dakata
Junior Member
Posts: 34
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Post by dakata on Apr 28, 2018 9:00:14 GMT -5
Hi. My receiver is completly dead. No display, no std by, no power, no relay click. Main transformer is perfect. AC relay is perfect. All power and driver transistor are normal. All fuses also normal. All chips are cold (no hot elements). Service manual: elektrotanya.com/onkyo_tx-nr545.pdf/download.htmlPlease help:// Voltages P9011B: M_pwr - +11.6v 9vstb - 0v GND - GND +12VST - +11.6V SW_PWR - 0V Voltages P501B:
GND-GND +5V-0V THERM-0V Voltages on Q8961 : 2 pin - +11.6v 3 pin - +5.2v 7 pin - +5.5v |
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Post by mastertech on Apr 28, 2018 12:33:25 GMT -5
What do you have on Q7018 pins 1,3 and 5?
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dakata
Junior Member
Posts: 34
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Post by dakata on Apr 29, 2018 3:38:04 GMT -5
Voltages on Q7018:
1pin -11.6v
3pin - 5.2v
5pin- 3.3v
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Post by mastertech on Apr 29, 2018 9:57:43 GMT -5
Those voltages are not correct according to the schematic.
They should be:
1pin - 5.0v
3pin - 5.0v
5pin - 3.3v
Are you sure you are checking Q7018 on the HDMI board?
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dakata
Junior Member
Posts: 34
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Post by dakata on Apr 29, 2018 10:42:04 GMT -5
Sorry, my mystake:
Q7018:
1pin - 5v
3pin - 5v
5pin - 3.3v
Between 3pin and 4pin on Q8931 when i put DMM on diode mode, i have ''short''. When i put DMM on ohm mode, i have 30ohms.
When i measure C8936 and C8937 i have ''short'' when i put DMM on diode mode, when i put on Ohm mode i have 39 ohms.
On 2pin Q8931 i have 11.6v, on 3pin and 7 pin nothing.
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Post by mastertech on Apr 29, 2018 15:20:41 GMT -5
You do not have any voltage coming out of Q8931 because it is not being turned on by pin 7. You need to see where 3.3VNM comes from. That voltage may not come up until the unit is turned on.
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dakata
Junior Member
Posts: 34
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Post by dakata on Apr 29, 2018 15:53:06 GMT -5
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Post by mastertech on Apr 29, 2018 16:43:25 GMT -5
I don't understand from where comes this 3.3VNM...:/ Why do you not understand? |
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dakata
Junior Member
Posts: 34
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Post by dakata on Apr 30, 2018 9:53:51 GMT -5
I remove Q8931, and again i have ''short'' between 3 and 4 leg on board. I remove and C8936/C8937 again ''short''.
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Post by mastertech on Apr 30, 2018 15:01:34 GMT -5
I do not even know why you are messing with that ic. You did not even verify if it was bad. And the circuit was not verified bad yet either and you started removing stuff. You need to get the unit to turn on first. With the unit not being on that would be normal for that ic to not output any voltage. If you decide you want to get back on track and do some trouble shooting rather then just poking around let me know.  |
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dakata
Junior Member
Posts: 34
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Post by dakata on Apr 30, 2018 15:27:52 GMT -5
Ok, but i don't know how to continui.
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Post by mastertech on Apr 30, 2018 15:29:29 GMT -5
I can help you as long as you do not go removing things unless I tell you to. Can you reinstall that ic?
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dakata
Junior Member
Posts: 34
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Post by dakata on May 1, 2018 1:35:46 GMT -5
Yes, i have 10 pieces. I install back.
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dakata
Junior Member
Posts: 34
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Post by dakata on May 1, 2018 11:14:46 GMT -5
On Q7016 i have:
Emitter -GND
Base - 0v
Collector -11.6v
On Q3412:
1pin - 0v
5pin - 0v
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Post by mastertech on May 1, 2018 11:52:32 GMT -5
On Q7016 put some solder or a wire across emitter and collector so you are jumping these 2 points. Then when you plug it in see if the main relay on the power supply board clicks on. Then see if the display comes on. If you hear the click but do not have a display test for AC voltage at connector P9002 on the power supply board.
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