hello, i have the same issue as this thread :
https://www.badcaps.net/forum/showth...8668&styleid=8
it's a 42LW4500 LG tv, previously it had the classical L407 classical issue : desoldering due to bad resin that gave me no 24V. work great for one month
yesterday : sudenly, green light then screen shut down. white led ok
open it and test : first put a resistor between 3,5 and PWR-ON, another one between 3,5 and inv_on : tv start, backlight ok and stable.
but when the connector between motherboard and PSU is connected : i have 3,5V 12V 24V but NO INV_on, a_dim and p_dim.
if i test ic1002 at inv_ctl : got 3.5V, r421 is good and Q405 no short.
so i think my issue is due to P_dim (power dimming so)
all pins joints were resoldered
during all this tests, once the tv works for some seconds then shut down.
thank you
put here service manual .
https://www.badcaps.net/forum/showth...8668&styleid=8
it's a 42LW4500 LG tv, previously it had the classical L407 classical issue : desoldering due to bad resin that gave me no 24V. work great for one month
yesterday : sudenly, green light then screen shut down. white led ok
open it and test : first put a resistor between 3,5 and PWR-ON, another one between 3,5 and inv_on : tv start, backlight ok and stable.
but when the connector between motherboard and PSU is connected : i have 3,5V 12V 24V but NO INV_on, a_dim and p_dim.
if i test ic1002 at inv_ctl : got 3.5V, r421 is good and Q405 no short.
so i think my issue is due to P_dim (power dimming so)
all pins joints were resoldered
during all this tests, once the tv works for some seconds then shut down.
thank you
put here service manual .
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