Sanyo DP42746

[cmj21973]

Re: Sanyo DP42746

X-Tronic 4040 delivered today. Well test and practice with it on scrape board.

After I get use it, I'll begin rebuilding the upper and lower Y-buffers.
Replacement IC's have been ordered and should arrive in 2-4 weeks.

FYI
I hate spending $$$ on expensive replacement boards, but have no problem spending $$$ on tools that will pay for themselves in due time.

[cmj21973]

Re: Sanyo DP42746

I remove the bad upper Y-buffer IC and reassembled set.

Power it up and this is what I got.

Set is in HDMI mode, volume has red right arrow. The control buttons ( CH UP/DN, Power, & Vol UP?DN) won't change input. In fact all of them turn the set on and off.

While waiting for IC's from China , I'll order remote.

[cmj21973]

Re: Sanyo DP42746

Remote came in mail today.

Set wouldn't turn on by remote. Push set power button and remote still wouldn't do anything.

Press set power button, and hold and hold it, all the buttons on the remote would turn set on and off.

Press set power button and disconnect cable from K8F (set control keyboard). Remote has some control now. I was able to switch it off from HDMI, and I can receive a tv signal, but it scolls through inputs.

Pulled 1AA4B10N1650A board and found this. Actually found it before and didn't know it was a problem untill I got it off of HDMI.

Well order replacement 1AA4B10N1650A board in a couple of weeks and see if that corrects its. Unless someone disagrees and points me in another direction.

[cmj21973]

Re: Sanyo DP42746

Got my Y-buffer IC's in the mail today.

The "GOOD"
Price was reasonable (12pcs SN755870 for $48 + free S&H), arrived in thirteen days.

The "BAD"
As you can see in the photo, 12 SN755870 IC's taped to a piece of cardboard, bubble wrapped and placed in a padded envelope.

7 out of 12 are J041B2A G4 and the other 5 are 94AE7DT G4, more worried they weren't packaged in ESD packaging.

[cmj21973]

Re: Sanyo DP42746

Replacing 1AA4B10N1650A didn't sovle my problem, still scrolling through inputs.

I plan to replace LJ92-01270 and if this doesn't correct it, then I'm calling it quits.

[cmj21973]

Re: Sanyo DP42746

I replace the Digital Tuner 1AA4B10N18300. While It didn't correct the problem the set has it, did do something that it hasn't done before.

For the first time it displayed what I believe is the "On-screen Service Menu System".
It was still scrolling but through the options or data.

I've ordered the Logic board and it should be here by Friday or Saturday.

[cmj21973]

Re: Sanyo DP42746

I also found out what LED's on the Logic board indicate depending on the status. Like if they are on, off, or blinking.

[cmj21973]

Re: Sanyo DP42746

Well replacing the Logic board didn't resolve the problem.

[cmj21973]

Re: Sanyo DP42746

The problem with this set has to be either PSU or the MAIN.
I'm going to wash & clean all the boards. Maybe there is some surface contaminants causing a short.
If that doesn't work, I'll start checking caps.

[75tek]

Re: Sanyo DP42746

Please email both owners and service manual to twintek@live.com Much appreciation to you.....from 75tek

[scokljat]

Re: Sanyo DP42746

The problem with this set has to be either PSU or the MAIN.
I'm going to wash & clean all the boards. Maybe there is some surface contaminants causing a short.
If that doesn't work, I'll start checking caps.

And? Did you repair your plasma? I belive you checked if one of the buttons on the front panel is not stuck and because of that set is scrolling inputs... it's not stupid to ask ;-)

Cheers,

Suad

[tom66]

Re: Sanyo DP42746

My guess would have been a stuck button, not a main board issue.

[arman960]

Re: Sanyo DP42746

Remote came in mail today.

Set wouldn't turn on by remote. Push set power button and remote still wouldn't do anything.

Press set power button, and hold and hold it, all the buttons on the remote would turn set on and off.

Press set power button and disconnect cable from K8F (set control keyboard). Remote has some control now. I was able to switch it off from HDMI, and I can receive a tv signal, but it scolls through inputs.

Pulled 1AA4B10N1650A board and found this. Actually found it before and didn't know it was a problem untill I got it off of HDMI.

Well order replacement 1AA4B10N1650A board in a couple of weeks and see if that corrects its. Unless someone disagrees and points me in another direction.

all my lights are solid now with new y-sus and buffer board. But logic board light still blinking. could you please tell me what might be the issue? you have does a lot of work on this tv. I still do not have any picture.

[Mike Jenk]

Re: Sanyo DP42746

Hey,
Any luck with the repair? some one is giving me one of these.

[Zornocology]

Re: Sanyo DP42746

Hello, I have the same TV. The Y-sus main board is tesing ok but the buffers are burnt. did you have any luck rebuilding the buffers? How did you remove the heat sinks? On mine they are hot glued onto the ICs.

[tocold4u2]

Re: Sanyo DP42746

I just picked a free set. i had the dmm on and voltages all read goo i have a solid green light on trouble shoot board i think it is for va or ve. cant remember...but within 5 min the top buffer blew so im looking for a shorted nosfit on y main...hope to get this fixed cheap

[TechStudent]

Re: Sanyo DP42746

I have a Sanyo DP42746, I plug in the HDMI cable to the TV. Signal runs through. However when I unplug the HDMI and plug in cable there is no signal coming through the cable side. I need help. I don't want to end up paying 600-700 dollars worth of repairs since I am just a career and technical center student. After working on TV's for electronic repair I am stumped to a degree.

As I said,
HDMI > Signal
Cable > N/A
All other Jacks > Signal

If you can help, I would be grateful.

[steves7839]

Re: Sanyo DP42746

You might have to use the setup menu to put the TV in cable mode from antenna mode.