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

[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?

[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

[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.

[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

[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

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?

[kreeger]

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

Just a heads-up that I'm lurking on this thread today. My Sharp Aquos powers off about every 2-3 minutes while in use. I have never attempted circuit board repair before so this is all new to me, but I'll post back with my findings. Hopefully it'll be helpful to others.

This afternoon I replaced R7918 but it didn't seem to do the trick. I'll be replacing R7914 next, since it seems like some folks have had luck with that.

[matee]

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

https://www.youtube.com/edit?o=U&video_id=jkJ5t00p90w

I checked the voltage in the clips in the YouTube upload I see. Every power point is in the printed circuit board. I removed the circuit board to check. Any member Can you suggest me to check if MB is good or not? Can I make MB work on my own?

[matee]

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

Please Help me My TV LCD Sharp model LC-46A66M does not turn on. It


Power & inverter DPS-226AP-1 RDENCA342WJQZ

[RMCUNIVERSAL]

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

Dear budm and every one try to help.

As promised,

I do changed the IC TNY264 and R7914 and every thing worked perfect.

Thanks every one

[RMCUNIVERSAL]

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

Dear budm,

Thank you so much for your reply and explanation,

I follow your instructions and I find IC TNY264 is damaged.

Will replace it with new one + R7914 and will update the results.

I check the D & R at standby power supply and all are ok.

Thank you budm.

[budm]

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

Check pin 5 and GND pin of that SMPS IC as shown in post 71.

[RMCUNIVERSAL]

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

Hi Budm,

I have same issue, I find R7914 open ans I change it using resistor 2.2ohm 1W, when I on the power the new resistor directly blow,

Please advice

[fixertech]

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

I will buy shop jimmy repair kit, but it's come with a 5.5ohm resistor for 7914, is good like this?

[budm]

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

Sorry, typo, it is pin 5 the Drain pin.

[fixertech]

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

Correction, is your IC TNY264? If it is, then it will pin 6 and GND.

there's no pin 6 on the IC....

[budm]

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

Correction, is your IC TNY264? If it is, then it will pin 6 and GND.

[fixertech]

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

I already indicated in my answer.

i put the tester on 200 ohm, pin 8 and GND give to me 0.3 ohm is ok like this?

[budm]

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

Thanks!, but i no have a lot of skills on electronics, only the basic, can you show me where to test, and what to test?

I already indicated in my answer.

It blew open circuit because you have shorted component on the output side of the R7914, check the resistance of the STBY SMPS IC7905 PIN 8 and Primary circuit GND for very low resistance.

[fixertech]

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

It blew open circuit because you have shorted component on the output side of the R7914, check the resistance of the STBY SMPS IC7905 PIN 8 and Primary circuit GND for very low resistance.

Thanks!, but i no have a lot of skills on electronics, only the basic, can you show me where to test, and what to test?