Pioneer PDP-LX5090 8 blinks

[PowerAmpFreak]

Hi all,
I changed the always failing A/V board regulator and set comes on.
BUT - if set is turned off after about 10-15 minutes (minimum) the set will go into protect and show 8 blinks.
Let it cool down for a few minutes will make it start again.

SO, what is this?
Could the new regulator be out of spec?

[tom66]

Re: Pioneer PDP-LX5090 8 blinks

Could be. Make sure to check the 1.8V from its output is stable. (Ideally use a scope to see it is not oscillating either.)

Also, refer to the service manual - there is a way to get an orange blink code along with the blue code, which will tell you the exact area of the 8-blink fault (or at least the first area that fell over.) Might help in diagnosing the fault.

[PowerAmpFreak]

Re: Pioneer PDP-LX5090 8 blinks

The 1.8V regulator is working just fine all the time, even when the 8 blink code is active.
According to service manual by pressing a button on remote 'DISPLAY' will start an orange led blink sequence aswell to give more info.
The problem is: The remote does not have this button even if its a original remote.

[PowerAmpFreak]

Re: Pioneer PDP-LX5090 8 blinks

The issue is really strange:

Turn on TV from cold it works perfectly for hours. It does not shut down.
IF you turn it off, and try to turn it on again - 8 blink code.
So, during start-up when hot, the diagnostic system detects something that it does not care about as long as it's up and running.

[tom66]

Re: Pioneer PDP-LX5090 8 blinks

8 blinks is I2C comms error, could also be caused by a number of other faults like loose connectors or other regulators faulty.
You need to identify what is missing during the fault.

Instead of DISPLAY it might be DISP INFO or INFO? You may as well try a few buttons to get that orange code. I have definitely got it before on UK version of PDP-LX5090.

[PowerAmpFreak]

Re: Pioneer PDP-LX5090 8 blinks

8 blinks is I2C comms error, could also be caused by a number of other faults like loose connectors or other regulators faulty.
You need to identify what is missing during the fault.

Instead of DISPLAY it might be DISP INFO or INFO? You may as well try a few buttons to get that orange code. I have definitely got it before on UK version of PDP-LX5090.

I found out, the 'DISPLAY' button is included in a factory remote.
I have tried other buttons on the user remote, but I could try more.
The service manual does not cover on component level, only block level.
I have found things on mainboard that differs when set goes into protect and not, but I cannot trace since the manual only refers to changing assys.

[tom66]

Re: Pioneer PDP-LX5090 8 blinks

Try the button below the number 9 on the remote - the one that brings up source info. Found that on a forum online. The orange blink code will tell you what block failed to help you pin it down.

If the first block failed that just means the first test fail, it could also be a voltage regulator fault for that part of the circuit, e.g. 1.8V or 3.3V missing. You should check the 1.8V regulator to see that the output is not oscillating/unstable under load, sometimes regulators can fail in that way.

I think you can using RS232 access service menu to run panel test patterns and get error history, if that is useful to you.

[PowerAmpFreak]

Re: Pioneer PDP-LX5090 8 blinks

Today I had the chance of swapping the A/V board which includes the 1.8V regulator. The 8-blink code is still there.
Also PSU was swapped with no change in behaviour.
It boils down to a problem on main board.

I wonder what software is required to reach the RS232 access service menu?

[tom66]

Re: Pioneer PDP-LX5090 8 blinks

Today I had the chance of swapping the A/V board which includes the 1.8V regulator. The 8-blink code is still there.
Also PSU was swapped with no change in behaviour.
It boils down to a problem on main board.

I wonder what software is required to reach the RS232 access service menu?

Something like Teraterm or PuTTY will work, you will need to be able to enter escape characters like x01 and x00. I have a guide in one of the PDP-LX5090 threads...I'll try dig it out.

[PowerAmpFreak]

Re: Pioneer PDP-LX5090 8 blinks

Anyone know what this repair service include:
http://www.ebay.com/itm/Repair-Servi...kAAOSwewJTmuWG

This is a mainboard repair and probably what is faulty in my case.

[bruno504]

Re: Pioneer PDP-LX5090 8 blinks

Anyone know what this repair service include:
http://www.ebay.com/itm/Repair-Servi...kAAOSwewJTmuWG

This is a mainboard repair and probably what is faulty in my case.

Any advance on this? known problem? solution for fixing it?