Pc43f4500

[sordids999]

hello guys

another tv im looking trying to fix

to the left of the screen in the middle im getting mal-charge a small line of red-green speckles and sometimes top left a batch of green speckles,the tv keeps restarting i was told by the previous owner but she only was using aerial connection(which i dont use) but i have tried scart and hdmi nothing yet
i have uploaded pictures in the service mode via SVC and i have loads of failures

my readings are the following:

VS 205 Volts
VA 56 Volts
VSCAN -187 Volts
SVT_VS 205 Volts
SVT_XOUT 81.6 Volts

legend readings on PSU

PIN 1 : 15V 15.1 Volts
PIN 2 : GND
PIN 3 : OUT-A 79.1 Volts
PIN 4 : OUT-A 79.1 Volts
PIN 5 : OUT-A 79.1 Volts
PIN 6 : VS 205 Volts

PIN 1 XS 0.0 Volts
PIN 2 DRV_RESET 0.04 Volts
PIN 3 XG 0.67 Volts
PIN 4 VS_S SIGNAL 1.53 Volts
PIN 5 DS_RESET 0.04 Volts
PIN 6 VS_ON 3.23 Volts
PIN 7 GND
PIN 8 GND
PIN 9 5.3=5.16 Volts
PIN 10 5.3=5.16 Volts
PIN 11 VA 57.8 Volts
PIN 12 VA 57.8 Volts
PIN 13 GND
PIN 14 STBY=5.20 Volts
PIN 15 PS_ON 0.03 Volts
PIN 16 15.0=15.39 Volts
PIN 17 GND
PIN 18 5.3=5.19 Volts
PIN 19 5.3=5.19 Volts
PIN 20 5.3=5.19 Volts
PIN 21 GND
PIN 22 15.0=15.39 Volts

[tom66]

Re: Pc43f4500

Can you upload a photo of the full screen showing the defect? On a picture or normal TV (try using Self Diagnosis feature in user menu)

[sordids999]

Re: Pc43f4500

https://www.youtube.com/watch?v=B12h3q2MiCs

hope you can see this video with the fault tom becuase it goes after 5 mins roughly with just a slight line of pixels showing

[tom66]

Re: Pc43f4500

That's an odd fault not seen that before, would be tempted to suggest Y-buffer (or Y-main - all in one board)

As for the FAILUREs, have you tried a factory reset?

[sordids999]

Re: Pc43f4500

tried a factory reset but still getting the failures

[sordids999]

Re: Pc43f4500

tom if i turn down the Vscan pot down so the voltage measures -181 but on the panel it should be -190 would this matter because the mal-charge is gone at -181 ?

[tom66]

Re: Pc43f4500

It should be fine; that's not the first time I've seen a Samsung with maldischarge issues despite being very new. But, I would try lowering Vs a few volts (max 5V), and see if you can set Vscan back to factory, or you may see other effects on the image.

[tom66]

Re: Pc43f4500

The failures -may- be normal; it could simply mean they haven't been tested yet. I'd check everything else seems to be working. I seem to recall that most Samsung show "T-con USB download: Failure", regardless of fault.

[sordids999]

Re: Pc43f4500

ok set VS to 198 volts but Vscan is still -181 volts but images look ok at the moment

[tom66]

Re: Pc43f4500

198 is a little low you might get issues on high brightness. Make sure you get no pink tint on a white screen (use Paint to make full colours, or service menu test patterns)