
* T748 HDMI PART TROUBLESHOOTING
G
.
N
G
.
N
K
O
K
O
G
.
N
G
.
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
Summary of Contents for T 748
Page 1: ...L A U N A M E C I V R E S AV Surround Sound Receiver T748 AV Surround Sound Receiver T748 ...
Page 6: ...DISASSEMBLY REMOVAL OF FRONT PANEL 1 6 ...
Page 7: ...PRINCIPAL PART LOCATION 1 7 ...
Page 18: ...IC 211 MX29LV32DTTI 70G FLASH OF DSP 2 6 ...
Page 19: ...2 7 ...
Page 29: ...2 17 BLOCK DIAGRAM ...
Page 40: ...IC 913 IC 918 TC74VCX541FT OCTAL BUS BUFFER 2 28 ...
Page 44: ...BLOCK DIAGRAM MCU DSP PART 2 32 2 33 ...
Page 45: ...BLOCK DIAGRAM AUDIO PART 2 34 2 35 ...
Page 46: ...BLOCK DIAGRAM HDMI PART 2 36 2 37 ...
Page 62: ...2 68 2 69 PRINTED CIRCUIT BOARD FRONT TOP VIEW ...
Page 63: ...2 70 2 71 FRONT BOTTOM VIEW ...
Page 64: ...2 72 2 73 INPUT TOP VIEW ...
Page 65: ...2 74 2 75 INPUT BOTTOM VIEW ...
Page 66: ...2 76 2 77 MAIN TOP VIEW ...
Page 67: ...2 78 2 79 MAIN BOTTOM VIEW ...
Page 68: ...2 80 2 81 SUB TOP VIEW ...
Page 69: ...2 82 2 83 SUB BOTTOM VIEW ...