recensione e riparazione scheda gree — Transcript

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1. 0:09[Music]
2. 0:10Hi all guys and welcome to the climate inverter channel on the
3. 0:18counter we have a Green inverter outdoor unit board with the Green brand Here
4. 0:29it is recognized with this code
5. 0:35the board had a problem On this ceramic capacitor
6. 0:40shorted which we will then see where it comes from
7. 1:02in port
8. 1:08well Let's go review this board where you see these brown keys
9. 1:14and the 220 volt input where we have the filtering part Here we have the BTC a
10. 1:23relay a transformer that controls the alternating current a micro Farad capacitor
11. 1:33Concerning the inrush of the external AC fan of the capacitors that serve to stabilize the
12. 1:42300 times two Iodi bridges that are located on the back independent of each other Because
13. 1:50one is dependent on the mosfet and in turn the mosfet is dependent on the IPM while the other
14. 2:01Bridge diode will serve 300 times to rectify the 300 times on the Power supply which in turn
15. 2:13will send the switch to the transformer for the secondary Here we have various connectors
16. 2:22for the probes the PIN for communication in which we recognize the optislators who
17. 2:34always act as an intermediary on the communication the processor that controls the whole board
18. 2:44the three outputs of the IPM here we have the control of the mosfet in this section where
19. 2:55I found this ceramic capacitor the short circuit protection that has been replaced
20. 3:04In practice with this one regarding the Power supply that Here it is there eh top 2 4 3 i
21. 3:21Here we have a voltage regulator 78 05 at the outlet and 78 015 at the outlet this one here
22. 3:34we have another one than a 78 015 this one too but it feeds the
23. 3:4415 volts on the ipm while this here always a 15 Volt From power supply to the Gate in the mosfet which is
24. 3:56located below which in turn is managed by these OPT insulators which we see here which in turn
25. 4:05are managed by the microprocessor well it works which processor sends the signal
26. 4:13to the optulator which in turn time it will manage the transistors that we have here that will manage
27. 4:25the mosfet the mosfet switch will work for the ipm that we have below that this
28. 4:39PM here has the three classic outputs in which they will manage the compressor or
29. 4:51rather the revolutions of the compressor good board powered let's go do some tests let's go
30. 4:58directly to the Power we have to find the 300 times between pin 5 and pin 7
31. 5:07I recommend downloading the datasheet to do some tests on this Power so as far as I'm
32. 5:14concerned we can also take the Source tip above quietly
33. 5:24and pin n 7 we should have the 308
34. 5:30Now let's go to pin number 1 where we have the
35. 5:40Power ignition control that 5.8 volts important these two
36. 5:47resistors go to test the output that goes to this Power we have the r402
37. 6:00,1,3 times and r401
38. 6:09.2 point 5 volts
39. 6:15we can test the output of this
40. 6:18voltage regulator which is 5 times in fact 15 volts on this
41. 6:29ok and 15 on this regulator Ok on the processor we should find the three point two times
42. 6:45Ok perfect
43. 6:50Ok now let's look at the problem of this ceramic capacitor which
44. 7:01was shorted and has been replaced they are protection capacitors
45. 7:12ok I was just saying protection capacitors which has been replaced and which sends 15 times on
46. 7:22this resistor these two resistors of which the optisolator uses it to switch the
47. 7:32mosfet now I have not disassembled the mosfet I have not disassembled the transistors which then also manage the
48. 7:43mosfet But if this ceramic capacitor should stand out both the transistors and the mosfet have to be replaced
49. 7:55ok even if the mosfet by disassembling it you can do it yourself on the bench also the transistors
50. 8:03can be tested But if it should happen again Then at this point the
51. 8:10transistors and the mosfet are replaced directly I repeat you can disassemble test on the bench as regards
52. 8:17instead the photo couplers that we see here have been tested here on the bench the resistances are also ok
53. 8:29the six resistances are ok So there are only
54. 8:36two transistors left and the mosset This is the problem that has been detected on this board at the moment
55. 8:49good Let's see the outputs on the secondary we have 18 volts
56. 9:0318 volts on the diode of 405 and 18 volts on of 406
57. 9:13on d404 we have the 12 volts well fast ipm check
58. 9:24pin 1 2 3 0.2 volts 4
59. 9:343.2 volts This is the processor check pin number 5 15 volts
60. 9:46These are the signals that arrive from the processor for the control of the
61. 9:55internal mosfets of the PMs should therefore be 6 in total
62. 10:04two three
63. 10:09of these gnd
64. 10:12we return to the 15 volt
65. 10:17three other signals of the processor
66. 10:24and we can recognize from 0.02
67. 10:29we can also put in mi facing
68. 10:431.8 millivolts Ok 2 millivolts 1.9 millivolts we can also recognize them
69. 10:56in this way if among these signals these six signals that we have seen
70. 11:04do not result in millivolts Then at this point it means that the line is interrupted ok
71. 11:16As far as communication is concerned we cannot
72. 11:20see any oscillation because it is missing the internal card
73. 11:30therefore between neutral and communication we have 1.8 volts in DC But I repeat the internal card is missing but
74. 11:43we can go and check the voltage between len we obviously find the 220 volt
75. 11:52Ok but then passing these diodes and these resistances there is a drop of voltage We
76. 12:05are going to see the drop obviously we will put in DC because we have the rectification of the diodes
77. 12:13between the communication we have 134 volts where the communication
78. 12:22of the optisolators rests obviously the high voltage part is supported which we can see here 135 a
79. 12:37time at the output Ok at the input where the processor sends the signals we have one point one volt
80. 12:571.1 volts
81. 13:02Obviously this is the TX receiver and
82. 13:08insulator loop it receives And on this side instead we have
83. 13:13the 3.2 volts on this installer hop you will receive data from the indoor unit from the
84. 13:24indoor processor that will transmit because this this side is transmitter and
85. 13:33will transmit them to this processor in turn this processor receive and transmit
86. 13:42on this hop isolator which in turn will transmit data to the processor of the
87. 13:54indoor unit the optisolators split into this way the low voltage part
88. 14:02and the high voltage part on this side Ok in which they exploit a
89. 14:11higher voltage precisely to be able to transmit data at a distance and further away that is up to where
90. 14:20the processor of the internal unit is well said this Guys the video ends here
91. 14:29that's all please subscribe to the channel very important guys because
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95. 15:05the more reason to go on Ok well the memory is frying that's all I hope
96. 15:11this video was also useful A hug to all and see you in a next video