Sony KDL46w4100 tcon board F1 fuse

[aerospacejackson]

Hello, a tv repair place has identified my TCON board as being bad offered to fix it for 300 dollars, took the tv home and pulled the board, i am getting no continuity and my resistance is showing open through the F1 Fuse. On the surface of the fuse it say LF 7A, any idea as to a part number so i can order a new one? the model on the board is 404652ASNC6LV3.7.

[budm]

Re: Sony KDL46w4100 tcon board F1 fuse

You can try this:
http://www.digikey.com/product-detai...1CT-ND/1905919

You lay a new fuse on top of the old fuse and solder both ends to the old fuse.
The board may have short circuits, so order more then one.

[tom66]

Re: Sony KDL46w4100 tcon board F1 fuse

Just to check though - the symptom of the fault, no picture, but screen is lit up, and sound is present? Post a picture of the board, there could be a shorted ceramic capacitor on it.

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

Yes, those are the exact symptoms, turns on screen lights up, good sound, then after about 15 seconds it shuts off the standby blinks 14 times. Ill try to post a good picture of the board

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

also how would i check a the capacitor?

[tom66]

Re: Sony KDL46w4100 tcon board F1 fuse

also how would i check a the capacitor?

With a multimeter... but post some pictures so we can highlight the possible ones.

I guess the TV is shutting down because it is not seeing the T-con working. I have not worked on any Sony TVs so I don't know if this is how they do it. It seems kind of strange to me.

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

ok just one minute ill have a picture to post

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

here it is

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

This is going to be my first adventure into surface mount soldering so if you have any pointers there i appreciate it

[budm]

Re: Sony KDL46w4100 tcon board F1 fuse

Can you see those light brown rectangular shape, they should have something like Cxx next to them, they are MULTILAYER CERAMIC CAPACITORS (MLCC).
Set your Ohm meter to 200 Ohms range and just measure the resistance on both end of each cap, we are looking for something in less than 2 Ohms (the resistance had to be low enough to blow 7A fuse) if they are bad.

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

not sure what you mean about setting it to the 200 ohm range, the multimeter im using is a fluke 115 truerms multimeter when i set it to ohms it looks like it has an auto setting the the side it has a M and the ohm symbol. when i put that on any of the ones next to the fuse (c372. cd253) they read between 6 and 8

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

but the fuse just reads OL as if it was open

[retiredcaps]

Re: Sony KDL46w4100 tcon board F1 fuse

they read between 6 and 8

6 and 8 what? Ohms, k ohms, M ohms? If unsure, press hold, take a picture and upload it.

[retiredcaps]

Re: Sony KDL46w4100 tcon board F1 fuse

Hello, a tv repair place has identified my TCON board as being bad offered to fix it for 300 dollars, .

What a complete ripoff!!

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

M ohms, at least the guy was honest, he said "we can fix it for 300 but i wouldnt recommend it. Since the screen itself is going bad, i just want to get this fuse fixed and hopefully buy a few months out of it.

[budm]

Re: Sony KDL46w4100 tcon board F1 fuse

"but the fuse just reads OL as if it was open" that is correct reading since you have blown fuse.
I think you can activate manual range setting of your meter, see your user manual.

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

when i activate manual at the bottom it has a 6 and then when i press range again it goes to 6 0 then 6 0 0

[budm]

Re: Sony KDL46w4100 tcon board F1 fuse

Lets do this, put meter in Ohm mode, then short the test leads together and then step through the range and tell us what you see.

[retiredcaps]

Re: Sony KDL46w4100 tcon board F1 fuse

when i activate manual at the bottom it has a 6 and then when i press range again it goes to 6 0 then 6 0 0

Since I have a Fluke 117, you want the one that says 600 ohms. This is the lowest scale.

[aerospacejackson]

Re: Sony KDL46w4100 tcon board F1 fuse

I have placed the fuse on top of the old one and soldered the ends, the tv fires up now and does the same thing it did before regarding lighting but no picture but the problem where it shut itself down has stopped. Any ideas?