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Re: panasonic tx-51gf85h contrast
The tubes are aging and the grey scale has to be reset, enter service mode and readjust all guns until you get a black and white image. ones done memorize settings and that should fix the problem
also it has come to attention that the seals are failing that hold the coolant. please also check that no coolant has dropped onto the signal board. it is highly conductive and corrosive, it can eat a track on the board and create the same issue as you are having.
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This is not a projection set; but a picture tube set or CRT (Cathode Ray Tube) technology. If the set is working correctly you should be able to go into the menu and set the color, brilliance and contrast to get the right color and picture intensity. If the controls don't give you what is correct viewing it may be over age and need an adjustment of the internal chroma circuits - which may cost more than the set is worth since it is quite old. Hope this helsp.
it goes into that when something on the board is loose like a diode or transister unscrew the bottom behind the tv then check the solders if thats not the case there are fuses that blow and that can happen as well dont mess around near the power supply or picture tubes cause that is were the most dangerous spot to touch is use a non conductive object to see anything.
yes! those are the screen and focus adjustments. 3 for screen, 3 for focus. try this. go in menu....turn down color, brightness, contrast all they way down. you should then have no picture, but in your case a little red. then go to back of tv and turn those 3 screen adjustments all the way down. slowly turn the screens back up until you get barely a picture. because remember, your brightness and contrast is all the way down. the picture should be dim but seeable and with red, green, blue adjustments, make it a black and white picture. when balanced..... turn up color , brightness, contrast in menu. enjoy!
Yes there is a Service Code you have to have to get into Alinement menu and its a Dog following step by step to get in! (1) Turn set on cable (2) Turn sleep timer on 30 min (3) Press Action Twice exit menu 4) now tune to ch 124 (5) adjust vol half way down (6) Now Press vol- on front of TV ,now you should see a RED chk appear in upper corner (7) Now Power on remote hand unit and you shiuld be in menu Press cursor to move Mute locks where you want to aline ADJUST with vol-,Vol+ ch- ch+ for up&down back and forth.If you need anymore help let me know .
Replace the convergence amps. That unit takes two Sanyo STK392-110 and you could use 150's for greater reliability. Also replace one or more of the 1.2 ohm resistors in the yoke return circuit out front of the amps.