65" rca backlight issue

[Rjholly71]

picked up a RCA 65g55r120q that had stand by but no power up had 2.7 to main board and blinking red so i figured it would be main board. I wasn't too excited about the $125 price tag on a new main board so i decided to wait. I found a donor tv that had a different number I decided to see if it would work i noticed that the plug on the main board that goes to frc board wasnt the same so i left it off i noticed the standby light was no longer blinking and would turn off when power button was pressed. I noticed that if i left that same set of wires unplugged from my original main board that the blinking stand by light went solid. so I swapped out frc board and the jumper that goes to main board. and i am able to power on the set no blue light when powered on (i think there's supposed to be one) but backlights would only flicker once as the set was being turned off. so i swapped out power supply / led board with donor and it does the same thing that the donor tv did which is back lights would intermittently flicker on then off not long enough to see if there is a picture. am i looking at bad caps or a deeper issue? thanks in advance
forgot to add when backlights would flicker only 9v at power supply to panel

[dskall]

Re: 65" rca backlight issue

Need good clear sraight on pictures of back of tv with cover off and each board.

Need voltages from connector that goes from power supply board to main board. Will need pin#-pin label-Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Label - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

[heavymachines]

Re: 65" rca backlight issue

Read sticky threads in this section of forums and apply what you find, then maybe you'll get help. But i would put original back in. Sounds like u found a slightly different version of main. That looks close. Just to let you know there are mains that look identical and one will be for plasma and the other will be for lcd. Just slightly different part numbers and or version number. and it will not work.

[Rjholly71]

Re: 65" rca backlight issue

Read sticky threads in this section of forums and apply what you find, then maybe you'll get help. But i would put original back in. Sounds like u found a slightly different version of main. That looks close. Just to let you know there are mains that look identical and one will be for plasma and the other will be for lcd. Just slightly different part numbers and or version number. and it will not work.

Original main board is in just used a donor to see what it would do and stumbled on to solution for original problem of blinking stand by

[Rjholly71]

Re: 65" rca backlight issue

Need good clear sraight on pictures of back of tv with cover off and each board.

Need voltages from connector that goes from power supply board to main board. Will need pin#-pin label-Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Label - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

Will get pics tomorrow after work thank you for your response

[Rjholly71]

Re: 65" rca backlight issue

Sorry here is what I found
Power in: 120 v
Com 2 pin 1: 0v
Pin 2: 0v
Pin 3: 0v
Pin 4: 0v
Pin 5: 21.5 v
Pin 6: 12.5 v
Pin 7: 0v
Pin 8: 12.5v
Pin 9: 0v
Pin10: 12.5v
Pin11: 0v
Pin12: 5v
Pin13: 5v
Pin14: 5v
Pin15: 4.5v
Pin16: 5v
Pin17: 4.5v
Pin18: 3.25v

Com 5
4.7v right and left
Main board
Main power
Pin 1: 12.5
2: 3.25
3: 5
4: 5
5: 5
6: 5
7: 0
8: 4.5
9: 5

Controls/or
1:0
2:3.2
3:3.2
4:3.23
5:3.3
6:3.3
7:3.3
8:3.3
9:0
10:5.5
11:.5.1
12:.03
13:5
Conj 1 adj
1: 0
2: 0
3: 4.6
4: 3.25
5: 12.6
6: 5.1

Con a3
1: 0
2: 0
3 12.6
4: 12.6

[budm]

Re: 65" rca backlight issue

No pin names to tell us what those pins are for?
There are charts printed on the board so put there name right next to your reports so we can easily identify the readings.

[dskall]

Re: 65" rca backlight issue

Need pin description don't know what voltages should be on pins.