BUSH Bpdp42hd colour issue

[sordids999]

hello guys

got this issue at the moment where the right hand side of the screen is showing distorted colours i have uploaded picture of the fault as well

VScan 196 Volts
VS 204 Volts
VE 100 Volts
VA 54 Volts

if anyone can help

thankyou

[Andrew F. Ali]

Re: BUSH Bpdp42hd colour issue

It may be that little Timing Bd in the middle or the board at the bottom corresponding to the distorted picture.

[sordids999]

Re: BUSH Bpdp42hd colour issue

Do you mean the control board ?

[Andrew F. Ali]

Re: BUSH Bpdp42hd colour issue

Yes

[sordids999]

Re: BUSH Bpdp42hd colour issue

I will try a replacement control board i have tested voltages all seem ok and i cant find no shorts etc on the Ysus/Zsus
so ill update this thread soon

[sordids999]

Re: BUSH Bpdp42hd colour issue

Well tried a replacement control board still the same any ideas ??

[mmartell]

Re: BUSH Bpdp42hd colour issue

Do your voltave readings match the sticker on the panel ? Looks to me like you have a problem on your z sustain board - I would start checking it for blown fets or burnt resistors.

[sordids999]

Re: BUSH Bpdp42hd colour issue

Thats the thing ive checked fets for shorts nothing and all voltages match up with the panel sticker

[sordids999]

Re: BUSH Bpdp42hd colour issue

more pictures to the right of the screen i have a blotches of colour

[sordids999]

Re: BUSH Bpdp42hd colour issue

im also noticing there is a slight text which i cant read or show via picture which is showing on the screen that never goes away as if its image burn ?

[mmartell]

Re: BUSH Bpdp42hd colour issue

That as well is indicative of a bad zsus or at least improper bias setting. If you adjust the bias pot does the voltage and or picture change too ?

[Alastair E]

Re: BUSH Bpdp42hd colour issue

Bad locallised Mal-Discharge, Its a pretty old/worn out (Samsung) panel I guess, seen a few exactly like it, in the 42C450, with 15+ K hours on 'em.
(For some odd reason--Its always the Right hand side of screen--Production error/tolerance I expect)

Sometimes careful potching with SET-Up and SET_Dn as well as upping the Vs by around 10V can help....
Only permanent cure is panel replacement--Which aint viable....