Sanyo DP42849 - No Power At All

[tom66]

Re: Sanyo DP42849 - No Power At All

Check resistance across C603, near D902.

[multimeter]

Re: Sanyo DP42849 - No Power At All

D951 is the one that gave me the low reading for such a big diode (compared to the others), and I've seen that particular diode go bad in other DP42849s, too.

D901 - 515
D951 - 209

d951 maybee a shottky diode,big difference,they have readings both ways but not shorted readings,test it out of circuit,these tend to go short,

i repaired a tv just recently with a shottky diode,weirdly it tested good in circuit,i removed it and it tested short

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Okay - which setting should I put my meter on to test C603? I have 200 Ohm to 20M.

I'll see if I can get that D951 out.

[multimeter]

Re: Sanyo DP42849 - No Power At All

Okay - which setting should I put my meter on to test C603? I have 200 Ohm to 20M.

I'll see if I can get that D951 out.

200 ohm scale

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

200 ohm scale

It's staying at "1". I tested C902 to make sure I was doing it right, and I got 15.7. Then I test other capacitors with the little "ZZZ" in the middle, and some of them I get readings, and some of them I get "1".

Okay no - I got my polarity confused even though I tried to pay attention to the + signs. Let me do it again.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Okay I was right - I get a "1" on C603 and 15.7 on C902.

I accidentally reversed polarity on some of the caps in the array near the PS pins and got confused.

[multimeter]

Re: Sanyo DP42849 - No Power At All

Okay I was right - I get a "1" on C603 and 15.7 on C902.

does your meter reading rise then drop off on that c603? c902 sounds suspect

[multimeter]

Re: Sanyo DP42849 - No Power At All

if you have hair drier,can you just heat those caps up for a minute,and power the tv up?and also the group of caps next to the connector with standby voltages etc,power tv up as if you want to watch it

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

does your meter reading rise then drop off on that c603? c902 sounds suspect

Nothing at all on that C603. Stays at "1". Let me triple check.

Okay I was right in the first place - I get readings on some of them in the array, and some of them just stay at "1". Let me redo them all and write down what I get.

[multimeter]

Re: Sanyo DP42849 - No Power At All

Nothing at all on that C603. Stays at "1". Let me triple check.

Okay I was right in the first place - I get readings on some of them in the array, and some of them just stay at "1". Let me redo them all and write down what I get.

check both ways,on c603 it could be open,the battery power in your meter should cause the cap to rise a little and drop back to "1",simular to a flick test with an analogue meter

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

C133 - 156.6
C123B - 156.6
C123A - 156.6/7
C123 - "1"
C122C - "1"
C122B - "1"
C122A - "1"

C952 - 15.7
C603 - "1"

C952 - "1"
C951 - "1"

I double checked that I put the red lead on the positive solder point.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

check both ways,on c603 it could be open,the battery power in your meter should cause the cap to rise a little and drop back to "1",simular to a flick test with an analogue meter

"1" both ways. Reading never changes.

[multimeter]

Re: Sanyo DP42849 - No Power At All

"1" both ways. Reading never changes.

ok,try heating the caps up with a hair drier,on high for around a minute,then try powering up the tv

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

ok,try heating the caps up with a hair drier,on high for around a minute,then try powering up the tv

Gotta run my mom to her doctor, so I'll do that when I get back.

Reinstall board, heat caps, plug TV in and press power?

About how many minutes should I heat them? I don't wanna ruin anything.

Thank you!

Sorry - read your message too fast. About a minute. Got it.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Oh, I should resolder that diode I pulled out, right? Or can I just stick it back in the hole?

[tom66]

Re: Sanyo DP42849 - No Power At All

You should solder it back in place.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Nothing

[tom66]

Re: Sanyo DP42849 - No Power At All

What's the part # of IC901?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

what's the part # of ic901?

a6069h sk803 23bp

[tom66]

Re: Sanyo DP42849 - No Power At All

Measure volts DC from pin 5 to pin 3. What do you get?

http://www.allegromicro.com/~/media/...Datasheet.ashx

Should be around 15V to 30V.