Samsung S42AX-YB04 Plasma TV stuck in standby

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK
    #21
    Re: Samsung S42AX-YB04 Plasma TV stuck in standby

    No, did any of us say that?
    Check voltage from pin 2 to pin 3. OR voltage across CB808 (one only.)
    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

      • Mikeyboy2007
        Badcaps Veteran
        • Mar 2013
        • 745
        • Scotland
        #22
        Re: Samsung S42AX-YB04 Plasma TV stuck in standby

        Originally posted by tom66
        No, did any of us say that?
        Check voltage from pin 2 to pin 3. OR voltage across CB808 (one only.)
        sorry mate :/ il check voltage across pin 2 to 3> black probe on one red on the other ?

          Comment

          • Alastair E
            Chief Womble
            • Mar 2013
            • 1963
            • U.K.
            #23
            Re: Samsung S42AX-YB04 Plasma TV stuck in standby

            No--Its not that part. You have the STD_5V
            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!

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK
                #24
                Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                The STBY is unstable though.

                Either:
                - the controller is operating in low power mode (and the ripple is normal)
                - or there's a bad startup cap, controller or other issue (and the ripple is abnormal preventing the main board starting properly)

                @mikey Yes that is how to test it.
                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

                  • Alastair E
                    Chief Womble
                    • Mar 2013
                    • 1963
                    • U.K.
                    #25
                    Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                    --No need to check the volts across CB808, that circuit is working--You have the STD_5V

                    (You checked that before--Its in yer list of voltage readings....)
                    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!

                      Comment

                      • Mikeyboy2007
                        Badcaps Veteran
                        • Mar 2013
                        • 745
                        • Scotland
                        #26
                        Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                        Originally posted by Alastair E
                        No--Its not that part. You have the STD_5V
                        yeah mate i had the STD5v leading to the Av board but there was no cable in the STD5v leading to the control board

                          Comment

                          • Alastair E
                            Chief Womble
                            • Mar 2013
                            • 1963
                            • U.K.
                            #27
                            Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                            Allegedly--that voltage is varying by only 0.1V--which could have been a user-made error by poor connection of meter probe....
                            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!

                              Comment

                              • Mikeyboy2007
                                Badcaps Veteran
                                • Mar 2013
                                • 745
                                • Scotland
                                #28
                                Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                ok i will now test pin 2 to 3 on the 7 legged chip. how do i know which pin is n and 3 ? meaning there is 4 pins on 1 side and 3 on the other so would pins 2 and 3 be the one on the 3 legged side with the space in between them ?

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK
                                    #29
                                    Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                    Only need to check voltage across CB808. They're electrically the same. What was the result?
                                    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

                                      • Mikeyboy2007
                                        Badcaps Veteran
                                        • Mar 2013
                                        • 745
                                        • Scotland
                                        #30
                                        Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                        was boucing around a little, held probes straight and firm. but volatges ranged from 15.4 - 17.9

                                          Comment

                                          • tom66
                                            EVs Rule
                                            • Apr 2011
                                            • 32560
                                            • UK
                                            #31
                                            Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                            The IC requires a min 16V to start up. So it would appear to be OK, but I would be suspicious of it.

                                            I would prefer to check the supply with a 22 ohm 2W resistor to see if it regulates better under load. Any chance you can source one? Or a similar value 18~33 ohms minimum 1W (will get hot) but ideally 2W.
                                            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

                                              • Mikeyboy2007
                                                Badcaps Veteran
                                                • Mar 2013
                                                • 745
                                                • Scotland
                                                #32
                                                Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                no, i can order one from ebay though ? would these suit ?

                                                http://www.ebay.co.uk/itm/2W-Metal-F...item20ce8eebfb

                                                  Comment

                                                  • tom66
                                                    EVs Rule
                                                    • Apr 2011
                                                    • 32560
                                                    • UK
                                                    #33
                                                    Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                    That would be fine -- Maplin stock them too.
                                                    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

                                                      • Mikeyboy2007
                                                        Badcaps Veteran
                                                        • Mar 2013
                                                        • 745
                                                        • Scotland
                                                        #34
                                                        Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                        where would i put that though tom, sorry to sound like a d**khead just new to all this kinda stuff, tryin to learn too much too fast but appreciate the help. i have attached a picture of what CB808 is on the board as it looks different from a resistor >?
                                                        Attached Files

                                                          Comment

                                                          • Mikeyboy2007
                                                            Badcaps Veteran
                                                            • Mar 2013
                                                            • 745
                                                            • Scotland
                                                            #35
                                                            Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                            cant seem to find a 22 ohm 2W resistor on maplins website :/

                                                              Comment

                                                              • tom66
                                                                EVs Rule
                                                                • Apr 2011
                                                                • 32560
                                                                • UK
                                                                #36
                                                                Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                                You're putting it across the STBY voltage, not on the primary side. And not as part of a repair, because we still don't know what's wrong -- it's part of a diagnosis.

                                                                Check Maplin code W22R. (For tests only.)
                                                                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

                                                                  • Mikeyboy2007
                                                                    Badcaps Veteran
                                                                    • Mar 2013
                                                                    • 745
                                                                    • Scotland
                                                                    #37
                                                                    Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                                    W22R on maplins site returns 3 Watt Wirewound Resistor would that be correct

                                                                      Comment

                                                                      • tom66
                                                                        EVs Rule
                                                                        • Apr 2011
                                                                        • 32560
                                                                        • UK
                                                                        #38
                                                                        Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                                        Yes. Watts (power dissipation) is a more than or equal rating...
                                                                        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

                                                                          • Mikeyboy2007
                                                                            Badcaps Veteran
                                                                            • Mar 2013
                                                                            • 745
                                                                            • Scotland
                                                                            #39
                                                                            Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                                            will try get one today and give it a try, came across a guy on ebay a few months back when i had to repair a power board on a LG LCD tv, the guy also does cap repair kits for this board including start up caps so is this a common problem with these boards

                                                                              Comment

                                                                              • tom66
                                                                                EVs Rule
                                                                                • Apr 2011
                                                                                • 32560
                                                                                • UK
                                                                                #40
                                                                                Re: Samsung S42AX-YB04 Plasma TV stuck in standby

                                                                                I'm thinking that; the unsteady voltage makes me suspect that capacitor. However, I want to rule it out (or in) first.
                                                                                Last edited by tom66; 03-30-2013, 07:36 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

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