No Sound; Psu Failure Check - Haier HL42T Service Manual

First, check cables which connect with PSU，then check as follows
1) Check input voltage (CNA1)
2)Check output voltage (CND1)

10.1.3 No sound

First，check cables which connect with PSU，then check as follows
1) Check input voltage as NO picture
2) Check speaker output

10.2 PSU failure check

State: No power
First, check cables which connect with PSU, then check as follows
1) Check PSU input voltage（AC input）(CN1)
2）Check PSU output voltage orderly (CN2)
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