It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
Text excerpt from page 30 (click to view)
Troubleshooting
5-3 No Sound
No Sound, but Picture is in normal operation
Normal
Check the CN602 Connection and Signal
Abnormal
Check the Speaker Wire Connection
Normal
Check 14V Line
Abnormal
Check IC602 #7 (If the pin is in low state, Sound is mute) Normal
Abnormal
Check FA803S
Check D816, Q906 Check IC601 #24, #25 Normal Replace IC602 Check IC601 Input Voltages (5V,8V) Normal Check the coils around IC601 Check IC601 Input Signal Normal Replace IC601 Check the Tuner Abnormal Abnormal Abnormal
