LG 42pc1d issues

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • cliff_hootarski
    Badcaps Veteran
    • Jul 2006
    • 411
    • USA
    #21
    Re: LG 42pc1d issues

    I believe I recall seeing a way to test IPM's for shorts on Coppell's TV repair blog.

    http://blog.coppelltvrepair.com/2011...s-ipm-for.html

      Comment

      • QuantumCheese
        Member
        • Jan 2012
        • 35
        • UK
        #22
        Re: LG 42pc1d issues

        Originally posted by tom66
        Jealous. Only one variac, one bench supply and two scopes .

        Set your probe to 10X and make sure probe is 600V rated. Probe the Z-drive FFC output and check if the waveform is present (set scope to 5V/div, 100ms/div.)
        Flat as a pancake. about 20V dc on it - I think we have a winner here?
        Last edited by QuantumCheese; 01-22-2012, 09:59 AM.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK
            #23
            Re: LG 42pc1d issues

            Yep, that's bad.

            Check if there is 5V DC past the SMD fuse and if there is a 15V supply check that. (I can't remember if the Z-sustain has a 15V supply; but the Y-sustain definitely does.) The 15V is generated from the 5V input, I think.
            Last edited by tom66; 01-22-2012, 10:53 AM.
            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

              • brogdan
                Member
                • Jan 2013
                • 18
                • Romania
                #24
                Re: LG 42pc1d issues

                hello

                i also have a problem with a LG 42PC1D
                it came with blown fuse and shorted hybrid on ysus

                i changed the hybrid and the fuse, all power supply voltages are ok, but still no image.
                do you have any ideea?
                \i saw that on the mainboard(digital) there are some LEDs: L300 is off and L500-503 are on

                  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
                  • 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
                  • Sus256
                    HISENSE 65E7KQ PRO - no boot
                    by Sus256
                    Hi all!

                    HISENSE 65E7KQ PRO
                    RSAG7.820.13512 - chassis
                    MT9618BAATAB - cpu
                    RSAG7.820.12059 - power
                    HD650Y3U77 - panel
                    KLM8G1GETF - emmc

                    The TV does not turn on, the standby indicator is on. All voltages are present.
                    Emms is dead. Not readable, not detected.
                    Replaced emmc.
                    But with another dump there is no launch

                    Terminal log

                    UART
                    <
                    AC_ON
                    RPMB key is not yet programmed

                    HASH1_VERSION=0x00000000 64bit
                    E-B
                    FDE enabled
                    layout pattern onebin by SAR7,0...
                    06-01-2025, 02:11 AM
                  • howardc64
                    TCL 55S425 few horizontal lines, potential failure on both side of panel/buffer board
                    by howardc64
                    All left and right refers to looking from rear of TV (or looking from front with TV upside down)
                    • TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
                    • Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
                    ...
                    07-24-2025, 05:17 PM
                  • SoulFreeze
                    Audio Issues - Realtek ALC3306 - Lenovo Slim Pro 7 14ARP8 - Type 83AX
                    by SoulFreeze
                    Hi, trying to troubleshoot some problems with this laptop I just finished repairing which had power issues (Burnt Buck converter - SY8883DFC shorted to ground).

                    After repairing the above issue, I realized the following remaining problem,
                    Sound only comes from bottom speakers, top palmrest speakers don't work. Neither does the headphone jack (static/buzzing).
                    The computer recognizes headphones are connected and displays a popup in windows
                    Sometimes, the computer will boot up and the sound will be working fine. However, if I run intensive programs and the computer...
                    06-21-2025, 09:53 AM
                  • Loading...
                  • No more items.
                  Working...