Hello,
When I try to start my Sony Bravia KDL-55HX825 it lights up for about a second and then shuts down and shows the blinking code 4.
The Sony Logo at the bottom of the TV and the background light flash up very shortly. But two times the TV displayed the Sony Logo shortly on the screen before it shut down.
I already measured some things:
I found the schematics for the psu and the service manual online. I attached it to this thread.
At the moment I don't know what to check next. Maybe someone had the same problem some time ago?
Greetings from Germany,
Hauke
When I try to start my Sony Bravia KDL-55HX825 it lights up for about a second and then shuts down and shows the blinking code 4.
The Sony Logo at the bottom of the TV and the background light flash up very shortly. But two times the TV displayed the Sony Logo shortly on the screen before it shut down.
I already measured some things:
- The main psu seems to work. 3v3 is alive and 12V gets active when I pull POWER_ON high
- The second psu (for the backlight) generates about 60V when the TV starts and decreasingly falls to 0V after a second
- BL_ERR is about 0.7V in standby, then goes down to 0V, up to 3V and down to 0V (could“t check with oscilloscope yet)
- When I add a resistor to pull BL_ERR high or low nothing changes
- When the TV shuts down POWER_ON at the psu gets low and 12V is off, which deactivates the second psu
- The backlight LED strips are ok. I already disassembled the whole panel just to see that there was no failure
I found the schematics for the psu and the service manual online. I attached it to this thread.
At the moment I don't know what to check next. Maybe someone had the same problem some time ago?
Greetings from Germany,
Hauke
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