Power On - Sony KD-34XBR2 Training Manual

Chart 18-2 – Primary Power Supply Voltage Distribution G Bd to A Bd
Primary PS Output
Sub 6.5V (digital)
11Vdc
7V or 6.5V (analog)
Secondary PS
The secondary power supply starts after being enabled by the primary power supply, the Main Micro and the
surge relay. Figure 18-1 shows that the primary power supply makes VC1 to enable the secondary supply. The
second enable line comes from the Main Micro IC001 as a " Main Sw" HIGH voltage (CN6101/pin 9 = 5V) about ½
second after power ON. The third enable comes from the surge relay RY6002. If the RY6002 contacts close
before the capacitor in the Q6004/5 latch circuit charges, the latch does not activate and the V sense 2 line into
the secondary power supply is enabled. The secondary power supply may now power up because its V Sense
input is allowed to go HIGH.
All secondary PS outputs are fused, except the 19V and 135V lines. This power supply is connected to the D
(deflection) and K (audio) boards. The D board supplies 15V and 135V to the A board. The destinations for the
secondary power supply are listed in Chart 18-3.
Primary PS Output
+15Vdc
19Vdc
+22Vdc
135Vdc

Power ON

The power ON sequence is similar to the HA-3 chassis (model KD34XBR2). Pressing the front panel or remote
control ON button activates power ON. Main Micro IC001 responds by energizing the AC relay (RY6001), which
powers the primary power supply. The primary power supply and Main Micro then turn ON the secondary power
supply to supply the remaining power to the TV set for operation. The sequence is summarized in Chart 18-4.
Location
CN6104/pin 8,9 CN3015/pin 1,2
CN6104/pin 1 IC3002 Regulator
IC3005 Sw Regulator
CN6104/pin 2,3 IC3003 Regulator
IC3007 Sw Regulator
Chart 18-3 – Secondary Power Supply Voltage Distribution
Location D board Destination
CN6106/pin 1,3 IC8003 Vert Out
IC8004 Regulator
Through to A board
CN6102/pin 7,8
Through to K board
CN6106/pin 4,6 IC8001/2 Conv Amps
CN6106/pin 9 H Drive, HV Conv
Through to A board
A board Destination
79
18. RA-5A Chassis - Power Supply Block
Output Final Destination
6.5Vdc QM board CN7001/pin 1,2.
9V QM board CN7001/pin 9.
Sub 9V B board CN3020//pin C4,5
9V A board IC3021 5V Regulator
5V QM board CN7001/pin 5.
5V B board CN3020/pins C6,7
5V AD board CN3012/pin 17,
Output Final Destination
12Vdc
+15Vdc A board CN8004/pin 8,10
19Vdc K board CN2104/pin 7,8
135Vdc A board CN8006/pin 10