TC- P50C2 power supply

[bikerbuddy]

Need some help on this TC- P50C2 power supply, Picked up this TV from a Craigslist seller ,brought it home and found out there is no power, no light, not even a relay click .

Poped it open and look around on the P/S , both fuse are ok, bridge rectifier ok ,no power on the 450v 300uf main cap , I have 123v ac volts on jumper next to relay 002. please advise .

[tw2005]

Re: TC- P50C2 power supply

could very well be bad A board, check standby voltages. as a guide this is for the S2 models but in principle it's the same. I think the C2 has a power button on the front.

The front LED, and relays are driven by the A board so if 5vstb is there A board is cactus.

When the TV is plugged in:
AC is applied to 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 3.3V from the voltage regulator besides being applied to the CPU, is also applied to the remote control receiver and the power LED on the K board through connector A1/K1 (pin 3).
If the STB5V is missing, the TV is dead (No power)

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.
The “PANEL_STB_ON” is used to turn on the 3.3V regulator (IC9004) on the A board.
The output voltage is applied to the “Panel CPU” on the A board. The Panel CPU on the
A board outputs the “PANEL_MAIN_ON” Command (3.2V) to pin 7 of connector P7 on
the P board. The “PANEL MAIN ON” command turns on the power supply circuit that
outputs the Vsus, Vda, and 15V.

[bikerbuddy]

Re: TC- P50C2 power supply

TW2005 confirmed 5V standby is present

[tw2005]

Re: TC- P50C2 power supply

A-board, will be hard to find one and ModuslinkPTS which did repair no longer does. Watch the revisions for the A boards as the same blank PCB is used in HD and FHD models. Chalk & cheese

[bikerbuddy]

Re: TC- P50C2 power supply

Yes TW Saw some on ebay darn expensive I'll just put it aside for now until .
Thanks for the help TW2005.

[bikerbuddy]

Re: TC- P50C2 power supply

Question: The A board in the TV presently is a TNPH 0831 3 A, looking at the schematic for this TV is showing TNPH 0831 1 A , Now should I be looking for a version 1 instead of version 3 .I do not know if the version 3 is the original or some where back it was swapped by previous owner .thanks

[aaronwt6]

Re: TC- P50C2 power supply

Examine the suffix chart rather than the board revision. I see both AC and AV suffixes listed for that TV at shopjimmy. It's critical to match that suffix on Panasonic sets to ensure that it will work properly.

[bikerbuddy]

Re: TC- P50C2 power supply

Conclusion for this TC- P50C2 as mention by TW 2005 & ArronWT6 It was the main board that was dead , had the 5v stand by that is as far as it would go
Took me two months to find the right main board with the right Suffix as per ArronWt6, Thanks to all u guys to help get this tele back alive .

[tw2005]

Re: TC- P50C2 power supply

Conclusion for this TC- P50C2 as mention by TW 2005 & ArronWT6 It was the main board that was dead , had the 5v stand by that is as far as it would go
Took me two months to find the right main board with the right Suffix as per ArronWt6, Thanks to all u guys to help get this tele back alive .

cool