Good day guys
I got the above-mentioned TV from a friend with the following symptoms. Upon switch on, the LG logo will flash momentarily with intervals off around four seconds. I thought it was a backlight issue and ordered a brand new set from SJ. The new set arrived and I installed it with care, making sure it is installed as it should.
When I switched the TV on afterwards, it came on, everything working, but the backlights would slightly blink every 4 seconds. I bought a backlight tester, testing the backlights within the set. With the TV switched on, and driving the backlights with my backlight tester the blink still occurs. I asked the wonderful guys at SJ for advise and they send me a new set of backlights again, and I installed them. Before I put the chassis back I tested the backlights, all working with the following solid voltages(reading on my backlight tester)
LED bank 1 = 186V
LED bank 2 = 124V
After I re-assembled the TV, I switched it on it came on with the same 4 second blinking. I took the following readings of the connector
On connector without LED's (with negative on chassis)
Bank 1 = Range between 226V and 197V
Bank 2 = Range between 173V and 160V
On connector with LED's(negative on chassis)
Bank 1 = 241,1V solid
Bank 2 = 161V solid
On connector with negative on LED-
Bank 1 = Solid 172.8V
Bank 2 = Solid 113.7V
No fluctuations
I've read all the previous threads on this issue, it just seems unlikely that two brand new sets of backlights will have the same issue.
Thank you guys for any ideas
I got the above-mentioned TV from a friend with the following symptoms. Upon switch on, the LG logo will flash momentarily with intervals off around four seconds. I thought it was a backlight issue and ordered a brand new set from SJ. The new set arrived and I installed it with care, making sure it is installed as it should.
When I switched the TV on afterwards, it came on, everything working, but the backlights would slightly blink every 4 seconds. I bought a backlight tester, testing the backlights within the set. With the TV switched on, and driving the backlights with my backlight tester the blink still occurs. I asked the wonderful guys at SJ for advise and they send me a new set of backlights again, and I installed them. Before I put the chassis back I tested the backlights, all working with the following solid voltages(reading on my backlight tester)
LED bank 1 = 186V
LED bank 2 = 124V
After I re-assembled the TV, I switched it on it came on with the same 4 second blinking. I took the following readings of the connector
On connector without LED's (with negative on chassis)
Bank 1 = Range between 226V and 197V
Bank 2 = Range between 173V and 160V
On connector with LED's(negative on chassis)
Bank 1 = 241,1V solid
Bank 2 = 161V solid
On connector with negative on LED-
Bank 1 = Solid 172.8V
Bank 2 = Solid 113.7V
No fluctuations
I've read all the previous threads on this issue, it just seems unlikely that two brand new sets of backlights will have the same issue.
Thank you guys for any ideas
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