The common factor may be the [https://www.partselect.com/PS12740847-Samsung-DE92-03624F-ASSY-PCB-MAIN-ME19R7041FS-ME4000R-1-9-19.htm?SourceCode=20&SearchTerm=ME19R7041FS&ModelNum=ME19R7041FS&ModelID=8915995|control board]. (example only)
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The common factor may be the [link|https://www.ifixit.com/products/de92-03624f-samsung-assembly-pcb-main|control board]. (example only)
Perhaps also check for continuity between the primary door interlock and one side of the fan, the HV transformer and the door monitor interlock as the primary interlock switch is used to extend the Neutral (AC return path) whilst relays on the control board connect the AC Active. The control board AC power supply is before the door interlock switch so that the control board still works but the microwave HV circuit etc won't when the door is opened - safety feature.
Without a schematic it may be difficult but with most microwaves there are relays on the control board which are operated to supply power to the different components e.g. a fan relay, a turntable relay a power relay (which connects power to the HV components transformer, diode, capacitor, magnetron), interior light etc.
Looking at an image of the board linked above there are multiple relays seen
Normally the relays operate on an LV power supply circuit (transformer on the board) so since the clock counts down this indicates that there's LV power on the board (runs the display and clock) but this doesn't mean that the appropriate relays will be operated.
They should operate when the start button is pressed (as the clock has started to count down) so maybe the first thing to check is if there is power to the fan when the oven is started or at least prove the connection between the relay and the fan.
The 120V AC power rail is normally commoned over the relay contacts so when a relay is operated power is extended via the operated relay contact to the component.
This is all assuming that in general it is wired as most microwaves are.
As stated earlier, not easy without a schematic.
''***Be safety aware*** when working in microwave ovens. The ***HV capacitor can store >5000V DC for months*** even if the power has been disconnected from it for this length of time. ***This amount of voltage can seriously injure you.*** The HV capacitor needs ot be correctly discharged as soon as it can be accessed after the oven's cover has been removed and before any further work is done in the oven''
The common factor may be the [https://www.partselect.com/PS12740847-Samsung-DE92-03624F-ASSY-PCB-MAIN-ME19R7041FS-ME4000R-1-9-19.htm?SourceCode=20&SearchTerm=ME19R7041FS&ModelNum=ME19R7041FS&ModelID=8915995|control board]. (example only)
Perhaps also check for continuity between the primary door interlock and one side of the fan, the HV transformer and the door monitor interlock as the primary interlock switch is used to extend the Neutral (AC return path) whilst relays on the control board connect the AC Active. The control board AC power supply is before the door interlock switch so that the control board still works but the microwave HV circuit etc won't when the door is opened - safety feature.
Without a schematic it may be difficult but with most microwaves there are relays on the control board which are operated to supply power to the different components e.g. a fan relay, a turntable relay a power relay (which connects power to the HV components transformer, diode, capacitor, magnetron), interior light etc.
Looking at an image of the board linked above there are multiple relays seen
Normally the relays operate on an LV power supply circuit (transformer on the board) so since the clock counts down this indicates that there's LV power on the board (runs the display and clock) but this doesn't mean that the appropriate relays will be operated.
They should operate when the start button is pressed (as the clock has started to count down) so maybe the first thing to check is if there is power to the fan when the oven is started or at least prove the connection between the relay and the fan.
The 120V AC power rail is normally commoned over the relay contacts so when a relay is operated power is extended via the operated relay contact to the component.
This is all assuming that in general it is wired as most microwaves are.
As stated earlier, not easy without a schematic.
''***Be safety aware*** when working in microwave ovens. The ***HV capacitor can store >5000V DC for months*** even if the power has been disconnected from it for this length of time. ***This amount of voltage can seriously injure you.*** The HV capacitor needs ot be correctly discharged as soon as it can be accessed after the oven's cover has been removed and before any further work is done in the oven''
Hi @mosaabsilik,
The common factor may be the [https://www.partselect.com/PS12740847-Samsung-DE92-03624F-ASSY-PCB-MAIN-ME19R7041FS-ME4000R-1-9-19.htm?SourceCode=20&SearchTerm=ME19R7041FS&ModelNum=ME19R7041FS&ModelID=8915995|control board]. (example only)
Perhaps also check for continuity between the primary door interlock and one side of the fan, the HV transformer and the door monitor interlock as the primary interlock switch is used to extend the Neutral (AC return path) whilst relays on the control board connect the AC Active. The control board AC power supply is before the door interlock switch so that the control board still works but the microwave HV circuit etc won't when the door is opened - safety feature.
Without a schematic it may be difficult but with most microwaves there are relays on the control board which are operated to supply power to the different components e.g. a fan relay, a turntable relay a power relay (which connects power to the HV components transformer, diode, capacitor, magnetron), interior light etc.
Looking at an image of the board linked above there are multiple relays seen
Normally the relays operate on an LV power supply circuit (transformer on the board) so since the clock counts down this indicates that there's LV power on the board (runs the display and clock) but this doesn't mean that the appropriate relays will be operated.
They should operate when the start button is pressed (as the clock has started to count down) so maybe the first thing to check is if there is power to the fan when the oven is started or at least prove the connection between the relay and the fan.
The 120V AC power rail is normally commoned over the relay contacts so when a relay is operated power is extended via the operated relay contact to the component.
This is all assuming that in general it is wired as most microwaves are.
As stated earlier, not easy without a schematic.
''***Be safety aware*** when working in microwave ovens. The ***HV capacitor can store >5000V DC for months*** even if the power has been disconnected from it for this length of time. ***This amount of voltage can seriously injure you.*** The HV capacitor needs ot be correctly discharged as soon as it can be accessed after the oven's cover has been removed and before any further work is done in the oven''