I have a hitachi(pioneer) pdu50wx2a plasma I have tried to find schematics for the tv under both names and I do find them, but they don`t show the power supply. These boards were a class action lawsuit for pioneer. The new board is an axx 1064 the old board was an axy 1059. I replaced the mosfets and a .1ohm fuse resister. I was missing a few of the low voltages after repair. This is a double printed curcuit board, It should be an easy fix for me, but I have never felt so dumb. These board all have the same problem so if I fix one, I fix them all. I don`t understand the curcuit layout yet. All the caps are the good stuff and seem to test ok using my dvm (none shorted or open) and do charge up. This board lasted a long time (2003) for a faulty board. If I had a real service manual I would have been hanging this thing on my wall by now! I can buy a board on ebay, but I can`t sleep until I fix this thing! I should have stayed in college longer.
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Re: hitachi/pioneer 50" plasma power supply
As always, pictures help. These board are a pain to work on. There are multiple supplies, and they are interconnected so they start up either in sequence or within a certain time of one another.Originally posted by cadiman
In general, there are three stages to these supplies. There is the PFC front end; there are several interconnected regulators generating with both regulated outputs and unregulated voltages, then there smaller DC-DC converters running off the unregulated voltages.
The way I would approach it is to first figure out which transformer is responsible for the missing voltages. Next, is it a problem on the primary side of the transformer, or is it a problem with the one of the regulated or unregulated outputs? If it is on the primary side, is it being 'locked out' by the control from another regulator, or is the SMPS itself defective.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic. -
Re: hitachi/pioneer 50" plasma power supply
If this had a recall/service bulletin, that board is *defective by design*. Replace it.
There is a fault built into the circuit board taken together that caused parts to fail more than usual. You're lucky that happened much later.
There are no schematics at all for plasma sets. Board replacement level.
Cheers, WizardComment
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Re: hitachi/pioneer 50" plasma power supply
I was waiting for the two of you to step in with your comments! Where should I send the party trays? Past experience has shown me that food gets alot of smiles as well as information and yes I am italian! Food is as important to me as electronics. I feel a little smarter so thanks! I knew I was in over my head.Comment
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Re: hitachi/pioneer 50" plasma power supply
I found an axx1064 updated power supply on ebay for 200 bucks. I now have an 8 year old plasma on my wall. This pdp is very bright even with the settings at 50% with no screen burn to be seen anywhere. The sound is great too.Comment
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Re: hitachi/pioneer 50" plasma power supply
Well I got PDP-433CMX in a package deal; when i first opened it; i saw the ymain had 2 swollen caps; found a good ymain locally for $15 so put it in... went to fire it back up... nada same 5 blinking light crack it back open start doing tests on the power supply dead as a rock not a click buzz nothing but a red light on it steady...
Now is when it gets interesting; after seeing these boards are hard and pricey to get i began to try and test out the board... as bill said i found that there is multiple ground circuits real pain to work with trying to find a short... which is what i ended up finding... this power supply has a short across the ground and the 6.5v CH2 test lead -all test done with board off aluminum tray and on bench- going along the circuit i find that the caps along it on the negative side are all shorting on the 6.5v leg... later i found the R371 is open; doesnt look burnt or bad at all but its surely isnt passing anything so i jumpered it for testing sakes and low and behold the 15v leg now shorts to ground too...
I read a russian site on this board but they speak of R133 blowing up and a batch of transistors and resistors in the Q120 area and the D145 areas but my board has none of these blown or shorted -at least not shorted across the component itself- as far as i can test or see... the copper heat sink on DU106 shorts to 6.5v and now with the jumper across R371 15v shorts too...
Without a schematic diagram or test probe location values this board is a nightmare to reverse engineer... any ideas..? im leaning towards a bad transformer; what else could open R371 and cause 6.5v to short to ground..?Comment
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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 did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
Hi everyone,
I am trying to fix a samsung washinmachine power supply main board.
I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
The power supply board reference is the following: DC41-00189a
I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Hey everyone,
This power supply board is hard to find but there are repair kits available. This board had a blown fuse, FP801S, blown PFC MOSFET, QP802CS and ceramic cap, CP809. I replaced them with parts I already had and tested the rest of the parts that would've come in the repair kit and they were fine. I powered the board up on the bench expecting, in typical Samsung power supply board fashion, to see all my output voltages but, nothing. 0 volts on CNL801, CNM801 and CNT801. The only thing I have is 170vdc on the filter caps. No standby voltage either.
Anybody...
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