power supply board BN44-00438B repair

gruv2ths

Member

Join Date: Feb 2011

Posts: 13
#21

04-29-2014, 08:45 AM

Re: power supply board BN44-00438B repair

Good question, on the scope it looks oscillatory. (forgot to mention that)

The 13V at the 13V rectifier is 13V, but the 5V is the weird one at 4V. Will look at the 13V for a similar oscillation. Probably has it, the 5V and 13V come from the same converter.
Comment

Previous 1 2 template Next

Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?

by Tynan Dill

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...

7 Photos
- Channel: Troubleshooting TVs and Video Sources
11-22-2024, 01:46 PM
Panasonic switching power supply daughter board has two 27uf @ 50 volt capacitors which I do not keep in stock

by sam_sam_sam

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...
- Channel: General Electronics Technical Discussion
07-13-2024, 08:14 PM
Samsug washing machine. Power supply DC41-00189a board issue

by Soulzink

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...
- Channel: Troubleshooting Power Supplies and Power Supply Design
04-19-2025, 06:26 AM
Mitsubishi CNC switching power supply board dead / relay board bad diode failure

by sam_sam_sam

I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board

Found shorted diodes on main controller relays there are 3 of them that...
- Channel: General Electronics Technical Discussion
01-07-2023, 05:43 PM
Modification to a ZD-987 desoldering/soldering station using a external switching power supply

by sam_sam_sam

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...
- Channel: General Electronics Technical Discussion
07-01-2024, 06:34 AM
Loading...
No more items.

power supply board BN44-00438B repair

Comment

Related Topics