Samsung UN60EH6000 wont come on after lightning strike.

[karthur]

We had a lightning strike a few days ago really close to my house. My Samsung UN60EH6000 was on when it hit. Afterwards, the TV would not come back on.

I had repaired this TV a few years back by replacing the T-Con board. (The post I had on this is repair is here.)

When I turn on the TV, I don't get any start-up melody. The screen just dimly flickers around the edges.

Here is what I have checked.
On the power supply board, 14pin connector:
1 :12.7 Vdc
3 :12.7
5 :12.7
7 :12.7
9 :0
11 :5.
13 :5.

Also On P/S board I checked the voltage going out of it. There are pins 1-9 (See attached image of connector).
Pin 1 to 4 (D1+ to D1-) =170Vdc
Pin 2 to 4 (D1+ to D1-) =170Vdc
Pin 6 to 9 (D2+ to D2-) =170Vdc
Pin 6 to 9 (D2+ to D2-) =170Vdc

I also unplugged the ribbon cables between the T-CON and the front panel. With both of them unplugged, the screen is black. With only one of them plugged in, the opposite side of the screen is totally backlit. (see image below).

On T-Con board, I checked the F301 fuse and there is 12.7 volts on both sides of the fuse.

I am thinking/hoping the T-Con board is dead again. Before I order a replacement, is there something else I can check to verify this is the issue?

Thanks for all the help.

[nomoresonys]

If it was me, I would try another mainboard, sometimes you get a bad one, you should be able to get a refund.

[karthur]

Re: Samsung UN60EH6000 wont come on after lightning strike.

I replaced the T-Con board and still have the same issue.

[karthur]

Any help would be greatly appreciated.

Thanks

[Davi.p]

Probably a faulty eprom or dc dc converter on main board

[karthur]

Would it be worthwhile to try to troubleshoot and find the bad part (s) or just order a replacement board?

I have already replaced the T-Con board.

[Davi.p]

i always try to repair to component level, my ego collapses otherwise, depends on your repair background..

[karthur]

I've done some repairing. If I knew what to check and what the readings should be I might could trace down the issue. Is there a diagram or manual to show the readings?

Thanks

[EazyBone]

Well if we don't have pictures of PSU main etc and then the pin connectors from board to board with the legend, that would help. Also lightning (if it was) will destroy PSU or main generally I would think. How do you know it's lightning strike? Did other things in your house fry or just the tv?

[karthur]

Well if we don't have pictures of PSU main etc and then the pin connectors from board to board with the legend, that would help. Also lightning (if it was) will destroy PSU or main generally I would think. How do you know it's lightning strike? Did other things in your house fry or just the tv?

Yea. There was some other things in the house that would not work after the lightning strike (Alarm system, HVAC unit, Garage door opener and one refrigerator). I did check the connecters on the PS board in my original post, but I guess they dont mean much unless you know what they should be. My bad.

I DO NOT have a red standby light and I initially suspected the PS board, but after checking the pins, I thought the PS was good.... maybe not.

Below are the values I got along with the values printed on the board.

On the power supply board, 14pin connector:
1 :12.7 Vdc (PWM_D1M 13v)
3 :12.7 (B13V 13v)
5 :12.7 (BLU_on/off Vamp)
7 :12.7 (GND Vamp)
9 :0 (GND)
11 :5. (A5v)
13 :5. (Power_on/off 5v)

Here is a full image of the PS board

[karthur]

Picture of the main board.

[karthur]

Picture of the T-Con Board

[Davi.p]

i think you must reprogram IC901, first however you must check some tensions, can you photograph the back of main board? Check voltage on ic905 pins, and on every mb coil except those 4 grouped..

[karthur]

Here is a picture of the back of the main board. Also the measurements you asked for.

[Davi.p]

Check the regulators IC204 (1,5v on the tab), IC202 (??V), IC206 (3,3v on the tab). This chassis really sucks, the main flash ic is integrated to the SOC!!
if regulators appears ok it must be reprogrammed the SPI flash IC..

[karthur]

Here is what I got when I checked IC202 and IC204. IC 202 was 3.3V on the pin 1. IC204 was 1.5v on the tab. I could not find IC206. If you found IC206, can you point to it on the board?

When looking for the IC206, I noticed a couple "Burned" components. These are D407 and D409. I take it these are voltage regulators. Here are the readings I get on them. Are these OK?

"IF" I do need a new flash for the IC901, where do I get the file to flash on it?

Thanks

[Davi.p]

Sorry not IC206 but IC601, to the right bottom, those two are double diodes, check them in diode mode, the ic901 must not be changed but only programmed, i don't have the dump..

[karthur]

Do I need to remove the IC601 from the board to test it? Do you think the D407 and D409 are good?

[Davi.p]

1) test as the other ones 2) test them..

[karthur]

I did check the D407 and D409, but not 100% sure what they should test. They were 0v on one leg and 3.5v on the other (See post #15). I tested IC601 on the board with power on it and without power diode mode. Attached are the results.



I also tested some of the other voltage regulators that looked similar in diode mode. The readings were .3 and .6 one one and .5 and .6 on another one. Not really sure if I am doing this right or not.

[Davi.p]

those two are double diodes, check them in diode mode,

no power on board..
test ic601 as the other ones, thus in volt on the tab, if it's 3,3v is ok, if no short (0v) on the diodes then ic901 reprogram..