A guide to fixing/troubleshooting some common plasma TV problems

[Robb]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Hey, I got a 42MF231D/37 and the Y Sustain Board has, at least, a bunch of burnt resistors and the Lower Y Buffer has a bad IC chip, too. Does anyone know what components usually go bad on the Y Sustain Boards on these models and how to test them?

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Range should be 1000V/750V. Set to DC mode. (AC is squiggle, DC is one broken bar and one solid bar.)
Red probe on TPVAD/TPVSCN black probe on the metal chassis of the TV.

TPVSCN reads 42V on both sides...TPVAD on on connection 187V..on other where the cap is reads 0V on bottom..and on top of the cap reads 187V! is that ok now ?

picture is here...

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Is your VAD positive or negative? If your Vscn measures like that, I think there is a problem with the SN board you have.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

this is what i get ....

im sry...the pictures are upside down :S ...but you can see that i get all negative measures !

[Mrpuding]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Hello everyone my name is Chris I'm new to the community and would like to request some help. I was wondering if you could help me with fixing my TVs. I have two TV's that I have acquired. One is a Samsung HPS4253 that is having a guess you would call it a Blue Sparkle problem. When you first turn the TV on and there's no component currently on and it's the blue screen there's static in the corners of the TV. After a while of use I start to get this blue sparkle (maybe blue snow) effect. In the corners of the TV. If I turn the TV off and turn it back on the Blue Sparkle is gone. It seems to only happen when the TV has heated up for awhile and has been used for awhile. The time period of use where this Blue Sparkle happens does vary. I was wondering if you could help me finding a solution. The other TV I have is a RCA 42PA30RQ which will not turn on. When you turn it on the blue Light comes on in the front and you hear a clicking three times. I've taken the back cover off and have disconnected the Y-Main and Z-Main to see if the clicking would stop. When I disconnect the two boards, instead of it clicking three times the clicking goes down to one. I really would like your help in trying to find the problems to this TV to get them in working order.

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Chris, both your problems should be put in separate threads.

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

this is what i get ....

im sry...the pictures are upside down :S ...but you can see that i get all negative measures !

It looks like either your SN is defective or the AC is not an acceptable sub for AB.

[Mrpuding]

Re: A guide to fixing/troubleshooting some common plasma TV problems

I'm sorry for putting two questions into one post. Forgive me I'm new to the community. I would really like help with the Samsung HPS4253 that is having a guess you would call it a Blue Sparkle problem. When you first turn the TV on and there's no component currently on and it’s the blue screen there's static in the corners of the TV. Then when I turn on a source the picture is fine. After a while of use I start to get this blue sparkle (maybe blue snow) effect. In the corners of the TV. If I turn the TV off and turn it back on the Blue Sparkle is gone. It seems to only happen when the TV has heated up for awhile and has been used for awhile. The time period of use where this Blue Sparkle happens does vary.

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Again, this question MUST be in a separate thread as someone else is being helped in this thread. Create a new thread in troubleshooting TVs & video sources.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

tom,i got this answer from a technician where i bought the SN board

there is a adjustment called a VS adjustment it would be on the power board . Most of the time they write it on a tag on the inside of the panel on a tag or something like 187volts. if you dont have a meter and stuff , you find this adjustment and adjust it with a small screw driver till the distortion clears. WARNING the power supply is on, so do shock yourself.

now i have three screws on my power board,could you pls tell me which one should i try to adjust...all three are plastic..one has vsus marked near him,other vda,and one pfc ! i guess i should adjust vsus,right ? btw. he is the only one that is glued by some kind of sillicone!

thx for all your advices...and patience with me !

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Vsus, yes.
Do NOT adjust Vda under ANY circumstances - over-voltage is instant death to your plasma panel!
These panels may or may not have Vsus written on the tag.
I highly doubt Vsus is causing your issue, especially if the panel was working before your original SN died.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

you were right...i tried to adjust the vsus...but i only get a brighter or darker picture,the colors stay the same and the picture is still grainy !:/

ill just try to get this part RMA...and i hope ill get another one! i tied everything...nothing worked!

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Try to fit an AB part instead of AC, too. I'm not 100% it is a proper substitute.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

ill try..but the main problem is ...that there arent many TX-p42x20e models and substitute parts for taht model of tv...it seems it that that model was sold in Europe much more than in USA,and other countries!

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

E=Europe, U=USA/Canada
Not sure how you got that in US?.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

im not from US...im from Croatia,Europe!

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Uh. Ignore me, I misread your post.

[MeanBoss]

Re: A guide to fixing/troubleshooting some common plasma TV problems

never mind.its all ok,i tought that my bad english will expose me !:P

im looking for TNPA5066AB all over net...but i just cant find it ! all out of stock ;\

[tom66]

Re: A guide to fixing/troubleshooting some common plasma TV problems

Consider using the board from the British version TX-P42X20B, as British standard usually very similar to EU standard. Not sure what variant it will be.

[senz_90]

Re: A guide to fixing/troubleshooting some common plasma TV problems

very well thread im interest to learn repair lcd tv that become popular in this decade.. but didn't know who wanna teach me.. this is a very very good explanation. someone wanna teach me willingly? hahaha..maybe i have to migrate to the europe or USA to learn from you everyone..