Philips BDL4785SL/00, Service Manual

Page: 138 / 141

138 BDL4 7 85 S L LCD
Repair Flow Chart
Audio output is no sound
Check control pin
AUDIO_ S W_ S E1’ 2 oper a tion
is nor ma l
Check Audio bo a rd power 1 2 V is
correctly?
To m e a sure a udio bo a rd U1
output w a ve f or m (1K Hz
sinew a ve)
Check m ute pin
AUDIO_VOL_ON is hi g h or low
Yes
Yes
To m e a sure a udio bo a rd U1
output w a ve f or m
Yes
Check GPIO control pin (R 277 , R 27 8) st a tus
Check GPIO control pin(R49 2 ) st a tus
Check a udio bo a rd U1 solderin g or ch a n g e
a nother chip No
No
No
Check a udio bo a rd U6 (Power AMP)
solderin g or ch a n g e a nother chip
No
Yes