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Post by dummyload on Mar 16, 2016 10:04:17 GMT -5
Losen one side of d114 (disconecting I101) and test again with j30 in place measure voltage on c25 again.
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Post by dummyload on Mar 16, 2016 14:22:33 GMT -5
Did same test myself only pcf and smps present j30 present and this came out smps I1 (fix voltages) can not operate correctly (makes squealing sound) without a load ,+17v was at 22v only for few seconds (time to discharge the 325v on caps in pcf) So I put all the boards back in chasis except from eht ,horizontal ,neck boards and the whole tray,this is enough for save operation ,smps test +18v measured. Inserted smps2 and seems to work normaly to test point M100= 27v (+conv) M200= 34v but don't find it back on schematics for the moment. |
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Post by radiohead314 on Mar 16, 2016 14:43:13 GMT -5
Did same test myself only pcf and smps present j30 present and this came out smps I1 (fix voltages) can not operate correctly (makes squealing sound) without a load ,+17v was at 22v only for few seconds (time to discharge the 325v on caps in pcf) So I put all the boards back in chasis except from eht ,horizontal ,neck boards and the whole tray,this is enough for save operation ,smps test +18v measured. Inserted smps2 and seems to work normaly to test point M100= 27v (+conv) M200= 34v but don't find it back on schematics for the moment. Yes the squealing sound I heared to with a good SMPS. Ok I found that SMPS2 and horizontal where needed as a minimum. Also In my case the PFC is probable ok because with a good SMPS everything worked. Tomorrow I check the pfc to be sure. I can check th1 with the diode tester. thanks for helping! |
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Post by dummyload on Mar 16, 2016 15:16:01 GMT -5
Wel I would except the horizontal for now because you might have a problem there that made the HTHD blow in the first place.
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Post by radiohead314 on Mar 16, 2016 15:35:53 GMT -5
Wel I would except the horizontal for now because you might have a problem there that made the HTHD blow in the first place. Yes and the SMPS2 was damaged by the SMPS so that one is not save too. I figured that first we should get the squealing. After that we have to figure how to safely proceed. I will losen the diode to I101 as you suggested. |
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Post by radiohead314 on Mar 17, 2016 3:18:55 GMT -5
I wonder if desoldering the fuses on the secondary side would stop the squealing?
With hthd there is no fuse but it is loaded on the secondary board.
Or a resistor across the caps? 1k?
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Post by radiohead314 on Mar 17, 2016 5:02:57 GMT -5
If it's really 370v that should mean the pcf is on normaly only possible through the controller power supply on/off output are with jumper j11 on the pcf board? j30 in place must activate TH1 which should put a supply voltage on c25 and c125 so both tda's can start up (nothing can happen if the tda don't get there supply c25,c125). So there seems to be something wrong there. TH1 rectivies the mains through ptc1 and ptc2 and sr1 on the pcf board check those resistors. sr1 is 1.5k that is the vallue written on the component too but the schematic says 270. ptc1 and ptc2 3,2k i measure 360V on Q101 collector and on c50 with and without j30 on subboard j11 I can not find -> found it j11 is off strange that I used to measure 325V |
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Post by dummyload on Mar 17, 2016 5:06:35 GMT -5
Just put some boards back ,is there a reason to presume the fix voltage part generated by I1 are at fault ,did you do any work ,replace components in that section?
Or if you can start it whithout extra boards just for a few seconds to measure +17v it should be around 22v (whithout load) you can assume it works correctly and then add extra boards and measure again if its between 17v and 18,5v you are fine.
I would like to know if voltage comes on c25 with d114 disconnected.
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Post by dummyload on Mar 17, 2016 5:12:53 GMT -5
Try an other meter or check battery , I have a meter that start showing of values when battery becomes to low. (you use the correct ground ,not chasis)
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Post by radiohead314 on Mar 17, 2016 5:18:22 GMT -5
Just put some boards back ,is there a reason to presume the fix voltage part generated by I1 are at fault ,did you do any work ,replace components in that section? Or if you can start it whithout extra boards just for a few seconds to measure +17v it should be around 22v (whithout load) you can assume it works correctly and then add extra boards and measure again if its between 17v and 18,5v you are fine. I would like to know if voltage comes on c25 with d114 disconnected. Ok I try just a few seconds for now. I only replaced C25 with a low esr one but checked it many times so little work on I1. I will remove D114 next. This is a picture how I measure the voltages. Mostly directly over the component. With Q101 I take the ground from the heatsinc screw.  Untitled by Radio Head, on Flickr |
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Post by radiohead314 on Mar 17, 2016 5:29:56 GMT -5
Try an other meter or check battery , I have a meter that start showing of values when battery becomes to low. (you use the correct ground ,not chasis) You are good! Look at that, the battery was low on the other meter.  Untitled by Radio Head, on Flickr |
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Post by dummyload on Mar 17, 2016 5:38:39 GMT -5
It doesn't made sens that the pfc would be on so.
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Post by radiohead314 on Mar 17, 2016 5:53:23 GMT -5
I would like to know if voltage comes on c25 with d114 disconnected. Ok this is strange. With d114 disconnected I hear caps squealing but the voltage on C25 is 0V. I double checked everything. -Jumper j30 on subboard -standby led burns only |
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Post by dummyload on Mar 17, 2016 5:56:29 GMT -5
Measure if +17v is present .
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Post by radiohead314 on Mar 17, 2016 6:00:24 GMT -5
Measure if +17v is present . No something like 1.14V I am measuring 17V on the secondary side. There is also a 17V on the primary side I could measure? |
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