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Post by radiohead314 on Mar 17, 2016 8:06:44 GMT -5
C25 measures 14,35V what a coincidence???
Z50 still 0V
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Post by radiohead314 on Mar 17, 2016 8:11:04 GMT -5
There is 24,3V on 17V!
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Post by radiohead314 on Mar 17, 2016 8:11:31 GMT -5
Perhaps the c25 was a bad cap? I replaced only that one...
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Post by dummyload on Mar 17, 2016 8:12:02 GMT -5
It is the same voltage that is also used to power the tda for smps2 and so to start it. (and it's +17vm, main ground, don't confuse with the +17v )
It is also a back up supply for the pfc circuit.
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Post by dummyload on Mar 17, 2016 8:16:10 GMT -5
It 's +17vm ,mains ground (don't confuse with +17v) and it is also used to power the tda of smps2 and so +17vm present smps2 will start to .
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Post by dummyload on Mar 17, 2016 8:20:10 GMT -5
Sorry dubbel post .
Good after start up of the+17vm z50 becomes zero to disable TH1.
So now check if supply powers of and on with removing and replacing j30, when thats ok reconnect d114 and see what happens.
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Post by radiohead314 on Mar 17, 2016 8:35:41 GMT -5
Sorry dubbel post . Good after start up of the+17vm z50 becomes zero to disable TH1. So now check if supply powers of and on with removing and replacing j30, when thats ok reconnect d114 and see what happens. Ok j30 removed gives standby and replace give 24 V on 17V d114 back and some low voltage on 24V and no more squealing. should I put the old c125 back too? Perha s the new panasonic caps are bad. |
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Post by dummyload on Mar 17, 2016 8:46:20 GMT -5
Measure c25 again 14v still there j30 in place , when 14v is not present on c25 that would likely mean tda(I101) faulty or c125 but that would mean to new bad caps ??
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Post by radiohead314 on Mar 17, 2016 8:56:50 GMT -5
0V on c25 now
Replaced c125 with old one still 0V on c25
I do have a spare tda from a cine 8 supply. Perhaps the tda's I bought new are all bad.
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Post by dummyload on Mar 17, 2016 9:07:20 GMT -5
Wel it was not a good sign that you had different readings measuring them, the one before seemed to work HTHD was present ,stand by was not possible if I remember good but I don't see that can be the fault of the tda (I101).
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Post by radiohead314 on Mar 17, 2016 9:34:02 GMT -5
Wel it was not a good sign that you had different readings measuring them, the one before seemed to work HTHD was present ,stand by was not possible if I remember good but I don't see that can be the fault of the tda (I101). So perhaps replacing brings us back to the old problem? I am comparing a good tda (from cine 8) to the one I took out and indeed they measure the same. So I bought 2 broken tdas at least and one might be good just like the very first one. I will put it in as this one is clearly broken. |
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Post by radiohead314 on Mar 17, 2016 9:37:36 GMT -5
Is it possible that q101 that measures good as a npn is still broken under high voltage?
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Post by dummyload on Mar 17, 2016 10:16:35 GMT -5
There are things a simple diode test don't show , why the question?
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Post by radiohead314 on Mar 17, 2016 10:19:59 GMT -5
Never mind stupid question  He new tda new changes I turned it on and yes!!! The 17V is there no hthd led. |
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Post by radiohead314 on Mar 17, 2016 10:20:43 GMT -5
Man I bought 3 broken tdas and the one in was broken too. I am so lucky.
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