?

Better wait to see if you get someone on who knows.

[budm]

Re: Chimei CMV222H fuse identification

That T-con should not be drawing maore than 3A for a 22" screen. I believe you still have shorted circuits on the board somewhere which is why it blew the original fuse in the first place.

[o3365566]

Re: Chimei CMV222H fuse identification

I think 2 3A fuse in parallel are equivalent to a 6A fuse.

PS: I didn't say that the original problem was a cap + burnt mosfet. Fuse was OK. It's my fault if it's burnt.

[o3365566]

Re: Chimei CMV222H fuse identification

That T-con should not be drawing maore than 3A for a 22" screen. I believe you still have shorted circuits on the board somewhere which is why it blew the original fuse in the first place.

You beat me on time, in my last post I added that original fuse was ok. I burned it doing some test...

[o3365566]

Re: Chimei CMV222H fuse identification

I didn't find a way to change the thread title so I created a new thread for the new problem here:
https://www.badcaps.net/forum/showthread.php?t=24273