[REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

[sultanpepper]

Hello everyone, I've had this for more than 20 years so it's quite sentimental. It was stored for a couple of years in storage and then we moved to another location and as you can see in the videos this was the surprise. I'm still trying to gather information and watch alot of videos to be as ready as
I can before opening the back as I am aware there are alot of hazardous areas back inside. BTW I've got the service manual.

The Problem :

TV is flickering and colours are not aligned (convergence issue ? ), not all input channels (composite/RCA) act the same and the Component Input acts differently I think. The video will speak a thousand words I'm sure.

Videos from each input channel

1- AV1 (Composite cable from a PS1 ):
https://www.youtube.com/watch?v=6lfxpImx8yE
2- AV2 (Composite cable from a PS1 ):
https://www.youtube.com/watch?v=LHWeE9C8_nE
3- AV3 (Composite cable from a PS1 ):
https://www.youtube.com/watch?v=x0LMW_M6MHc
4- DVD (Component cable from a OG Xbox ):
https://www.youtube.com/watch?v=FgS4MNPdFKM


TV Model : Panasonic Quintrix F TC-21P50R

I would really appreciate if any one would help me in sharing his/her thoughts on what are problems I'm having and where and how to fix them that would be really appreciated.

Background : I'm always looking to learn new things and in my free time I like to buy and fix broken stuff which is quite therapeutic.

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old CRT TV

Chroma system PAL60 , NTSC ?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old CRT TV

Chroma system PAL60 , NTSC ?

AFAIK It supports PAL60 and in picture settings there ( PAL, SECAM, NTSC4.43, NTSC3.58 & AUTO).

Where I live PAL was the standard format and our mains voltage is 220V 50 Hz.

Please let me know if you need more information

BR

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

please help

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Does your TV have a scart input

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Does the PS have an rf module included ?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Does your TV have a scart input

Sadly no.

The TV has:

1- 3 RCA (Composite) inputs at the back
2- 1 YPbPr (Component) input at the back
3- 1 RCA (Composite) input at the front
4- 1 S-video input at the front
5- 1 S-video input at the back

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Does the PS have an rf module included ?

Sadly no

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Are you satisfied with the video from the x-box on the component input?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Are you satisfied with the video from the x-box on the component input?

Actually no , the colors are shifted as you can see below

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Is the OSD image on the TV screen normal ?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Is the OSD image on the TV screen normal ?

yes the OSD TV settings menu look 10/10

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Have you tried connecting an xbox to a composite input RCA ?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Hello, Yes I've recorded OG Xbox on composite input RCA as well ,

1- AV1 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=2LLz_DR7gtM
2- AV2 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=5HdMMLGjWfA
3- AV3 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=OxAS3mfC-DU
4- DVD (Component cable from a OG Xbox ):
https://www.youtube.com/watch?v=FgS4MNPdFKM

[kasfamily]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Hello, Yes I've recorded OG Xbox on composite input RCA as well ,

1- AV1 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=2LLz_DR7gtM
2- AV2 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=5HdMMLGjWfA
3- AV3 (Composite cable from a OG Xbox ):
https://www.youtube.com/watch?v=OxAS3mfC-DU
4- DVD (Component cable from a OG Xbox ):
https://www.youtube.com/watch?v=FgS4MNPdFKM

Have you tried to change the color mode of the TV using the remote control?

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Have you tried to change the color mode of the TV using the remote control?

Hello , my apologies for the late response. I've uploaded a couple of photos for the Chassis PCB as per your request.







Also I've opened up the TV and took out the Chassis ( Main PCB ) and measured voltage rails and they are very low. Secondary all are very low and the main offline regulator IC I've measured it's Vin Supply and it's supposed to be 16V but its 12-13V and it's fluctuating. Please let me know if you have any ideas I'm at a road block

Note: Since I have the service manual, I've used the schematics as a guide but I spent an entire day pulling out suspected components and measuring them ( caps and diodes ) but nothing was out of the ordinary.... please help .....

BR

[R_J]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Start by replacing C811 47µf/50v, it is likey weak, I would also replace C826 47µf/160v as a precaution.

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Start by replacing C811 47µf/50v, it is likey weak, I would also replace C826 47µf/160v as a precaution.

thanks for the suggestion, I replaced those and alot more at critical areas. Still the same .

BR

[sultanpepper]

Re: [REPAIR] Help in diagnosing my Old Panasonic Quintrix F TC-21P50R CRT TV

Does the PS have an rf module included ?

I borrowed an old VCR and connected it to the RF input and the screen is showing same distorted picture .... any clue what that might mean when all inputs give bad screen ?

Also I've discovered that by hooking up the chassis board back to the crt the voltages readings were good; mainly voltages at the flyback IC were fine and at the secondary windings the voltage regulators outputs were fine as well.

I changed the vertical IC just for kicks but it did nothing .Also I tried recapping around the voltage regulators and the vertical IC .


BR