Hello. Working on a Hisense 50P7 which powers on with backlight and sound. but no image of any kind (menus etc) the sound works via both tuner input and HDMI.
I have measured the power supply voltages. 12V and 18V pins all measure correct. However “STB” only measures 0.5V when off and 2.7V when on. Which seems off to me.
Have measures all backlight connections have ~47.3V on all VO pins. And 4.7-5.3V on all backlight led pins. While the backlight is dim. It appears to he consistant when veiwed in a dark room.
When powered on. The power led flashes 17 times. Not sure if that is relevent but earlier models seemes to use it for fault codes.
Have disconnected and reconnected all plugs / ribbons with no change in behaviour
Have measured the fuse on the video driver pcb and that is still intact (measures about 11.6V)
None of the capacitors loom to have a bulge. But have not yet removed and measured them.
Looking for any insights into what may be the underlying fault and where I can start.
Hello. Working on a Hisense 50P7 which powers on with backlight and sound. but no image of any kind (menus etc) the sound works via both tuner input and HDMI.
I have measured the power supply voltages. 12V and 18V pins all measure correct. However “STB” only measures 0.5V when off and 2.7V when on. Which seems off to me.
Have measures all backlight connections have ~47.3V on all VO pins. And 4.7-5.3V on all backlight led pins. While the backlight is dim. It appears to he consistant when veiwed in a dark room.
When powered on. The power led flashes 17 times. Not sure if that is relevent but earlier models seemes to use it for fault codes.
Have disconnected and reconnected all plugs / ribbons with no change in behaviour
Have measured the fuse on the video driver pcb and that is still intact (measures about 11.6V)
None of the capacitors loom to have a bulge. But have not yet removed and measured them.
Looking for any insights into what may be the underlying fault and where I can start.
Hello. Working on a Hisense 50P7 which powers on with backlight and sound. but no image of any kind (menus etc) the sound works via both tuner input and HDMI.
I have measured the power supply voltages. 12V and 18V pins all measure correct. However “STB” only measures 0.5V when off and 2.7V when on. Which seems off to me.
Have measures all backlight connections have ~47.3V on all VO pins. And 4.7-5.3V on all backlight led pins. While the backlight is dim. It appears to he consistant when veiwed in a dark room.
When powered on. The power led flashes 17 times. Not sure if that is relevent but earlier models seemes to use it for fault codes.
Have disconnected and reconnected all plugs / ribbons with no change in behaviour
Have measured the fuse on the video driver pcb and that is still intact (measures about 11.6V)
None of the capacitors loom to have a bulge. But have not yet removed and measured them.
Looking for any insights into what may be the underlying fault and where I can start.
[image|1943290]
[image|1943291]