Panasonic plasma TH-42PZ80U 2 blink 15v SOS

[jettboat]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

I have this same set was 2 blink code I replaced the ic's & caps on 201 & 301, also the 16n55g's. Initially I had the screen working but it was really bright but could see the picture, all voltages were proper using mm so I adjusted brightness all the way down on the menu. 20 min on then it blew the 16n55g's again. I have no o-scope to see if the voltage is unstable or proper but a have fluke 117mm. is it possible the ic driver is bad causing the 15v to be unstable or the caps take a shot when the fet blew the first time? Ordering two more fet's in 2014 but hate to just pop them again suggestions

[PeterOnline]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Hi,

with F201 defect the VSUS is defect, I was assuming this has a relationship to the 5V SOS.

So you think I can replace F201 and the 16N55G as you assume the rootcause to be somewhere outside P board?

[tom66]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

5 blinks SOS: check panel for shorts, by unplugging C boards. If panel (PDP) shorted, cannot be repaired. If OK, then more likely main board (A board) than anything.

[PeterOnline]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Hi,

I had a 15V SOS as well. First I checked the F201/F301 and they were OK. Due to the postings I replaced the two TEA1611T plus caps on MC201 and MC301 and switched on the TV.

Now I get a 5V SOS...

I had a further look on the P-Board as well and found that the F201 is blown. So I checked the two 2x16N55G FETs below the board and one seems to be defect now (see marked area in attachment).

I'm little bit afraid just to exchange the 16N55G while the main issue is still there and to blow F201 and 16N55G again...

Does anybody have an idea what could happen to my ETX2MM704MG P-Board?

[tom66]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Great to hear! Enjoy your TV. Aside from the odd MC201/MC301 issue (and AC detect and loose LVDS cable, but much, much rarer), these are incredibly reliable sets and could easily live to 15~20 years no problem, very well built by Panasonic. Shame the newer ones aren't so well built .

[kendo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Thank you gentlemen, by replacing the cap on MC201/MC301 now the unit works like a charm, thank you again for your time and much appreciated.
cheers to all.
kendo

[tom66]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Could be cap on MC201/MC301. Can fail causing this -- recommend replacement at same time as replacing for 2 blink.

[kendo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Thanks again freakafter8, I found 2 FETs (16N55) both short cct, and blown 5A fuse.
replaced the faulty components. Now when I plug the power in the relay click but I have 10 blinks and missing 15v on plug6/pin7 even plug6 removed from socket still no 15v.

cheers
kendo

[freakaftr8]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

the only thing I can think of is possibly the 1mfd smd capacitors you purchased or one of the ics are unstable. Try swapping the caps temporarily with 1mfd electrolytic I beleve ground faces up. Double check google pics first.

[kendo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Thank you freakaftr8 for your quick reply, all soldering are solid hard, also the caps bought from a supplier here in Sydney Australia (SMD 1uF/50v).

cheers
kendo

[freakaftr8]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Are you sure the ics and caps are making a solid connection? Also what kind of cap did you use?

[kendo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

G'day

I have replaced the IC's & 1uF caps on MC201 & MC301, it worked for 3 days without any problem, but suddenly it shut down and standby LED started with 2 blinks again. Anything else to look for, any help will be appreciated.

[AznPersuasion]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

HERE IS THE FIX!

You must replace the IC's and 1uF capacitor on a couple different boards. There are what we call "IC packs" that regulate voltage for the A board and SC/SS boards. They stick up out of the PSU on green PCB's ... the labels are MC201 and MC301.

Here is a great video tutorial for the 704 board, but it still applies to yours.

[clark97]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

They aren't cheap but 99 times out of a hundred its mc301

[clark97]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

If the fans don't spin for a second when you power on you need to repair or replace mc201 and mc301.

[chevy56]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

Power supply part number ETX2MM702MF. Pickings are slim, pretty much every store I've looked at online once had them but is now out of stock. I have heard that these power supply boards are plagued with bad caps, but at least visually everything appears to be fine. Most are Nippon with a few Panasonics.

I'd like to get a pic of the back of the board but almost all the switching transistors are mounted to a metal back plate that works as a heat sink.

The error code given by the CPU is 15v SOS. I followed the basic troubleshooting steps that I found online which was basically to test pin 1 of the P7 connector for 15 VDC, which I did not get consistently. Sometimes not at all and sometimes only 1.5 V. From there the troubleshooting manual said replace the P board but nobody really has them. The D board is also possible, but only if the P board was actually generating 15 V and it was simply being incorrectly marked as outside tolerances for voltage or current. I'd like to test the PS without the 15V connection to any other boards to see if the PS is actually generating it, but if I unplug P7 the PS does not fire up as it has to be commanded by the D board. Other possibilities are any board with 15v is shorted or bad. (Pin 1 of P7 to ground measures 1500 Ohms on PS) Any ideas where to go from here? Startup sequence when the plug is initially plugged into the wall appears to complete without a problem, it's just when the set is turned on that it goes into SOS mode. I will try to get better and more pictures, but no obvious signs of heat damage or bulging caps anywhere.

TIA!

Chris

I just got through fixing a 50'' plasma and it seems to be alot like the 42.If its the same set up you can unplug A5 from the A board and then when you plug it in the wall you should get a white screen without even pressing the power button,mine did not so the A board was bad couldn't find one anywhere,I sent it to be repaired by moduslinktv,may have to put in search for right address,but that fixed my problem think they charged about $130

[fastvideo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

I have the exact same problem on a th46pz80.
Any one has a fix on these yet?
Or any one has the service manual to trouble shoot?

A defective D board found.

[Toasty]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

<snip>I have heard that these power supply boards are plagued with bad caps<snip>

Horsecrap. Don't believe it for a second.

The reason is your next statement-

Most are Nippon with a few Panasonics.

<snip>Other possibilities are any board with 15v is shorted or bad. <snip>

Not just -any-, but one in particular. You need to supply some voltage to the 15v inputs on the other boards to see which is drawing a lot of power. A 9v battery with an 1157 bulb in series like PlainBill said will show what's drawing the most. An ohmmeter check (analog please, DMM's numbers jump around too much) will likely show low resistance between ground and the 15v input on the suspect board. Find what boards need/use the 15v and go from there.

<snip>(Pin 1 of P7 to ground measures 1500 Ohms on PS)<snip>

Is that with the plug (P7) disconnected from the board? Plug it back in and see what the reading is then. Probes both ways with meters as diodes in the lines can give you a false reading.

Did this occur after a storm that would have had a nearby lightning strike or power surge?

Toast

[fastvideo]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

The error code given by the CPU is 15v SOS. I followed the basic troubleshooting steps that I found online which was basically to test pin 1 of the P7 connector for 15 VDC, which I did not get consistently. Sometimes not at all and sometimes only 1.5 V. From there the troubleshooting manual said replace the P board but nobody really has them. The D board is also possible, but only if the P board was actually generating 15 V and it was simply being incorrectly marked as outside tolerances for voltage or current. I'd like to test the PS without the 15V connection to any other boards to see if the PS is actually generating it, but if I unplug P7 the PS does not fire up as it has to be commanded by the D board. Other possibilities are any board with 15v is shorted or bad. (Pin 1 of P7 to ground measures 1500 Ohms on PS) Any ideas where to go from here? Startup sequence when the plug is initially plugged into the wall appears to complete without a problem, it's just when the set is turned on that it goes into SOS mode. I will try to get better and more pictures, but no obvious signs of heat damage or bulging caps anywhere.

TIA!

Chris

I have the exact same problem on a th46pz80.
Any one has a fix on these yet?
Or any one has the service manual to trouble shoot?

[waitery]

Re: Panasonic plasma TH-42PZ80U 2 blink 15v SOS

same problem here... replace the A board and D board and still have the problem... i dont wanna pay 150 for a power board... im sure they are always the same caps and resistances that get burned. but i dont know whichones

any ideas? have anyone solved this problem?
thanks
alex

If you turn on your set with all the boards in it and your fans do not kick over (start and then stop momentairily) with a 10 blink code, the likelihood is that the power supply is the cause. If I were you, I would stop buying boards and either repair the power supply or bite the bullet and replace it with a new/used functioning unit.