I tried to connect the power in the current state without pin32
and WOW ... monitor is ON !!!
and now I have second "little" problem
periodically the screen blinking several time for 3-5 sec
to be continued...
Ixusss
Member
Last Activity: 10-30-2015, 03:34 PM
Joined: 10-09-2015
Location: Moscow
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
I tried to connect the power in the current state without pin32
and WOW ... monitor is ON !!!
and now I have second "little" problem
periodically the screen blinking several time for 3-5 sec
to be continued... -
Re: Apple Cinema Display 23" Troubleshooting - Another Case
Unsoldering U1-pin32 show me EDID with Asset Manager and equal voltage at pins 5 and 6
5=4.81V
6=4.81V
7=4.86V
8=4.89V...Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
Spend some time for painting
I'm shure 90% cause by visible track only...Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
WOW! Thank you very much Porto. There is something to think about
From you data the chip powered with 2.75V and has 4.67V high level signal.
Are you shure in right pin direction? Pin8 is located on top-left of the chip. Confirm please?...Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
I feel that I have different chip soldered to replace
The marking was
ATML720
02B 1
A7F3178A
By the way, I don't know what they are in the specification referred to as "1" - voltage indicator
I can assume that it indicates 1.8V
I changed it to this one
ATMEL701
24C02N but may be "H"
Sl27 B
assume that the voltage shows 2.7V, although no shure
I pointed my view to frequency for 5V voltage...Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
D18 - (KL3) BAT54C -Schottky Diodes
D16, D17 - (KJE) BAV99 - Dual Surface Mount Switching Diode
DZ2, DZ3 - I cannot recognize
DZ3 - (W3) Zener Diode BZT52C3V3...Last edited by Ixusss; 10-18-2015, 01:57 AM.Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
Hello Porto,
Thank you for you attention
No, monitor is not recognized. I have the same model T-Con board LM230WU3-STC1-D11. But I don't have any shorts
I have 1.2kOhm between SCL and GND (pin 2,3 at J6 ) with T-CON connected and disconnected state.
I see a little bit strange SCL voltage 2.2V for Vcc=4.8Vcc. I think it should be less or great but I don't really sure. Do you know right voltage for U8 with no power but DVI only?...Last edited by Ixusss; 10-17-2015, 03:19 PM.Leave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
I can reproduce +24V at J2 BackLight Unit connector pin1-5 by pressing on/off button. After that +18V appeared at C16,C18 big brown caps
But BL_ON sygnal (pin12 J2) not apeared yetLeave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
For a brief moment I can see EDID information from PC with Monitor Asset Manager. At Inverter Board pin 1-5(J2) appeared 24V
I dont know how I did that but cannot reproduce effect
U8 Voltage changed
8. Vcc=4.78V
7. WP=4.75V
6. SCL=2.24V
5. SDA=4.81VLeave a comment:
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Re: Apple Cinema Display 23" Troubleshooting - Another Case
Broken U8 replaced with a new one
New EDID dump created from another working dump and [url]http://www.analogway.com/en/products/software-and-tools/aw-edid-editor/#dl[/url]
SerialNumber and Manufacture Date changed only. Reprogrammed with Arduino programmator library "extEEPROM"
But still no effect. EDID cannot be read.
I have a little bit another voltage with new 24c02H. Arduino oscilloscope show no digital sygnal at pin 5,6 only minimal DC.Re: Apple Cinema Display 23" TroubleshootingLast edited by Ixusss; 10-12-2015, 03:29 PM.Leave a comment:
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Apple Cinema Display 23" Troubleshooting - Another Case
Hello everyone!
I have a broken Apple Cinema Display 23"(Aluminium) A1082. Sumptoms Black screen and no led blinking
And wow, I have a plan to repair it ))))
If somebody can help I will be happy
Next I will describe what I did, do and will do:
1. I have a 24.5V from power adapter to mainboard input and disconnected center pin. Only +24.5V and Gnd connected.
2. I checked input from DVI(pin14) +5V. Red wire (J6) at mainboard.
3. I changed LM1117DT- 33 (VR3) w/out success Vin= 5.06V Vout=3.24V
4....Last edited by Ixusss; 10-12-2015, 03:36 AM. -
Re: Apple Cinema display 23" ... detection problem
LM230WU3-STC1 in my case...Leave a comment:
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