Sony Bravia KDL-55W790B, Service Manual, Page: 68 / 165

Chassis: RB2G, HE-L
Chassis: RB2G, HE-L 68
2.3-6 - NO SOUND: HP/LINEOUT ONLY FOR BAX-L (HEL, HEH, HM) BOARD ONLY
RB2G CHASSIS
W700B/ W800B
Troubleshooting
2-3-7 No Sound: HP / Lineout Only for BAX-L (HEL HEH HM) board only
No Sound
2 3 7. No Sound: HP / Lineout Only for BAX L (HEL,HEH,HM) board only
Note:
(AYU2/ Ayu2L ) –
IC9000
(Brownie)- IC9001
HP / Lineout only
BAX-LPower On checking
This is for Main SP got sound, but HP / Lineout no sound
RB1 Main Board Power On Checking
No Checking Item OK NG If

NG
1 Insert HP Jack. Check R4508 Vdc = 3.3V ± 0.3V Vdc = 0V or < 1V Check HP_DET line
(R7020 – for BAX-L)
got short to GND? If short to GND got short to GND? If short to GND
replace board.
2 Check IC4501 Pin 5
(X AUDIO MUTE SPHPLO)
Vdc = 3.3V ± 0.3V Vdc = 0V or < 1V Check X_AUDIO_ MUTE_ SPHLO
(Pin 5) short to GND. If short to GND ( _ _ _ ) ( )
replace board.
3 Check CL4505, CL4506.
(with audio signal input)
Can see audio signal
waveform
Cannot see audio signal
waveform
Go to below item No. 4 for checking
4 Check IC4501 pin 9 Vdc = 3.3V ± 0.3V No 3.3V supply. Please refer
item 3-3-1. No POWER DC /
DC Converter Check
.
5 Check CL4501 CL4502 Can see audio signal Cannot see audio signal Brownie IC (IC9001) NG 5 Check CL4501, CL4502
(with audio signal input)
Can see audio signal
waveform
Cannot see audio signal
waveform
Brownie IC (IC9001) NG