Hitachi 42HDT51M Service Manual page 49

(*2) Arrangement of Control button
11. TROUBLESHOOTING FLOWCHARTS
How to get to Burn-in mode for 55" Model.
Press Sub-Power button, input Select button
and hold for more than 5 seconds
Is Q930 ( C ) voltage
intermittent oscillation?
Is I901 ( 4 ) pin voltage
at the moment of power-ON
Is I901 ( 4 ) regular voltage
Check Q932, D934, D937,
I902, D906, etc.
Trouble of Main Switching-regulator
A
Yes
over 3.5V?
No
Is I901 in
Yes
No
Yes
below 16V?
No
Yes
below 10V?
No
Check Q930, Q931, etc.
Check D937,Q932
T901, I901, I902, etc.
Check D903, D902, etc.
Check D909, C912, etc.
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PT5-G/PW1-H