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O General 2 Ton Outdoor Inverter Ac Pcb Communication Repairing | Split Air Conditioner Pcb Fix - YouTube
Channel: Forever Tech
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Assalam O Alaikum friends I am Nadeem Robin and you are watching your own channel Forever Tech
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so friends lets talk about the another PCB that has come for repairing
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so today we have O General Dc Inverter Ac and I am going to describe it completely
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that what things are installed in it
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and what functions are in it
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and how does it works
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but today as you can see
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I have the same model here for repairing
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this PCB is in working condition but there is some fault in it
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but this PCB is totally dead
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and in this PCB there is serial ccommunication error
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which means that two blinks are shown in the indoor PCB
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and it is not in working condition
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now we will turn it on and show you that it is not working at all
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and except this what you have to repair and how can you do it so lets give you the complete demonistration
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as you can see
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now we will give the electric supply to the PCB
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and then we will check what is the fault that its turning on or not
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but let me tell you one thing over here
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as you can see it is same PCB of same model
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but here are two reactors connected in it
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and the reactor in bigger size is not connected over here
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so that's why we will give direct electric and then check it
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And in our next video we will tell that how these reactors can work and why doubles reactors are installed here
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and now we will give the electric supply
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but give the electric supply properly there should be no mistake
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as you can see the N is for neutral and this white wire is neutral
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and this black wire is for line as you can see
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as properly is written over here
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and third one is for communication
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and except this its wiring for this we have already uploaded the video related to it
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if you haven't watched it yet so you must watch to get benefited from it
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and then you will learn that how can you do this
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and now we will give the electric supply
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then we will check it properly that it is doing switching or not
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now we have install the electric
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as you can see that there is no kind of switching over here because it switched till this time
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so we will plug the wire out
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now we will open it and check out what is the fault in it
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and properly check that from where to start and end
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as you can see we have opened the unit
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but first we will test it physically
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that is something damage or burned in it or something short circuit
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if we see this side I haven't cleaned it yet
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but here I haven't seen any problem yet
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but as you can see
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at this side
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some repairing has done already
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it means that someone has done some wor over here
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and if I see at this side so earlier someone has done the work
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as someone has done work
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this is the PTC sensor and some work is done on it as well
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and except this as you can see
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let me zoom in
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there is some problem with its fan
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and you can see its print has faded out
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so it means that someone has already done work over it
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but it doesn't matter let some work done by us as well
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and lets see what will be its results
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here now we have checked it physically
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as we have sought out a minute problem
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but beside this we are going to check it properly
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because it is completely dead
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for testing the dead PCB the first point we have to check
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is there fuses
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as it is very important to check the fuses
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we have set the meter on continuity mode
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and then on contunuity mode we will check its fuses
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as you can see contunuity mode
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and its absolutely working
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and as we have checked the sub fuse
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and as you can see this is main fuse
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Main fuse 20 amperes
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and 5 amperes fuse is installed here
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after this the PTC sensor
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and after this as you can see a transformer type thing is attached here
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and soon about this I will make a video and tell you about its functions
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it has a very important function
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because it is present in some units and in some it is not
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and if in some units it is present so you should know that for what reason it is installed here
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so lets proceed further and lets test these things
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now here we will rotate the PCB
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after rotating
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and if we check the position
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as you can see here it is written CT1 and then R1
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now we will test these both
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as you can see we have kept meter over here
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so lets check it
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there should be some ohms given on testing
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and here we get some ohms
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as you can see 0.7 ohms are given
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and except this if we check its PTC sensor
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so we should get the values of ohms upto 43,45, 50, 60
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and as you can see here we get 43.6 value of ohms
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which means that the PTC sensor is absolutely fine
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as you can change the polarity as well
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so the value should be same
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and it is showing its proper position
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and after testing it
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and after this what you have to do is to check its line reactor
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and reactors are attached over here as well
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then check these reactors
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and I hope you know that how to check the reactors
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How to test the reactors I have already upload a video related to this
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but here are two reactors so for this you can use the same procedure
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and now here
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after testing these things what you have to do is
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to check its rectification
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and how can you check the rectification so for this what 's the procedure
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so set the multi meter on the diode mode
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and then test it on the diode mode
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keep the positive side at any end and negative on other and then start to test
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as you can see the meter is giving some voltages for a while and then they diappeared
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it means that this position is absolutely correct
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and after this there should be no value at any point
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if you test it againso ther should be no value
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at any point as you can see
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and after this change its probes
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and after changing its probes we will check it
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there should be some values given by the meter
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as you can see the value given is 0.941 volts which means it is absolutely fine
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5.20 volts and 5.0 volts
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and the values should be same
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so this rectifier is absolutely fine
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and there is no problem
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after this we will check its IGBTs
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so for checking IGBT test it at any point
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and at this place it is absolutely correct
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at this place the value should not be zero ,zero
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and if it is common so that doesn't matter
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and if it is not common so the value should not be zero
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and here at this point nothing is common
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and you can see we are checking it at each point
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as you can see
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and it should not show any kind of problem here
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as you can see it is absolutely fine
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and it is not showing zero value at any point
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as you see these are diodes and now we will test it
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and it is blocked from one side
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and on other side we get
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0.375 volts value is shown
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and at this point it is giving the same value
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and if we change the probes so it should not give zero value
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and it should be block and it is blocked over here
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it is absolutely fine and its position is correct over here
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so lets check its IPM
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and how can you check the IPM so for this I have uploaded video related to this
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but it is a bit different
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to check different IPM you should know about its data sheet
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and except this you should know about its pin and about its position
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and if we see the pin so this pin is neutral
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and the inside one is the positive
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and after this these are U , V , W
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And like this we check it with same procedure
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and I hope you will watch that videos and then test them
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and at this side we have test its high side
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and except this we have check its IPM
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and you have to check the IPM by watching that videos
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and then according to that videos you can check the IPM
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you can check the pins through its data sheet
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and after this if the position is correct and the high side is absolutely fine
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so then you have to check its SMPS
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and except this these are capacitors
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and if these are short circuit or there is fluctuation so it can cause the same problem
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and here I have check it physically so there is no fault
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and except this we have checked it
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so you can test it in the same way as well
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and if you test it out of the system so this is more best
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lets proceed further and discuss what is the fault in it
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because high side is absolutely correct and each point seems perfect
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and except this
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when we checked its fan connector position over here
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so we founded some damage over here
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which means that there will be some problem in the fan circuit
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and the fan circuit is directly installed with the SMPS
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so its means that there would be some fault in the SMPS
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