Hello TV repair gods,
I am using this guide to troubleshoot which has me in the right direction, but I am stuck.
No Power/Dead Set (No RED Standby LED)
In a dead set condition there will be No RED Standby LED illumination in the Standby Mode (TV plugged into an active AC Outlet).
The following bullet list gives the possible failures for a “No Power/Dead Set” condition.
• Loss of AC Power
• Loss of AC-OFF-DET
• Loss of Standby 3.3Vdc
• Loss of REG12V
• Loss of Power-On
• Defective Main Microprocessor
The first step in troubleshooting a “No Power/Dead Set” condition is to confirm that 110ACV power from an active AC outlet is applied to the G2LE-Board, G2LE-Baord, or GD2-Board. AC power is applied to, and can be measured at CN6101 on the G2BE-Board or G2CE-Board and at CN6003 on the GD2-Board.
Next, check for the presence of the AC-OFF-DET voltage at CN6401/pin 2 or CN6150/pin 2. If the AC-OFF-DET circuit is working properly 3V should be measured. If the 3V is not present replace the G2BE-Board, G2CE-Board, or GD2-Board. If the 3V in not present either the main fuse or the main power supply IC6501 is defective. In either case, replace the power supply board.
After confirming the AC power and AC-OFF-DET, check for a defective Standby 3.3Vdc power supply IC6201. To confirm a defective IC6201 check the 3.3V secondary voltage at CN6401/pin 1 or CN6150/pin 1. As long as AC power is applied to the TV IC6201 should be active and outputting 3.3Vdc. If the 3.3V is not present then IC6201 is defective. Replacing the power supply board will fix the problem.
Finally, a “Dead Set” condition can be caused by a defective microprocessor IC400. The microprocessor outputs the Power-On signal which activates the switch Q6301 and IC6301 on the power supply board and passes the 19V from the Standby power supply to active the relay (46” models), PFC, and Main Power Supply IC6501. If the Power-On signal is not output after receiving the Power-ON command the power supply board circuits remain inactive and a “Dead Set” condition exists. The Power-On signal can be checked at CN6401/pin 3 or CN6150/pin 3. It should measure approximately 3.3Vdc If the measurement is 0Vdc before shut-off the TV microprocessor is defective. Replace the A-Board. If the power-on voltage is 3V before shutdown then the switch circuit on the power supply board is defective. Replace the power supply board.
Power supply board=APS-260 (CH)
I do not have any blinking lights anywhere.
I have checked the ceramic fuses and have scoured the board for any bad caps or charring. There is a very small white coming out of the post on a ceramic cap, but every board i have seen for this model has this same thing.
I have power coming into power supply
Pins V:
STBY 3.3v
AC_OFF_DET: 2.74v
PWR_ON 3.3V all the time does not matter if I hit pwr button or not.
I have not found 12V anywhere.
When I plug in the AC cord I get a single click. When I DISCONNECT the Main board, It does not click and I do not get any V at PWR_ON, but stby and ac_off_det stay the same.
According to this troubleshooting guide it is the Power Supply board. I just would like someone to confirm I am reading the guide correctly and that this makes sense.
If anyone has further testing I need to do let me know.
Thank you for help in advance!
Chris
I am using this guide to troubleshoot which has me in the right direction, but I am stuck.
No Power/Dead Set (No RED Standby LED)
In a dead set condition there will be No RED Standby LED illumination in the Standby Mode (TV plugged into an active AC Outlet).
The following bullet list gives the possible failures for a “No Power/Dead Set” condition.
• Loss of AC Power
• Loss of AC-OFF-DET
• Loss of Standby 3.3Vdc
• Loss of REG12V
• Loss of Power-On
• Defective Main Microprocessor
The first step in troubleshooting a “No Power/Dead Set” condition is to confirm that 110ACV power from an active AC outlet is applied to the G2LE-Board, G2LE-Baord, or GD2-Board. AC power is applied to, and can be measured at CN6101 on the G2BE-Board or G2CE-Board and at CN6003 on the GD2-Board.
Next, check for the presence of the AC-OFF-DET voltage at CN6401/pin 2 or CN6150/pin 2. If the AC-OFF-DET circuit is working properly 3V should be measured. If the 3V is not present replace the G2BE-Board, G2CE-Board, or GD2-Board. If the 3V in not present either the main fuse or the main power supply IC6501 is defective. In either case, replace the power supply board.
After confirming the AC power and AC-OFF-DET, check for a defective Standby 3.3Vdc power supply IC6201. To confirm a defective IC6201 check the 3.3V secondary voltage at CN6401/pin 1 or CN6150/pin 1. As long as AC power is applied to the TV IC6201 should be active and outputting 3.3Vdc. If the 3.3V is not present then IC6201 is defective. Replacing the power supply board will fix the problem.
Finally, a “Dead Set” condition can be caused by a defective microprocessor IC400. The microprocessor outputs the Power-On signal which activates the switch Q6301 and IC6301 on the power supply board and passes the 19V from the Standby power supply to active the relay (46” models), PFC, and Main Power Supply IC6501. If the Power-On signal is not output after receiving the Power-ON command the power supply board circuits remain inactive and a “Dead Set” condition exists. The Power-On signal can be checked at CN6401/pin 3 or CN6150/pin 3. It should measure approximately 3.3Vdc If the measurement is 0Vdc before shut-off the TV microprocessor is defective. Replace the A-Board. If the power-on voltage is 3V before shutdown then the switch circuit on the power supply board is defective. Replace the power supply board.
Power supply board=APS-260 (CH)
I do not have any blinking lights anywhere.
I have checked the ceramic fuses and have scoured the board for any bad caps or charring. There is a very small white coming out of the post on a ceramic cap, but every board i have seen for this model has this same thing.
I have power coming into power supply
Pins V:
STBY 3.3v
AC_OFF_DET: 2.74v
PWR_ON 3.3V all the time does not matter if I hit pwr button or not.
I have not found 12V anywhere.
When I plug in the AC cord I get a single click. When I DISCONNECT the Main board, It does not click and I do not get any V at PWR_ON, but stby and ac_off_det stay the same.
According to this troubleshooting guide it is the Power Supply board. I just would like someone to confirm I am reading the guide correctly and that this makes sense.
If anyone has further testing I need to do let me know.
Thank you for help in advance!
Chris
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