How to repair LCD TV Auto Change Channel
Problem
Model : Hisense TLM26V68 LCD
TV
Chassis:
MST721DU
Symptom: LCD TV with auto change channel problem

The complaint of this Television was TV channel will automatically change. During initial observation, the television sound and display were
normal. The problem only occurs while watching television programs. First suspect was the remote control or
the push button front panel controls. Removed
the remote control batteries the problem still remains. Disconnected the CN8 connector (control panel pcb board of
the tv) still with the same problem.
Have tried to replace the crystal of main chip, but the problem remain the same. After that,
checked the supply voltage to main chip, 3.3V_MST line was getting 3.7V instead of 3.3 volt. So suspect the U2
3.3V SMD voltage regulator IC have problem. After replaced the U2 IC, the TV was back to
normal!


Conclusion: Even this article a bit
short, but it is helpful to us. We know why the lcd tv can be auto change channel during initial observation now. This method can apply to other tv like
Plasma Tv too. So you can use this method to troubleshooting lcd or plasma tv mainboard and find out the
culprit!
To your success!
Kent
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