OLED55C6P WebOS 3.0 UHD OLED TV 3 Step Start Up Sequence
Explanation and Circuit
Start-Up Sequence (STBY and Step 1) OLED55C6P (2016) Disassembly Section
Please refer to the diagram on page 3 for this description. This will describe the 3 Step Start-Up Sequence of the OLED55C6P television. When the TV is
not on (known as the Stand-By state), the power supply is producing a Stand-By voltage of 3.5V.
STAND-BY: When AC is applied to the SMPS, it outputs 3.5V_ST (P201 pins 5, 7 and 8) to the Main board, (P1000 pins 3, 5 and 6). This 3.5V is routed
through L1000 and on to the Microprocessor IC3000 pin 48 as its main power source. The crystal X3001 (32.768 KHz) starts to be used the main clock
for the Processor. The 3.5V also goes to the Reset circuit. At the moment 3.5V routed through R3020 and arrives at C3005 (+) side, the capacitor isn’t
charged, so pin 40 (through R3019) of the Micro is held 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
Stand-By state The 3 5V is pull-up now in the Stand state. 3.5V also routed to pull resistors (R4110 and R4111) for the Key 1 and 2 lines. 3.5V is also sent to the IR receiver
via P4001 pin 4 and as source voltage for the Power on switch Q1001, but Q1001 is not on at this time.
1) STEP (1) RL_ON/PWR_ON: 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 the IR signal (3.4V p/p) to the
Microprocessor pin 6 and the Micro knows (after decoding) this signal means to turn on.
I. The Micro outputs a low (0V) 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
(3.40V) 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 (11.94V) and the 24V (24.56V) which are routed back to the Main board.
II. 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 pins
9, 11 and 14). Note, the 24V is labeled A13V on the Main board schematic.
• A13V (24V): This is used for the two Audio amplifiers, (Front IC5300 and Woofer IC5400).
o The A13V (24V) is routed through coil L5305 and called +13V_AMP_FRONT for IC5300 and through coil L4305 and called
+13V_AMP_CENTER for IC5400.
o When the 24V arrives on the Main board, it is also routed to IC1300 (Power Detector) pin 3 (3.70V). This IC then outputs a high
(3.64V) from pin 2 called (POWER DET) to the Micro pin 14 to notify the Micro that the 24V has 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”. The Power LED will blink 3 times.
o Note: OLEDAC_DET (3.53V) P1000 pin 22 (ACD from the power supply P201 pin 4) is also monitored. This voltage is sent to IC1301
pin 3 (3.61V). The output pin 2 (3.64V) is connected to the same POWER_DET line as described above. If the Power Supply is
missing AC input, pin 2 drops low, the TV will not come on and 5VMNT is registered in the Power Off History menu.
o Once the Micro knows the 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
+3.3V NORMAL regulator. This 3.3V is routed to many different circuits, but one of them is 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.
• +13V (12V): This is routed to many different regulators such as the, PANEL_VCC, IC1400 +3.3V_Normal, IC1600 +5V_Normal, IC1800
+1.8V_IO, IC2000 +0.9V_Core, IC2100 +0.9V_CPU, IC9300 +0.9V_VDD and IC9400 DVDD15.
B tf l t i thi “P O Ci it” di i ill b i IC1400 (+3 3V l t B thi 3 3V ill b
August 2016 Page 01 LG
o But for later on in this Power On Circuit” discussion we will bring up 3.3V_NORMAL) regulator. Because this 3.3V will be
used 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.
