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Master thread for Panasonic plasma not turning on - Page 43

post #1261 of 1980
Quote:
Originally Posted by vttree View Post

TV is Panasonic TH-42pz85U with 11 blink code ... With the back panel removed the TV works every time ... With the back panel on the TV fails to work each and every time.

Somehow, the back panel is restricting the operation of the fans. It only takes one slow fan to shut down the TV with 11 blinks.

Others here have solved the problem by either vacuuming or blowing out the dust from the fans.
post #1262 of 1980
Quote:
Originally Posted by vttree View Post

Hi, This is my first post. Forgive me if I have made any errors in format.

TV is Panasonic TH-42pz85U with 11 blink code. It won't turn on for more than 3 seconds after unpluging it. I have read many of the posts here to learn more about my problem as well as other similar problems. I have done some troubleshooting and discovered the following.

With the back panel removed the TV works every time. (3 in a row so far)
With the back panel on the TV fails to work each and every time. (11 blink code) I have tried this many times with many variables. Like plugging directly into the wall or power strip. Different inputs and no inputs. All failed with 11 blink code. I was able to observe one time that all 5 fans failed to start or even move a little with the back panel on the TV. I only observed this once and do not know if this was happening or not on all other failures. The fans do move freely and operate normally with the rear panel off. I have looked to see if there is any binding or pinching when the panel goes on and all looks OK.

If this is a faulty PB board (fan controller board) then why would it fail only when the panel is on the TV? Should I replace this board and hope my problem goes away? I can't see why it should. If I replace the PB board (TNPA4243AH) are the last two letters (AH) important to match?

This TV is a little over 2 years old and no warantee. The manufacture date is February 2008. I bought the TV new and it has never been moved until I started trouble shooting.

Thank You for your help.

This should help with troubleshooting

http://www.scribd.com/doc/46124232/T...GPH11DU-Chasis
post #1263 of 1980
OK everyone. Well here is another one.

Same story as the rest of the 10 blinking code. Went to turn on TV- nothing but the reoccuring 10 blinker.
6 months passed warranty- so no one coming to my rescue.

Called Panasonic- created a case file, they gave me a list of shops in my area. took the 50" Plasma to a local Panasonic fix it shop. Got a call back after a week & they told me it was the SS board. Total $ parts & labor, just under $500 when the part comes in. They have no idea when that will be. I'm really starting to question my loyalty with the Panasonic name.

Does firmware need to be run on this model so this doesn't happen again?
post #1264 of 1980
Gents,

Another Panasonic failure for the list. Mine is a 2008 model 58PZ800U. One year out of warranty if course.

My wife says that she turned the TV on and moments later she heard a pop and the TV went off. When I looked, the LED was blinking 4 times. Pressing the power button did nothing.
I googled it and it looks like the 4 blink symptom is for the P board (power supply). The 58" has a double board power supply that is avaialble for ~ $100. I'm not averse replacing the whole board but I'd like to fix it of possible.

The service manual people keep referring too does not include the 58PZ800U it stops at the 50. Does anyone have access to a 58" service manual that covers my TV?
I see some company on the net offering it for download but I don't know anything about them to give them my CC number. or Paypal for that matter.

I have pulled the power supply (etx2mm706nga) and inspected all of the capacitors. The output voltage ones (220V 300uF) have the tops bulged up a little but not leaking or looking like they "Popped" I took them to work and the all measured in spec for uF and held 200VDC with little leakage. ESR may have shifted but I think they're OK for now.

All of the fuses on both boards are OK.

Poping is usually a capacitor so I looked at every cap and did some upclose sniffing of them to see if I could smell the magic smoke. The only ones that look suspicious with a slight bulge and a very faint smell were the 220V 900uF caps I tested.

now I'm going to put the supply back together and start probing voltages to see if I can get a clue. (should have done that first).

I want to be sure that the P board is truely bad before i buy a new one.

I will also check that small 603 u1F cap. Its odd for these types of caps to fail but they can due to soldering cracks. I don't think they would make a pop like my wife heard but she may have been hearing the relays clicking.


Has anyone found a schematic for the power supply? etx2mm706nga

thanks for any input you can give.
post #1265 of 1980
Quote:
Originally Posted by mook_johnson View Post

The service manual people keep referring too does not include the 58PZ800U it stops at the 50. Does anyone have access to a 58" service manual that covers my TV?

The service manual for your Panasonic TH-58PZ800U can be found free here.
post #1266 of 1980
AWSOME!!!!. Thanks Tomwil.
post #1267 of 1980
[quote=IRISH-SPAWN;21348274]OK everyone. Well here is another one.

Same story as the rest of the 10 blinking code. Went to turn on TV- nothing but the reoccuring 10 blinker.
6 months passed warranty- so no one coming to my rescue.

Called Panasonic- created a case file, they gave me a list of shops in my area. took the 50" Plasma to a local Panasonic fix it shop. Got a call back after a week & they told me it was the SC board. Total $ parts & labor, just under $500 when the part comes in. They have no idea when that will be. I'm really starting to question my loyalty with the Panasonic name.

Does firmware need to be run on this model so this doesn't happen again?They didn't really say.
post #1268 of 1980
Want to give a big thanks to kdh05 for his solution.

I had a Vizio VP504 FHDTV10A that would not power up past standby. Plug the unit in and the relays clicked, but the Vizio LED would stay orange and even grow dim. Bought a replacement ETXMM704MGN board (same as a panny) and swapped for a fix.

Sold the TV about a month after that- no use in between other than to take pics and test all inputs- and went to power it on.... right back to square one. Obviously the replacement board I had suffered the same failure.

Found this page, read a bit, and found kdh05's solution.

I pulled out my ESR meter and tested the SMD capacitor on M301- tested @ 1.3uf and .85uf depending on test lead orientation. Same with the module at M201. HOWEVER.... I heard a slight buzz from the surrounding components while testing them, moreso at M301 then M201, but there at both tests.

I de-soldered M301 first- no buzz after it was removed (testing M201 while in board still as well). Found a 1u SMD capacitor on a parts board from another TV and replaced the bad one. Note, this was after 8 tries- ESR is different out of a circuit than on.

Crossed my fingers and re-soldered M301 back on the board. Tested with ESR meter and found the same results.... except NO BUZZ!!!

Popped the fixed power supply back into the TV and had glorious life!!

I felt the need to join the forum and post my results and a big thanks to kdh05 for his work.
post #1269 of 1980
OK I replaced my Power supply and D board and still same problem.

Plug in..no blinks. relays click once then again after 5-10 seconds.

Push the power button, clicks, fans start to turn the the unit turns off. Two blinks. The SM says D board 15V SOS but I already replaced the D board.

I read somewhere that if oyu hold the power button for 10 seconds a second blink code will appear. Mince changes from a 2 blink to a 10 blink. What does holding the power button in do?

I did a very close inspection of the orignal power supply and there are not obvious blown parts or domed caps. Probed around across supply rails with the ohm meter and nothing shorted.

Does anyone know if the Repair guide for the 42PZ80U - 50PZ800U apply to the 58PZ800U? I googled around and can't find another version for the 58". This is the Technical Guide/Troubleshooting handbook not the Service manual. I have the service manual with the shematics. I'm looking for something to navigate me through what the blinking lights mean.
post #1270 of 1980
I think it does apply. You have nothing to lose by doing the test. Don't know if this will help but here is another one.

http://www.scribd.com/doc/24963802/1...Plasma-Display
post #1271 of 1980
Started to go last fall. Had to unplug it for up to a day so it would work again. Finally, this week, it will not turn on even if unplugged for several days.
TH 50PZ85U.
10 blinks.
Mfg date: May 2008
Purchased: Future Shop, Waterloo, Ontario
I checked and I have no active warranty on this.

Three year old tv...broken...crap...but I will try to fix.
post #1272 of 1980
I have a TH-50PZ800U (purchased October 2008) with no issues so far but have been trying to determine if there is a way to prevent failure if possible.

The TV is currently connected to HDMI #1 directly to the AVR (Yamaha RX-A700) and I have also connected it to the cable box via Component (in order to watch cable while listening to music- only works intermittently, probably a cable box problem). The cable box is also connected to the AVR via HDMI#1 .

My computer (ATI Radeon HD 4850) is connected to the AVR on HDMI #3 (this setup causes my computer screen to flicker {and the computer tones indicating a unit has been plugged in} whenever TV or AVR are turned on or off -have not yet found a solution or cause) and this situation has also caused me some worry.

Is there anything I can do to prevent a problem with this TV? Should I connect the HDMI® Active Equalizer Extender Repeater (monoprice.com/products/product.asp?c_id=104&cp_id=10419&cs_id=1041907&p_id=2849&seq=1&format=1#largeimage) as suggested previously in this thread?

Also, should I disconnect my computer except for times I wish to use it, or is there another way to prevent the flicker issues from happening?

Thanks for any comments or suggestions.
post #1273 of 1980
I don't think there is any preventative maintenance because you don't know what will fail.

You can look at the capacitors but that is not a cheap deal. The large caps are $5-6 each and there are quite a few. Typical with most commercial stuff they do run the voltages very close to the cap rating. (189V on a 220V cap and 400V on a 450V cap) A bit close for my comfort but I guess it works. I'm a EE board designer but for products that need reliability more than a price target.

Best thing you can do is find and download the manuals so at least you'll have some information if it goes out early. If its over 6-7 years old it might be cheaper/wiser to get a new one. I would really suck to fix it and have it go out again in 6 months and have to go through all that mess again.
post #1274 of 1980
Made some progress. I bought a new P board (two boards) and a new D board from shopjimmy and they didn't change a thing.

No blinks on plug in, relay click, then click again after about 10-15 seconds. From the other manual it says that the boards are checking basic power up during that first 15 seconds after plug in. If there is a problem with the voltages, it will give a 10 blink before you press the power button. If no blink before you press the power button it passed those basic checks.

Mine was no blinks with my boards or the new ones.

Press the power button the fans kickover for a second then turn off and I get 2 blinks. I followed the flow charts and it points to the D board (no shorts on the 15V). But it s NEW D BOARD!. Checked the 10 blink troubleshooting guide and it said to disconnect the SC board connectors from the Vsus (189V) and the ribbon cable from the D board.

With these connectors unlugged (SC2 and SC20) the LED would turn on solid and the fans would spin. PROGRESS!

It looks like the SC board is bad. To be safe I've going to replace the SC, SU and SD boards to make sure I have everything covered. I saw a youtube video about a guy the replaces only the SC card and it turned out that his SU card was shorting and taking out his SC card. Of course it took out his new SC card.

Don't want to repeat that fiasco.

It is really churning my stomach that my $3000 TV dies after only 3 years. That only feelgood is that if I did get a 3 year extended warranty, I'd be out about 400 bucks and still SOL.

Wish me luck.
post #1275 of 1980
I have a p50g10 with 7 blinks. It was plugged into a surge protector, no power surges, tv just wouldn't turn on and got the 7 blinks. Went through the troubleshooting diagram, power board is good, SC board is toast. It has burn marks at the connections of almost all the transistors and caps but none of the caps are bulged. I have a new board from ebay, but I don't want to install it until I figure out what toasted the old one. From what i've read of the 42 inch series of pannys, new boards and a firmware update fixed the issue. I haven't found any mention of a firmware update for any of the 50 inch series on here or pannys website. Anyone have any idea how to keep the tv from frying another board?
post #1276 of 1980
Hmmm... That sounds peculiar. Can you post a picture of the burn marks? Or, if possible, list which transistors/caps have the marks? The diagnostic blinks are not fully accurate, and may be diagnosing an SC failure first, while the P-board also fails but the scan ends before it is detected.
Another option might be to 'pretend' it is a P-board failure, and go through the debugging flow to check all the voltages. If something in the power board burned the SC board, it would likely show up there.
post #1277 of 1980
Update:

I've pulled the SC board and probed around it it and while the board looks perfect with not bulged or blown capacitors there are several IGBTs and Mosfets that are dead short D-S or C-E.

I found it by measuring fro VF_GND to chassis (mounting screw) it should be in the Kohms range but nine was 80 ohms. Probe..Probe...probe and found a Big to-247 IGBT shorted in the VF_GND line. Lifted its lead and still shorted. Then found a cluster of 4 transistors blown (IGBTS all in parallel with emitters tied to chassis). Lifted those leads and the short disappeared and the resistance between VF_GND and chassis went up to ~10K.

Now, why these transistors blow.....don't know. none of the caps are shorted and they all show capacitance on the Multimeter.

My failure shortly after turnon so I doubt it was a heat related issue.

I'm still going to replace the power supply, SC, SU and SD boards and be done with it. If it fails in less than 3 years down the road from this repair, Ill put a hammer to it.
post #1278 of 1980
Why can't I post my message?
post #1279 of 1980
Here we go again. Came here last time to lurk and read. That was in 8/08.
Purchased 12/07, first 7 blink 8/08, under warranty, so panny fixed. No ext. warranty purchased on my part unfortunately. They somehow had to replace a lot. Power supply, SC, and panel, etc. ? . It was down over a month. They took it to their shop after two home visits. It took over a month at least to get it back up and operational again. I recall verifying they did update firmware, he said specifically the software affected the power supply and should prevent this re occurrence. TV repair held up till now 12/11. Haven't called them yet but geeee, this set is waaay out of warranty. It's now 4 years old. Anyone have any success with Panny helping out in anyway with a set this far out of warranty? I love this set, especially after reading a lot of the post about the ST30's I have my eye on, and others. It seems every company and every model has issues. I never had any issues except complete failure. I'm not sure which is worse. A bad or compromised picture/pitiful sound/HDMI incompatibilities/AVR issues/etc,etc. However, currently I'm poor, and the situation won't improve cash wise till Feb. So I will call Panny just to see what they say. I'm more than able to open TV, pull a few boards, and replace, albeit with AVS guidance.

What I'm looking for is the flow chart/diagram which I read and can't find again that details the procedure in which you pull SD,observe panel, pull SU, observe panel, and conclude which board or boards are dead. It was at least "cleaned up" and posted by "Jkolk23" I've read a lot of times on my model it's only the SC board that is bad. Would someone be so kind to link me. I thought I booked marked that page , but apparently my browser marked page 1 of 45/?.

Regarding the board removal and such. What was not obvious to me in the procedure was do you turn off/pull power cord at each step? What am I looking for the panel to do when pull SU, SD. And how again do I know it's the SC? Because if after pulling SU no screen light? because after pulling SD, no screen light? That's it, it almost sounds to simple. I should get in this business. Some mention dissipating capacitors each time. How is this done. I do have an "A' light bulb. Across TP1 & TP2, is this ac power cord black and white? I'm a great mechanical engineer ,I just need step by step instruction regarding electrical.

So if one is not going to repair their plasma, what does one do with it? Post here to sell it/parts? Post eBay/etc parts? Sell the whole thing to whom?

Sorry for the rant and long post I thought I'd get it out all at once.

Thanks so much. You all are a wonderful resource for so many. For the 1 that posts, I feel you all have 20 that lurk.
post #1280 of 1980
Quote:
Originally Posted by ARBEAR View Post

What I'm looking for is the flow chart/diagram which I read and can't find again that details the procedure in which you pull SD,observe panel, pull SU, observe panel, and conclude which board or boards are dead. It was at least "cleaned up" and posted by "Jkolk23" I've read a lot of times on my model it's only the SC board that is bad. Would someone be so kind to link me. I thought I booked marked that page , but apparently my browser marked page 1 of 45/?.

The post you refer to is here.

The technical manuals you mention are located here and here.
post #1281 of 1980
Hello all

I have a TH-42PHD8UK Panasonic commercial display and have the blinking red light power off problem.

Turning it on I get green light for a few seconds, then one long red blink followed by 5 short red blinks.

I have had this unit repaired once before with similar problem but think that one was total of 7 blinks and they replaced power supply.

Could this be the fan problem? I was thinking of openng up the back to see before taking to service center. I don't even hear any fans starting up when I turn it on. Should I be able to hear or see fans working without taking off rear panel?

I live in Mexico, any help most appreciated.
post #1282 of 1980
tomwil
Thanks so much. I knew I read/saw them here. Your awesome.
Will begin diagnostics.
post #1283 of 1980
Quote:
Originally Posted by pgapromex View Post

Hello all

I have a TH-42PHD8UK Panasonic commercial display and have the blinking red light power off problem.

Turning it on I get green light for a few seconds, then one long red blink followed by 5 short red blinks.

I have had this unit repaired once before with similar problem but think that one was total of 7 blinks and they replaced power supply.

Could this be the fan problem? I was thinking of openng up the back to see before taking to service center. I don't even hear any fans starting up when I turn it on. Should I be able to hear or see fans working without taking off rear panel?

I live in Mexico, any help most appreciated.

ok I have 2 out of 3 fans not working, tried to vacum off dust but they still don't work. Anyone know part number and cost for fans for a Panasonic TH-42PHD8UK (manufactured February 2006) Where can I buy them?
post #1284 of 1980
Last Update:

I took the holidays off and had fun out of state and away form the TV. Got back today and installed the new SC and SD/SU boards and that was the ticket. Screen powered up and played a blueray DVD without problem.

I didn't have a scope on me to set the pot that controls the 250V fall on the SC board signal (I forget the name) so I just measured the resistance of the VR600 and VR602 pots (they're rigged as variable resistors) and set the new board to those same resistance readings. It was very close anyway and the adjustments were very touchy so I don't think it matters much. I might have moved the pot 1 degree to get it to match the readings of the other board dead nuts on. (probably not necessary but I didn't want any problems)

I used Shopjimmy.com for all my parts and they had excellent service and quality of parts. They do match prices so you can find the same part on the internet (excluding ebay/craigslist) that has a 3 month warranty on their parts or longer, they will match the price.


Thanks guys for all the input! Nice to have that behind me. Also not too concerned if it fails again since I'm familiar with the guts of this guy now.
post #1285 of 1980
Quote:
Originally Posted by pgapromex View Post

ok I have 2 out of 3 fans not working, tried to vacum off dust but they still don't work. Anyone know part number and cost for fans for a Panasonic TH-42PHD8UK (manufactured February 2006) Where can I buy them?

Are the fans getting power? Get a meter and see if the fans have continuity through them (should measure some low resistance value). Comapre a "bad" one to the good one. You wil have to look at the wireing code but the red and black are usually power and ground and the third wire is a tacometer to report what speed the fan is turning.


If the all measure the same, check that there is voltage available at the fans connector.

You might try swapping the fan connectors and see if it works on a different outlet.

Give shopjimmy.com a look for replacement fans. Ebay is another spot.


Usual Disclaimer!!!!!

There are several circuits with hundreads of voltage running around the electronics in a plasma TV. If you don't understand electronics don't mess with the TV with the power cord plugged in. Even if you unplug it let is discharge for a hour or so to allow the residual chanrge on the caps to dissipate. That is one thing I noticed about Panasonics schematics is that there are no discharge resistors on the bulk storage capacitors so the voltage can linger on them for a long time.
post #1286 of 1980
I purchased a Panasonic 42" viera plasma (TH-P42V20A) on the 5/01/2011 and just had the thing die on me yesteray after removing an HDMI cable from the side HDMI-4 slot. Mine is giving me the 4-flashing-lights-of death so in otherwords one of the power boards has failed as per info provided on this forum and other useful websites like "panasonicplasmafail"

Lucky for me I still have ONE days warranty left on it though I was starting to freak out when I couldn't find my receipt but finally it appeared. I'm amazed at the number of people who are reporting such a catastrophic failure to their expensive plasmas especially for a brand that is regarded as a leader in plasma tv's...its not like we bought a Soniq or some generic plasma tv! I believe there should have definitely been a recall of some soughts as you can imagine the number of failures reported to Panasonic that haven't made it on to the web. Maybe I should've gone for the 50" after all?
post #1287 of 1980
Just a follow up in case this helps anyone. I was getting NO flashes. Unit would power on, but only have a black level screen. No menus either.

Ended up replacing the main board for about $50 and it works beautifully. These units are VERY easy to work on, took maybe 30 minutes to complete. Got the board from discount-merchants.com
post #1288 of 1980
Quote:
Originally Posted by mumblyp View Post

Can anyone link me to technical trouble shooting guide or service repair manuals for the 50VT20? I've noticed it may have differences from the other plasmas.

http://elektrotanya.com/?q=showresul...oria=&kat2=all
post #1289 of 1980
Quote:
Originally Posted by pgapromex View Post

ok I have 2 out of 3 fans not working, tried to vacum off dust but they still don't work. Anyone know part number and cost for fans for a Panasonic TH-42PHD8UK (manufactured February 2006) Where can I buy them?

Panasonic PN# is

L6FAKEDH0010

TH37PHD8UK uses the same fan if you find a junker.

Pana-Parts : 800-332-5368

T Wiz
post #1290 of 1980
Had my 42 inch PZ77U doing a 7 blinks of death a few days ago. Purchased at the end of 2007 so it is way out of warranty. And it is very lightly used.

Contacted Panasonic concierge via Web Chat and they scheduled and dispatched over a tech. to service and replace the defective board/ upgraded the firmware to prevent future outages of this newly replaced board. (per him, the board is identical to the one replaced but the fix is actually in the firmware). It took about 1/2 hour of work.

It was all done free of charge. I am very impressed with the way Panasonic has taken care of this problem. The set is as good as new. I am very happy with the service and the TV.
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