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

First off all Great thanks to all guys from the links below for many helpfull tips
MAC CINEMA HD Display 23 Inch by Bud Martin | Photobucket
http://ift.tt/1JMwEZ7
http://ift.tt/Os9rHf
Apple 23" Cinema Display possible fix for 'short-long-short' error | pixelchimp.net
Apple Cinema Display 23" (PCB Q49C or info about transistor)
Cinema Display Troubleshooting/Parts
But ... monitor doesn't work yet



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. I check Q1 transistor(H7XZ1). If I right understand it's P-Channel 20-V (D-S) MOSFET Si2367DS
Gate 11.1V Drain 24.5V Source 24.5V I dont know this is good or bad voltage cause I dont know how it should be

5. 2672(VR1) have only one pin powered Vin=24.5V


I attached picture with voltage at main board with some points I checked



Investigation to be continued ... join this

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