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How to Repair TV No Signal and AV have Display but No Sound
Model: Hisense TLM2233 LCD TV
Symptom: When in TV mode, the screen shows NO SIGNAL. Try using the AV signal input, got display but no
Power on the Tv, screen display NO SIGNAL and it is showing the snow only. The whole Tv control
on/off and other function normal. Try to search the TV channel and can’t find any TV signal! Changed to AV
mode, the screen displays present perfectly but no sound. Even adjust the sound volume to maximum also
Check the TV tuner 5V ok but the 33V missing. Check their tuning boost feedback circuit 12V got
0V! Found the service manual and check their audio section was using the same 12V line too. So both symptom
of this lcd tv was causing by this 12V line became 0V.
So trace this 12V line on the mainboard and found this 12V line was supply from power supply
secondary side and go through U23 (IRF7314) and reach to Tuner and audio section. This U23 function as a
switching control and it can on or off the voltage output. After that measuring Q8 base pin for 0.6V normal,
U23 pin 1 got 5V input and pin 7 & 8 output normal 5V. Again measuring Q12 base pin for 0.6V ok, then U23
pin3 no 12V input. After that measuring CN16 pin 5, pin6 got normal 12V supply.
Apparently the problem is in between 12V supply (CN16 pin 5 & 6) through U23 pin 3!
Using multimeter ohm range, measure in between the CN16 pin 5 through U23 pin3, the meter reading it about
50+ ohm! If normal value it should be 0 or very low ohm. And this line ohm values sometimes can go to
100~300Kohm too! So the circuit line can get unstable ohm values, that’s mean the circuit was intermittently
break line. Check the printed circuit board and found the line have circuit hole across PCB bottom side and
reach the U23 pin 3. After measure the circuit hole with meter and confirm that circuit hole was causing
the break line. Using a thin-wire and insert it into the circuit hole and then solder both
Finally this LCD TV can search the Tv channel and the AV mode can hear the sound. This lcd tv
back to normal now!
Conclusion: The circuit hole can be break
line, it was because of this circuit line loading heavier electricity (12V & 5V) and resulting
in heated completely.
** Today i just received an email
from my member. He had using the above repair tips and solved his 50 inch
LCD Monitor! Congratulation to him!
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