AL1916W Ab, blank screen, power indicator cycles
 

I intercepted an Acer AL1916W Ab on its way to e-waste at work. When
plugged in (with or without a video signal) the power indicator cycles
off - orange - green repeatedly over a couple of seconds. Pried open
the case (breaking half the bezel's plastic hooks, oh well) and found
that the inverter/power board had these markings on the front:

LF (manufacturer?)
ILPI-025 Rev F 2007.2.13
E131175

and these on the back

49069140010UR
barcode H790691400E00R H69E2FAK68YC 0752

I have not been able to find a circuit diagram for the ILPI-025 board
on line. There is one slightly swollen cap, a green 1000uF 10V also
marked with "GK(M)". The other electrolytic capacitors look OK. The
smaller tantalum (?) caps are blue and completely unmarked. No burn
marks or other signs of overt failure. No evident cracked solder
joints.

Not done yet: measure voltages (no circuit diagram, but will at least
be able to see if there is high voltage and +5V at the expected
places), replace the one swollen capacitor.

Anybody ever repaired one of these boards, or at least know where the
circuit diagram might be obtained?

Thanks,

David Mathog

AL1916W Ab, blank screen, power indicator cycles
 

On Sun, 14 Mar 2010 12:44:43 -0700 (PDT), David Mathog
put finger to keyboard and composed:

I intercepted an Acer AL1916W Ab on its way to e-waste at work. When
plugged in (with or without a video signal) the power indicator cycles
off - orange - green repeatedly over a couple of seconds. Pried open
the case (breaking half the bezel's plastic hooks, oh well) and found
that the inverter/power board had these markings on the front:

LF (manufacturer?)
ILPI-025 Rev F 2007.2.13
E131175

and these on the back

49069140010UR
barcode H790691400E00R H69E2FAK68YC 0752

I have not been able to find a circuit diagram for the ILPI-025 board
on line. There is one slightly swollen cap, a green 1000uF 10V also
marked with "GK(M)". The other electrolytic capacitors look OK. The
smaller tantalum (?) caps are blue and completely unmarked.

They are probably high voltage ceramics.

No burn marks or other signs of overt failure. No evident cracked solder
joints.

Not done yet: measure voltages (no circuit diagram, but will at least
be able to see if there is high voltage and +5V at the expected
places), replace the one swollen capacitor.

Anybody ever repaired one of these boards, or at least know where the
circuit diagram might be obtained?

LG, COLOR MONITOR SERVICE MANUAL, MODEL:L192WS-BNQ/SNQ. A**JQP/
A**QQP:
http://www.electronica-pt.com/index....tdown/id,4123/

Does this thread help?

AL1916W: backlight goes deed after 5s:
http://www.badcaps.net/forum/showthread.php?t=7777

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.