Panasonic plasma TH-42PZ80U 2 blink 15v SOS

[tom66]

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

They have slightly different part #s so I presume it's possible to put them the wrong way around and have it not work.

The modules generate the drive waveforms for the 16N55G's.

[jettboat]

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

thanks didn't have SM for schematic this one should be much easier than the "panny tnpa4782 issues" will test shortly

[vinceroger69]

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

are mc201 mc301 the same moduels could the previous repairer put them in wrong would this cause your fault? just thinking aloud here i dont know what these moduels are for.

[tom66]

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

SM:


Pins 15Vc in schematic for P board.

[jettboat]

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

Also I personally didn't replace the TEA1611T plus caps on MC201 and MC301, it was done by a student 3 quarters behind me that could not fix it, this is how I acquired the set
free

[jettboat]

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

Where should I be finding 15v tp ? Vscan did seem low to me. when the screen powers up the power supply gets loud like inverter under stress so I don't leave it on more than a few seconds last time the 16n55g blew this is my 3rd set

[tom66]

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

Vscan should be around 140V. Is 15V good? Vs @ 190V rated is quite low for this type of panel - I have ones at 198V and 207V.

[jettboat]

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

I got the 16n55g's in still same issue Vsus is @188v on the panel requires 190v, Ve is @144.5v panel 145v, Vda @ 142.9v Vset @ 321.8v Vscan -0.95 don't have SM to know the required V

[the_learner]

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

i did repair a tv like this 3 weeks ago.
at first i putt a bad smd cap in and it did the same. until i check with capacitor meter and saw witch caps was good i did not had a chance to fix it without knowing what cap to install there

Thanks dj. how did you check the caps?

I think 16N55G FETs may also be the culprit. So, I'm planning to change the FETs also.

[dj_ricoh]

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

jettboat, I've got two *702MF boards and none has any zener at ZD202.

I'm also struggling to get my 42PZ800A running having 10 blinks error. Changed the caps and ICs on MC201 & 301 after which it gave 2 LED blinks. No blown fuses. I thought I messed up something. So, bought another PSU from ebay which was pulled from a TV having 10 blinks error. I straight away installed to check and got the same 2 blinks error Though I have a service manual for the TV but I'm not an expert. So, any help will be appreciated.

i did repair a tv like this 3 weeks ago.
at first i putt a bad smd cap in and it did the same. until i check with capacitor meter and saw witch caps was good i did not had a chance to fix it without knowing what cap to install there

[tom66]

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

2 blinks on these is "early abort" of VSUS which is an odd one. In the service manual it say 15V. Basically you want to check VSUS while TV powers on. If VSUS doesn't rise then isolate SC and SS board (you may get 6,7,8 blinks.) If it still doesn't rise then you have a problem on the PSU.

2 blinks is generated by D board.

Basically PSU will turn on and work normally, but as soon as it sees VSUS is low, it wlll turn off 15V causing D board to sense low 15V.

Also, a short in 15V after the additional 15V rails switch on can cause 2 blinks.

[the_learner]

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

jettboat, I've got two *702MF boards and none has any zener at ZD202.

I'm also struggling to get my 42PZ800A running having 10 blinks error. Changed the caps and ICs on MC201 & 301 after which it gave 2 LED blinks. No blown fuses. I thought I messed up something. So, bought another PSU from ebay which was pulled from a TV having 10 blinks error. I straight away installed to check and got the same 2 blinks error Though I have a service manual for the TV but I'm not an expert. So, any help will be appreciated.

[tom66]

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

You could use a light bulb limiter when testing by cutting out F201 and putting a bulb in its place....

[jettboat]

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

looks like its not used from pic I've seen but someone desoldered the location for it back to the drawing board have the 16n55 in now to test some more

[tom66]

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

Just checked a spare *702 board of mine from a PZ80B and it has that zener missing too. Mine has 2 blinks but I never managed to get FETs going. Ended up finding a PSU with the common 10 blink fault, fixed that and used that in this set.

[jettboat]

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

Well think I found the issue with the 15v supply there's a zener diode missing on my ps @ location zd202 it is tied to the mc201 board that controls the switching for the 16n55's I keep blowing, Any one know the value or the color code its marked with? As its missing. The one that is next to mc301 is red & violet striped & the body is light purple in color. Was worked on by others apparently before I got it crap.

[jettboat]

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

I will got to get the new fet's yet to start over maybe ill order 4 for a backup set coming from Colorado 4 days or so

[tom66]

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

Check Vset and Vda, on SC and PSU respectively.

[jettboat]

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

Yes checked it even lowered by 2v to see if that would help was no change wondering if the driver ic is not operating properly may swap them to see if it changes

[tom66]

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

Did you check what the VSUS measured when it worked? Perhaps that was set too high.