| Electronics > Repair |
| Permanent CC and no output [Longwei K3010D] |
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| czesio666:
Vcc- goes to connector solder point named -5V. I think it is test point (the second one is 12V). Next it goes to R30/C8-. I found also that C6- is connected to the same node (the schematic is probably for older board revision). It looks like T1 with D5 D6 should produce positive 12V (this one is ok) and negative 5V? (this one is not ok). D6 is ok. Vcc- is 0,86V. But could it be due to U1 failure? |
| xavier60:
--- Quote from: czesio666 on November 19, 2019, 01:57:55 pm ---Vcc- goes to connector solder point named -5V. I think it is test point (the second one is 12V). Next it goes to R30/C8-. I found also that C6- is connected to the same node (the schematic is probably for older board revision). It looks like T1 with D5 D6 should produce positive 12V (this one is ok) and negative 5V? (this one is not ok). D6 is ok. Vcc- is 0,86V. But could it be due to U1 failure? --- End quote --- Is the winding OK? |
| czesio666:
Ok, i found it. Negative winding was not connected. Faulty joint. Resoldered and current limit disappeared. Now I will check if output is ok. |
| czesio666:
Tested with some load resistors and everything seems to be ok. The Vcc- is 4,8V. Thanks to all for help. regards |
| SirVer:
Hello czesio, I seem to be having the exact same issues as you - knobs unresponsive, fans spin up for a second, coil hum is audible. You mentioned that it turned out to be your negative winding, and I'd like to check it on mine, but I'm kind of a noob and I don't know which winding that is - could you tell me which one it is? They all look fine visually, but I can't get at all of them with a multimeter without further disassembly, so I'd like to know which one I should go at first. Thank you in advance. |
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