NAD T748 - Troubleshooting Guides; HDMI Part Troubleshooting

* T748 HDMI PART TROUBLESHOOTING
G.NG.N
KOKO
G.NG.N
OK
N.G
OK
N.G
CHECK AT POWER
SUPPLY
CHECK AT CN901
WAFER & INPUT PCB
REGULATOR & IC
REPLACE
CHECK AT CN901
PIN1(+12V), PIN5(+5.6V),
PIN9(+2.5V), PIN13(+12V)
CHECK AT IC911, IC912,
IC913, IC917, IC918,
IC915, IC916
CHECK AT POWER
SUPPLY CIRCUIT &
IC REPLACE
NO HDMI AUDIO
OUT
REPLACE HDMI
JACK or CONNECT
THE HDMI CABLE
INTO THE JACK
CHECK HDMI JACK
IS POWER APPLIED
CORRECTLY TO EACH
POINT?
CHECK AT CN903 PIN
2,3,4,6,7,8,9
CHECK AT
RN950, RN951, RN953
RN953
CHECK POWER
SUPPLY CIRCUIT
(CHECK IC POWER
PIN)
CHECK OPEN
CIRCUIT or SHORT
CIRCUIT
CHECK OPEN
CIRCUIT or SHORT
CIRCUIT
OK
N.G
RN953
CHECK AT IC913
PIN2 ~ PIN9,
PIN11 ~ PIN18
CIRCUIT
CHECK OPEN
CIRCUIT or SHORT
CIRCUIT
2-86