Dead Sanyo DP26648 logic board, need service manual.

[Spork Schivago]

I need a service manual for a Sanyo DP26648 LCD television. If finding one for a DP26648 LCD television is difficult, a DP32648 LCD television service manual might work. If anyone can help me, I appreciate it.

The logic board has power going to it but the t-con board is getting nothing. It's very hard for me to test this without knowing where the electricity should be going. If anyone has any suggestions, please let me know. I will send pictures if requested. I think for the most part, if I can get my hands on a copy of the service manual, I should be able to figure it out myself. Thanks.

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

http://elektrotanya.com/?q=showresul...oria=&kat2=all

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

http://elektrotanya.com/?q=showresul...oria=&kat2=all

Thank you! I have been scouring the internet for the past few days looking for this. Hopefully this one I get working. {: -)

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

Okay, so I got the service manual but I'm having some problems. I attached a file called T-CON BD and above the fuse, there's a test point showing VIN_12. That test point reads 1.8vdc. Does VIN_12 mean 1.2vdc or does it mean 12vdc?

There's a power failure circuit that can get tripped but I don't think that's the problem. Pins 32 and 22 on the IC800 chip go low when something's wrong, they're both high. The fuse on the T-CON board checks out okay. I'm getting the back lights lighting up but nothing on the screen.

I ordered an Atlas ESR meter but it won't be here for a couple more weeks so testing caps isn't too much of an option yet. I thought maybe one of them was bad but since I have no way to test it, I'd like to maybe test some other stuff. Anyone got any suggestions?

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

Yes, that 12vdc is from the switched transistor on the main board. There should a transistor close to the connector that goes to the T-CON board.
Are you getting just the white glowing screen (backlights are on?)? Sound?

[tibimakai]

Re: Dead Sanyo DP26648 logic board, need service manual.

that's what I have on a Vizio after playing with the panel flex cables while the TV was on. Most likely I have shorted something(did not place correctly the flex cable into the t-con board connector) and I blew that transistor.
budm, what do you think that transistor should read when it is working correctly?

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

I'm getting just the white glowing screen. As far as I can tell, no sound. The friend that wants it fixed had no remote. There's no sound when I have a source hooked up to either HDMI port or coax. The laptop I use can provide sound over HDMI. I'm not certain about the TV though. Coax should of brought something up though.

I tested what I believe was the transistors. They're a bit weird though. I've attached some files with their values. If a prong doesn't have a value next to it, it was either 0vdc or close to it like 1.5mv. I thought they'd at least have values on two of the prongs. Are these the parts I should be testing?

[cashkennedy]

Re: Dead Sanyo DP26648 logic board, need service manual.

I have an extra set of all the boards for a DP32648 except the psu. (i bought an auction with all the boards just to get the psu). My psu is 100% identical to yours, i had to replace it though cause lightning destroyed the transformer windings.

So if you find out you need 1 of the other boards, and can use one from a dp32648 tell me.

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

Okay, thank you Cashkennedy. I might take you up on that. I'd like to try and fix this one without replacing any boards. We are hurting for cash right now, hence the reason we're trying to fix it. Between the block and head on my Jeep, it's leaking and it's getting worse each day. The catalytic converter and muffler needs to be replaced as well. I'm probably going to replace the tail pipe while I'm at it. The exhaust is going to cost me around 225$. The gasket set for the head is going to run me around 100$. The intake manifold is also leaking but that gasket should be included with the head gasket set. I've never changed a head gasket before and I've heard that they can be a bit of a project. I'm not looking forward to it. The money we get from fixing this tv should give us enough to start purchasing stuff for the Jeep.

Just out of curiosity though, what would you want for the logic board (the one that goes between the PSU and the T-CON BD)?

[cashkennedy]

Re: Dead Sanyo DP26648 logic board, need service manual.

How am i supposed to ask for any money after hearing that!

I payed $40 (including shipping) for every board (and part, the guy even sent me the speakers and power cord...) from a parted out dp32648 (seller listed it as having been parted after screen damaged). So at most id only try to sell the logic board for $20 on ebay. And it fixed my tv already, so anything at this point is just icing on the cake.

But as long as you pay the shipping, Id be happy with that, but you could throw in 10-20 if you want to pay for it.

Just be sure it will have the part you need, before paying for the shipping and all.

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

OK, I look at the diagram, and here is what you need to do:
If you look at page 28 Block diagram, @ the bottom right you will see Q6360 (6-pin MOSFET) which is the transistor that is used for feeding the LCD panel T-CON board with 12Vdc.
Now look at page 57 grid A3, A4, you will see Q6360, pin 4 is the 12V input to the Source of the MOSFET, pin 1, 2, 5, and 5 are tied together, these are the Drain pins of the MOSFET, they are the 12Vdc output pin, when Gate pin 3 is HI, it goes HI because when Q6351 Base is fed with HI which will turn ON Q6351 which will cause Q6350 to turn OFF causing the Collector of Q6350 to go HI which turns on the MOSFET Q6360.

So you need to find out if you have 12vdc at pin 4 of Q6360, and about 8~12vdc at pin 3 of Q6360, and 12vdc at PIN 1/2/5/6 of Q6360.
Q6360 is real small and it is close to C6355, I had a hard time locating it.

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

@tibimakai, these may explain how to test the transistor:
http://www.kpsec.freeuk.com/components/tran.htm
http://www.learnabout-electronics.or..._faults_02.php
I hope this what you need.

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

So you need to find out if you have 12vdc at pin 4 of Q6360, and about 8~12vdc at pin 3 of Q6360, and 12vdc at PIN 1/2/5/6 of Q6360.
Q6360 is real small and it is close to C6355, I had a hard time locating it.

Well, I was actually looking for that dang Q6360 last night but ended up giving up and going to bed. It does appear to be bad. All 6 pins appear to be burned. Like someone forgot to clean the resin off after soldering. Should I still try to measure it or because of it's shape, should I try to replace it?

Also, any idea what might of made it die? Maybe it just might be cheaper to take Cashkennedy up on his offer. What do you think?

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

But as long as you pay the shipping, Id be happy with that, but you could throw in 10-20 if you want to pay for it.

Just be sure it will have the part you need, before paying for the shipping and all.

I'd definitely pay you for it. Is there a part number on it? This one has a part number of 1lg4b10y02200. The part number on this one is next to the big heat sink. Real close to the left corner when you have the plug in connectors facing to the left.

Anyway, I need to get some sleep so I'll talk to all of you guys later. Thanks for all the help and good night!

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

Well the size of it seems to be too small to supply enough current to the T-CON board, or there is shorts in the T-CON. But at least we found out why you do not have 12vdc for the T-CON. If you do have 12vdc at pin 4, then you can use 1 or 2 Ohms resistor and connect it between pin 4 and any one of the PIN 1, 2, 5, or 6. This way if you do get the picture OK then at least you know that the T-CON is good and not shorted out, otherwise when you put in new main board you will not burn up the transistor on the new board.

[cashkennedy]

Re: Dead Sanyo DP26648 logic board, need service manual.

Ill get you the part number from the main board tomorrow. But as budm sugested, you might want to try testing what you can first, to make sure nothing else is wrong.

[cashkennedy]

Re: Dead Sanyo DP26648 logic board, need service manual.

Part number on the main board is 1LG4B10Y02200. So looks like you might be in luck if you need any parts from it.

I attached pics to show what all i have, though theres speakers, and cables that arent shown.

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

If you do have 12vdc at pin 4, then you can use 1 or 2 Ohms resistor and connect it between pin 4 and any one of the PIN 1, 2, 5, or 6. This way if you do get the picture OK then at least you know that the T-CON is good and not shorted out, otherwise when you put in new main board you will not burn up the transistor on the new board.

Okay, so I measured the pins on Q6360. The values are as followed:
1 - 0vdc
2 - .37vdc
3 - 0vdc
4 - 12v
5 - .37v
6 - .37v

There was 8vdc on pin 3 but I accidently touched pin 4 and 5 at the same time with my probe and now there's nothing. I did measure all the other pins before measuring pin 5 so those values weren't affected by my mistake.

Just to make sure I got this all right, Q6360 is a MOSFET and not a transistor? And if I solder a 1ohm 1/4w resistor from pin 4 to lets say pin 6, if everything's okay, the VIN_12V will read 12vdc and there should be a picture on the television?

[Spork Schivago]

Re: Dead Sanyo DP26648 logic board, need service manual.

Part number on the main board is 1LG4B10Y02200. So looks like you might be in luck if you need any parts from it.

I attached pics to show what all i have, though theres speakers, and cables that arent shown.

Hey, thanks for doing all that. That logic board is the same one I have here. I think I want to try replacing this Q6360 part first. I'd hate to purchase that one for 10-20$ if I can fix this one first. Not because I don't want to spend the 10-20$ but because I'm almost certain you could get more for it on E-bay.

[budm]

Re: Dead Sanyo DP26648 logic board, need service manual.

That MOSFET pin out, PIN 1, 2, 5, or 6 are tied together and is the output. Pin 4 is an input. I avoid using the term SOURCE, GATE, DRAIN to be less confuse. So jump Pin 4 to anyone of the pin 1, 2, 5, or 6, then you will have 12vdc on the T-CON board and you shoulde see pictures.
Pin 3 is the contol pin that turns the MOSFET on/off. 8VDC should be there when the TV is ON, and about 0V when TV is OFF.