LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • JDC
    Badcaps Veteran
    • May 2015
    • 273
    • USA
    #21
    Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

    One more bump.

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9604
        • Canada
        #22
        Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

        If you checked the voltages on the regulator ic's on the control board, and they are what they should be, you need a scope to check if anything else is operating, without that you would need to replace the control board.

          Comment

          • JDC
            Badcaps Veteran
            • May 2015
            • 273
            • USA
            #23
            Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

            Thanks, RJ. I'm going to look into replacing the control board before I send the YSUS out for inspection.

              Comment

              • JDC
                Badcaps Veteran
                • May 2015
                • 273
                • USA
                #24
                Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

                UPDATE: Sent the Y-Sus, Y upper, and Y lower out to a somebody on ebay (https://www.ebay.com/usr/asa.vd.pc) and they said the boards are fine. Onto the next board, probably main logic.

                  Comment

                  • wickedtuna
                    New Member
                    • Feb 2019
                    • 1
                    • usa
                    #25
                    Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

                    Originally posted by JDC
                    UPDATE: Sent the Y-Sus, Y upper, and Y lower out to a somebody on ebay (https://www.ebay.com/usr/asa.vd.pc) and they said the boards are fine. Onto the next board, probably main logic.
                    Did you ever figure out what was wrong with your TV? I have the same TV and it has just gone bad. I turn on the TV, red stand by light goes off but there is no sound or picture. I don't get a blinking light on the logic board either.

                      Comment

                      • Terzo
                        New Member
                        • Jul 2020
                        • 2
                        • US
                        #26
                        Re: LG 60PB6650 - Bad ZSUS (3.8v to YSUS instead of 16v)?

                        Hi everyone?
                        I have L.G. 60PB6900 but is with the same issue...
                        I changed Y-Sus and Z-sus, but still 18v. are not present...
                        The green light doesn’t come on...
                        Did you find a solution for that issue....

                          Comment

                          Previous 1 2 template Next

                          Related Topics

                          Collapse
                          • PlasMatt
                            LG 60PV450 Possible Bad YSUS Need help confirming Diagnosis
                            by PlasMatt
                            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...
                            09-20-2025, 06:50 PM
                          • Salvatore057
                            plasma TV Lg 42w451 - why is the zsus igbts damaged when the ysus is plugged?
                            by Salvatore057
                            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...
                            04-29-2018, 01:29 PM
                          • legg
                            LG 42PC3 buffer output doesn't follow YSUS
                            by legg
                            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
                          • Truncatedhose
                            Help repair this relic? Philips 42PF7220A/37, pulsing buzz from YSUS
                            by Truncatedhose
                            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...
                            07-04-2018, 10:59 AM
                          • divingfe
                            LG Plasma 50PA5500. Sound, no picture !!
                            by divingfe
                            Sorry if this is too repetitive, or in the wrong place.
                            I'm new, and having much the same problem. My LG50PA5500 TV has been working flawlessly since new. The other day, while in the midst of watching a broadcast DTV channel, the entire screen suddenly and silently went dark (no snaps, crackles or pops); sound, channel selection and inputs all work OK.
                            I have checked connections and voltages from: stdby, pwr supply board fuses, psb output voltages to Zsus board and its fuse, output voltages from Zsus to Ysus and its fuse. All precisely normal!! I've also checked voltages to the...
                            06-19-2021, 06:36 PM
                          • Loading...
                          • No more items.
                          Working...