Spectre E325BV no power.

[Malachi]

Re: Spectre E325BV no power.

I don't see a board marked IC1

[Malachi]

Re: Spectre E325BV no power.

Diodes on the heatsink? The 3 legged components?

[budm]

Re: Spectre E325BV no power.

I don't see a board marked IC1

It is on the bottom side of the board.

[dick_barton]

Re: Spectre E325BV no power.

Its the 8 legged device (IC) at the top of the board.

Courtesy of Shopjimmy

[budm]

Re: Spectre E325BV no power.

Diodes on the heatsink? The 3 legged components?

Yes, D2, D3.
Check for LOW RESISTANCE between the center leg and either the two outter legs.

[Malachi]

Re: Spectre E325BV no power.

What is the number printed on the IC on the underside of the board marked as IC1

Dang, with my readers on and jewelers loops I can barely see it.
I think it's GR8876A
BC010

[Malachi]

Re: Spectre E325BV no power.

Yes, D2, D3.
Check for LOW RESISTANCE between the center leg and either the two outter legs.

Does it matter which lead goes where? Black in the middle?

[budm]

Re: Spectre E325BV no power.

If it is shorted out then it does matter, we are checking resistance so set the meter to Ohm mode.

[dick_barton]

Re: Spectre E325BV no power.

That's the right number. Your circuit should not be to dissimilar to the schematic. Maybe changing the capacitor budm asked you to heatup may get you going. You need to check you have voltages on Pin6 & 8


Data sheet

[Malachi]

Re: Spectre E325BV no power.

D2 with the black lead in the middle reads 3.4K Ohm.
D3 1.9K

[budm]

Re: Spectre E325BV no power.

D2 with the black lead in the middle reads 3.4K Ohm.
D3 1.9K

They are not shorted out, was looking for <10 Ohms or so.

[Malachi]

Re: Spectre E325BV no power.

Thanks. What's next?

[dick_barton]

Re: Spectre E325BV no power.

What were the voltages read on IC1?

[Malachi]

Re: Spectre E325BV no power.

I didn't check. No one asked and I didn't know. Lol.
One of the contacts read 70v, another -80v. How can it be negative?

[dick_barton]

Re: Spectre E325BV no power.

Post #29 but I think you were having a lot of questions fired at you at the time

[Malachi]

Re: Spectre E325BV no power.

You are right. Sorry dick. The pins aren't labeled that I can see.
Most of them have a negative reading. Only one has a +70v. The rest -80 or 0.

[dick_barton]

Re: Spectre E325BV no power.

I didn't check. No one asked and I didn't know. Lol.
One of the contacts read 70v, another -80v. How can it be negative?

Did you connect your negative lead of your meter to the negative lead of the large capacitor and not chassis.

[Malachi]

Re: Spectre E325BV no power.

No, since the board is off the the TV and laying on a piece of carboard, I put my black lead on a spot labeled GND.
I'll try again using your suggestion.

[Malachi]

Re: Spectre E325BV no power.

Doing it that way, only one pin gave a reading of 2.7V.

[dick_barton]

Re: Spectre E325BV no power.

Because I don't have the schematic for your power supply, looking at the pdf for the IC I posted earlier indicates that there are resistors up to the +ve supply of the large capacitor.

What voltage are you getting across the two terminals of that large capacitor?