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#1 |
Badcaps Veteran
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
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![]() Hi ..I need the diagram of the power supply of this monitor .. liquid leaked in it, and some parts exploded ... I did not find the exact scheme, but just something similar .. does not want to start .. thank you ..
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#2 |
Badcaps Veteran
Join Date: Jan 2016
City & State: Sochi
My Country: russia
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![]() What was the PWM U901?
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#3 |
Badcaps Veteran
Join Date: Dec 2016
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![]() I don't know exactly ... it had a hole in it ... but, I'm sure of the LD757 ... the rest couldn't be seen ... I solder the LD7575, but maybe it was the LD7576 ...
Q901 = P0765ATF D908 = 1N4148 R923 = 220 OHM R924 = 0.47 OHM I don't know the value of R915, R917, U901..the rest of the parts are OK..I didn't find an exact scheme, I tried the approximate schemes I found, but it doesn't start .. |
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#4 |
Badcaps Veteran
Join Date: Jan 2016
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![]() This is somewhat similar to your circuit.
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#5 |
Badcaps Veteran
Join Date: Dec 2016
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![]() yes .. thanks for the diagram ... the problem is that I still have resistance R915 in series with R917 and I don't know the value ... although LD7575 is compatible pin to pin with LD7576, less pin 1 (CT, RT) .. .This pin is for programming the switching frequency. By connecting a resistor to ground (LD7575), .... By connecting a
capacitor to ground (LD7576) .. here I think is the problem .. I will put a resistor with value (0) instead of R915 .. |
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#6 |
Badcaps Veteran
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![]() everything works perfectly..for LD7576 it is used in pin "1" C927 = 0.047mf, without R921, for LD7575, C927 is removed, and R921(100Kohm) is solder..R915 strap ..
Last edited by peste; 11-22-2021 at 11:26 AM.. |
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#7 |
Badcaps Veteran
Join Date: Jan 2016
City & State: Sochi
My Country: russia
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Posts: 722
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![]() So his native PWM was LD7576.
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#8 |
Badcaps Veteran
Join Date: Dec 2016
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