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Post by you2314 on Sept 9, 2018 0:14:21 GMT -5
no still 1.4 volts
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Post by mastertech on Sept 9, 2018 9:28:11 GMT -5
Disconnect the harness at cn55 and do an ohm test between wires 3 and 4 of the harness (not the connector on the board).
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Post by you2314 on Sept 9, 2018 12:19:04 GMT -5
so i disconnected it and measued the wire going to the main power board and got 2.5 k ohm is that correct
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Post by mastertech on Sept 9, 2018 14:23:24 GMT -5
The test has to be for the front display board, not the power supply. So it depends on where you are disconnecting the harness at. If you can disconnect the harness right at cn3003 of the front display board then test right in the connector across pins 3 and 4. I want to see how much of a short there is on the display board but the harness has to be disconnected somewhere.
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Post by mastertech on Sept 9, 2018 14:29:03 GMT -5
Disconnect harness and test here:  |
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Post by you2314 on Sept 9, 2018 15:19:01 GMT -5
175k ohms
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Post by mastertech on Sept 9, 2018 16:59:51 GMT -5
Hmmm, not much of a short there. Try this. On the front display board locate and remove L3002 and reconnect the harness from cn55 to cn3003 and then recheck the voltage across pins 3 and 4 and see if it comes up to the 5.6v
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Post by you2314 on Sept 9, 2018 18:10:00 GMT -5
i am unable to find l3002. where did you find that schematic
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Post by mastertech on Sept 9, 2018 18:26:42 GMT -5
See attached image. You have to use the VSX-1020 manual in conjunction with the VSX-30 manual.  |
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Post by you2314 on Sept 9, 2018 20:11:32 GMT -5
ok it is at 5.6 volts now was testing the transistors and burned a resistor.
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Post by mastertech on Sept 9, 2018 20:26:47 GMT -5
Please be more specific. I need to know what you are doing. What transistors were you testing and why. What resistor did you burn? Did the voltage come up after you removed L3002? I cannot see what you see.
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Post by you2314 on Sept 9, 2018 20:53:38 GMT -5
after removing l3002 the voltage did come up to 5.6 so i went ahead and tested q5502 and q5504 because xdcerr measured 2.8 volts and shorted 2 pins out the resistor was r186
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Post by mastertech on Sept 9, 2018 21:00:47 GMT -5
Where is R186? What board?
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Post by you2314 on Sept 9, 2018 21:08:29 GMT -5
 on the main board |
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Post by mastertech on Sept 9, 2018 21:18:13 GMT -5
I actually found it on the schematic. Frankly I am starting to get concerned about the things that have happened during your testing process and just how much damage is being caused. I am not sure if it is worth the time to try and locate all these problems since we really dont know if more components have been damaged besides the ones you saw or know of. Generally I do not prefer that people go hunting around while were are trying to locate a specific problem and you can probably see why now.
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