hello
I have a ctx pr960f that needs internal adjustment. i checked if screen was cranked up accidentally, but its still fixed with paint.
there are a couple of other pots for adjustments labled : TLV, YCH, YBH, H.TRP (horizontal trap?) and further CBH and APH.
can anyone tell me what these pots are for and if turning down sreen (left or right turn?) will solve my problem?
many thanks
kai

The controls TLV etc are on the scan coil mounted to the CRT, these controls will not affect brightness only convergence so you will hava a bright out of convergence picture.

The G2 or Screen control on CTX is electronic and only available via a service menu or software setup.

The fact that it is bright suggests that the feedback resistor has increased in value.

The G2 circuit will be on the main brd follow wire from CRT base brd connected to G2 pin.

Rich

Dear Rich,
many thanks for your reply. Could you tell me the resistor numbers (eg. R414) of the feedback resistors in question and mail me schematics/service manual if you have one?
greetings from berlin
kai

Hi guys,
Thanks for the tip with "+"&"-" at power on.
It gave a sort of extension of the settings menu which allowed me to set up colors and brightness at "Color>User" menu, experimenting with RGB and BIAS values provided there. It also provides some more geometry (I presume) parameters but I haven't any reasons to play with them.
Also, it seems that if you take out the power cord and reconnect it keeping +&- depressed while switching power on the position and geometry settings are reset to a sort of default. I havent experiment more with it because it's set OK now and I don't wanna disturb it

Ion

hello rich,
can you please explain how exactly this software setup or service mode on ctx monitors work?
many thanks
kai

Hi I am sorry I do not have the schematics for this one or how to get into service modes or software for any CTX units.

Rich

well then, but thanks anyway, its great to know you are out there, you are doing a great job here on this site, respect.
greetings
kai

Hi what is the FCC number on this unit.

Rich

I don't know if we have FCC numbers in europe. The no. on the back of the cover says:
1VO-01305287 WITH SOME BARCODE LABLED 1910-F10

Hi I am trying to find which chassis is fitted.

I have schematics for 3 19" CTX units which maybe similar.

Rich

that would be excellent if you coud mail them, thank you very much.
PR960F is a 19" monitor.
Where would I find the chassis no?
The mainboard was manufactured 10/11//99 and assembled 15 th march 2000.

On the main circuit board:

1905PF1 M/BD
11S31-107A REF:A01

2 stickers on the metalshild on the back where the commectors are:

1)
RMT 302038
SA1910-F01
KOO C6

2)
00265292

an engraving on the metalshield itself:
7510057202E

many thanks
kai

The one that is nearest is the 1995UED with the pcb having 11S31-072A.

The problem is that this is not complete missing the circuits.

But I read the manual and to get into the service mode on this you press "+" & "-" at the same time then power up.

Rich

I tried - and + at power up, no success., the only function I could find was < and> at power up to get to something called LOCK KEYPANEL.

after some trying i managed to activate somehow something called SPECIAL in osd which gives access to the colorbias of the coclor presets. when i turn down all the bias, R+G+B to zero its somehow aceptable, but i would call it a dirty method, can according to the service manual, the screen control at the FBT be used? cause it was not included in the special menue, neither the overall brightness.

Hi adjust the control on the fbt marked screen. Mark it first so you can return it to its origional setting.

Rich

Have you guys had any luck solving this problem? I have 2 of these, both too bright. A friend says fly-back transformer may be bad, but i'm no expert (or even a novice). Any suggestions? I have no problems dismantling these babies and adjusting some pots.

Thanks!

jason