Polaroid 3211-TLXB Cap Issue

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

I assume AS15 is the main chip on the TCon?

gamma issue? .....I have all my voltages on my power supply...should I recap the power supply?

Is there anything else I can do to troubleshoot? I read some TVs have a blinking power light for error codes when a TCon or mainboard breaks but only problem is my TV doesn't. The picture is either like the pic or completely white with sound. So does that mean it's most likely a power supply problem?

[budm]

Re: Polaroid 3211-TLXB Cap Issue

The AS15 IC is the small IC, it does looks like GAMMA voltages issue. Post good clear pictures of the T-CON board so we can give you the voltage test points to test.

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

thanks for the response here is the TCon with the main board unhooked

[budm]

Re: Polaroid 3211-TLXB Cap Issue

Yep, it does use AS15 Gamma IC U6.
See those test points (by CN2 connector) which are labeled as GMx. Report the dc Voltage readings in sequence
I.E.
GM1:
GM2:
ans so on.

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

Gm1 13.6
Gm2 13.6
Gm3 13.6
Gm4 13.6
Gm5 13.6
Gm6 13.6
Gm7 13.6
Gm8 2.4
Gm9 7.2
Gm10 11.1
Gm11 9.8
Gm12 8.5
Gm13 6.6
Gm14 0 VDC

I also noticed the power supply is making some noise...not too loud but audible when I was taking the readings. Not sure if this is an issue because I know power supplies sometimes make noise. I'm all ears for the next step!
EDIT: I used the ground point on the TCon for readings and grounded the chassis that holds powersupply and mainboard to where it's supposed to be screwed down

[budm]

Re: Polaroid 3211-TLXB Cap Issue

That is bad, need new T-CON board or replace the IC.

[mmartell]

Re: Polaroid 3211-TLXB Cap Issue

FYI if plotted on a graph a functioning ic will produce a curve headed in one direction. Yours has three glaring faults: same reported voltage GM1->GM7, rising voltage GM8->GM9 and precipitous drop from GM13->GM14 (as well as GM7->GM8).

*disclaimer-all information was discovered by others and may contain errors as reported by me, but you get the idea...

[budm]

Re: Polaroid 3211-TLXB Cap Issue

Not cheap board:'
http://www.shopjimmy.com/philips-996...rd-rebuild.htm

Be careful on the one from E-BAY, make sure it can be returned.

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

thanks for the info! could I possibly have wrong/missing voltages going into the TCon?

[budm]

Re: Polaroid 3211-TLXB Cap Issue

No, otherwise you will not have 13VDC which is generated by the boost converter circuits. The DC voltage on the SMD Fuse of the T-CON board should be about 12VDC.

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

boost converter circuit?...I will take your word for it!lol I will probably get one off ebay. I see they use this card in multiple brands of TV...is there a firmware issue I would have to worry about in obtaining a new one from a TV other than a polaroid?

Is it possible to replace the AS15 with just a heat gun? I reflowed an Xbox once but never worked with surface mount chips and would like to learn.

Once again thanks for all the help!

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

replaced the tcon with a supposedly known good one. the polaroid screen comes up properly with black imaged with white letters. The blue no signal screen is there but the letters are faded and the menu box changes colors as it sits there. Video now has NO sound and is super messed up.

https://www.youtube.com/watch?v=-gQ3...e_gdata_player

My guess is the TCon is bad....but why did I now lose sound is my question?

[Shinju]

Re: Polaroid 3211-TLXB Cap Issue

Sure you got everything hooked up right? That looks like what my Toshiba did when I forgot to plug in a ribbon cable to the crossover board.

T-con possible but that doesn't affect audio you might have something else going on too.

[Ifixthings]

Re: Polaroid 3211-TLXB Cap Issue

double checked all conections, unhooked them and reconnected them. I Cleaned up the pads where card is mounted as they were a little corroded. The tv now has sound but the picture is really messed up like the video. When the tv was first turned on it had a vertical bar through the display. The Gamma voltages decrease for the first 7 or so test points then go back up. Test point 14 is still 0VDC with this "good" TCon.

Is this TCon really bad ? or do I have some other issue?....because this TCon the picture is way worse than the original TCon.

[audiofreak19]

Re: Polaroid 3211-TLXB Cap Issue

Question related to the as15 chip. Does it matter if you get the same letter one. Like I have a F that is bad. Can I use a G instead or does it have to be a F