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

[budm]

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

http://www.electronica-pt.com/esquem...s-304bp-25419/

schematic dps 304

I got error when I try to open the PDF saying it was not created properly.

[tech3627]

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

I was able to open the PDF, but it was one page without specs of any of the parts in the diagram. I ordered both some 1/2W and 1/3W resistors. I'm not sure what to install in the board. I did find some 1/4W resistors on another website that I can order, just not sure if I need to.

[ayeminko]

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

Hi, I have Sharp LC-42A66M and having intermittent power off problem. TV will shut off of a few seconds[no green/red light at front LED] and it came back. It happens once/twice a day. And, sometimes no problem for a few days.
I though it was bad cap and opened up and checked the power supply board.
But, there was no bloated cap on board.
Power supply board is DPS-226AP-1 (RDENCA340WJQZ)
Is it possible that TNY264AP is having intermittent issue?
Should I just replace it?
Thanks in advance.

[mattaiusthegreat]

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

I just wanted to say thanks for this thread, it got by DPS-286ap up and running again. I ended up replacing R7914 (failed open), R7918 (seemingly OK at 2.2ohm), IC7905, D7908, and D7905 (showing around 400ohm).

[fixertech]

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

I just wanted to say thanks for this thread, it got by DPS-286ap up and running again. I ended up replacing R7914 (failed open), R7918 (seemingly OK at 2.2ohm), IC7905, D7908, and D7905 (showing around 400ohm).

Did you replace all the components or only the R7914? when i replace the R7914 always blows.

[budm]

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

Did you replace all the components or only the R7914? when i replace the R7914 always blows.

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?

[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

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

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

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

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

[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?

[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

[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

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.

[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

[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

[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?

[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.