I have a Daytek tv made by LG. I get all the voltages perfect and I get green dots. I have been helped regarding this problem in other threads. This is the question I have. I have adjusted the Ysus that I just replaced. Voltages are perfect but my Vsetup is supposed to be 200v. No matter how much I adjust those I can't get 200v, it's locked in at 205v. I don't think the 5v will make a difference. Now the second problem. On the Zsus, I adjust the pot and on other tv's the pixels will change colors. Well on this one, I can turn it right down or right up and no change on the tv. Is the Zsus failing on this tv or am I missing something. The power supply has the right voltages too.
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Re: General Ysus and Zsus Question
Try reducing the Vs by 5V and adjust Set-Up/Set Dn carefully to reduce the spots....
The Vset volts being locked suggests something wrong with the DC/DC converter deriving it....
If still no good, it probably needs firmware upgrade of Control-Board.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! -
Re: General Ysus and Zsus Question
I've experienced the same as you. I've swung the Ve (equiv. to Vzbias) from 80 to 130V on a Samsung plasma, and not the slightest change to the pic!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: General Ysus and Zsus Question
Thanks guys. I'll try to lower the Vs. There also is a dip switch on the power supply. I'm not in front of it but I think it says 24v or 30v?Comment
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Re: General Ysus and Zsus Question
I wouldn't change it, chances are you could damage something on the main board.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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Hi all,
I am trying to fix my plasma TV which is not powering on due to damaged IGBTs. I have changed two igbts and 2 IC drivers on the zsus and also two igbts on the ysus.
Now everytime I plugged the ZSUS and the YSUS boards to the power board, the two 30f124 IGBT on the ZSUS are damaged and the TV stays in standby mode. When I plug the ZSUS board alone the TV turns ON but I do not see pictures. When I plug the ZSUS board without the two 30f124 IGBTs and the YSUS board, the TV powers on with a picture.
I am lost, should I change the YSUS board? Is the YSUS board damaging... -
Make and Model: LG 60PB6650-UA
Issue: Turns on, no backlight, can hear static (no channel)
I've been repairing TVs for a couple years now. I know how to use a multimeter for the most part and know how to test most components for shorts.
The power board connects to the ZSUS and then connects to the YSUS. The ZSUS is where I believe the failure is because the 16v line is only 3.8V, even when I disconnect the ZSUS from the YSUS.
This particular model seems to have a common failure with its YSUS. My goal earlier was to prove the YSUS was bad so I could... -
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... -
Hello everyone. I soldered the speakers according to the circuit diagram on the AN5277 sound amplifier microcircuit. Everything works fine (I only added a ferrite ring to remove the sound transmission interference)
But I can't adjust the sound (there is no variable resistor or something similar for this in the circuit....Please tell me how I can adjust the sound? What needs to be added to the circuit?
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