Toshiba 40RV525U Blows Fuse

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

0.2 k in circuit. Should i pull one side and test that way?

[budm]

Re: Toshiba 40RV525U Blows Fuse

Just lift one leg off the solder pad and measure them again, it is more likely that they have been damaged by the surge. The circuit will function without them, it just will not have any surge protection function any more.
Since you keep blowing the fuse due to shorted out component some where on the board, you can damage more component by trying to power it up and keep blowing the new fuse until you find the cause of the problem. I would use a 100W lamp in place of the fuse, if the lamp glows bright and stay bright ,then you still have shorts in the circuit.
This is what I use instead of keep blowing the new fuses:
http://s807.photobucket.com/user/bud...tml?sort=3&o=0

http://s807.photobucket.com/user/bud...tml?sort=3&o=1

http://s807.photobucket.com/user/bud...tml?sort=3&o=3

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

They read open OL

[budm]

Re: Toshiba 40RV525U Blows Fuse

So do you still read 0.2K on the copper pads of the TVSS where the TVSS is removed?

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

No higher 0.7 m
SO those are shorted?

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

1.3 m the other way

[budm]

Re: Toshiba 40RV525U Blows Fuse

0.7 Mega Ohm (700K) is find, so how did you get it to show 0.2K (200 Ohms) BEFORE lifting the legs of the TVSS? and now you are getting 700,000 Ohms! Something is not right in your reading. Both TVSS show 'OL'?

[budm]

Re: Toshiba 40RV525U Blows Fuse

Take the resistance reading of these 3 sets of test points for me.

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

I put them back in circuit and i have 1.3 and o.7 the other i must have had a bad reading the first time. They do read OL out of circuit. Sorry ain't sure what i did the first time.

[budm]

Re: Toshiba 40RV525U Blows Fuse

In K Ohms range? How about readings on the post 48?

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

A - 1.7 m 2.5 m
B - 2.0 m 3.9m
C - 1.5 m 1.7m

I checked both ways

[budm]

Re: Toshiba 40RV525U Blows Fuse

No short there.
Take the bridge rectifier out and see if you will still blow the fuse.

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

OK without bridge

[budm]

Re: Toshiba 40RV525U Blows Fuse

So it does not blow the fuse without the bridge, we also tested those 3 sets of test points after the bridge which shows high resistance as shown in post 48, then please test the bridge read out off the board again.
By the way, what size fuse are you using?

[mr2013e]

Re: Toshiba 40RV525U Blows Fuse

see post #25.as budm says bridge pins touch chasis ???

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

The bridge tests on the center two pins OL both ways and on the outer two pins it tests OL one way and 4.406m the other way. Next to the bridge is vs102 and vs101, when i was reinsalling vs102 it broke in two. Does anybody know exactly what that is so i can get a new one ordered.

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

I think i will order a new bridge when i get the other part just to remove all doubt, if its good or not.

[mr2013e]

Re: Toshiba 40RV525U Blows Fuse

remove fb101.fix fuse.and plug ac cord.we would check u501 and devices.by the way only cy103 and fb101 removed .if the main fuse not blown .lets see.

[fxdfireman]

Re: Toshiba 40RV525U Blows Fuse

Can someone please help me identify vs101 and vs102 so i can get a new one. I don't know if it pays to try anything until i get this replaced. Right now i do not blow a fuse when i plug it in with these two out of circuit.

[tom66]

Re: Toshiba 40RV525U Blows Fuse

You may run the set temporarily with them missing. Fuse should not blow & set should power up.
Then install a 220V TVS e.g. http://www.digikey.com/product-detai...ICT-ND/3306426