SONY KE-42TS2E-turn ON, then OFF immediately

[catalin004]

Hello everybody and Merry Christmas!!! I have an problem with SONY- plasma tv, when I plugged in tv start an stop after 2 seconds, and red led flash for 2 times...if I repet the procedure make same thing...I have schematic, I check the smps and the voltage are ok.
I'm soory for my bad English and I need some ideeas...thank's

[dskall]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Can you upload schematic? Maybe some pictures

[catalin004]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Schematic it's here



Pictures I can't make, because it's stop very fastly, after 1-2 secconds

[catalin004]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Pls a schematic for PS?code

1-468-720-12

APS-192

Thank you

[freakaftr8]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

I remember this fault a long time ago on a Sony plasma 42 inch. If I'm not mistaken I believe all circuit boards and panel are produced by fujitsu or Something to that nature however the problem was a feedback circuit on the Y sustain board that was causing the problem. Never did get to finding out what the problem was but I replaced the Y board. Problem solved.

[catalin004]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Today I check Va and Vs voltages, and I found them with 2 Volts more then usually.
Va = 63,3 (noted on label panel) I found it 65,1V
Vs = 80.2 (on the label), I found it 82,5 V, measured with oscilloscope.
I putted them at correct voltage, from the label panel note and TV seems to run ok....
I don't know why, but I think that the problem may be some bad resistors .
When the TV was in run mode, I grow up Vs, at 82 V and TV stop immediately...that says that the protection are working at upervoltages ...And I think that is no problem on Ysus or Xsus modules.

[freakaftr8]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

What's voltage at primary capacitors in power supply when runnung,

[catalin004]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

372V , at black screen appear on display some little stars red and green....on all display.repeat just were is black screen, or something black on image...the tv work with RF antenna

[freakaftr8]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Could be aging panel. 372v sounds too low. Power supply overworking possibly. Check feedback resistors on power supply or possibly aging capacitor on primary.

[catalin004]

Re: SONY KE-42TS2E-turn ON, then OFF immediately

Do you have a schematic diagram for this SMPS?