pioneer pdp505pg plasma help

[confusedall]

Hi, I have a pioneer plasma that is doing the two led blinks on the front ....,power supply

Firstly i am capable of testing and fixing
things just dont have the knowlegde and experience to do it confidently....

once turned on it clicks the relay and simply cuts out after a sec.

I have done a huge amount of searching on alot of sites and tried to educate myself to fix this.....,also tried to hunt down a service manual not much success.

anyway I have taken the back off and inspected the power supply and there are no obvious signs of blown caps.
I have done a continuity test and everything seems to be ok there.
have removed y and x board and power supply still cuts out, on removing the y board a led on the dig board lites up red then green then all shuts down then a led on the power supply lites up orange

I have done some voltage measures, not sure wot i meant to be getting??

thanks for any help
can supply pictures if needed

[retiredcaps]

Re: pioneer pdp505pg plasma help

I don't know if PDP505PE is the same as the "G" model, but

http://elektrotanya.com/

has a service manual for the "E". Use IE8 for downloading.

[confusedall]

Re: pioneer pdp505pg plasma help

thanks for the quick reply,,
yes i have downldd that manual and it seems prety close to the boards i have but not 100% sure??

taking photos soon

[confusedall]

Re: pioneer pdp505pg plasma help

hope these help, in my endeavour to get better and more pics the battery went flat in the camera, will upload more when it has charged.

thanks

[retiredcaps]

Re: pioneer pdp505pg plasma help

I'm not sure what camera you have, but most of those pics are horribly out of focus. You seem to have enough light (indirect sunlight gives good results), but it seems like you are shaking. If your camera is showing 1/60 that is probably not enough light. Try to get at least 1/125.

If your camera has it, enable macro mode (most do) and optical stabilization (newer models).

[confusedall]

Re: pioneer pdp505pg plasma help

yea, sorry about that, im trying to stand wtih a torn knee ligament#@$ and currently charging camera battery, the service manual you suggested has exactly the same boards and power supply thanks

[confusedall]

Re: pioneer pdp505pg plasma help

here are some better images of the power supply, the camera battery again went flat before i could get some of the back of the board.

thanks for you help

[confusedall]

Re: pioneer pdp505pg plasma help

there are chk points on the board which Ive numbered,there details are

1, PFC OVP ON/OFF
2, PFC OVP CHK
3,+16.5V CHK
4,+12V CHK
7,VADR CHK
8,VSUS CHK
9,RV203 VSUS ADJ
10,STB 3.3V CHK

There doesnt seem to be a 5 or 6??

also (second image) there is white residue on this component,i cannot read whats written on it, it is hard to scrap off, and no other compnents have it??

if these photos are good enough for now, I will put the board back in and chk the volts again and report back??

thanks then and now and
in advance

[confusedall]

Re: pioneer pdp505pg plasma help

I measured the outputs while switching on in the short time it stayed on I got these results, shown on images,

[confusedall]

Re: pioneer pdp505pg plasma help

everything is powering up, all the 6.5volts went slightly higher,would this be the problem?? such a small amount over??? I did notice the volts raced up with all the 6.5 v outputs until powerdown while the 12 and 16.5 volts slowed the closer they got to the amounts i ended up with

thanks then and now and then

[confusedall]

Re: pioneer pdp505pg plasma help

here is a better image of the component that has white stuff on it.


Thanks in advance for any help

[confusedall]

Re: pioneer pdp505pg plasma help

Ive read a few threads here that suggest reading volts across the tops of caps?? to an earth ?? Is this a suitible way to test caps or is it just to see if they are working or not??

thanks for any answers

[cadiman]

Re: pioneer pdp505pg plasma help

Made in China is most likely what the problem is here.

The service manual should tell you how to isolate the boards to see if the Y or x driver boards are shutting the power supply down.

some of the pioneer tvs called the Z board (on the right) the X drive.

Pioneer power supplies are very hard to trouble shoot as you can see all the power plugs on the board. The manual will help, but you will need to do some reading. The power supply is also the reason for most of the problems on these tvs.

Reading volts across the cap tops is not a way to test them.

Pioneer plasma tvs are to me the most complicated, but worth the effort after seeing the picture they produce.

I buy all the pioneer plasma tvs I can find and have them shipped to me to repair and sell. They have a good following and are easy to sell.

I have one now and it has a Sony power supply made in China. Not happy about that, but it is still a pioneer panel.

The smaller caps on these do go bad. The larger caps have been ok so far for me.

I would be looking for problems in the secondary on these supplies.

Good luck.

[confusedall]

Re: pioneer pdp505pg plasma help

Made in China is most likely what the problem is here.

The service manual should tell you how to isolate the boards to see if the Y or x driver boards are shutting the power supply down.

some of the pioneer tvs called the Z board (on the right) the X drive.

Pioneer power supplies are very hard to trouble shoot as you can see all the power plugs on the board. The manual will help, but you will need to do some reading. The power supply is also the reason for most of the problems on these tvs.

Reading volts across the cap tops is not a way to test them.

Pioneer plasma tvs are to me the most complicated, but worth the effort after seeing the picture they produce.

I buy all the pioneer plasma tvs I can find and have them shipped to me to repair and sell. They have a good following and are easy to sell.

I have one now and it has a Sony power supply made in China. Not happy about that, but it is still a pioneer panel.

The smaller caps on these do go bad. The larger caps have been ok so far for me.

I would be looking for problems in the secondary on these supplies.

Good luck.

thanks for your post,

yes I have done a massive amount of reading ......
the service manual describes the action of the leds on the boards themselves,
if a red led lites up on the digital,video board its not the power supply....
if the orange led lites up on the power supply its a power supply problem.....
to confirm this I unpluged the x and y boards and sure enough the leds on the digital video board lite up.....
replacing the x and y plugs produced the orange led on the power supply...

I am still reading......
All the caps seem fine by look, i did try the test across the top and got good volts from the big filter caps but dropping due to the ps shutting down.

I also tried to get a volt reading from the y board where it plugs into the buffers before the power down, it gave me a slow rise to 3volts then cut out.

I am just back tracking at the moment, all the volts are turning up at the outputs but the 6.65 v seems to me (I think) to be causing it to shut down..

I will get some new caps and replace the ones you mentioned there does seem to be one that is loose ????

[confusedall]

Re: pioneer pdp505pg plasma help

I am pleased to report a little progress,with the x and y board unplugged I have turned off a switch on the digital,video board (which in the service manual says turns off all high volts and lets only the small volts thru) and the power supply stays on for a good whopping 15 secs then turns off completly (not power down) the ps board will turn back on by pressing the normal stanby/on button.

small acheivment i know ,but a change in the normal power down pattern
image 1 showing green led on dig,video board(a glimer of hope!!)hope so.

image 2 is showing two resistors 390 ohms, Ive measured these and only get 180 ohms on each is that because they are in parallel???

more help would be appreciated thanks

[confusedall]

Re: pioneer pdp505pg plasma help

i will plug x and y boards to see if this makes another change,

as soon as the caps are discharged!!!

[confusedall]

Re: pioneer pdp505pg plasma help

same result with x and y boards plugged in

any suggestions anyone

thanks

[cadiman]

Re: pioneer pdp505pg plasma help

There should be one wire (possibly) the service manual said on mine if you unplug the y and x driver boards and the power supply still shuts down It shows you how to bypass the protect mode to see if the power supply was at fault. If the power supply still shuts down then you would know it was a power supply internal fault and not an outside board.

As has been talked about here Audio boards will shut down a power supply. I have read it here and it happened to me with an fd9954 phillips/samsung plasma.

These power supplies are alot like a Nasa launch, If one thing is a little off the whole system shuts down.

Keep reading the pioneer manual in the morning when you are a bit sharper. I work on this stuff at night when I am tired (much harder). Or sometimes the brain works on it when you are sleeping and you may wake up with an idea.

[cadiman]

Re: pioneer pdp505pg plasma help

There should be one wire (possibly) the service manual said on mine if you unplug the y and x driver boards and the power supply still shuts down It shows you how to bypass the protect mode to see if the power supply was at fault. If the power supply still shuts down then you would know it was a power supply internal fault and not an outside board.

As has been talked about here Audio boards will shut down a power supply. I have read it here and it happened to me with an fd9954 phillips/samsung plasma.

These power supplies are alot like a Nasa launch, If one thing is a little off the whole system shuts down.

Keep reading the pioneer manual in the morning when you are a bit sharper. I work on this stuff at night when I am tired (much harder). Or sometimes the brain works on it when you are sleeping and you may wake up with an idea.

[confusedall]

Re: pioneer pdp505pg plasma help

thanks cadiman, i have had a break from the frustration...
Il keep reading and report any revelations