3.3.2 Troubleshooting diagram
1. Troubleshooting flow chart for “No OSD” is shown in the picture 3.3.2.1:
Y
N
N
N
N
N
Y
Y
Y
Y
Whether
D3 anode 12V voltage
is normal
Whether there is 12V
voltage on display
screensocket
Whether 3.3V
power supply is normal
Whether it is
normal after changing
display screen
components
Whether 8-digit number
of screen is normal
Change display screen
components
Check DC-DC boost circuit
and peripheral elements
Check whether display screen
flat cable holderhas false welding
Display screen flat cable
holder has false welding
Display screen flat cable
holder has trouble
Change decode chip
Figure 3.3.2.1 Troubleshooting diagram for “No OSD”
No OSD
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