My beloved plasma which broke 3 months out of warranty has been sitting on my dining room table for 6 months now. Dead with 4 blinks of the power led which indicates bad power board. I've replaced it with 3 used boards, 3 mother/A boards and still nothing. I bought all the guts out of a "smashed screen" tv installed all those, A,P,SC,SS and buffer boards and still got 4 blinks.
When I plug in the tv and check the voltages, I got the 5v standby, I've got the 3.2V and the 15V, then it shuts down and blinks 4 times.
I tried disconnecting the SC power connector like TVcoop did and it went to 7 blinks. Do I have another bad SC board?
The standby circuit in the power supply to produce STB5V. The STB5V is provided to the A board via connectors P7 (Pin 1).
The STB5V from pin1 of connector P7 is applied to a 3.3V regulator to power the Main CPU (IC8001) on the A board. This energizes and prepare the microprocessor (CPU) for program execution.The power command from the power switch on the A board or the remote control receiver on the K board is provided to the Main CPU on the A board (IC8001). The CPU on the A board outputs the “TV_SUB_ON” Command (3.2V) and the PANEL_STB_ON” command (3.2V).
The “TV_SUB_ON” command is provided to pin 5 of connector P7 of the power supply to develop the F+15V. At this time, the relays on the power supply are triggered and a “click” sound can be heard.
The F+15V from the P board is applied to several voltage regulator (IC5608- IC5610, and IC5606) on the A board. The voltage output from these ICs are SUB5V, SUB1.8V,
and SUB1.2V respectively. They are used by various circuits on the A board.
To avoid catastrophic failures, they are monitored by an SOS Detect circuit (IC4700) for over-voltage and over-current conditions. Any abnormalities of the SUB5V,
SUB1.8V, or SUB1.2V triggers the SOS circuit. The TV shuts down and the power LED blinks 10 times.
When I plug in the tv and check the voltages, I got the 5v standby, I've got the 3.2V and the 15V, then it shuts down and blinks 4 times.
I tried disconnecting the SC power connector like TVcoop did and it went to 7 blinks. Do I have another bad SC board?
The standby circuit in the power supply to produce STB5V. The STB5V is provided to the A board via connectors P7 (Pin 1).
The STB5V from pin1 of connector P7 is applied to a 3.3V regulator to power the Main CPU (IC8001) on the A board. This energizes and prepare the microprocessor (CPU) for program execution.The power command from the power switch on the A board or the remote control receiver on the K board is provided to the Main CPU on the A board (IC8001). The CPU on the A board outputs the “TV_SUB_ON” Command (3.2V) and the PANEL_STB_ON” command (3.2V).
The “TV_SUB_ON” command is provided to pin 5 of connector P7 of the power supply to develop the F+15V. At this time, the relays on the power supply are triggered and a “click” sound can be heard.
The F+15V from the P board is applied to several voltage regulator (IC5608- IC5610, and IC5606) on the A board. The voltage output from these ICs are SUB5V, SUB1.8V,
and SUB1.2V respectively. They are used by various circuits on the A board.
To avoid catastrophic failures, they are monitored by an SOS Detect circuit (IC4700) for over-voltage and over-current conditions. Any abnormalities of the SUB5V,
SUB1.8V, or SUB1.2V triggers the SOS circuit. The TV shuts down and the power LED blinks 10 times.
