Hi,
I have a LG 49UB850V
Power PCB EAX65613901 (1.6)
Main Board EAX65684604 (1.0)
symptoms are:
Standby light illuminates when power connected but when Power button pressed, Standby goes off but no sound or picture.
Previous owner said it just went off whilst watching it and wouldnt power on again.
Check Backlights (side lit) and all good.
Power board flashes LED LD701 five times in sequence. - searches seem to indicate this is a fault with DRV signal from?
Voltages all look good from PSU, can see 3.5V, 12V and 24V on C28 (from PB > MB).
PWR_ON changes from 0 to 3.5V
PDIM1, PDIM2 and DRV_ON do not change - they stay at 0v.
it would look like a MB fault.
removed wifi module
tried holding SW1901 at power on, and after for long period.
i have tried freeze spray on IC1901 (SPI) - no change
checked pin 8 on IC1901 has stable 3.5v
USB port has stable 5v
no optical port RED light at all at any stage.
checked for shorts on Caps and Coils.
what else can i check on MB ?
I have a LG 49UB850V
Power PCB EAX65613901 (1.6)
Main Board EAX65684604 (1.0)
symptoms are:
Standby light illuminates when power connected but when Power button pressed, Standby goes off but no sound or picture.
Previous owner said it just went off whilst watching it and wouldnt power on again.
Check Backlights (side lit) and all good.
Power board flashes LED LD701 five times in sequence. - searches seem to indicate this is a fault with DRV signal from?
Voltages all look good from PSU, can see 3.5V, 12V and 24V on C28 (from PB > MB).
PWR_ON changes from 0 to 3.5V
PDIM1, PDIM2 and DRV_ON do not change - they stay at 0v.
it would look like a MB fault.
removed wifi module
tried holding SW1901 at power on, and after for long period.
i have tried freeze spray on IC1901 (SPI) - no change
checked pin 8 on IC1901 has stable 3.5v
USB port has stable 5v
no optical port RED light at all at any stage.
checked for shorts on Caps and Coils.
what else can i check on MB ?
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