TCP60ST50 7 blibking red lights

[JSJohn]

While watching tv, our plasma turned off. I turned it back on and noticed the LED power indicator was blinking red...7 times.

I did a little troubleshooting, read, watched some videos and went out and purchased a multi-meter. After testing several connectors, I thought the SC board needed to be replaced.

I replaced the board and fired up the TV. 7 red blinking lights. I then found the technical guide for my TV on this forum. After troubleshooting again, I determined that the SU board was shorted.

At the recommendation of the tech guide, I replaced both the SU and SD boards. I attempted to fire up the TV with the old SC board because I started doubting the SC board was bad in the first place. 7 red blinking lights.

I then installed the new SC, SD, and SU boards and fired up the TV. 7 red lights.

At this point, I am questioning if my multi-meter is working (picked up a Consumer Electronics one at Home Depot for $35) or if the info I read on using it is accurate.

This seems like it should've been a fairly easy repair but I am lost. Can anyone provide any guidance? I will continue to research on this forum and try to make sense of the tech guide. Thanks

[tw2005]

Re: TCP60ST50 7 blibking red lights

Would need to know what you did, what you found or what measurements were taken and what they were to have any idea.

For a 7 blink, yes sc,sd,su would be the expected area to fault find and I would start with the SC but given you've replaced all 3 you'd be wondering WTF.

So have you tried checking as it turns on Vsus is present across the p2 or sc2 pins? Expect Volts dc say 215V. We only need to know it's there and in the ballpark.

If Vsus was missing that will trigger 7 blink and I have had a SC board short out and blow the track off the Power board Vsus travelled along creating an open cct.

If good, then try the SC50 jumper test, you disconnect the sd/su from the SC and you unbolt the sd/su boards also from the SC as those bolts are the floating ground points for those boards , there are 4 of these.

Next, on the Sc locate the small 2 pin connector SC50, those 2 pins need to be shorted together, then try to turn the TV on again and see if 7 blinks.

Try both boards, also make sure the board bolts are in and firm and the earth contacts are also clean, I suspect the 2012 TVs also had the same loose bolt issues as the 2011 models where they go loose, arc, burn and cause the boards to lose ground and blow.

If you still get 7 on both boards then either both are bad and assuming Vsus is normal I would think the Aboard would be next thing but I'd probably start checking for shorted transistors on the SC first to confirm if they are bad.

Where was the replacement board sourced from?

[JSJohn]

Re: TCP60ST50 7 blibking red lights

I am attempting to check Vsus. I plugged and turned on TV. I used the black needle to chassis ground and placed the red on P2 1 Vsus. The readings bounced around but I am not getting anywhere close to 215V dc. Is this the correct way to check for vsus presence. I followed the tech guide starting on pg 51 for troubleshooting 7 blinks. I will attempt this again in the morning to see if I can find out if one of my new boards (SC, SU, SD) is bad. Thank you for your help. Everything is screwed in tightly. I ordered parts from Shop Jimmy. Thanks

[tw2005]

Re: TCP60ST50 7 blibking red lights

I am attempting to check Vsus. I plugged and turned on TV. I used the black needle to chassis ground and placed the red on P2 1 Vsus. The readings bounced around but I am not getting anywhere close to 215V dc. Is this the correct way to check for vsus presence. I followed the tech guide starting on pg 51 for troubleshooting 7 blinks. I will attempt this again in the morning to see if I can find out if one of my new boards (SC, SU, SD) is bad. Thank you for your help. Everything is screwed in tightly. Thanks

is it an auto ranging meter or can the range be set? The problem with cheaper meters is they can be slow. If the range can be set , try setting it.

Chassis and pin 1 or simply there's only 2 wires on sc2, one is gnd one is vsus so could try sticking the probe into the back of the plug one each pin.

If things are low or weird then disconnect sc2 and ss11 and back probe at the p2 just in case the SC is shorting and dragging it down.

I may be off by tomorrow but I'm sure someone will dive in and help.

EDIT:
SJ parts I'd expect to be ok or new removed so this may end up being an interesting one, hopefully the panel is ok.

I'd try that SC50 test too.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

Yes it is an auto.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

I'm getting 120 at p2 back probe with sc2 and ss11 disconnected.

[tw2005]

Re: TCP60ST50 7 blibking red lights

I'm getting 120 at p2 back probe with sc2 and ss11 disconnected.

that's DC ?

[JSJohn]

Re: TCP60ST50 7 blibking red lights

yes

[tw2005]

Re: TCP60ST50 7 blibking red lights

Was it steady before shutdown? leave sc2, ss11 removed, disconnect P35, and at the A board disconnect the 3 white ribbons, turn it on and see if it stays on and what voltage is at p2.

turn it off and then let it sit for 5-10 mins before reconnecting any of thse especially p35 or call it quits. Reason being there's be residual voltage and you don't want any voltage present at p35 when you reconnect or you can spike the panel at the c boards and that will be terminal if the ribbon ics fry.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

still at 120 or so then kept falling. i guess i will call it quits for now. do you suggest I still do the sc jumper test later on? i am unplugging the tv each time i've been disconnecting things. i'm not sure if that's causing a low reading.

[tw2005]

Re: TCP60ST50 7 blibking red lights

still at 120 or so then kept falling. i guess i will call it quits for now. do you suggest I still do the sc jumper test later on? i am unplugging the tv each time i've been disconnecting things. i'm not sure if that's causing a low reading.

My expectation is with all that disconnected it would stay on and a steady reading, what error blink then if it shutdown with sc2,ss11,p35, and 3 white ribbons removed from the A board?

If it's holding 120 and then shutdown then that's an issue I think, you should see Vsus momentarily before a shutdown if it's being turned on.

120 is no good and that would cause 7 blink alone.

too early to say if it's just the p board or A board,

If it's still 7 blinking with those white ribbons removed from the A that would suggest A board.

you'll have to work the problem a bit more I think, more evidence.

[tw2005]

Re: TCP60ST50 7 blibking red lights

handy guide

[JSJohn]

Re: TCP60ST50 7 blibking red lights

Thank you for the guide and all of your help. It seems similar to the one I have. I will start looking thru it for any differences. I just fired up the TV with sc2, sc11, p35, and 3 ribbons removed. I tested vsus a few times and got 230 on up to about 300. It reads in that range momentarily and then drops. With all the aforementioned cables removed, 8 blinking.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

After following the tech guide, you sent, I reached the point of testing:

SU41 Pin 2 multi-meter beeps 79.2 ohms and drops
SU41 Pin 6 beeps 78.3 ohms drops

SD42 Pin 2 beeps 77.6 ohms and drops
SD42 Pin 6 beeps 81.5 ohms and drops

Unplugged SC41 and SC42
SU41 Pin 2 no beep
SU41 Pin 6 no beep

SD42 Pin 2 no beep
SD42 Pin 6 no beep

So is this saying that the SC board is bad? All of my testing was done with the TV off and unplugged. The SC board is brand new. If I am interpreting this correct, my new SC board is faulty?

[tw2005]

Re: TCP60ST50 7 blibking red lights

Thank you for the guide and all of your help. It seems similar to the one I have. I will start looking thru it for any differences. I just fired up the TV with sc2, sc11, p35, and 3 ribbons removed. I tested vsus a few times and got 230 on up to about 300. It reads in that range momentarily and then drops. With all the aforementioned cables removed, 8 blinking.

After following the tech guide, you sent, I reached the point of testing:

SU41 Pin 2 multi-meter beeps 79.2 ohms and drops
SU41 Pin 6 beeps 78.3 ohms drops

SD42 Pin 2 beeps 77.6 ohms and drops
SD42 Pin 6 beeps 81.5 ohms and drops

Unplugged SC41 and SC42
SU41 Pin 2 no beep
SU41 Pin 6 no beep

SD42 Pin 2 no beep
SD42 Pin 6 no beep

So is this saying that the SC board is bad? All of my testing was done with the TV off and unplugged. The SC board is brand new. If I am interpreting this correct, my new SC board is faulty?

Don't have time right now to digest it.

If A20,A31 & A32 were removed plus sc2,ss11 and p35 I don't see how the A board would trip with an 8 blink as there are no return signals to trip it with all those removed unless I'm missing something.

I'm not understanding the beep, reading and then reading drops with your tests. Is it set to resistance or continuity?

If measuring resistance and it is only 75 ohms, that's bad but I would also expect thtat considered a short and to be a solid reading, not something that is dropping.

If Vsus is now roughly 215V, 300V sounds crazy but maybe unloaded who knows, try reconnecting ss11 and retest if still good , disconnect that then connect sc2 and see if it goes low again.

Obviously turning it off andletting the volatage to drop first or you are going to get some nice arcing when you connect the boards straight away

[JSJohn]

Re: TCP60ST50 7 blibking red lights

The meter was set to continuity. When I set the meter to resistance. I'm getting:
SU 41 Pin 2 2.7
SU 41 Pin 6 3.1

SD 42 Pin 2 2.7
SD 42 Pin 6 2.6

Please excuse me, I'm still learning how to use a multi-meter.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

I also disconnected 3 blue ribbons from A board, p35, ss11 and sc2 and confirmed 8 blinks.

[tw2005]

Re: TCP60ST50 7 blibking red lights

I also disconnected 3 blue ribbons from A board, p35, ss11 and sc2 and confirmed 8 blinks.

I found my answer in the training guide, Any Combination of A20 – A31 and A32 = 8 blinks so that negates what i wanted to try and a change from earlier series where you could do this.

unfortunately with your last readings without a unit of measure they have no meaning as they could be ohms, kilohms, megohms?

If it's ohms that's bad.

So, I've grabbed a 2011 boardset with the buffers connected to get some idea of what we are expecting here.

SU 41 Pin 2 2.7
SU 41 Pin 6 3.1

SD 42 Pin 2 2.7
SD 42 Pin 6 2.6

SU pin2 and SD pin 6 are both VF5V and that should read something around 2.6-2.7K

If your meter is indicating kilohms at this point, that's a tick in the box

su pin 6 and sd pin 2 are Vscan-F and I struggled to get a solid reading as it just charged the circuit But I saw Megohms, so again provided it is not ohms but megohms or maybe in the hundreds of Kohms then that is also most likely ok.

I would test also su 41 pin 8 and sd pin 1 which are Vfo and I find if the buffer is bad they will be short.

I don't think things are getting any clearer really.

measure the resistance across sc2 pins as well of both boards with nothing connected to it and it may be a good idea of taking an image of the meter display so we can be sure what you're seeing.

I'm most likely going to be offline for a couple of weeks now.

good luck.

[JSJohn]

Re: TCP60ST50 7 blibking red lights

Awwww. I have noticed the meter flashing M, k, and just ohms. The problem with meter is its just bouncing around to much for me to even be able to take a adequate picture. Upon placing the meter, on the SU and SD boards I'm getting k and M but its only for a split second. I am returning the SC board because after isolating it and jumping pin 50 the tv is still blinking 7. Could a bad SC short the new SU and SD? I will be mailing off the SC tomorrow and just trying to decide if I should send all of the boards back for replacement. I now realize the readings I sent previously were in ohms. I just re-tested and I'm getting around the same readings I sent previously. I'm going to return this multi-meter for a more expensive one. I find it odd that I received 3 bad boards unless the old SU shorted the SC. Then the new, shorted, SC took out the new SU and SD?

[tw2005]

Re: TCP60ST50 7 blibking red lights

Awwww. I have noticed the meter flashing M, k, and just ohms. The problem with meter is its just bouncing around to much for me to even be able to take a adequate picture. Upon placing the meter, on the SU and SD boards I'm getting k and M but its only for a split second. I am returning the SC board because after isolating it and jumping pin 50 the tv is still blinking 7. Could a bad SC short the new SU and SD? I will be mailing off the SC tomorrow and just trying to decide if I should send all of the boards back for replacement. I now realize the readings I sent previously were in ohms. I just re-tested and I'm getting around the same readings I sent previously. I'm going to return this multi-meter for a more expensive one. I find it odd that I received 3 bad boards unless the old SU shorted the SC. Then the new, shorted, SC took out the new SU and SD?

A shorted SC generally won't damage the buffers, shorted buffers can damage a good SC.

Buffers should always be checked for shorts.

If the meter is changing range whilst measuring between K and M ohms then chances are they are ok. A short is a short, you will get a low ohm reading and it would be consistant and fairly instant. Changing values and ranges suggests the cct is charging with the small voltage the probes put out

Sending it back and hope it's that , probably not a bad idea and when you get another then do the SC50 test first.