245BW, can't find problem. No 24 or 6.3V, standby is good.

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Blue thing, starts out at about 34V's and slowly goes down as I measure it. If I stop for a few seconds and come back it starts out at 34V's again.

1. Does your meter have a capacitance range?

2. What are the numbers on the blue capacitor?

3. How are you measuring it's capacitance?

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Blue thing, starts out at about 34V's and slowly goes down as I measure it. If I stop for a few seconds and come back it starts out at 34V's again.

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Ok I will give it a check.

Yeah that is the IC I checked, how the hell did I get 18?

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Not sure what cap your talking about, and I don't see any other IC's to check on this thing.

Uh, huh. The cap is identified in the picture as Long Blue cap. The IC is identified as This IC and the corner pins are numbered 1, 8, 9, and 16.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Not sure what cap your talking about, and I don't see any other IC's to check on this thing.

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

One other point you should check is (CM512?), the long blue cap near the main SMPS transformer. The equivalent cap was the cause of problems on the BN44-00173A power supply. One point, on the other thread, I didn't see any signs of activity out of the SMPS controller, so I wouldn't bother replacing that cap, but if your DMM measures capacitance, it definitely is worth the trouble of removing it and verifying it is good.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Maybe I derped and measured the wrong one, I will check later.

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Apologies that it took me so long to get around to doing this, but here ya' go!

Meter on the 20V DC setting.

Well, that didn't work out very well. In another thread zulururu has the results and readings from the same pins. Here they are and what the pin does.
1: 5.05v Oscillator charge
2: 5.05v Oscillator return
3: 2.54v Oscillator control current
5: 5.08v 5.1 V reference
6: 0.07v Error amp out
7: 0.07v Error amp - in
8: 5.04v Error amp + in
9: 14.60v Enable adj.
10: 0v Fault input
11: 0.19v Soft start
12: 14.06v B output
13: 0v Gnd
14: 0.27v A Output
15: 15.06v Vcc
16: 5.04v One shot RC

One obvious problem is somehow you came up with an extra 2 pins. What is worse, zulururu has not updated his thread to indicate if replacing the main SMPS controller has solved the problem.

I'll be honest, I don't have any solid recommendations at this time, just suggestions.

You can repeat the measurements.

The other thread has links to sources for the main smps controller IC.

Searches for a schematic for this supply have been unsuccessful; perhaps you can have better luck.

If I had my hands on a dead BN44-00195A, I could confirm that the main smps controller is actually the problem.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Apologies that it took me so long to get around to doing this, but here ya' go!

Meter on the 20V DC setting.

1. 5.5
2. 0.01
3. 2.7
4. N/A
5. 5.7
6. 0.01
7. 0.01
8. 5.5
9. 5.3
10. 16.0
11. 14.4
12. 0.01
13. 0.01
14. 0.01
15. 0.01
16. 0.01
17. 0.01
18. 15.4

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Well whats pin 1 and whats ground?

Package designation here. Note the notch at one end, some manufacturers have a dimple by pin 1.

Use pin 4 for the ground point of the DMM. Perform the tests with the monitor plugged in, and the power led on (you may have to hook the monitor up to a signal so the monitor doesn't go into standby.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Well whats pin 1 and whats ground?

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Ugh it has like 20 pins!

Only 16. And I'm only asking you to measure the voltage on 15 of them.

If you would prefer, the power supplies are available on eBay.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Ugh it has like 20 pins!

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

ON: 422V
OFF: 168V

Volt meter on the 1000V setting.

SO YOU'RE SAYING I SPEND $9 FOR THAT NEW IC AND SHIPPING AND IT WAS FOR NOTHING!? >:|

EDIT: Oops double post. :|

Yes.

The next step is to measure the voltages on the main SMPS controller - ICM801. Set your DMM to the 20VDC range, use pin 4 as the ground point, and measure the voltages on every pin of the MC33067P. Report the readings.

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

ON: 422V
OFF: 168V

Volt meter on the 1000V setting.

SO YOU'RE SAYING I SPEND $9 FOR THAT NEW IC AND SHIPPING AND IT WAS FOR NOTHING!? >:|

EDIT: Oops double post. :|

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Hold it. Something is seriously wrong here. I've been dealing with the same power supply on this thread. The title of this thread indicates you have standby power. In post 1 you said the power light was on, that would indicate the standby supply was working....

Awww, crap!!! I'm sorry, I confused the S_B output with the 5.4 main output. Well, we're going to be following an existing trail.

First question: Does the power LED respond when you hit the power button - turn on and off?

If it does, the second question is: Does the voltage across the 82uF, 450 volt cap jump up to over 350 volts when the power LED is on?

PlainBill

Yeah power light turns on and off, and I guess I could check that. I will get back to you.

[PlainBill]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

That didn't do anything besides waste $8.

Hold it. Something is seriously wrong here. I've been dealing with the same power supply on this thread. The title of this thread indicates you have standby power. In post 1 you said the power light was on, that would indicate the standby supply was working....

Awww, crap!!! I'm sorry, I confused the S_B output with the 5.4 main output. Well, we're going to be following an existing trail.

First question: Does the power LED respond when you hit the power button - turn on and off?

If it does, the second question is: Does the voltage across the 82uF, 450 volt cap jump up to over 350 volts when the power LED is on?

PlainBill

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

That didn't do anything besides waste $8.

[Toasty]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

Try reading it this time.

[epicelite]

Re: 245BW, can't find problem. No 24 or 6.3V, standby is good.

I ALREADY FOUND THAT, check out a few posts up.