IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

[mattbatt]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

TNY264AP. The resistor R7918 2.20 Ohms is 1/2W MOX Flame proof, it is for supplying the Voltage from AUX winding of the STBY transformer for running the PFC IC and the SMPS IC of the 12V/24V power supply. The R7914 is the fusible resistor for supplying B+ to run the IC.
You also need to check the snubber network D7908, 7909.
So do you have about 165VDC between the negative leg of the main filter cap and either legs of R7914?
DCV between the two legs of the running cap C7915?
pictures provided by shopjimmy.
http://www.shopjimmy.com/sharp-rdenc...pply-unit.htm#

Thanks for sharing your knowledge budm.
Is "MOX" shorthand for Metal Oxide Film?

[budm]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

You can get MOX film, or MOX wirewound type.
https://www.vishay.com/resistors-fixed/metal-oxide/

[mattbatt]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

thanks MOX wasn't a term I was finding on Mouser or Newark

[TheNostalgicGamer]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Just wanted to thank budm, and add another data point!
I had exact same symptoms as steinless on my RDENCA342WJQZ DPS-286AP-1 power board.

IC7905 was visibly damaged and was replaced.
R7914 was found to be open and has been replaced.

Lifting D7905 allowed the board to power up again.

[TheNostalgicGamer]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Markings on D7905 appear to identify it as a TZX15B.
https://cdn.badcaps-static.com/pdfs/...274456cd91.pdf

[inflex]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Hello all,

Have a 42" Aquos with DPS-226AP-1 and it brings up standby green light for about 30 seconds and then shuts off. If I try again in a minutes it'll bring it up for only a couple of seconds and shuts off again.

Voltage testing on TNY264 gives me 0.85V on EN/UV and 6V4 on BP.

I pulled and tested R7918 and it's okay, replaced it anyhow as a precaution

Might I just go ahead and order replacement diodes/caps (C7918, C7915, D7904, D7909, and IC7905) in one lot to cover all my bases?

[peanuts66]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Hi, Just wanted to say thanks. The info in this thread assisted in a successful repair. Keep up the good work.

[Jeff1]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Hi

I got a lc52d77x that has dos-286-1 power board but has different issues to this post as tv will power up run for a minute or two then turn off (including power light with no flashing) then turn back on after a minute or two then repeat over and over. Has anyone had this issue and know what is the issue. Everything works fine on the tv when on. When it shuts down you can hear a click from back of tv.

Thanks
Jeff

[budm]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Hi

I got a lc52d77x that has dos-286-1 power board but has different issues to this post as tv will power up run for a minute or two then turn off (including power light with no flashing) then turn back on after a minute or two then repeat over and over. Has anyone had this issue and know what is the issue. Everything works fine on the tv when on. When it shuts down you can hear a click from back of tv.

Thanks
Jeff

Please star a new thread with make and model name, then upload good clear pictures of the whole back side of the TV showing all the boards, the good clear straight shot pictures of the whole Top and Bottom side of the power supply board.
Does this board have AC_DETECT pin on the PD connector?

[Jeff1]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Please star a new thread with make and model name, then upload good clear pictures of the whole back side of the TV showing all the boards, the good clear straight shot pictures of the whole Top and Bottom side of the power supply board.
Does this board have AC_DETECT pin on the PD connector?

Thanks I will do that when I get home today

[Jeff1]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Please star a new thread with make and model name, then upload good clear pictures of the whole back side of the TV showing all the boards, the good clear straight shot pictures of the whole Top and Bottom side of the power supply board.
Does this board have AC_DETECT pin on the PD connector?

I can't sese it a AC_DETECT pin on PD connector but have noticed IC7905 is getting very hot before the tv turns off.

Sorry I just noticed auto correct changed board number should be DPS-286AP-1.

I seem to have all correct power voltages on the points I have tested until board seems to shut down.

Thanks

[budm]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

The pin listing is right there to the the left of the PD connector.
PD-9: AC_DET.
You must report the Voltage readings of all the pins, you must put down the pin names and follow by the Voltage readings when TV is OFF and when the power switch is activated so we we can easily see the pattern.

[Jeff1]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

The pin listing is right there to the the left of the PD connector.
PD-9: AC_DET.
You must report the Voltage readings of all the pins, you must put down the pin names and follow by the Voltage readings when TV is OFF and when the power switch is activated so we we can easily see the pattern.

Hi

I found a solution to the heat problem on the TNY264PN (IC7905)! I made a heat sink out of a piece of aluminium plate and bent it up to go onto the aluminium heat sink towards the bottom of the board and used a little bit of heat transfer paste between the top on TNY264PN (IC7905) and bottom of aluminium plate. Have ran tv all day now without a issue. Before I was getting maybe 3 to 4 minutes before it turned off. I know it's probably not the correct fix but is working for now. still unsure why it was getting hot but the tv is working fine apart from that TNY264PN getting hot

[mojos911]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Hi Everyone, one noob here and was wondering if someone had a good supplier for components. i'm especially having trouble find a new standby transformer for my DPS-286AP-1 Power Board. Any help would be great.

[budm]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Is the transformer broken? in which way?

[mojos911]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

The idiot that I am thought that there might be an inline fuse under the yellow tape and when I investigated this I cut the winding's with my blade. I know rooky mistake I hear you say and yep that's me. I have tried to get another one as I want to try and fix the set. I been doing research on why the standby power is not coming on and when I tested for the 5v output on the transformer there was none even though there was an input voltage of about 317v so I thought that there was a problem with that component. Any suggestions who might sell them, as I have tried Digikey, shopjimmy and a couple of local places hear in OZ but to no avail?

[budm]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

That is going to be tough to find.

[R_J]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

This is the best I can do: https://www.chinahao.com/product/40080933014/
Good luck

[mojos911]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Ok. So I have ordered from the site suggested and have DHL delivering. Lets see how we go. Thanks.

[i-didnt-start-the-fire]

Re: IC Number on DPS-286 AP/RDENCA336WJQZ Sharp power board

Thanks BUDM!!!
This thread helped me fix my SHARP LC-46D77X Power Board DPS-286AP-1 A - a few notes here for people that search for this model
Symptoms: no power at all not even the Standby light.
I bought a replacement kit from ebay that didn't cover my model of TV but the IC as explained by Tom66 in the second post of this thread could be used so I thought I had nothing to loose. It was to be used as spare parts if this didn't work.

The IC7905 had physically blown its top off, so I replaced that first and nothing all.
resistor R7914 (to the left of the large transformer) was open so replaced that still nothing.
I removed R7918 and D7908 they seemd ok but replaced them anyway still nothing

I read on (re-reading a few times to try and understand) talking about the Zener Diode
I was getting all the good readings that Steinless was getting but not the bad resistance reading he had with the ENUV.
But I pulled one leg of the zenner anyway and the TV powered up.
So I have two questions now that I will post separately.