Pioneer Elit 1120HD Power Supply issue?

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

I disconnected the X/Z and Y board and the power supply was still on. 3 blinking red lights and the constant red light on the board.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

I disconnected the X/Z and Y board and the power supply was still on. 3 blinking red lights and the constant red light on the board.

OK so the power supply went into shutdown state again?

This could be a control board issue possibly.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

Disconnect cable.from power supply to control board. This is a board with the red flashing lights on it. And then power up

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

Yes it went into shut down state.

I then disconnected the control board and now the front panel light is constant red.

The control board is the one in the picture here, correct?

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

Yes however I'm not sure if that's going to Tell what's going on now that I think about it. I don't think the TV can achieve turn on command with that board disconnected.

I know that Pioneer is very tempermental with voltages and shutdowns.

Wondering the power supply lost a voltage. The only way to tell would be to measure voltages when you can

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

Do I plug everything back in before I test the voltage?

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

1st do the voltage test with nothing plugged in and then write down your finding then plug everything in 1 by 1 do your voltage test again in write down the finding.

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

Please look at the picture of the full opened back and circle the pins I need to probe. That will help a lot.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

, I don't have a computer where I can circle at the moment however you could probe P4 connector on power supply pin labebeled VSUS

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

This pin should have somewhere around 150 to 200 V DC it will be quick but you should see the voltage come up before the shutdown. What I would like to see is the voltage there as you plug in both x and y one at a time. You can reconnect the control board now before the test.

Also on the scan drive boards or known as the buffer boards you see the square style ICs all in line? Do any of them look burned or hole blown through?

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

This is what i plan to do. Plug in the control board. Leave the x and y boards unconnected and then test the p4 connector. Is that right? Then connect the y board and test again? Then connect the x board and test again?

Not sure if this will be done tonight but will try.

I would be really helpful if you could circle the pins I need to test and what setting on my voltmeter should be again....

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

Thats correct. Ill get a picture to yiu but you will need to get me a picture of P4 connector. Pin labeled VSUS on that connector is where you will place the red probe. Black probe to chassis ground and 400vdc setting on volt meter. This is the sectioin where it has one solid line and one dotted line on the voltmeter

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

Here are the pictures of the connectors. The one with the drawn circles are on the power supply board. P3 goes to the Y board. P4 goes to the X board. The other picture is the connector on the Y board that goes to the P3 connector on the power supply board.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

Good picture of that connector.

From the bottom you have SUSGND. 4th pin up from that is VSUS. This is the pin you are going to put the red probe on.

Don't worry about putting a probe on the wrong pin if by accident, youre not going to hurt anything. With the probe stuck into the pin and holding it there and the black probe on anywhere chassis ground, And you are voltmeter set to DC like I explained before , quickly watch the Volt meter screen and tell me what voltage you see.

Repeat this after you connect the x board up and then after you connect the Y board back up.

See if the voltage stays the same after every reconnection.

When you connect these boards 1 by 1 make sure the TV is unplug and you let it sit for at least 5 minutes before connecting each board up as there will be residual held voltage in the power supply that needs to drain off or the connector will arc.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

The reason we are doing this is because I am looking for a severe drop of this VSUS voltage within either the X or the Y board when connected in circuit. This will determine which board is causing the issue and if it is within the Y board it may be a shorted buffer board.

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

This is the pin I want you to put the red probe on.

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

Great thanks! I will test this afternoon and let you know.

[Boyd1966]

Re: Pioneer Elit 1120HD Power Supply issue?

I did the testing.

Y connector not connected - 220 or so then once it shut off went to 15
Y connector connected - 220 or so then down to 15
X connector connected - 220 or so then down to 15

[freakaftr8]

Re: Pioneer Elit 1120HD Power Supply issue?

Ok at this stage I am going to assume that your power supply is putting out good voltages and your sustain boards are free of shorts. We need to look at the scan boards (buffer boards). There are two of them. Upper and lower. On this board near the connector that goes to it, there is a test pad labeled VH.

Test this with your voltmeter same way you did the test with VSUS, except red lead on VH instead.

Do this with both upper and lower.

[tom66]

Re: Pioneer Elit 1120HD Power Supply issue?

You would need to check VH to the floating-ground output and it should be roughly 150V