hisense 55k610gwn no power no standby

[hmendez86]

I have this hisense 55k610gwn ....I don't have no voltage on pins for 5v or 12 and 24v for leds. It's death power....I did test for shorts and did not find anything...everything seems rigth, no burns at all....did some research and supposedly the issue is the diode VD806 but no short found even if I took out of board...on test mode reads .388 around there and the VD807 is the same..

[hmendez86]

Re: hisense 55k610gwn no power no standby

[budm]

Re: hisense 55k610gwn no power no standby

So no DCV at all on any one of the pin of the small white connector?
If that is the case then you need to find out first if you even have 160VDC between the two legs of the main filter cap or not, you need to have that first before going further.

[hmendez86]

Re: hisense 55k610gwn no power no standby

I have 165 VDC on large filter cap....

[hmendez86]

Re: hisense 55k610gwn no power no standby

No voltage on any of the white socket pins .000v...

[budm]

Re: hisense 55k610gwn no power no standby

OK, so you do have main B+ for running the STBY Power supply (SMPS IC N802, Power MOSFET V803, Power transformer T801).

You need to check the solder joint of the transformer T801 and MOSFET V803.
Check the STBY Rectifier VD819 (for 12V STBY PS), VD820 (for 16V STBY PS) to make sure they are OK.
Check running rectifier VD812.
Check running caps C822, C829.

Need to get the P/N OF SMPS IC N802.

Notes: N801 is the PFC IC.
N901 is switched SMPS power supply using Transformer T902.

We need to the pictures of the whole backside of the TV to see how all the boards are connected, need to find what the connector XP901 goes to.

Shopjimmy sells power supply repair kit for your power supply board.
http://www.shopjimmy.com/catalogsear...hisense+55k610

http://www.shopjimmy.com/hisense-163...repair-kit.htm

Hisense 163714 (163716, RSAG7.820.5186/ROH) Power Supply
http://www.shopjimmy.com/hisense-163...upply-unit.htm

Pictures provided by shopjimmy.

[hmendez86]

Re: hisense 55k610gwn no power no standby

On the caps I have .00v
Vd820 no signs of 16v
Vd819 no 12v this two transistor are .00v
.
Diodes Vd810 . Vd812
On the cathode side measure 22.23v goes up 23.24v and down on vd810...on vd810... -7.88v as no power I think..

[budm]

Re: hisense 55k610gwn no power no standby

On the caps I have .00v
Vd820 no signs of 16v
Vd819 no 12v this two transistor are .00v
.
Diodes Vd810 . Vd812
On the cathode side measure 22.23v goes up 23.24v and down on vd810...on vd810... -7.88v as no power I think..

What GND ref point did you use when checking the DCV on the Cathode of VD812? Chassis GND? VD812 is in the primary side so you have to use the negative leg of the main filter cap as the GND ref. for your meter.
Did you also check the Diodes using meter in Diode mode to check them? And of course, no power to the unit when doing Diode mode test.

[hmendez86]

Re: hisense 55k610gwn no power no standby

[hmendez86]

Re: hisense 55k610gwn no power no standby

[budm]

Re: hisense 55k610gwn no power no standby

How about VD819, VD820 Diode test?

[hmendez86]

Re: hisense 55k610gwn no power no standby

On diode mode Vd820 is .147 on right and left leg....black probe In middle pin....and Vd819 black prove middle leg .158 both rigth and left legs.........

[budm]

Re: hisense 55k610gwn no power no standby

How about when Red probe is in the middle instead? What do you get?

[hmendez86]

Re: hisense 55k610gwn no power no standby

Red probe I get .0L on both transistors.

[hmendez86]

Re: hisense 55k610gwn no power no standby

Man I got it to work it was an ic chip 1271A I add a 1207A and seems to work.... but I have no stby 5v ?? I have 15.6v 15.6v and 12.v 12.v Gnd Gnd.....pWm 70.8v ??????........standby 0.00v ???? This reading Is with out main board.....when I add main board I get 24.5v on standby that's alot when this happends I get a buzz winding noise....

[dick_barton]

Re: hisense 55k610gwn no power no standby

Man I got it to work it was an ic chip 1271A I add a 1207A and seems to work.... but I have no stby 5v ?? I have 15.6v 15.6v and 12.v 12.v Gnd Gnd.....pWm 70.8v ??????........standby 0.00v ???? This reading Is with out main board.....when I add main board I get 24.5v on standby that's alot when this happends I get a buzz winding noise....

Those two IC's appear to be almost identical but they are different and I don't think they are interchangable. Pin 1 has a different function on each.

[hmendez86]

Re: hisense 55k610gwn no power no standby

So thats why I won't have 5v...... I'll replace with the original then....

[budm]

Re: hisense 55k610gwn no power no standby

They are not interchangeable (NCP1271, NCP1207), look at the spec sheet and description and the App note diagrams. I hope nothing got damaged.

[vinceroger69]

Re: hisense 55k610gwn no power no standby

Man I got it to work it was an ic chip 1271A I add a 1207A and seems to work.... but I have no stby 5v ?? I have 15.6v 15.6v and 12.v 12.v Gnd Gnd.....pWm 70.8v ??????........standby 0.00v ???? This reading Is with out main board.....when I add main board I get 24.5v on standby that's alot when this happends I get a buzz winding noise....

Whats the ic board number location?

[budm]

Re: hisense 55k610gwn no power no standby

That IC N802 is for the Standby power supply, so right now you are not going to get the standby Voltage, so I do not understand when you said you got it to work, no standby Voltage then nothing else will work.