Panasonic Oled 55EZ950E, no picture, red led blinking every 4 sec

[Diah]

Hi, Diah sorry, could you explain better? Or if you know a procedure that allows us to carry out the test, it would be appreciated.

there are nothings could help your set-- the list of wrong test and guide so long starting from set pins to GND to use external V supply. yours set now scrap.

[Davi.p]

2 minutes test: put tcon card in freezer inside bag for at least an hour, pull it outside and mount rapidly averything as normal, test tv, if it runs ok then replace tcon , i will say you further details..

[Davi.p]

WARNING: never give listening to what that man, xxx, says, the auto elicted OLED man.. he is better Confusion man..

Warning from Admin - accounts making personal attacks will be banned

[riparo]

Ok

[Davi.p]

Pretty high possibility the software on TCON EMMC is damaged and difficult to restore, not a job for you nor common repair centers.. tcon autotest software cannot start.. a replacement tcon will be useful i guess but first perform all tests..

[riparo]

okay, so they could be the T-con the problem, as soon as I can tell you the values of points marked on t-con

[riparo]

Test these testpoints in Volt when TCON is powered (only 12V input not 24v): VGH, VGL, cathode of D6003, VCC1.8, VCC3.3, 2.5V, 1.1V, DDR1.5V

that is, here are the measurements in volts on the t-con as you reported on the test points

[Davi.p]

Check these 3 points:

[lotas]

This is Gnd.

[Davi.p]

It is almost surely GND, but not clear why is connected to a source of an input PWR mosfet, nor the fact it's isolated by chassis GND..

[riparo]

Here are the measured tensions

[Davi.p]

test in diode mode these two mosfets..

so something is more clear, the brown cable group from PB carries 12+24v, maybe a little step ahead..

VCC3.3V appears to be bad, are you able and friendly with advanced tech methods? Could you.locate eventual bad condenser on that line? both top and back side, with heat search? Or low ohm comparison..
that line probably feeds the pmic for the vcore V1.1 and VDDR1.5, and CPU won't start.and produce the test.... VCC3.3 is lower..

[riparo]

okay, I can try it in ohm

[riparo]

test in diode mode these two mosfets..

so something is more clear, the brown cable group from PB carries 12+24v, maybe a little step ahead..

VCC3.3V appears to be bad, are you able and friendly with advanced tech methods? Could you.locate eventual bad condenser on that line? both top and back side, with heat search? Or low ohm comparison..
that line probably feeds the pmic for the vcore V1.1 and VDDR1.5, and CPU won't start.and produce the test.... VCC3.3 is lower..

Hi Davi.p I checked the capacitors you suggested, they all seem ok, however I noticed that measuring one of the 2 diodes in the diode test gives me a different reading from the first and also by measuring it in volts I get 0v

[Davi.p]

I think ypu are not skilled to do advanced research on these boards.. so i suggest you to get a replacement tcon, the requisite :
1) must come from a cracked panel, guaranted..
2) must be returnable..

anyway if you want to insist troubleshooting a bit more tcon, test it at bench, put one only supply of 3,3v on the VCC3.3 point with a protected PSU, if it goes into protection then there is probably a bad condenser on that 3.3v line...

[riparo]

I think ypu are not skilled to do advanced research on these boards.. so i suggest you to get a replacement tcon, the requisite :
1) must come from a cracked panel, guaranted..
2) must be returnable..

anyway if you want to insist troubleshooting a bit more tcon, test it at bench, put one only supply of 3,3v on the VCC3.3 point with a protected PSU, if it goes into protection then there is probably a bad condenser on that 3.3v line...

I want to try to solve the problem on the t-con, I tested the capacitors under and above the board corresponding to the VCC 3.3 line in ohms, is it normal for the diodes marked by you to be a diode at or volts? Furthermore, can you tell me the precise area to check again what about capacitors?thanks

[Davi.p]

The capacitors are not to be checked only in ohms, them could fail under tension, so read my last post. For the diodes, who call them diodes? Are mossfets and must be checked in diode mode as alreeady said..

[riparo]

forgive me, I wrote it wrong, as I was telling you, I tested both mosfets in diode mode, the second one has some anomalous values, furthermore under voltage I have 0 volts, while on the first I have 12 volts as shown in the photo in the previous post, I wanted to ask you if It is always linked to the vcc3.3 anomaly

[Davi.p]

forget the two mosfets! Do the other test..

[riparo]

Hi Davi.p I tried to carry out the test but I didn't get any feedback, I also tried with the refrigerant spray to check if the condenser was heating but nothing, I noticed that at the output of the reported diode I have 1.60v which is the line that goes at the vcc 3.3 test point the smd capacitors reported above and below the board all have that value, I wouldn't want the problem to be the diode in question which doesn't work well, what do you think?