Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
I think I need an oscilloscope to probe some of the lines and voltages at turn on. Its too unclear what is going on using just a meter.
I was able to confirm the IC5000 is outputting a DCDCEN signal for all the regulators and each of the regulators appear to turn on and the voltage ramps up before the whole tv shuts down a split second later.
I put the meter on MAX voltage reading and a few of the rails would peak at around 9.5v but that might just be a spike at turn on. It would be nice to...
rmacintosh
Member
Last Activity: 01-16-2021, 05:57 PM
Joined: 11-10-2017
Location: St Albert
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
Right.
I'm going to probe around those regulators, as well as monitor the DCDCEN pin of IC5000 (analog ASIC) to see if that chip is even telling the regulators to turn on. If this enable pin never tells these regulators to turn on I don't see any need to test these regulators or anything downstream of them. As in the pictures below, the DCDCEN pin from IC5000 controls the operation of IC8704, IC8705, IC8100, IC8101 which provide SUB5V, SUB3.3V, SUB1.5V, and SUB1.1V rails respectively. ...Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
I would consider my soldering abilities very capable. Granted I'd be able to source any of the ICs on this board I'm sure I could replace them. Maybe with the exception of the PEAKS PRO4 processor. I think I could reflow it if needed, but to reball a bag like that would be tough.
Attached picture of a-board. Red circled the regulators, yellow circled is the Analog ASIC chip that could be a potential culprit. The blue circled is the PEAKS PRO4 chip
...
Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
I did some digging for troubleshooting guides that had info on the 3 blink code as well as closely matched my set since I could not drum up any troubleshooting guide for my specific Plasma set (manufactured May 2012).
I came up with the following details:
Below, i have ruled out Vsus or Vda short circuits by measurement.
So that points more to P15V rail problem
Below picture, points again to P15V rail - this time more specific, shorted.
...Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
Sorry my bad,
I did the measurement, but my earlier response had a typo:
So there seems to be no short, just what looks to be capacitor(s) charging through the meter as the resistance reading goes from short cct to open cct in a matter of a few seconds....Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
Not at all.
I have tried both scenarios. No voltage on Vsus (2 cables with Vsus and GND to the SC board and the SS board) or Vda (1 cable with Vda and GND to the C boards) with everything connected and AC plugged in. Also nothing if I try to power on the set with the power button or force on by holding the power button.
If I disconnect both the cables to the SC / SS boards and the C boards I still measure nothing on Vsus or Vda. At any point before, during or after AC is plugged...Last edited by rmacintosh; 03-15-2020, 11:23 PM.Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
My intent with this tv is, hopefully, to not only pinpoint the failure but to perform a component level repair to bring it back to life - if possible. I have found that a few of the boards are available from various sources but the A-board is pretty much unavailable everywhere besides eBay who have a select few for $250-350. That is way more than I am willing to spend.Leave a comment:
-
Re: Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
I measured both (Vsus - P11 & P2 connector, and Vsus - P35 connector) and they start out as a short and quickly resistance climbs to 40+ Mohm
If the TV is plugged in there is no voltage on either.
I'm using the service manual for the TV i found here: [url]https://www.manualslib.com/manual/1223713/Panasonic-Tc-P60gt50.html[/url]Re: Panasonic Plasma repair - TH-P60...ctor) and theyLeave a comment:
-
Panasonic Plasma repair - TH-P60GT50 - Dead, 3 blink code
I aquired this Panasonic 60" plasma around the time my first child was born. It was meant to be a project tv, hoping to fix it chipping away at the repair in my free time. Well that was 2 years ago and i'm really just getting around to making a sincere effort to see if I can ressurect this beast.
The symptoms of the tv ar as follows:[LIST][*]Plug AC in to back of TV[*]After about 2 seconds the relay on the P-sub board will click on and then a fraction of a second later it clicks back off[*]The 3 blink code is given by the power LED[*]If the TV is unplugged and... -
Re: New Members - please post your introductions here
Hello, I am Ryan from Canada.
I am an Electronics Technologist working in the Casino Slots and VLT world repairing all sorts of equipment ranging from Displays/Monitors, Touchscreens, CPUs, Printers, Bill Validators, Cash counters/dispensers, and everything in between.
I am here hoping to not only find and get support but to also share and lend assistance where I can.Leave a comment:
No activity results to display
Leave a comment: