Sharp LC-60SQ15U TV DPS-167CP - No power

[dskall]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Check caps. and resistors on pin 5.

[romasik]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

OK, I found pictures at shopjimmy.
C7818 is a snubber cap for the PFC Diode D7805, its typical value is about 220 pf 1KV, but I always replace it with 2KV rating instead, it is commonly failed caps in Samsung power supply also.

Please help me frend

[romasik]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Hello, please help me i have same problem on my Sharp Aquos 60LC635E No 5V power, tv dead . Blown R7900 and short D7950 . I changed it, than blown R7900 again . D7950 ok. I change IC7903 and cap on 5 leg 50V 47u and R7900 never blown again but 5V not( I do not know what to do . On big two cap 315V, on 5 leg IC7903 9V this very low for start A6069H . Datasheet say min 13V.

Please Help me. board power supply dps-162KP B RUNTKA932WJQZ

[lechugaAmir]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Hola amigo me pasa mismo 5.8v muy bajo varias cambie ic que va solución?

[veekay]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Well little update, replaced D7950 and R7900 and the TV is back to life. After replacing R7900 pin 5 jumped up to around 15-16V.

[veekay]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Sorry to necro an old post, but felt it might be better to keep relevant info in the same spot.

Ran into the same issue with my TV over the weekend. Zero power, lights, nothing on standby, etc.

D7950 tested as bad, so I have ordered a replacement for that.

Decided to check the other things recommended here, but am stumped on how to tell if IC7903 is bad. Still pretty new to this.

Like egoh I get high voltage (165.3v) on pins 8 and 7, but my pin 5 gets 9.6v. Pins 1 and 2 are .2mv and pin 4 is 10.2mv.

On R7900 I am getting 2.7-3ohm when powered off, and higher when on. The resistor also has continuity.

[johnz]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Ok I got it working.. Thanks everyone for showing me where to start.

[johnz]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

I have the IC7903 but i don't know how to order the R7900 on digikey..its red, red, gold gold, silver. Thanks.

[R_J]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

R7900 seems to be 2R2Ω .5w If it is open I suspect that IC7903 is defective.
I see caps similar to where C7818 is located as 470pf 2kv

[johnz]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Do you know the part number to the resistor R7900 or if some one knows the part #..?? Thanks.

[budm]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

OK, I found pictures at shopjimmy.
C7818 is a snubber cap for the PFC Diode D7805, its typical value is about 220 pf 1KV, but I always replace it with 2KV rating instead, it is commonly failed caps in Samsung power supply also.

[budm]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

I don't have access to sharp dps-167cp-a schematic but C7818 has blown on my board and I can't tell what the values are on it. Can you help me with a part number?
Thanks

Can I see good clear picture of this cap and its location?

[amoore1952]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

I don't have access to sharp dps-167cp-a schematic but C7818 has blown on my board and I can't tell what the values are on it. Can you help me with a part number?
Thanks

[amoore1952]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

sorry it has dps-167cp a power supply board in it.

[amoore1952]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Check fusible resistor R7900 (2.2 Ohms) to see if it is open.
IC7903 is the STBY SMPS IC which drives the power transformer T7901, D7950 is the rectifier diode on the Cold side.
You should run the power supply board by itself to see if you do have STBY Voltage or not.

HI, new to site. I am basic electronics skill. I heard a pop in the back of my sharp lc-60le650u tv last night. indicator light flashes 2 long 2 short which I think means 13V line on power supply bd and I have no picture. took off back of tv looking for bad cap or something obvious but everything "looks" ok. any ideas where to look or what to check.

[Hcarter]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

The diode is an SB2100, Digikey P/N 1655-1516-1-ND.

[Hcarter]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Sorry for the delay, I just saw your message. The diode is an SB2100, Digikey Part Number 1655-1516-1-ND. I have 9 extra and would be happy to mail you a few for free.

[Halcyon22]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Update: I figured the shorted diode was the culprit so after replacing blown R7900 and shorted D7950, I powered up the board and R7900 immediately blew, but D7950 was still good. I then replaced IC7903 and R7900 and the board powered up normally! The TV works perfectly!

Thank you everyone for all the help!

What was the specs on the D7950 diode? Mine blew and the text on it is unreadable.

[Hcarter]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Update: I figured the shorted diode was the culprit so after replacing blown R7900 and shorted D7950, I powered up the board and R7900 immediately blew, but D7950 was still good. I then replaced IC7903 and R7900 and the board powered up normally! The TV works perfectly!

Thank you everyone for all the help!

[egoh]

Re: Sharp LC-60SQ15U TV DPS-167CP - No power

Hi egoh,
I have the exact same board with the exact same symptoms (160 VDC at BD7001 output and no voltage at any PD connector pin). Did you ever figure it out?

Sorry, I got busy with car and house repairs. I ended up replacing the board and haven't circled back to diagnose the original failed board.