I have this Akai set. Supply voltages good. Two mylar caps were bad on supply but fixed and no change (very dim display, no sound). Most I've read says Ysus and maybe buffers bad. What are some voltages for the Ysus that I can verify? Like there are connects to the buffers with I think it was -38V/7V. Is this correct or way out of line? Can't find a schematic (LJ41-01192A).
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I have an LG plasma that after reading through a bunch of posts and doing some testing I believe has a bad YSUS board. The problem is that that doesn't make sense to me for some of the symptoms. The problem started yesterday. While watching a movie the TV just shut down like I pressed power. I have it hooked to a PC and use RS232 to turn it off and on so I thought maybe something had glitched there. I turned it back on and finished the movie with no problems. The same thing happened today so I checked logs to see if something in the control glitched and sent an off command but it didn't, After... -
LG42PC3D -UD originally with green lamp but no display or audio.
Owner says was working, then went 'pop'.
All 5V caps bulging. replaced.
All PSU output voltages within spec but -Vy is low on YSUS.
One of three parallel fets between SUS_OUT and SUS_DN is zenering,
eventually shorts DG. Replaced all 3 - -Vy now OK.
Y scan buffer test point does not follow YSUS output below -50V
Note: This unit seems to expect YSUS output to park at -Vy in between
drive signal pattern periods. A replacement drive signal board confirms this....11-18-2021, 11:49 AM -
Greetings all!
Originally this set had the usual messed up video symptoms such as: horizontal lines, weak, grainy video, bottom and top of picture differ in intensity of problem. It also seemed to slow to turn on or show the messed up picture.
Seemed like must be YScan/buffer board failure. Ordered buffer boards from my distributor which were supposed to be original/new and also from another distributor, I ordered the YSUS because I wanted to replace it for preventative maintenance. (also, the YSUS had a bulged cap, so there was even more reason to suspect it could... -
Here is the website link for this project that I plan on making
https://www.youtube.com/watch?v=atLERDZx0Q8
But I going to use a different enclosure for this project and make it more professional looking and use safety features that was not used in this video
I have some 24 volt switching power supply from my battery testing machine that I modified for a different switching power supply that is more suited for my new application and new purpose for testing BMS protection boards
If can find one that I can modify the voltage output on I have a...09-09-2024, 04:47 AM -
I decided to try a new approach to testing unbalanced battery cells with my battery testing machine that has more graph curve information and it looks like if you discharge them to 2.00 volts if the battery voltage does not come back to over 3.something volts you have some kind of issue with that battery cell
I going to do more testing and see if is the case or not
More to come later