LG U8110 Service Manual page 159

4. TROUBLE SHOOTING
TP Command
-mode =4
-Wtxc=9750,0,1,0
-Syct=10700
-Txgn=1,43
-TFTI=10700
Step2: Check PAM control signal from DC/DC converter(N1620)
Check R1603
To Check PAM VCC BIAS
fr om DC/ DC conver tor
(V CC WPA )
Check R1621
To Check DC /DC
conver tor control si gnal
From Vincen ne(N2000)
(WDCDCREF)
Mean Value
2.4V ?
Yes
Change the PAM
Mean Value
2.5V ?
Yes
Mean Value
Change the DC/DC
Converter
Before Change board,
check soldering VBATI(R1631)
- 160 -
No
Check The DC/ DC
convertor(N1620) Part
No
Change the Board
Before Change board,
Check soldering(R1621)