I have a 50" Pioneer plasma set that will not power up for me. When plugged in, you get a solid green power light, you hear a click, then the light starts blinking and goes solid again. Nothing comes up on the screen and the fans won't spin. I opened it up to find after the light stops blinking a red LED on the power supply board comes on labeled "MAIN". The other LEDS are off. I called Pioneer and unfortunately they no longer offer the free power supply replacements for this tv. The agent I spoke to said that light does mean a power supply failure. Has anyone had any luck fixing the power supply on this tv? None of the caps appear blown on it, I'm not too sure where to go from here. Thanks!
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Re: Pioneer PDP-502MX Power problem
Post a couple of clear photos of this power supply board - front and back. I'm sure there's someone here that can help you. If it's a set that is known for that failure, I'm almost certain there's got to be someone that will chime in to help you. Also with the photo's, post any numbers on the board. That could be helpful also because sometimes these power boards are used in multiple models.
When posting pictures, use "Manage Attatchments" on the posting page.
Good luck and welcome.The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS
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Re: Pioneer PDP-502MX Power problem
I'll get some pics of the board. Hopefully someone knows something about this board, must be fairly common if pioneer started a replacement program.Comment
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Re: Pioneer PDP-502MX Power problem
I got the board out, heres some pics of it. Every time I tried to upload it as an attachment it gave me a security error, so here they are hosted off photo bucket.
Numbers on the board:
Main Power Ass'y AWZ6506
Power Supply ASS'Y 1845-A A2UL06 (stamped)
On and edge ANP1966-A
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Re: Pioneer PDP-502MX Power problem
The photos allowed here must be 2000x2000 or less. And I believe the largest photo allowed is 2MB each.Last edited by retiredcaps; 01-26-2011, 10:14 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
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Re: Pioneer PDP-502MX Power problem
Are you sure the powersupply is the problem?
What if you power up the psu alone, without connected Y-SUS and Z-SUS boards. Most of the PDP powersupplies has overload detection/shutdown, which will kick in if connected to faulty display power boards.
Have you tried to get hold of a service manual?Comment
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Re: Pioneer PDP-502MX Power problem
Please visit http://www.elektrotanya.com to find a service manual for the set.Comment
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Re: Pioneer PDP-502MX Power problem
Hi, see an old theme of this TV.
Have the same model and etc. I have all most powered on the TV but one mistake burned out more parts. So now I have a problem. Realay turns on and then turns off and repeats it all over again. It doesne't matter what is going on on the board. I removed all RCC's and all OTL's it's still doing that. Everything what is working is STB power lines. It wont start other parts of power supply. Any LED showing an error, but it's only becouse of all power supply doesn't start. In schematic there is no many parts of supply so that makes it fix harder. Maybe some ideas about that?
If you still have that board would be great if you would say some parts of it. That would be:
Q203 it's near Q201 (first main transistor) - whats written on it. Is it BS or FR?
D234 it's on RCC (little board near Q201) - it's A or A5 or what?
I'm so close to starting it. Would be great to get some help...Comment
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Re: Pioneer PDP-502MX Power problem
I have fixed this PSU before. The FET for the Vs fails short, which burns out some of the pre-charge resistors. PSU will need FET replaced and pre-charge resistors replaced. (The white ceramic ones near the mains power in.)Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Pioneer PDP-502MX Power problem
Already done that. Ceramic resistors are fine, changed one already. FET is schanged. Few days ago power supply was almost working properly.. I mean I didn't pluged the connector of Vsus and etc. it Showed an error with LED, but now it wont start at all.. The second relay RLY131 doesnt work for some reason I don't know..Comment
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Re: Pioneer PDP-502MX Power problem
Spray contact cleaner in the Vsus adjust pot, turn it a few times and try again, does it get better?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Pioneer PDP-502MX Power problem
The problem is that everything what is working is STB power no Vsus; ADR +10; +14 etc.. There is just +12 STB and +5 STBComment
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Re: Pioneer PDP-502MX Power problem
I don't know then, I have had the MAIN switch off problem before on this plasma (in fact it's still in the shed, waiting to go to the dump!!) My one however has a white bar on the screen which is plasma panel failure, so it's not economical to fix.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Pioneer PDP-502MX Power problem
So maybe you can answer this?
Q203 it's near Q201 (first main transistor) - whats written on it. Is it BS or FR?
D234 it's on RCC (little board near Q201) - it's A or A5 or what?
That would be really helpfull. On my board q203 just gon by blowing up so I dont know what was the real one.. I putted an NPN there (BS) so.. That could be a problem of not turning on maybe?Comment
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Re: Pioneer PDP-502MX Power problem
Unfortunately, I'm about 400 miles away at university!
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
Have had two Acer K272HUL monitors die with the same symptoms:
- Blue power light is illuminated while the monitor is plugged in
- Black screen (no splash screen, etc.)
- Power button doesn't do anything
Opened it up and checked for bad caps and components, evidence of burns, etc. - everything looks fine.
Power supply voltages are fine.
There are some signal lines on the power supply harness that goes from the power supply to the logic board, not sure what these should be at.
Anyone have any ideas?...12-09-2023, 10:22 PM
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