dp42740 sanyo green light on/off power fail mode

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

took me a minute but the only components it shows inline are R1682, L1673 and L1674. If you have 15v at p24 test point one of those has to be open or you would have voltage to your diode 1671. R1682 and R1683 look like they form a voltage divider, R1682 is specified at 0 ohms, the manual doesn't give a value for R1683 you might have to get out your magnifying glass and see if you can read the numbers.

[lively]

Re: dp42740 sanyo green light on/off power fail mode

lol man this is weird , r1682 good has 15.6 vdc , L1673 good has 15.6vdc , L1674 good has 15.6 vdc , ( all of course go low once audio is not picked up .. and both diodes did cero out to O ohms and both are 0 ohm diodes ... SMH !!!! i will refuse to let this set take me out !!! and the p24 test point has 15.6vdc as well

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

At the beginning you stated the audio power was the only one giving error, where did you measure the error if not at D1671?

[lively]

Re: dp42740 sanyo green light on/off power fail mode

at the beginning i was testing off the test point on top side of board at 13v audio power , but i just checked at D1671 and it has 4.678vdc- 5.100vdc when i switch leads when i applied power ..

[Agent24]

Re: dp42740 sanyo green light on/off power fail mode

Which exact service manual are you looking at? I looked on Tom's site and there are 20 files which come up for "dp42740"

[lively]

Re: dp42740 sanyo green light on/off power fail mode

J4HE the first one thats on the list

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

So does the 13v test point not come up at all or was it low? It looks to me as if that feedback circuit is working.

[lively]

Re: dp42740 sanyo green light on/off power fail mode

it reads 0.000

[lively]

Re: dp42740 sanyo green light on/off power fail mode

thats where i stopped and said ok what am i missing .. i need help, i tested all the way to R1684 (470) one side is ground and the other had 15.6vdc the last point i cannot find on board is CL1670

[lively]

Re: dp42740 sanyo green light on/off power fail mode

and that is a replacement board from shopjimmy.com that i just got last friday

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

was your original board the same? You would be better off looking for L1674 and L1675 as cl1670 is just a junction or test point not a part. I will give you a great tip someone gave me if you hit control F on your keyboard in adobe reader it opens the find tool and you just type in the part you are looking far and it highlights it for you each time it appears in the document, just hit the arrows to advance or go back

[lively]

Re: dp42740 sanyo green light on/off power fail mode

yes the old one has same reading and has 15.6v at c1670

[lively]

Re: dp42740 sanyo green light on/off power fail mode

is there a way to jump this out to bring the set up >?

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

In my mind that means it unlikely to be the main board causing the trouble. That error maybe a red herring, what haven't you replaced so far? we know for sure the ss was bad as it was shorted yes? I think that just leaves the sn board, you resistance checked it correct? it may have a fault beyond a relay or switched fet and not show until it comes up. I think maybe run through these steps one more time just for giggles. Edit just noticed this one has a control board hiding behind the main, may need to look that one over as well.

6) Disconnect (SN2 connector)
Is TPVSUS (SN2, pin #1, 191V) on SN Bd. shorted to chassis Gnd?
yes, shorted = SN Bd. N/G
not shorted = go to step #7
7) Reconnect SN2 and disconnect (SS11 connector)
Is TPVSUS (SS11, pin #1, 191V) on SS Bd. shorted to chassis Gnd?
yes, shorted = SS Bd. N/G
not shorted = Power ON TV, and check TPVSUS (SN2, pin #1) for 191V before shutdown
If no output, = SMPS N/G
If 191V OK is before shutdown, SN Bd. may be defective (can not be sure)
Reconnect SS11 Connector
8) Is TPSN1 (14V) shorted to chassis Gnd?
yes, shorted = SN Bd. N/G
not shorted = go to step #9
9) Measure resistance across C909 & C959 (146V across cap.) on SN Bd..
If resistance is only a few ohms across either capacitor, the SN BD. is defective.

Im off to bed for the night, check back in the AM

[lively]

Re: dp42740 sanyo green light on/off power fail mode

roger thanks for the help .. i will run through and report back

[lively]

Re: dp42740 sanyo green light on/off power fail mode

all is good and if i understand correctly the manual is stating to check across each cap c909 - 1.6MEg ohm c959- 18MEg ohm and both fluctuate up and down with i switch leads .. but across the 2 i have 146vdc as stated ... looking forward to the reply .. thanks again

lively

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

Does the control board have the blinking led on it? have you tried swapping in your original power board? Since you have 2 power and main, I would try both combinations of old and new. Did the power board stay up with the lvds unplugged? Running out of ideas here.

a) Unplug LVDS Cable (40 pin connector) from Main to Digital "D" Bd. (D5 connector) behind Main:
This will eliminate the Main Bd., and see if the SMPS will power ON automatically, and remain ON.
Plug the AC Cord to power (do not push the Pwr Key on the TV) and see if the SMPS will power ON.
If the SMPS powers ON and remains ON, then the Main Bd. should be tried. If the SMPS continues to shutdown
then resistance checks (#1-#9) below should be done.

[lively]

Re: dp42740 sanyo green light on/off power fail mode

no blinking lights and when i unplug d25 and others stated i plug the set up and hear the relays click and heat sinks are getting warm .. i mean only thing i havent replaced is the SN board .. lol what the hell ? this thing should be powered up by now right >?

[lively]

Re: dp42740 sanyo green light on/off power fail mode

i ordered the SN board , thats the only one left and if that don't do it then i will upload a tannerite explosive ending to this $160.00 project , but if that makes it come back to life then ill just return the other boards and be out the return shipping

[Caleb]

Re: dp42740 sanyo green light on/off power fail mode

Yeah I would think it would work, but Ive had a couple in the past that I gave up throwing money at. I would ship all the boards back and eat the restock fee at least you wouldnt be throwing money away, save the tannerite for the cracked panels.