Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

see post 39

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Yeah, I put the - probe on pin 1(+) and tested 2,3,4 How do I test pin one? That's the one I didn't read I guess. I saw a youtube vid from tampatec and thats how he tested it I believe so figured I was doing it right.

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

OK, that explained why 3 readings. So you should also test red probe on pin 4 (-) against 1, 2, and 3 to see what you get, but you have to remove it from the board. That kind of test you did will not show if one of the diode has open circuit because there are two set of diode in parallel. If you draw up what are inside the bridge you will understand why.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Oooh...Got ya. Thanks for taking the time to help me on this. I'm sure it'll help others down the road who are novices. I'm about to take them out of circuit but they're all showing .5's now brb

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Okay, out of circuit I'm getting.

Pin 1(+) 0.91
Pin 2 0.49
Pin 3 0.49
Pin 4(-) 0.93

I believe .4 to .7 is good readings right but the .9's and up are bad?

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

OK, lets do this:meter in Diode mode
Black probe on + (pin 1) red on ~ (pin 2) it should read about 0.5
Black probe on + (pin 1) red on ~ (pin 3) it should read about 0.5

Red probe on - (pin 4) black on ~ (pin 2) it should read about 0.5
Red probe on - (pin 4) black on ~ (pin 3) it should read about 0.5

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

I'm getting 0.52 and 0.53's

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

All 4 readings? if that is the case there is no shorts or open diode, the bridge is OK.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Yep, all are showing 0.5's Was hoping it was bad so I knew at least one part to order/replace lol

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Put the bridge back in place. Another test, put meter in AC Volt and measure the AC voltage on the two pads where the TVS legs was solder to, it should show 120VAC.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

I plugged it back in and got 16-17 v by probing the top side of the holes. I did put it back in circuit(bridge) as well. Edit: I flipped it over and probed the pads and got 005. v

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

OK, that is not right, it should be 120VAC.
Take two AC voltage readings as shown in the pictures.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

First test I got 4-5v and 2nd test was 5v Is that green round part on top side the MOV? Is that bad since it's not reading 120vac?

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

That THxx is the inrush current limiter. I cannot see why you only getting 4~5V, that '1' reading is the voltage between N (Neutral) pin of the incoming AC and one end of the fuse (in this case the lamp).
There is no way you only getting 4~5VAC at those two points of '1' test points, you lamp is good? Something is not done right or measuring right.
What do you get at L and N where the AC connector is connected too?

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Oh wait, I was testing with the fuse out and no bulb...Is that what you're calling lamp?

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Of course! so you were reading at the + and - at the earlier post with no lamp connected also?

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

I am going to bed.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Well that one was my fault for sure!! I still didn't get high readings on the points you pointed out but I put one probe on N and the other on one of the pads for the fuse holder and got 124vac and I put the other probe on the other AC line, L I think it was and probed the other fuse holder and got the same 124vac. I know it's not what you had outlined but I probed around after you said N and fuse and found 120vac that way.

On L and N I do get the 120VAC coming in.

[ALR]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

Okay so after going back over the steps, I got the 150w flood light to light up with everything connected back on the board.

I removed that TVS off the board and tested again. Bulb didn't light up, just sparked from trying to get the contacts to connect thinking I wasn't holding it on the connections right..

Put the TVS back on the board and tested again, boom bright light...Took it back off and couldn't get it to light up at all.

So, if the bulb lights up, there is a short somewhere and if it never lights up, no shorts?

I'm really crossing my fingers that I found the component that's causing all my problems.

[budm]

Re: Toshiba 40RV525RZ-No Power/Standby-Power Supply Help!

TVS in, lamp lights up, TVS removed, lamp does not light: it means the TVS is shorted, so I do not know what you did wrong when we tested it before.
Leave TVS out and check the DC voltage on the B+ and primary ground again.