Question LG 55" TV Screen goes black but still has sound model # 55lb7200-ub

Mar 1, 2019
2
0
10
0
Hello Tom's Guide. I have a LG tv and the screen goes black but sound stays on. I did the flashlight test and still has a pic just no backlight. I purchased a new powerboard, I'm assuming because the power cable plugs into it, installed it and the problem happens faster now. It used to happen every half hour but now it happened in under a minute. Please advise what I need to try next. I really don't want to buy a new TV. Thanks

OK so I pulled voltages off the board while it was powered on. The backlight works for 5-15 mins then it shuts off. PB803-PB816 all pretty much had voltage when backlights were on and lit up. P251 had 27 volts. After the backlight goes off the voltages are at zero. What should I try next?
Here is the voltages coming off the board just in case it means there's some kind of problems to someone here
P251 - 27.1 Volts
PB 803 - 6.4 V
PB 804 - ZERO V
PB 805 - .8 V
PB 806 - 6.5 V
PB 807 - 12.7 V
PB 808 - 6.5 V
PB 809 - 7.4 V
PB 8010 - 6.4 V
PB 8013 - 13 V
PB 8015 - 6.8 V
PB 8016 - 6.3 V
 
Mar 1, 2019
2
0
10
0
Hello Tom's Guide. I have a LG tv and the screen goes black but sound stays on. I did the flashlight test and still has a pic just no backlight. I purchased a new powerboard, I'm assuming because the power cable plugs into it, installed it and the problem happens faster now. It used to happen every half hour but now it happened in under a minute. Please advise what I need to try next. I really don't want to buy a new TV. Thanks
OK so I pulled voltages off the board while it was powered on. The backlight works for 5-15 mins then it shuts off. PB803-PB816 all pretty much had voltage when backlights were on and lit up. P251 had 27 volts. After the backlight goes off the voltages are at zero. What should I try next?
Here is the voltages coming off the board just in case it means there's some kind of problems to someone here
P251 - 27.1 Volts
PB 803 - 6.4 V
PB 804 - ZERO V
PB 805 - .8 V
PB 806 - 6.5 V
PB 807 - 12.7 V
PB 808 - 6.5 V
PB 809 - 7.4 V
PB 8010 - 6.4 V
PB 8013 - 13 V
PB 8015 - 6.8 V
PB 8016 - 6.3 V
 
Thread starter Similar threads Forum Replies Date
Midget3820 TVs 1
A TVs 2
J TVs 1
A TVs 1
Samantha93 TVs 1
S TVs 0
S TVs 1
animaintatcs TVs 0
S TVs 0
P TVs 1
jesuseverett TVs 4
B TVs 2
D TVs 1
kaikai34 TVs 2
J TVs 1
M TVs 2
R TVs 0
I TVs 0
JNoakes TVs 1
TDHK TVs 0

Similar threads


ASK THE COMMUNITY