Hi, I bought a defective OLED Tv thinking I would just replace the defective board and make it work. The problem was that the TV would turn on with sound but no image. I replaced the TCON first, didn't do anything so I replaced the main board and psu boards too but to my surprise the problem is still there.
So I began testing the PSU to see if at least all voltages were good. What I found is that all the voltages seem good (standby, AC_On, TCON_12v and PWR_On). The missing voltages seem to be EVDD and I'm not sure if BL_ERR should be high or low and if EVDD_ON should be just a pulse or a steady 3.3v.
The EVDD is present for a second, when the tv turns on (there is a relay that clicks) but then it vanishes.
I think that if I can find why this voltage dissapears (maybe there is a bad cap or short circuit?) It would fix that black screen issue.
I don't have the service manual which would be very handy so any help is appreciated.
here's a picture of the power supply.
So I began testing the PSU to see if at least all voltages were good. What I found is that all the voltages seem good (standby, AC_On, TCON_12v and PWR_On). The missing voltages seem to be EVDD and I'm not sure if BL_ERR should be high or low and if EVDD_ON should be just a pulse or a steady 3.3v.
The EVDD is present for a second, when the tv turns on (there is a relay that clicks) but then it vanishes.
I think that if I can find why this voltage dissapears (maybe there is a bad cap or short circuit?) It would fix that black screen issue.
I don't have the service manual which would be very handy so any help is appreciated.
here's a picture of the power supply.
Comment