Service manual

Check if there is input at Pin3ǃPin5 of U19 Check if there is output at Pin4ǃPin6 of U18
No
No
Yes
Yes
Replace U7
Check the circuit between U19 and Pin1ǃPin9 of U18
No sound but have picture
Change Mainboard
Still having problems
Check if there is sound input signal
No
Check the input source
Yes
No
Verify if U18 has the right power in (Pin 7)
Check if there is output at Pin1ǃPin7 of U19
Change U18
Yes
Check if there is signal at C219 and C212
No
check the signal input circuit of C219, C212
Yes
Check if there is input at Pin1ǃPin9 of U18
Yes
Change U19
No
Check the speakers
Service Manual
Model No.:
- 50 -