Автор Тема: 2016 (OLED55C6P Series) Power Supply Testing  (Прочитано 456 раз)

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2016 (OLED55C6P Series) Power Supply Testing
« : 22 Февраля 2017, 08:24:46 »
2016 (OLED55C6P Series) Power Supply Testing
Forcing on the Power Supply
Testing the Power Supply
OLED55C6P
Read First Before Beginning the Power Supply Testing Procedure
through L1000 and on to the Microprocessor IC3000 pin 48 as its main power source. The 3.5V also goes to the Reset
circuit. At the moment 3.5V arrives at C3005 (+) side, the capacitor isn’t charged, so pin 40 of the Micro is low while the
power input pin 48 is high. This is known as the reset state, where the Microprocessor is reset to the first operational
state. As C3005 charges through R3030, pin 40 pulls up and the Micro comes out of Reset. The TV is now in the
Stand-By state.
The 3.5V is also routed to pull-up resistors to the Key 1 and 2 lines. It is also sent to the IR receiver and as source
voltage for the Power on switch Q1001 Q1001, but it is not on at this time.
(2) When the Power on key is pressed on the Joy Stick (Press in and hold), pin 31 of the Micro drops. This notifies the
Micro that the TV should turn on. If the Power On key on the Customer’s Remote is pressed, The IR receiver sends this
signal (3.4V p/p) to the Microprocessor pin 6 and the TV knows by this signal to turn on.
(3) The Micro outputs a low on pin 36 (RL_ON) which is routed to pin 2 of Q1001 turning it on. The 3.5V on pin 1 is then
switched out pin 3 and on to the SMPS via pin 23 of P1000. This high arrives at P201 pin 1 and on to the Controller on
the SMPS. This command turns on the 12V and the 24V (back to the Main).
(4) The 12V and 24V lines are routed out P201 (12V pins 11-15 and 24V pins 19-22) and on to the Main board P1000,
(24V pins 3-6 and 12V ) ( ) f f pins 9, 11 and 14). The 24V labeled A13V on schematic) is used for the two Audio amplifiers.
The +12V is routed to many different regulators, but for this “Power On” circuit discussion it goes through two coils
L1001 and L1002 and on to the different regulators.
(5) When the 12V and 24V arrives on the Main board, it is also routed to IC1302 and IC1300 (Power Detectors). These ICs
then outputsa high (POWERDET) theMicropin14tonotifytheMicrothatthevoltagearrivedSotheMicrocan outputs a POWER_DET) to the Micro pin 14 to notify the Micro that the voltage arrived. So the Micro can
continue turning on the rest of the set. If missing, the TV will click on and then Click off. This fault shows up in the
Power Off Status as “5VMNT”.
(6) Once the Micro knows the 12V and 24V has arrived, it outputs a high on pin 15 which is routed to pin 6 of IC1400
turning it on. This IC is the +3.3VNORMAL regulator. This 3.3V is routed to many different circuits, but one of them is
2
g _ g y ,
as a pull-up voltage through R1008 to the INV_CTL (DRV_ON) line. However, the Micro is holding down INV_CTL via
pin 4 at this time.
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