Sanyo dp42840 cap exploded

[tw2005]

Re: Sanyo dp42840 cap exploded

I have read of 13V supply issues and bad audio amp IC taking the 13V rail down. NORCAL715 has a good video on a particular model.

[whatusername]

Re: Sanyo dp42840 cap exploded

yes i have seen that video problem is his board and my board look different and i do not have those star test points to check voltages at

[whatusername]

Re: Sanyo dp42840 cap exploded

Can someone much more knowledgeable please point out the test points?

[tw2005]

Re: Sanyo dp42840 cap exploded

How about page 30 of the link I gave to the PDF? Seems well laid out. Shows everything incuding both powerfail checkpoints.

[whatusername]

Re: Sanyo dp42840 cap exploded

yes it does if u know how to read that which i do not.. its not as detailed as an actual board with markings.. im a novice with no prior training i do this to earn extra $$ because times are hard so i apologize in advanced for not knowing what to you would be the obvious. i will try and figure it out though

[Agent24]

Re: Sanyo dp42840 cap exploded

It's simple, it shows a general overview of the set's power distribution and various points of interest along with the components they connect to.

For example, if you wanted to check the the P-FAIL signal from the CPU, you can see it goes to pin 48 of the CPU (IC800). It even tells you that the signal should normally be high, and if it's low, it indicates a problem.

It also tells you that IC800 is on the main board.

So if you wanted to check that P-FAIL signal, go to the main board, find IC800, find pin 48 on that chip and measure the voltage on it.

Same for any of those other points. Locate the board and component, measure the appropriate pin. Easy

[tw2005]

Re: Sanyo dp42840 cap exploded

yes it does if u know how to read that which i do not.. its not as detailed as an actual board with markings.. im a novice with no prior training i do this to earn extra $$ because times are hard so i apologize in advanced for not knowing what to you would be the obvious. i will try and figure it out though

If you had stated you had looked at the document, but were having difficulty deciphering it then the response would match.

[whatusername]

Re: Sanyo dp42840 cap exploded

Ahh touche lol ok for now on i will try to explain better. Thanks tw and thank u agent for the explanation. When i take it apart again i will do the check. Im having back pains tonight so dont wanna aggravate it more by messing with tvs..

[whatusername]

Re: Sanyo dp42840 cap exploded

ic 800 pin 48 = 0.44v <-- not good
pin 23 4.5v
pin 18 4.5
power board 12v = 11.8
24v = 34.7
main board BL-on 3.3v = 2.79
unplugged inverter board connector same symptom

[whatusername]

Re: Sanyo dp42840 cap exploded

oops powerboard 24v = 24.7 not 34.7.. typo

Im lost as what to test next

[whatusername]

Re: Sanyo dp42840 cap exploded

well i know for sure the issue is on the main board i guess im gonna order the $25 smd components kit on eBay and try to save this board since i cant find one under $140
hopefully i can figure it out

[whatusername]

Re: Sanyo dp42840 cap exploded

well just spent $30 for 4 dumb chips on ebay that was supposed to fix the problem it came with a sheet to tell me which 4 to change and i did and tv still act the same way.. money wasted

[whatusername]

Re: Sanyo dp42840 cap exploded

Reviving this thread because im still working on this god forsaken tv... i finally bit the bullet after months of waiting for fleabay to show a main board and nothing i found a site that had one for $101.00 i got them to give me a discount and purchased it for $85 shipped and 6 month warranty.. it finally came in today and i installed it and nothing no click no power it does absolutely nothing at all i plugged power supply to old board and i heard the relay click.. plugged it back to new board and nothing.. now to me its looking like new board is doa but i could be wrong so i turn to you Guru's for assistance.. how should i proceed?

[whatusername]

Re: Sanyo dp42840 cap exploded

i did some troubleshooting using the service manual on page 1 of this thread and have found i get 5v standby on power supply going to main board but then on K8CTR pin 1 i got 0v which it should be 5v. so according to the SM i have a bad main board.. i double checked with my old board and i do get the 5v on K8CTR so the new board is definitely bad

[whatusername]

Re: Sanyo dp42840 cap exploded

i cannot find a main board for this tv for the life of me... i really need halp on trying to repair the current board. anyone with experience with this model please chime in

Its a dp42840-03 which is a very different board than the one that there is a video for.. N7AhE

[tw2005]

Re: Sanyo dp42840 cap exploded

ok well i did it n powered it on and no explosion this time lol but the tv is doing the classic power on/off symptom for this tv. i tried it 3 times i power it on relay click then powers off nothing on screen and 4th time it locks u out so u cant power cycle again till u unplug it and re plug it now to try and figure out what could be causing it

Have you looked at this? maybe some of this can be applied?

https://www.youtube.com/watch?v=KSYCn93pz6k

Edit: crap, sorry read first page not the second so that video did not help I guess?

[whatusername]

Re: Sanyo dp42840 cap exploded

correct it does not help..

[tw2005]

Re: Sanyo dp42840 cap exploded

ModuslinkPTS do board repairs but i guess this is getting to be an expensive almost uneconomical repair

[whatusername]

Re: Sanyo dp42840 cap exploded

yes it is considering it would be for resale and buying the repair kit and replacing the VR'S was a waste..

[tw2005]

Re: Sanyo dp42840 cap exploded

Well i hope someone who knows this model better can get you on track, I know the feeling, had a quick look at Modus and not 100% what version board you have but upwards of the $120. Not good, sorry.