Pioneer Kuro PDP-LX5090 7 blinks intermittent

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Farnell is cheaper TBH... I have to get some parts from there and I do want to order a few more than one.
Thanks for the link though.

[vinceroger69]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

any time you want prices from that site let me know i have my log in details again now they are cheap on some things and expensive on other bits but there again its a independent business so probs high over heads.

[tw2005]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Aside from the clipped ground lead, it looks like BA18BC0WFP will fit (the tab is still grounded, which is probably the only important thing.) It's available from Farnell.

Congrats, you got your KURO

Got a feeling you may find something like BA18BC0WFP on some Panasonic DG boards, TNPA3519 as an example.

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

I'm watching it in the dark, WOW! The picture is real good. But it does have the red haze I will need to fix. Also apparently you can tweak the V presets in the service menu to get down to 9.5G black level, so I know what my project is when I get it on the wall proper.

[mmartell]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Good for you, tom, you finally got that Kuro. You deserve it. Now don't spend too much time watching it

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Fixed! It was that regulator.
I used the Rohm part from Farnell.

[vinceroger69]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

cool a nice fix tom bet this will have more use than your panasonics you like if this new set was for sale fully working whats the going price? ive never read up much on these pioneer kuro s but will make time too.

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Fully working, about £800 to £1,000, for a 5 year old TV.

[vinceroger69]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Thats really good then they still hold the price well ive never saw the picture quality in person on one but i will take your word its great ive just re read this thread you say you are going to adjust some settings using a pc?

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Yep, they do hold the money well because there is nothing yet that can compete with them save for OLED TV but they are £6,000+ at the moment. Hopefully we will get to see OLED panel reliability being better than that of LCD but I do not have high hopes.

I calibrated the TV using reference settings made with someone else's panel (good enough for me.) The picture quality - the contrast on a film like Gravity is amazing. But not only that it responds really well to motion and scene changes, there is zero motion blur.

I also got some scope shots of the drive waveforms which are unique. I have never seen a panel driven like how Pioneer do it. They use twice the number of subfields as Panasonic do, and they use flat initialisation voltages - no ramps at all (SET UP/SET DN are not present on these Kuros.) Bizarre!

Yes you can use an RS232 cable to access the service menu on these and tweak things. In particular the panel has a slight red tint to the black level which I want to reduce. I will try to reduce the black level as much as possible, whilst maintaining panel performance.

[Shinju]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

you fix the red in blacks issues too?

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

you fix the red in blacks issues too?

Soon, I will get the required cable. None of my PCs have RS232 ports on them anymore, so I have to use a USB to RS232 cable.

[vinceroger69]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Sounds a very nice set i bet this is one set you will never part with.

[Shinju]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Awesome score! I am jealous!

[vinceroger69]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

same as i think he should lend it to us to soak test for a few years haha.

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Anyone coming up towards Leeds is welcome to view it, but you will have to pry it out of my cold dead hands if you want it

[audiofreak19]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Hey tom I just realized I got a free tv from my buddy that was his gf dad's tv. He bought it in 08 a pdp-6020fd. It was delivered with a cracked screen 10,000 dollar tv. And when they delivered the new one they never picked up the old one. He gave it to me free and I'm parting it out. Shofar main board sold for 280 dollars. But I was looking at the manual which is a college text book and it said kuro. I didn't even realize it was a pioneer kuro tv.

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

The parts for these, such as the AV board are worth a fair bit. Control board sometimes fails, but again that is rare. The sustains & power board are generally not worth much because they very rarely fail, too well built!

[audiofreak19]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

Yea this thing was a pain in the arz to disassembly. Total of 20 boards if you count all of the tab drivers.

[tom66]

Re: Pioneer Kuro PDP-LX5090 7 blinks intermittent

OK, the red tint is annoying me a lot when I go to watch dark movies, so I'm going to fix it.

Kuros have two main ageing counters, an hour counter and a pulse counter. Hours accumulate as the TV runs - mine has about 12,700 which is quite a bit, although it shows no burn in or significant degradation yet. The pulse counter basically keeps track of how much the panel is sustained - it's a rough count in the order of 600 billion for this (if this sounds like a lot consider the panel is sustained at about 200kHz at ~33% duty cycle so the numbers quickly add up.) This, IMHO, is a bad idea because it means the ageing algorithm does not take into account the display's age any more, so you will see maldischarge or other issues as the panel gets older.

Instead of a complete reset, the panel needs a little tweak -- in voltages.

On a Kuro this is done entirely via the service menu, you never (and should not!) ever tweak a single pot... it can be done with the cover on too. In fact you can adjust a huge amount of stuff - the phase between the sustain boards, energy recovery, even the ABL level (which is potentially risky as you could cause the PSU to shut down on bright scenes.)

To enter the service menu you do need an RS232 cable or USB to RS232 and then you send the TV the command "FAY" and you can access it. Only enter it if you are prepared to live with the consequences of any change and/or understand what you are doing.

My current settings are (the code represents a relative voltage change rather than an actual voltage, most voltages are 0~256 range):

VOL SUS = Vsus/Vs = code 128 (measures 212V)

VOL OFFSET = appears to be similar to -Vy/-Vad/-Vsc on other panels = code 140

VOL RST P = appears to be similar to the -Vy first ramp voltage (on most panels this is not adjustable, it is fixed to -Vy) = code 031 (this significantly affects panel black level & initialisation)

VOL XPOFS1 = appears to be related to Ve/Vzbias = code 085

VOL XPOFS2 = appears to be related to 2Ve on Samsung & Ve2 on Panasonic (only used on high end Samsung/Panasonic panels with deep black level, 2nd erase/initialise bias voltage.) = code 047

VOL YKNOFS1 D = not sure what this is, but may be a ramp voltage or a 2nd Y-drive bias voltage = code 143 (must be adjusted with YKNOFS3 & 4 by same amount.)

VOL YKNOFS3/4 D = also not sure but related to YKNOFS1 D = code 128

VOL YKNOFSAD = handy adjuster which moves YKNOFSA1,3,4 all at same time = code 128 but suspect value is nominal or reset each time, simply a tool not an actual voltage

There are some other adjustments but since they are all at 128 I suspect they are to be left unchanged as they are only there if Pioneer decided they need adjustment later. The voltages are particular to each panel so I need to change those rather than any reset pulse widths etc which are generally particular to a panel type rather than individual panels.

More to come soon on the Kuro tweaks.