Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Computer Displays
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 11-14-2021, 09:47 AM   #1
peste
Badcaps Veteran
 
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
I'm a: Knowledge Seeker
Posts: 5,859
Default Hp elitedisplay e231 monitor

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 ..
Attached Images
File Type: jpg IMG_20211114_172951_437.jpg (701.6 KB, 19 views)
File Type: jpg IMG_20211114_173006_374.jpg (755.7 KB, 19 views)
peste is online now   Reply With Quote
Old 11-14-2021, 03:51 PM   #2
lotas
Badcaps Veteran
 
Join Date: Jan 2016
City & State: Sochi
My Country: russia
I'm a: Knowledge Seeker
Posts: 722
Default Re: Hp elitedisplay e231 monitor

What was the PWM U901?
lotas is offline   Reply With Quote
Old 11-15-2021, 01:32 AM   #3
peste
Badcaps Veteran
 
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
I'm a: Knowledge Seeker
Posts: 5,859
Default Re: Hp elitedisplay e231 monitor

Quote:
Originally Posted by lotas View Post
What was the PWM U901?
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 ..
peste is online now   Reply With Quote
Old 11-18-2021, 06:35 PM   #4
lotas
Badcaps Veteran
 
Join Date: Jan 2016
City & State: Sochi
My Country: russia
I'm a: Knowledge Seeker
Posts: 722
Default Re: Hp elitedisplay e231 monitor

This is somewhat similar to your circuit.
Attached Images
File Type: png LD7576.PNG (151.8 KB, 16 views)
lotas is offline   Reply With Quote
Old 11-20-2021, 02:14 AM   #5
peste
Badcaps Veteran
 
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
I'm a: Knowledge Seeker
Posts: 5,859
Default Re: Hp elitedisplay e231 monitor

Quote:
Originally Posted by lotas View Post
This is somewhat similar to your circuit.
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 ..
peste is online now   Reply With Quote
Old 11-22-2021, 11:24 AM   #6
peste
Badcaps Veteran
 
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
I'm a: Knowledge Seeker
Posts: 5,859
Default Re: Hp elitedisplay e231 monitor

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..
peste is online now   Reply With Quote
Old 11-22-2021, 11:33 AM   #7
lotas
Badcaps Veteran
 
Join Date: Jan 2016
City & State: Sochi
My Country: russia
I'm a: Knowledge Seeker
Posts: 722
Default Re: Hp elitedisplay e231 monitor

So his native PWM was LD7576.
lotas is offline   Reply With Quote
Old 11-23-2021, 07:42 AM   #8
peste
Badcaps Veteran
 
Join Date: Dec 2016
City & State: CAMPINA
My Country: ROMANIA
I'm a: Knowledge Seeker
Posts: 5,859
Default Re: Hp elitedisplay e231 monitor

Quote:
Originally Posted by lotas View Post
So his native PWM was LD7576.
Yes..
peste is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 04:58 AM.
Did you find this forum helpful?