Panasonic TX-P42S10B

[noledud]

Re: Panasonic TX-P42S10B

using slides 27 and 28

DMM = ohms 20M

SU41 pin 2 to ground = 1.4 ohms

SD42 pin 9 to ground = 0.2 ohms

[tw2005]

Re: Panasonic TX-P42S10B

Oh, yeah definitely short cct but for a sanity check set meter to diode or continuity and confirm continuous beep indicating short cct

[noledud]

Re: Panasonic TX-P42S10B

yeah SU has continuity but the SD dont, thinking this is going to me uneconomical to repair

[DoubleDratt88]

Re: Panasonic TX-P42S10B

DMM = ohms 20M

SU41 pin 2 to ground = 1.4 ohms

SD42 pin 9 to ground = 0.2 ohms

If those readings are in meg-ohms then it could be ok?

Im going through a similar process on another model(s10a) with same 42 panel as this so alot will be similar.

My pins varied from printed guides for other models so check your manuals for your models pins to be sure VSCN-F etc are on the pins they should be.

Long story short, at SU41:
VSCN-F 220k ohms is near enough to normal according to the manuals I have - IF that was the 0.2 in meg ohms you read at SU41? and vfo was 1.5m?

Expected approx readings(from 2010_FHD_Plasma_TV_G25_Series_Troubleshooting_Handbook.pdf):
VFO 2.2m
VSCN-F 221k
5V_F 5.7m
and from another guide:
VFO 1.9m
VSCN-F 220k
5V_F 6.3m

Vfo was more interesting.
With Black to VF_GND and Red to VSCN-F measuring point i get 6.2-7.5mohm on 20m resistance scale and no contunuity on diode check or continuity beep settings.
With Red to VF_GND and black to test point i get no reading on any resistance scale(not oL, just open). However with meter set to diode test i do get a reading of 1.0x - on continuity beep setting i get nothing.

The schematics i have for my s10a chassis are missing the SC/SU boards so have to assume with the leads switched the path taken by the supplied current from the dmm is passing through a diode or transistor etc or both, and the positive diode reading is possibly a good sign. As i mentioned on continuity beep setting- i get nothing.
Some patience was needed on measuring the m-ohm readings as they took a while to get a stable number too.
All taken with SC board removed and SU SD ribbon disconnected etc.


I'm not 100% sure what all this means yet but I was fairly confident before reading this that my su/sd boards are ok after checking the various isolation procedures, despite some of the numbers being a bit off the guide they are stil in the mohm range and far from dead shorted.
Also i'm still testing for certainty and wouldn't say i was 100% sure of anything at this stage. If i had my tv working after all this i might be more certain but it will be a couple of weeks before i finish diddling with the sc board and replacement parts etc and find out. fwiw i have not posted yet about my issues but plan to start a thread sometime with my notes on journeys with similar problems but they are looking to be the same as folks in this thread:

https://www.badcaps.net/forum/showth...t=27921&page=1

Your situation may be different but these panels do seem to be tossing out similar SC issues on various models from the searching ive done lately and i noticed your numbers look suspiciously close to the expected values from the pana guide if they were taken on 20m range. *or in tw2005's post # 58 in this thread: https://www.badcaps.net/forum/showth...t=26322&page=3

Goodluck, hope this helps and sorry if it wasted your time :-)

[noledud]

Re: Panasonic TX-P42S10B

hi sorry for the long delay after discovering i might have a bad buffer as well i put this on the back burner hoping i could get a donor still not found one so going to have a bash if you all agree this possibly could be repaid in the light of what DoubleDratt88 said about the buffer possibly being ok

[tw2005]

Re: Panasonic TX-P42S10B

hi sorry for the long delay after discovering i might have a bad buffer as well i put this on the back burner hoping i could get a donor still not found one so going to have a bash if you all agree this possibly could be repaid in the light of what DoubleDratt88 said about the buffer possibly being ok

what do you mean repaid?

[noledud]

Re: Panasonic TX-P42S10B

lol repaird

[noledud]

Re: Panasonic TX-P42S10B

hi all found a poss tv with bad panel - does anyone happen to know which compatible models should use the same boards ?

[noledud]

Re: Panasonic TX-P42S10B

any one know ?

[tw2005]

Re: Panasonic TX-P42S10B

I was thinking U10B & S11B but you'd have to check if these were UK market. Would not it be just as easy if you just looked up the model in question and track down the manual to find the SC part number to work it out or search the model in FlatTV parts and see what boards come up?

[noledud]

Re: Panasonic TX-P42S10B

yeah your right me being thick cheers tw2005 iv sorted it now

[noledud]

Re: Panasonic TX-P42S10B

ok cant find a board so going to try the repair on this one

it TNPA4829 AD TXNSC11XBH42

is there a kit i can buy with everything or has anyone got a list of parts and where i can get them in the uk ?

[tw2005]

Re: Panasonic TX-P42S10B

Post 16 has some part numbers. what can't you work out?

There's a couple of guys who had some success, including one repair shop in that post. Maybe send them a PM and they may have some tips especially the repair guy as he may be able to assist with the parts .

[noledud]

Re: Panasonic TX-P42S10B

what are mine of D622,Q401 i cant see them in the list ?

the tv was missing them when i got it so i have no idea

[tw2005]

Re: Panasonic TX-P42S10B

You have the service manual for the parts list?

D16622 B0FBCN000006 = RF2001TM3SW, by ROHM. Same as D621, check that marking.

Q16401 2PG0110000RP = 2PG011, by Panasonic, Same as Q402 if you have that one still fitted.

[noledud]

Re: Panasonic TX-P42S10B

just found all the boards for £63 to my door, the parts just for SC were 25 +

so when everything arrives i can compare buffers to confirm if mine are bad and send back what i dont need

[noledud]

Re: Panasonic TX-P42S10B

received parts fitted and now it does nothing

if i disconnect the 3 ribbions on the main the set powers up with all LEDs on SC etc lit and standby green just no pic

its as soon as i connect the main board ribbons nothing happens when powered not even a red flashing standby

any suggestions while i check for voltages

[tw2005]

Re: Panasonic TX-P42S10B

you got me on this one. You had 7 blinks, starts ok with A and PSU alone, now nothing with it all hooked up. Take a stab and hook everything except SC20 ribbon. Can you post a good picture of everything in one shot from the back for a look.

This TV is jinxed it seems.

[noledud]

Re: Panasonic TX-P42S10B

ok will post pic in a min phone is charging

have i tested the a and ps alone dont think i have, how do i best check the A ?

[tw2005]

Re: Panasonic TX-P42S10B

ok will post pic in a min phone is charging

have i tested the a and ps alone dont think i have, how do i best check the A ?

maybe not. I made suggestion in post 13, you came back and confirmed PSU was ok.

I guess I took that as you had also tried the PSU/A board only.

Other reason suggesting this was to be sure nothing else was going to bite you on the bum.