Haier LE40U5000TF Service Manual page 40

• Mainboard not work
• 1. check if the power supply have
12V and 5V output
• 2.Verify if the DC/DC convertors
have the right output
(5V,3.3V,1.8V,1.15V)
• 3.Verify if the
Mainchip(MSD3458), DDR,
AudioAMP...solder well;
• 4.Verify if the FLASH(U18) has the
right software and work well;
• 5.Verify if the Y100(Crystal) has
the right frequency
Panel not work
v
1. check if the voltage input and
v
output of boost IC is working
normally.
2.Verify if the Mainboard output the
v
right On/Off signal to power board;
3.Verify if the Mainboard output the
v
Vby1 singal to panel T-con board
4.Verify if the software is the right
v
version of this model.
5.Change the Vby1 wire to check
v
if it's broken.
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