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Post by mastertech on May 1, 2018 12:26:38 GMT -5
On Q3412: 1pin - 0v 5pin - 0v Normal until unit is on. You need to stop hunting around. You can cause more damage by trying to test components that do not apply to your problem. If you are still learning how to read schematics then ask questions. |
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dakata
Junior Member
Posts: 34
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Post by dakata on May 1, 2018 14:18:47 GMT -5
Thanks. After connecting emitter and collector on Q7016, relay click, but no display. I have 220volts (europe standart).
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Post by mastertech on May 1, 2018 15:33:01 GMT -5
Did you try pressing the power button when plugged in?
Have you tried doing a reset?
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dakata
Junior Member
Posts: 34
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Post by dakata on May 1, 2018 15:53:49 GMT -5
Yes. I push power button, and try combine enter+power button, but nothing.
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Post by mastertech on May 1, 2018 16:16:19 GMT -5
Did you try pushing the CBL/SAT and ON/STANDBY buttons at the same time for a reset?
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dakata
Junior Member
Posts: 34
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Post by dakata on May 2, 2018 1:09:56 GMT -5
Did you try pushing the CBL/SAT and ON/STANDBY buttons at the same time for a reset? Again nothing. |
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Post by mastertech on May 2, 2018 9:41:40 GMT -5
Remove the jumper on Q7016. Then I need you to test some voltages right on the pins of Q7009. Try not to slip with your test probe. If you need to, file the tip of your probe to a sharp point. This will help to not slip.
Give me the voltage on the following pins:
126 ____
129 ____
130 ____
138 ____
140 ____
141 ____
142 ____
143 ____
144 ____
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dakata
Junior Member
Posts: 34
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Post by dakata on May 2, 2018 12:04:39 GMT -5
Thanks. Tomorrow morning i'll check voltages, because here is night at this moment and my light is't not good in my room.
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dakata
Junior Member
Posts: 34
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Post by dakata on May 3, 2018 8:42:48 GMT -5
Voltages Q7009:
126 ____ 2.3mV
129 ____0v /on R7026 on one side I have 3.3v but on the other I have 0v (0v on side which go to 129 pin)
130 ____0v /on R7025 on one side I have 3.3v but on the other I have 0v (0v on side which go to 130 pin)
138 ____0v
140 ____0v
141 ____3.3v
142 ____3.3v
143 ____3.3v
144 ____3.3v
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Post by mastertech on May 3, 2018 13:39:49 GMT -5
Test pin 144 again and while holding your probe on there press the on/standby button and hold it. Does the voltage drop to zero. Then release the on/standby button and see if the voltage returns to 3.3v
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dakata
Junior Member
Posts: 34
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Post by dakata on May 3, 2018 14:08:50 GMT -5
Yes, when i press Power button voltages drop to 0v, and after release again 3.3v
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Post by mastertech on May 3, 2018 15:46:47 GMT -5
Test voltage on pin 74 and 14.
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dakata
Junior Member
Posts: 34
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Post by dakata on May 4, 2018 3:32:59 GMT -5
14pin - 0v (if i press power button again 0v, if i press enter+power button again 0v)
74pin - 2.98v stable (if i press power button again 2.98v)
Edit: On board R7026 (220kohms) is 419ohms??? Is is normal?
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Post by mastertech on May 4, 2018 13:34:36 GMT -5
14pin - 0v (if i press power button again 0v, if i press enter+power button again 0v) 74pin - 2.98v stable (if i press power button again 2.98v) Edit: On board R7026 (220kohms) is 419ohms??? Is is normal? If you are measuring in circuit then it may not show real value. I am not sure about those last readings you got on pins 14 and 74. I expected more closer to 12v on 74 and at least something if not close to 3.3v on 14. Can you check voltage on both sides of D7009. Also check voltage on 2 pins of Q7020. |
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dakata
Junior Member
Posts: 34
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Post by dakata on May 4, 2018 14:32:09 GMT -5
Voltages Q7020:
GND-GND
RESET-3.27V
VDD-3.27V
Voltage D7009:
4.88v - cathode
2.98v - anode
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