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#101 |
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#102 | |
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#103 |
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![]() This is why I asked you to isolate pin 4 of the ic and check the voltage on just the ic pin4, This would eliminate EVERYTHING else connected to the ic.
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#104 |
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#105 |
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![]() Here is the block diagram of the ic I have no idea why you have 0 volts on pin4
Is R7918 (0Ω) open? Are these NEW ic's or used? |
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#106 | |
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Does it make sense to desolder the supervisor? Or can I just remove the resistors on pins 1 and 3? I read on other forums that it happens to be a common problem his of not give starting IC Last edited by romasik; 05-21-2022 at 05:41 PM.. |
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#107 |
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![]() What do you have in place for D7950? Maybe disconnect whatever is in there and see if the vcc comes up.
The ic's startup cell IS providing the initial 9volts, (at low current) so there can't be anything on that vcc line killing the voltage or you wouldn't have 9v. something is keeping the ic from oscillating. Last edited by R_J; 05-21-2022 at 06:43 PM.. |
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#108 | |
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#109 |
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#110 |
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![]() Have you compared all pin voltages with datasheet?
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I assume no responsibility for any stupid suggestions I might post. |
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#111 |
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#112 |
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![]() With STR-A6000. Strike that
Last edited by dskall; 05-22-2022 at 03:52 PM.. |
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#113 | |
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#114 |
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#115 |
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![]() I desolder supervisor and D7950 nothing change ((
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