Kenwood TS-990S Service Manual page 39

13.8V LED drive signal
LED 50
LED power supply
LEDBR
Q4
Power supply control
KI0-KI13
KO0-KO7
KEYO0-KEYO7
Key matrix
tact SW 109
Encoder pulse
Encoder 5
MU/MD
To MIC PCB
X42-343 C/10
MPI1/MPI2/MPI3
MPRE1/MPRE2/MPRE3
IC9,10,11
8ch Multiplexer
VR voltage
VR 11
CIRCUIT DESCRIPTION
IC7
Shift register
SRENA/SRDATA/SRCLK
PA_Y+/PA_X+
PA_Y /PA_X
TP_X1/TP_X2
TP_Y1/TP_X2
TPPUON/TPPRES
MLPWM/MLSYNC
SLPWM/SLSYNC
IC6
Panel MCU
Vcc1: 5V
Vcc2: 3.3V
PBLEN
PRST/BKC/PATXD/
PRXD/PTXD/
PCTS/PRTS/
PFPRG
X1
11.0592MHz
Fig. 45 Display circuit
Q303-Q308
The location electric potential
Touch panel
circuit
IC307,308
Anode/Cathode
Main/Sub LCD
backlight driver
IC303,304,305,306
AND gate
MBLEN
To Control unit
X53-452
PATXD
ABLENM
ABLENS
RGB DATA
To Digital unit
Timing signal
X46-339
TS-990S
Main display
(7inch)
&
Touch panel
Sub display
(3.5inch)
39