Hi guys
I got this tv that won't turn on
Problem is next: when plugged in stdby led is on, but when try to turn it on with remote led blinks and apparently it turns on but there's nothing on screen, neither there is samsung chime. I can see that set is responding on remote commands because led is blinking when some of keys is applied.
Measured voltages on PS and they are all present when interconnect cable between PS and MB is disconnected (backlight turns on too, so that's not the problem).
When MB connected this goes bad: E_PWM (5V) goes to 1.77V, 5V_DET goes to 0 and INV_ON (3.3V) goes to 0. Other voltages (5.1V, 13V, PS) are ok in both ways (with cable connected or disconnected). Tried disconnecting t-con to isolate it but it didn't change anything so i assume problem is somwhere on MB.
Checked voltage regulators:
IC 2001 (1117-33): 0 3.3 5.23
IC 2004 (1117): 0.62 1.87 3.28
IC 2005 (78M09A): 12.9 0 8.87
IC 5003 (1117): 3.72 4.96 8.85
They appear ok?
Resistance on 5V_DET to GND is 0.88kohm, but without schematic hard to check it is it right
MB code is BN41-01165A or BN94-03132P, but unfortunately couldnt find schematic for it...
Could it be that BGA CPU is causing this voltages to go that bad?
On pictures cables are loose, i just put them to take pictures, measurements are taken with properly seated cables
I got this tv that won't turn on
Problem is next: when plugged in stdby led is on, but when try to turn it on with remote led blinks and apparently it turns on but there's nothing on screen, neither there is samsung chime. I can see that set is responding on remote commands because led is blinking when some of keys is applied.
Measured voltages on PS and they are all present when interconnect cable between PS and MB is disconnected (backlight turns on too, so that's not the problem).
When MB connected this goes bad: E_PWM (5V) goes to 1.77V, 5V_DET goes to 0 and INV_ON (3.3V) goes to 0. Other voltages (5.1V, 13V, PS) are ok in both ways (with cable connected or disconnected). Tried disconnecting t-con to isolate it but it didn't change anything so i assume problem is somwhere on MB.
Checked voltage regulators:
IC 2001 (1117-33): 0 3.3 5.23
IC 2004 (1117): 0.62 1.87 3.28
IC 2005 (78M09A): 12.9 0 8.87
IC 5003 (1117): 3.72 4.96 8.85
They appear ok?
Resistance on 5V_DET to GND is 0.88kohm, but without schematic hard to check it is it right
MB code is BN41-01165A or BN94-03132P, but unfortunately couldnt find schematic for it...
Could it be that BGA CPU is causing this voltages to go that bad?
On pictures cables are loose, i just put them to take pictures, measurements are taken with properly seated cables
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