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cookerhood PCB Powerpoint ch581

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    cookerhood PCB Powerpoint ch581

    Hello,

    I have a Powerpoint CH581 extractor hood in the kitchen that works fine on all 3 speed settings but no longer lights the 4x12v halogen lights, I pulled out the pcb and found some parts of the board that had alot of heat but nothing I can see is fryed. There is a fuse resistor that I removed and tested, and it is fine. The nearest transformer to the light connector (connected with copper trace on the rear)has a split in the wraping, could this be the problem?





    Attached Files

    #2
    Re: cookerhood PCB Powerpoint ch581

    Took out the transformer, have resistance on the fine wire coil and OL on the heavy wire coil, I'll change it if i can find out a part number for it, no markings on the unit whatever, how do I find out what to replace it with??





    Attached Files

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      #3
      Re: cookerhood PCB Powerpoint ch581

      Is there any +12V to the bulbs?
      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.

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        #4
        Re: cookerhood PCB Powerpoint ch581

        No, no voltage to the bulbs.

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          #5
          Re: cookerhood PCB Powerpoint ch581

          Originally posted by caspermccormack View Post
          No, no voltage to the bulbs.
          with or without bulbs?
          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.

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            #6
            Re: cookerhood PCB Powerpoint ch581

            can't check, i have the board out and the hood is at my sisters 50 miles away! any way around to check it?

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              #7
              Re: cookerhood PCB Powerpoint ch581

              Originally posted by caspermccormack View Post
              can't check, i have the board out and the hood is at my sisters 50 miles away! any way around to check it?
              Without bulbs is good. I was just wondering if a bulb could be shorted and drawing too much current.

              How's the main fuse?

              Any output diodes (or is it AC output?)
              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.

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                #8
                Re: cookerhood PCB Powerpoint ch581

                Takes in 220v

                Do you think the transformer is knackered?

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                  #9
                  Re: cookerhood PCB Powerpoint ch581

                  Originally posted by caspermccormack View Post
                  Takes in 220v

                  Do you think the transformer is knackered?
                  Unlikely...

                  Does it give AC to bulbs or DC to bulbs?
                  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


                    #10
                    Re: cookerhood PCB Powerpoint ch581

                    I think it's AC, have a look at the photos you may have a better idea that me.




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                      #11
                      Re: cookerhood PCB Powerpoint ch581

                      Looks like DC. What's that black package on the board? Also, the connector looks a little discoloured... check for cold joints on 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.

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                        #12
                        Re: cookerhood PCB Powerpoint ch581

                        All the solder joints look good, The output pins to the lights look like the got hot before whatever eventually blew. This is a pic of the black box on the board, I think its a capacitor.
                        Attached Files

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                          #13
                          Re: cookerhood PCB Powerpoint ch581

                          Interesting... maybe a motor start/run cap?

                          It looks more like a normal AC transformer, in which case have you checked fuses? It could be simply o/c on one winding which is difficult to repair...
                          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


                            #14
                            Re: cookerhood PCB Powerpoint ch581

                            The black box in post #12 is a 5uF 450Volt capacitor. Common for small motors to use it. I have seen a lot of failure in ceiling 'paddle' fans, causing them to run slow even on high speed.

                            The transformer in the second post is bad. Large diameter windings, if good, should have very little resistance. OL on your meter means it's an open circuit.

                            Also, replace that discolored lamp harness connector. A bad connection will only heat up, causing more resistance, causing more heat. (thermal runaway). I have seen a lot of pin-socket failures for those 12v 50W MR-16 lamps.

                            Most manufacturers in the US have stopped using them in recessed lights and track lights due to problems with the electronic transformers and sockets. Most of the MR-16 family fixtures now use the GU-10 twist lock bases at line voltage (120)to the lamps.
                            Stupidity should be a crime, especially for drivers. I have NO patience for them.

                            Comment


                              #15
                              Re: cookerhood PCB Powerpoint ch581

                              As I said in the first post, the 3 speed settings are working fine only the lights(4x12v halogens) are not working, Switch control box lights up an LED to say they are on but nothing comes from the control board. There are no markings on the transformer so how do I know what to replace it with??

                              Comment


                                #16
                                Re: cookerhood PCB Powerpoint ch581

                                These are the bulbs


                                Attached Files

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                                  #17
                                  Re: cookerhood PCB Powerpoint ch581

                                  Originally posted by caspermccormack View Post
                                  As I said in the first post, the 3 speed settings are working fine only the lights(4x12v halogens) are not working, Switch control box lights up an LED to say they are on but nothing comes from the control board. There are no markings on the transformer so how do I know what to replace it with??
                                  You could rip apart an old wall wart or halogen lamp power supply. A 12V, 5A SMPS sells on eBay for £5 now. Replace the caps in it and you'll have a reliable ~10 year power supply.
                                  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.

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                                    #18
                                    Re: cookerhood PCB Powerpoint ch581

                                    Will i still be able to use the light switch thats on the hood to power the new power supply?

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                                      #19
                                      Re: cookerhood PCB Powerpoint ch581

                                      Originally posted by caspermccormack View Post
                                      Will i still be able to use the light switch thats on the hood to power the new power supply?
                                      If you wire it in series with the mains or lamps, yes.
                                      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


                                        #20
                                        Re: cookerhood PCB Powerpoint ch581

                                        I think the switch on the hood is a low voltage so if I replace the power supply to the lights I'll need a 230v mains switch.

                                        Also I can't see a bridge rectifier so I assume this circuit is AC????

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