I acquired a Philips 50 PF7321D with a LJ44-00125A power supply problem. Resistors R8006 and R8007 were open. (4.7 ohm high wattage) I replaced them and when powering up they got hot and burned up again. All the caps look good and the ones I can test are good. Anyone had this problem before or does anyone have a schematic for this power supply or where I can get a schematic for this? The board is too crowded for my old eyes to follow the traces. I could easily just order a new power supply but I don't need the TV and just wanted to see if I could remember how to troubleshoot and repair this kind of stuff.
-
-
Re: Philips 50 inch plasma power supply problem
Sounds like a shorted MOSFET on the primary side.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. -
Re: Philips 50 inch plasma power supply problem
Thanks for the reply. I had looked at that site and many others for the service manual so far no luck. The ones I have found don't have the power supply schematic??? I have pulled a few components, high current bridge, caps in the area and tested those, with the large coils and transformers taking up so much real estate hard to follow the traces. If anyone has the schematic for the above listed power supply I would be appreciate it.Comment
-
Re: Philips 50 inch plasma power supply problem
LJ44-00125A sounds like a Sammy PSU. Let me check...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
-
Re: Philips 50 inch plasma power supply problem
Samsung yes, 20060705 rev2
PS-505-PHN LJ44-00125A
Don't know if any of the other silk screen marks help?
ThanksComment
-
Re: Philips 50 inch plasma power supply problem
Just took a look.. I don't have access to Magnavox or Philips service site, and according to ShopJimmy this Samsung power supply was never used... in a Samsung, which I have access to
Comment
-
Re: Philips 50 inch plasma power supply problem
Thanks for looking, I may just end up wearing a solder sucker out following the traces....
Was poking around and read around 8 ohms across the NO contacts of a relay???RLY8001 removed it relay was good,, contact pads read about 8 ohms??? I know i could beat this if I had a drawing.... then again if i give up I'll put a wire across the resistors and follow the burned trace. I'll figure this out one way or another. LOL.Comment
-
Re: Philips 50 inch plasma power supply problem
Search Tom66 on forum because he has a list of where to get service manuals for your TVs. I read all of his advice because he a true Blue Veteran on plasma repair. scince he read your post, so he might send you the link. Randtek on the forum opening page has a link to tom66 Plasma tv library, because that is where I got mine,and it is free. I allways chose to donate money to pay for the vast supply of manual on line. Good luckComment
-
Re: Philips 50 inch plasma power supply problem
Check the MOSFETS on the big heatsinks--No need to follow traces, just check 'em all....TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
-
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... -
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... -
I have an LG Plasma TV 60PM6700 for the past ~12 years.
In the last ~3-4 months I have been having some issues.- Problem: It started with random picture disappearing (sound still worked).
Frequency: Happened about once a week.
Solution: Had to turn off TV wait a few seconds before turning it on again. - Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
Frequency: Happened about once a week.
Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve. - Problem: TV shuts down
- Problem: It started with random picture disappearing (sound still worked).
-
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... -
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...
Comment