What are the causes of this situation (image inside)?

What are the causes of this situation (image inside)?

Postby batareika » Wed Oct 09, 2019 7:27 am

Good health to all!
When checking the voltage at the test points (see table), it turned out that the alternating voltage was 2 times higher than normal (resistors R13, R 14, R 15 are normal).
What can cause this phenomenon, is it dangerous to start the oscilloscope?
Thank.

Image
Motherboard: PN:109-15000-00E2
Analog board:PN: 109-15001-00F
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batareika
 
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Re: What are the causes of this situation (image inside)?

Postby batareika » Mon Nov 04, 2019 9:42 am

When I try to turn on the test signal appears (and disappears) the inscription "Doing VPos aligment..."
Motherboard: PN:109-15000-00E2
Analog board:PN: 109-15001-00F
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batareika
 
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Re: What are the causes of this situation (image inside)?

Postby phoeny » Mon Nov 04, 2019 11:08 am

check R22, V4 is ADCIN which is held to 1.65V by R21 and R22. With the analog board disconnected ADCIN on the Digitalboard should be 1.65V,
if it is your problem is with the analog board, if not its the digital board


I used this schematic
https://jyetech.com/wp-content/uploads/ ... analog.pdf
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Re: What are the causes of this situation (image inside)?

Postby batareika » Mon Nov 11, 2019 2:52 pm

phoeny wrote:check R22, V4 is ADCIN which is held to 1.65V by R21 and R22. With the analog board disconnected ADCIN on the Digitalboard should be 1.65V,
if it is your problem is with the analog board, if not its the digital board


I used this schematic
https://jyetech.com/wp-content/uploads/ ... analog.pdf


In my version of the analog board, the R22 resistor (and this whole cascade) is missing.
Motherboard: PN:109-15000-00E2
Analog board:PN: 109-15001-00F
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