zerox 22" lcd psu help

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  • Th3_uN1Qu3
    Believe in
    • Jul 2010
    • 6031
    • Romania
    #21
    Re: zerox 22" lcd psu help

    Yes, but the 100uF cap has nothing to do with your issue.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

      Comment

      • swampy
        Member
        • May 2011
        • 21
        #22
        Re: zerox 22" lcd psu help

        Just replaced the main F201 fuse and the 400v cap and ive just blown the NTC201 054 ceramic cap.

          Comment

          • swampy
            Member
            • May 2011
            • 21
            #23
            Re: zerox 22" lcd psu help

            Just done some reserch and the NTC201 054 that i blew is a Thermistor im still quite new to this game.
            Now im just wondering where to go from here, what to replace it with and/or where to get a replacement from.
            How also can i tell what rating i need and how to check them as the only writing on the blown one is NTC 054.
            Cheers guys in advance
            Last edited by swampy; 06-02-2011, 05:36 AM.

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              • Th3_uN1Qu3
                Believe in
                • Jul 2010
                • 6031
                • Romania
                #24
                Re: zerox 22" lcd psu help

                Just jumper it for now, it doesn't do much except protect the mains from the spike that occurs when the primary cap is charged.

                If the thermistor blew the fuse should have too. Are you sure you used the same rating of fuse? Anyway, this indicates a short in the primary. Either the primary switching transistor or the bridge rectifier.
                Originally posted by PeteS in CA
                Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                A working TV? How boring!

                  Comment

                  • swampy
                    Member
                    • May 2011
                    • 21
                    #25
                    Re: zerox 22" lcd psu help

                    I deffinatly used the right fuse im thinking that the thermistor got damaged when it blew the first time around.
                    Im having a look through my bits and i need a 33uf 275v primary switching transistor but as of yet im only finding 22uf's and 47uf's but theres time yet.
                    Im wondering if the primary switching transistor is causing the tick, tick, tick sound?

                      Comment

                      • Th3_uN1Qu3
                        Believe in
                        • Jul 2010
                        • 6031
                        • Romania
                        #26
                        Re: zerox 22" lcd psu help

                        Originally posted by swampy
                        i need a 33uf 275v primary switching transistor
                        Um, never heard of a transistor rated in microfarads.

                        Originally posted by swampy
                        Im wondering if the primary switching transistor is causing the tick, tick, tick sound?
                        That sound indicates the transistor is working but the power supply is in protection mode. That usually happens when something's shorted in the secondary side. It could also be a bad controller startup cap so try replacing that too. It's a 50v cap, usually 10 or 22uF but can be other values, next to the SMPS controller IC.
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                          Comment

                          • swampy
                            Member
                            • May 2011
                            • 21
                            #27
                            Re: zerox 22" lcd psu help

                            I just got my fuses today and a new 100uf 400v cap and i replaced the thermistor that had blown.
                            Now my new problem is that everytime i give power to the pcb the main fuse blows? I give up the damn thing

                              Comment

                              • sabre504
                                Badcaps Veteran
                                • May 2010
                                • 449
                                • United Kingdom
                                #28
                                Re: zerox 22" lcd psu help

                                Check ZD203 on the underside of the board

                                Also check Q201 for short

                                Have had both of these go on one board which caused the fuse ,thermistor and resistor R217 to blow

                                  Comment

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