Hi all,
I have this Sharp LC-60LE810UN that stays off and blinks a Lamp Error (1 long flash followed by a short flash, in a loop).
I already confirmed that the first backlight strip has an open LED using a LED strip tester. The other 3 LED strips are fine.
Before tearing the LCD panel apart, I want to make sure that the rest of the TV set is good. I've tested the power-supply/LED inverter board by sending 5 volt to PS-ON, to PNL-POW (that commands power the T-CON board only), OFL and STB pins. The power-supply is good.
I've tried all the key combinaisons I've found in the forums and in the service/training manuals to bypass the Lamp Error mode and nothing works. The TV sets just continue to flash the Lamp Error code.
Here are the voltage measurements on the power supply board at the connectors going to the main board:
PD:
1-2: UR13.2V(Signal) : 0 volt
3-4: S13.2V(Signal) : 0 volt
5-6: GND(Audio) : 0 volt
7-8: GND(Signal) : 0 volt
9: AC-DET : 0 volt
10: PS-ON : 0 volt
11: BU5V : 5 volt
12: PNL-POW : 0 volt
LB:
1, 4, 5, 9: NC : 0 volt
2: Dimmer : 0 volt
3: GND : 0 volt
6: ERROR : 0 volt
7: OFL : 0 volt
8: STB : 0 volt
I used a DSO scope in single trigger mode and I can assure you that all the pins on the two connectors stay at 0 volt no mater what I do on the TV (disconnect then reconnect the AC cord, press all the key combinaisons both without and with the AC cord disconnect). Only BU5V has 5 volt.
Even if the defective LED strip is not repaired, you must admit that the TV set must at some time power on, even for a split second, to test the LED strips. It has no choice, it is impossible for it to detect a repaired LED strip without sending it power.
At some time I doubt about the capacitive touch keys at the front of the TV set. Using my scope I monitored the I2C communication pins (SCL and SDA) and each button has generated a signal at the main board.
I'm kind of lost on that one. I've read all the forums on the Lamp Error for the LC-40LE810UN, the LC-46LE810UN, the LC-52LE810UN and the LC-60LE810UN TV sets (even those on the 820 models) and nothing helped me to power on the TV set and get to the service menu to reset the Lamp Error counter.
I hope someone will be able to help me. Thanks in advance.
I have this Sharp LC-60LE810UN that stays off and blinks a Lamp Error (1 long flash followed by a short flash, in a loop).
I already confirmed that the first backlight strip has an open LED using a LED strip tester. The other 3 LED strips are fine.
Before tearing the LCD panel apart, I want to make sure that the rest of the TV set is good. I've tested the power-supply/LED inverter board by sending 5 volt to PS-ON, to PNL-POW (that commands power the T-CON board only), OFL and STB pins. The power-supply is good.
I've tried all the key combinaisons I've found in the forums and in the service/training manuals to bypass the Lamp Error mode and nothing works. The TV sets just continue to flash the Lamp Error code.
Here are the voltage measurements on the power supply board at the connectors going to the main board:
PD:
1-2: UR13.2V(Signal) : 0 volt
3-4: S13.2V(Signal) : 0 volt
5-6: GND(Audio) : 0 volt
7-8: GND(Signal) : 0 volt
9: AC-DET : 0 volt
10: PS-ON : 0 volt
11: BU5V : 5 volt
12: PNL-POW : 0 volt
LB:
1, 4, 5, 9: NC : 0 volt
2: Dimmer : 0 volt
3: GND : 0 volt
6: ERROR : 0 volt
7: OFL : 0 volt
8: STB : 0 volt
I used a DSO scope in single trigger mode and I can assure you that all the pins on the two connectors stay at 0 volt no mater what I do on the TV (disconnect then reconnect the AC cord, press all the key combinaisons both without and with the AC cord disconnect). Only BU5V has 5 volt.
Even if the defective LED strip is not repaired, you must admit that the TV set must at some time power on, even for a split second, to test the LED strips. It has no choice, it is impossible for it to detect a repaired LED strip without sending it power.
At some time I doubt about the capacitive touch keys at the front of the TV set. Using my scope I monitored the I2C communication pins (SCL and SDA) and each button has generated a signal at the main board.
I'm kind of lost on that one. I've read all the forums on the Lamp Error for the LC-40LE810UN, the LC-46LE810UN, the LC-52LE810UN and the LC-60LE810UN TV sets (even those on the 820 models) and nothing helped me to power on the TV set and get to the service menu to reset the Lamp Error counter.
I hope someone will be able to help me. Thanks in advance.
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