Hello,
I have a blackscreen at booting.
I blow the double USB port at the right hand of the laptop.
I had a normal functioning PC afterward except those 2 USB ports not functioning anymore.
After opening the PC and closing it again the black screen problem started.
This is what I 've done since:
(All tests are with disconnected USB flat cable at the inside since the double USB port at right had side is not functioning anymore (my fault: I had put 12 V on USB SATA interface at a connector where 5V was inspected)).
TEST with external POWER supply and BATTERY/no KEYBOARD/no HDD connected/: RAM inserted --> Power LED OK; Charging Led OK (temporarely till fully charged; Led at Numlock: continuously ON; Ventilator ON; Caps Lock light on;
TEST without RAM inserted: LED at Video Out port: flikkers 3 times; led at Keyboard: same 3x
(ERROR=always black screen)
-Same results (LEDS) with or without laptop display connected;
- external display after alt F4 or HDMI: no signal
With HDD inserted and one stick of 512MB RAM/ no Keyboard: --> short flash of HDD-LED 3-4 secs on booting and then staying OFF; Black screen (also in dark room.)
When I then push power button ¼ of a second, Compaq powers down immediately.
I can access the HDD from a different PC over USB with SATA interface and it seems OK (I can read the files)
I have checked my MOBO; Connector 1 (display) power at pin 39/40 :19V; no power at pin 38 and +3VLCD_CON pin 1-2-3.
also checked disp_on signal: 0 V; Any ideas or advises??
(ps You find the diagram here: )
I have a blackscreen at booting.
I blow the double USB port at the right hand of the laptop.
I had a normal functioning PC afterward except those 2 USB ports not functioning anymore.
After opening the PC and closing it again the black screen problem started.
This is what I 've done since:
(All tests are with disconnected USB flat cable at the inside since the double USB port at right had side is not functioning anymore (my fault: I had put 12 V on USB SATA interface at a connector where 5V was inspected)).
TEST with external POWER supply and BATTERY/no KEYBOARD/no HDD connected/: RAM inserted --> Power LED OK; Charging Led OK (temporarely till fully charged; Led at Numlock: continuously ON; Ventilator ON; Caps Lock light on;
TEST without RAM inserted: LED at Video Out port: flikkers 3 times; led at Keyboard: same 3x
(ERROR=always black screen)
-Same results (LEDS) with or without laptop display connected;
- external display after alt F4 or HDMI: no signal
With HDD inserted and one stick of 512MB RAM/ no Keyboard: --> short flash of HDD-LED 3-4 secs on booting and then staying OFF; Black screen (also in dark room.)
When I then push power button ¼ of a second, Compaq powers down immediately.
I can access the HDD from a different PC over USB with SATA interface and it seems OK (I can read the files)
I have checked my MOBO; Connector 1 (display) power at pin 39/40 :19V; no power at pin 38 and +3VLCD_CON pin 1-2-3.
also checked disp_on signal: 0 V; Any ideas or advises??
(ps You find the diagram here: )
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