Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

[soybon]

Hi all, I ordered the BN44-00514A repair kit from shopjimmy.

Order came in and I began replacing the most commonly indicated bad components on this board (including those mentioned in the other 8 threads on this forum and elsewhere).

I got to CS825 and I was sent a wrong capacitor, that I also think is incompatible, but wanted to ask if anyone can advise. CS825 OEM is a Pilkor MMKP 384 PCMP 1250V, 68nF box-type (22.5mm). They me some random plastic dipped 1250 V cap that is only measuring 7nF...

I've reached out to shopjimmy about this, but haven't heard back yet.

Any thoughts?

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

So, it's been about a week since I sent shopjimmy a message to clear this up. I had to send a second message just to get a response, albeit a rather generic one, so still no clarity on this matter.

The Pilkor is a component that has been reported bad in these boards before.

I was really hoping I could get some feedback from y'all.

Thanks in advance.

[tw2005]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

If the other was the same value it probably would have been ok. They've stuffed up for sure . See if you can find a local supplier for a 68nf metallised polyester . 683 is what that should be marked , 682 is out by a factor of 10 and why you get a reading of 7nf.

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

OK, thanks. I was able to solder the Pilkor back in. As well as all of the remaining components from the shopjimmy set. Here's where I'm at now:

All power is being supplied to board via a 1:1 isolation transformer, all checks done with Fluke 179. All of my test and rework equipment is at work and the tv is at home (except for the BN44-00514A SMPS). I do all the work on a well grounded esd protection mat and have myself a esd wrist strap (each with 1MOhm resistor to gnd). I'm pretty much a noob at this, but have learned this much from other (very basic) electronic troubleshooting I've done in the past.

Before swapping in new components, plugging in the board would burn the fuse next to the AC-in every time (went through a few slo-blows) [Fig 1].

I soldered in all the components except for the wrong cap they sent (see previous post) and except for the ICs on the backside of the board. Now when plugging it in, the fuse remains intact. Line voltage is measuring at 120V AC, but I don't know where to probe to make sure that the correct voltage is being supplied to the board, e.g. either end of the fuse comes in at 60V AC.

I took the board home and installed it back into the TV and still no stby.

Brought it back to work (all transportation done in a large esd bag) and swapped the ics. All seemed to go well except for UQ802 [Fig 2]. It looks like I did some damage with the hot air gun... on board at the top pins of the chip, where the bubble is, the three traces that connect to the legs appear to still be intact after checking with ohmmeter.

After this, I plugged it in and so far as I can tell, still no standby voltage on the benchtop. To check this, I probed voltage between pin 2 of the pictured connector [Fig 3] and various ground points and it comes up as zero.

Any ideas where to go from here?

[Moreno83]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Just looking at the picture with the ic it looks like a pad is missing or broken. Topside ic on the right hand side.

Is it possible to take a better picture and clean it with alcohol? It looks like the trace has to go to the tin point but is broken....

Hard to see on my phone haha.

[martino]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

I have had 2 repair kits for the 64" version of these and in both cases UQ802 in the kit was defective. I had to put the original IC's back in to recover standby voltage.

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Here are some more photos of the board. These include pics of my board as well as stock hi-res photos from shop jimmy.

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Just looking at the picture with the ic it looks like a pad is missing or broken. Topside ic on the right hand side.

Is it possible to take a better picture and clean it with alcohol? It looks like the trace has to go to the tin point but is broken....

Hard to see on my phone haha.

Thanks, Here is a close up of the much clearer shopjimmy photo. it only appears that pins 1, 3, and 4 (from left of top row) have traces and these 3 measure continuous. The resistors in that region check out for continuity, but I have not checked that the resistance values are in range.

Edit attached my UQ802 also.

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

I have had 2 repair kits for the 64" version of these and in both cases UQ802 in the kit was defective. I had to put the original IC's back in to recover standby voltage.

Thanks martino. I'll pull the replacement UQ802 off tonight and swap the original back in. While I have the chip off, I'd like to test the traces to see if my heat gun ruined them, but I can only identify where 5/7 lead to.

Would you happen to have a schematic so I can check them all?

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

I have had 2 repair kits for the 64" version of these and in both cases UQ802 in the kit was defective. I had to put the original IC's back in to recover standby voltage.

Great call martino! Thanks for the tip. I'm finally getting 5.3V on stby now (4.3V on PS_On). After jumpering PS_On to gnd, all 15V and 5.3V pins come up.

I'll let y'all know how it goes from here.

[martino]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

awesome! I know it threw me for a loop when my standby was gone,kept coming back to the IC and finally swapped the old one in and bingo Gotta love defective new parts.

[soybon]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Reinstalled the board and everything works now. Thanks badcaps.

[ReeceyBurger123]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Awesome work cheers Marty

[martino]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

I love a happy ending

[Andyy]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

I have had 2 repair kits for the 64" version of these and in both cases UQ802 in the kit was defective. I had to put the original IC's back in to recover standby voltage.

Out of curiosity, does anyone know whether the UQ802 supplied in shopjimmy's kits are pre-programmed? Or are the replacements just the blank microcontroller?(MCV14 is a microcontroller made by Microchip).

I noticed that there was a silk-screen printed location for a programming header on the component side of the board.

[martino]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

As in we need to program them first? I thought they where jst a voltage regulator type,maybe that's why the little bastards don't work.

[king123]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Hello I have same Samsung TV model pn60e7000ff. With same problem but i see there is also 2 diodes that a blown up DS808, and DS810. Do you guys know were can i find them or what kind of diodes are they so i can order them.

[king123]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

Diodes are next to QS802 and QS804.

[Andyy]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

As in we need to program them first? I thought they where jst a voltage regulator type,maybe that's why the little bastards don't work.

I've just confirmed that UQ802 (Part No. MCV14A) supplied in shopjimmy's kits are indeed blank and have not been programmed. I put the MCV14A in my programmer and all memory locations read back FF.

So some advice to anyone repairing these supply boards....DO NOT REPLACE UQ802

I don't know if the firmware can be downloaded from a working MCV14A because it's likely to be code protected (memory locations will read back 00). I haven't tried this though.

[dick_barton]

Re: Samsung PN60E7000FF No Power, No Standby- SMPS Component Question

You may be able to read it in your programmer set to one of these options:-

PIC16C505 PIC16F526 PIC16F630

"This device has been out in China for a while. So called MCVxx is only
provided to big customers. They are the low cost version. And it seems
to be similar to the old CF745/765 which means that they may not
be tested thoroughly in Microchip facility but will be tested
in the large customer site. They are not supposed to be in the mass market.

From:
http://forum.esm-cn.com/FORUM_POST_1...00339532_0.HTM

MCV18A can replace PIC16F54 CF745
MCV28A can replace PIC16F57 CF775
MCV08A can replace PIC12F508 PIC12F510 PIC12F629
MCV14A can replace PIC16C505 PIC16F526 PIC16F630 "