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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