model# pr2052 p101
chasis# ptv510-ah01
when i powered it on all worked well but got blank screen,so looked at the main board and found that the tunner was barely hanging on so i resoldered it{looked like cold solder break}as well as adjusted the screen and focus block,it wouldnt find the channel for the coresponding plug that i had the cable attached to,now it recognises the channel that its supposed to when the cable is plugged into it{channel 3}but still no picture or sound.it has AV hookups but they look the same as the 75Ω on the screen,which is nothing.but after adjusting the focus/screen block i can partly see the channel and time on the screen but they look chopy and blocky?also i cant find a service manual for it anywhere ive checked the technicians corner and the net.
UPDATE:i think i know why the time and channel are chopy and blocky,i removed the front screen to look into the crt's to make shure they were all working right and noticed that you cant even see through the green lens and can barely see through the blue as the coolant liquid looks like it has mold/dust/something in it?
im affraid even after i change the fluid its not going to affect the working condition of the tv as i still dont get snow when there is no cable plugged into the back(it may be a blue screen instead but)i should still be able to see some blue on the screen as its not as cloudy as the green,also i dont get any sound from it when i do plug the cable in?i dont want to spend good money on the fluid change when theres a deeper underlying problem with the tv that i may not be able to repair.
Tough call on an older set, the manual may never have been released on cd.
Until you can see the menu it's going to be hard to tell if the internal speakers are turned off, what source input is selected, mute, etc..
Coolant is about 6 bucks a bottle, shipping will probably be more unless you have a supply house locally, plus a small $2 tube of rtv sealant for the gaskets from auto supply, and a bottle of rubbing alcohol and a couple microfiber cloths for cleaning from the dollar store.
There used to be a brand of automotive antifreeze that was clear, not green or orange, that might make a good substitute for tv coolant.
i finally got snow but its all red right now i just got done cleaning the blue crt{what a pain}my coolant is still in the mail maybe ill have the green cleaned by then.i was tracing wires back from the tuner and ran across a trimmer capacitor that said DBX FILTER and one next to it that said STEREO DECODER,so i thought if i turned them down i would allow more interferance in so i adjusted that and the stereo as well as sub bright and sub contrast,now i get snow but still no sound,and i can read for the most part the menu on it.maybe all will be alot better when i replace the coolant and i can worry about the sound/better picture then.i did check to see if the speakers were turned off in the menu and they werent even when i push the VOL button nothing comes up on the screen.thanks for the reply
If you can find which other models also used the PTV510 chassis, it should increase the number of repair case histories available. It looks like model pr2052 p101 uses manual # 7524.
PTV500 SERIES CHASSIS
7524
PR2041P101
PR2046A101/P101/P12
PR2046P101
PR2052A101/P101/P102
PR2052P101
PR3046A101
PR3046A101
PR3052A101
PR3061A101
PR3061A101
PR3446A101
PR3952B101
PR4052B101
Tips from highlandelectrix:
PR2041 PTV512 NO SND BUT PIC OK IC204(LA4270) AND L412
PR2041 PTV512 POOR CONVERGENCE FUSES ON CONVERGENCE BOARD
PR2041 PTV512 POOR CONVERGENCE R2802 AND R2803(0R12) ON DEFLECTION BOARD
PR2046 PTV510 NO SND BUT PIC IS NORMAL IC204(LA4270) AND L412
PR2046 PTV510 POOR CONVERGENCE - WILL NOT ADJUST ALL FUSES ON CONVERGENCE BOARD
PR2046 PTV510 POOR CONVERGENCE R2802 AND R2803
PR2052 PTV510 NO SND BUT PIC IS NORMAL IC204(P/N# LA4270) AND L412
PR2052 PTV510 POOR CONVERGENCE - WILL NOT ADJUST ALL FUSES ON CONVERGENCE BOARD
PR2052 PTV510 POOR CONVERGENCE R2802 AND R2803
PR3046 PTV520 NO SND BUT PIC IS NORMAL IC204(P/N# LA4270) AND L412
PR3052 PTV520 POOR CONVERGENCE - WILL NOT ADJUST ALL FUSES ON CONVERGENCE BOARD
PR3052 PTV520 POOR CONVERGENCE R2802 AND R2803(0R12) MAGNAVOX PR3052 PTV520 NO SND BUT PIC IS NORMAL IC204(P/N# LA4270) AND L412
PR3061 PTV525 NO SND BUT PIC IS NORMAL IC204(P/N# LA4270) AND L412
PR3061 PTV525 POOR CONVERGENCE - WILL NOT ADJUST ALL FUSES ON CONVERGENCE BOARD
ok i found crosshatches in the menu as well as convergence but on video if its converged right when i turn it to channel 3 the convergence is off a bit,and vice versa.also the color is dark and ive already adjusted the SCREEN via the focus block untill all retrace lines were gone.when i turn down the GAMMA the pic gets brighter and i have the SUB BRIGHT and SUB CONTRAST maxed out.any ideas?
model# pr2052 p101
chasis# ptv510-ah01
may be a Sears tv.
I would check all the rest of the chassis for broken solder. For sound, inspect the IC204(P/N# LA4270) AND L412 mentioned in the tech tips( resolder the suspect coil), check fuses, resistors, diodes between the convergence and crt's.