Mains power on the front panel red LED comes on solid then slowly 'flashes' about 80 times, (more like it slowly dims out and brightens back up), then goes back to solid red.
Bring out of stby the red led flashes 3 times quickly then goes out, the 'Philips' front panel display sign lights up.
Get sound and can change source etc... there is a picture visible with a flashlight.
The backlight does NOT light up nor does it briefly light up before going out. This is when viewing from the front and from the rear with the back cover removed.
Voltage readings as follows with reference to chassis gnd: (<<in stby>>, <<On>>)
BL_Off/On (0v , 3.1v)
3D_On (0v , 0v)
gnd
gnd
+12_A (0v, 11.7v)
+12 (0v , 11.7v)
+12 (0v , 11.7v)
+5/+3.5v (3.5v , 3.5v)
DIM (0v , 1.4v)
PS-ON (0v , 3.3v)
gnd
gnd
+12v_A (0v , 11.7v)
+12v (0v , 11.7v)
+12v (0v, 11.7v)
+5v/+3.5v (3.5v, 3.5v)
With LED's connected or disconnected both +VLED pins rise to 75v, settle down to 72v, 5-10secs later ramps up to 102v then gradually drops out to zero.
Both -VLED1 and -VLED2 read 0v when LED's connected or disconnected.
I think its looking like open circuit LED's but just wanted to be sure I am not missing anything before proceeding with the onerous task of disassembling the display panel.
Photos of Panel details and LED driver/PS board.
Bring out of stby the red led flashes 3 times quickly then goes out, the 'Philips' front panel display sign lights up.
Get sound and can change source etc... there is a picture visible with a flashlight.
The backlight does NOT light up nor does it briefly light up before going out. This is when viewing from the front and from the rear with the back cover removed.
Voltage readings as follows with reference to chassis gnd: (<<in stby>>, <<On>>)
BL_Off/On (0v , 3.1v)
3D_On (0v , 0v)
gnd
gnd
+12_A (0v, 11.7v)
+12 (0v , 11.7v)
+12 (0v , 11.7v)
+5/+3.5v (3.5v , 3.5v)
DIM (0v , 1.4v)
PS-ON (0v , 3.3v)
gnd
gnd
+12v_A (0v , 11.7v)
+12v (0v , 11.7v)
+12v (0v, 11.7v)
+5v/+3.5v (3.5v, 3.5v)
With LED's connected or disconnected both +VLED pins rise to 75v, settle down to 72v, 5-10secs later ramps up to 102v then gradually drops out to zero.
Both -VLED1 and -VLED2 read 0v when LED's connected or disconnected.
I think its looking like open circuit LED's but just wanted to be sure I am not missing anything before proceeding with the onerous task of disassembling the display panel.
Photos of Panel details and LED driver/PS board.
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