Service manuals - going down

[tom66]

Re: Vestel Tool V1.1 DUMP NAND / SPI HELP..

You can try to alter the boot config file. The boot config file can be saved to a USB stick. It uses standard UBoot commands, open source software. Easy enough to write a config file that dumps NAND if you want.

Good luck and let us know how it works.

[tom66]

Re: Samsung UN50MU6300 burnt tab bond

Nothing you can do, as I'm fairly sure that's a column driver so removing it will mean you get a big black bar down the panel.

[tom66]

Re: Bush DLED40127FHDCNTD - Software dump

You can look into editing the boot configuration file on an update USB.

These vestel sets use u-boot which is open source software. It is what loads the flash memory correctly.

It is possible to edit the u-boot txt file to make it copy the flash to a USB drive, instead of load the flash image. However, do be aware, that when messing with things like this, it is possible to brick your working set, if you get a command wrong.

[tom66]

Re: samsung ht z310 - FAN_CHK error

I think this fan circuit has to be one of the most complicated I have seen, a temperature sensor control circuit would have been so much easier but instead it is based off volume level. As a result it needs additional fault detection circuitry and many analogue components. Very odd!

[tom66]

Re: Sony OLED TV 4 red blinking lights

I suspect you will find that the thin lines are causing something to overheat which means the T-con will shut down.

I guess you could see what is overheating (a thermal camera helps, but if not, you may be able to use freezer spray carefully applied), and as a temporary fix, may be able to heat-sink it sufficiently such that it stays cool and continues operating. A likely guess will be a DC-DC converter on the T-con board. It is unlikely to be on the power supply.

However I would never consider this a long term fix...

[tom66]

Re: LG 42PQ6000 plasma

I would advise checking Vs, Va, -Vy, Vsc and Vzbias voltages are z all correct, especially Vs when a bright image is displayed. We have seen PSUs struggle to regulate Vs under high load.

Also run the test pattern mode

[tom66]

Re: Service manuals - going down

Bump so more can see this.

I think Topcat offered a while ago but I'm not sure on what the status of that is. I'll have to ask again.

[tom66]

Hi all

As you all know I am not as active on Badcaps.net forum as I would otherwise like to be, for a variety of reasons, but mostly related to workload.

The toms-service-manuals.com domain will be expiring next month, and the web hosting will be expiring a few months after that.

I'll likely move to a cheaper webhosting provider (DreamHost is $120 a year, and I basically only host my CV and service manuals now there; the shared server is otherwise underutilised), but I'm wondering if the service manuals site is loved enough to continue it.
...

[tom66]

Re: LG 55EC930V OLED - 3 Second Power No Display

Could you take a picture of the bottom side of the board? Curious about something.

[tom66]

Re: PN43D490A1DXZA power supply broke?



VS ON not VS!!! very bad if you jump to VS will destroy your power board.

VS ON needs to go to STBY 5V and PS ON to GND needs to be jumpered as well
Both control board and main board should be unplugged.

TVtimmy is correct that X-main is likely fault as it is common on this model, but do this check before....

[tom66]

Re: PN43D490A1DXZA power supply broke?

Unlikely to be power board if Vs is present, even if dropping. Control board will shut down power board if there is a fault.

To test properly you would need to disconnect control board and main board from power board, then jumper VS ON to 5V and PS ON to GND to force the rails on. if they are steady without any board connected your power board should be OK.

[tom66]

Re: Samsung PN60F8500AFXZA, can't determine X or Y failure

Are you using 120V light bulbs? Two in series?

[tom66]

Re: Late model "40 RCA LED LCD, upper 1/3 screen distortion, no T-Con board

100% bad panel
It's a Samsung panel and this is a common failure.

[tom66]

Re: Samsung PN60F8500AFXZA, can't determine X or Y failure



I've encountered it on a few sets but I think it's not an issue on these newer Samsung sets. Reason being that the Y-main and X-main actually go to very low load levels under dark picture levels so it would be untenable to have the PSU shut down every time!...

[tom66]

Re: "Solid State" media failures



Yes, that would be how it works.

You having 100 TB would certainly make that harder! I have at most 8 TB of data, about 2 TB of which is backed up (the rest is easily recoverable stuff, or junk like Downloads folder.)...

[tom66]

Re: "Solid State" media failures



Well, I have 80Mbit downstream, but I don't even have to use that.

The company will send you a 4TB HDD for ~$200 but if you send that back to them, the service is free of charge - you effectively just pay the postage to send it back and they give you a full refund, or you can decide to keep the drive for the $200 deposit. So maybe $20 to get the data back in a few days.

Other companies have similar policies, but Backblaze seemed to be one of the most attractive in terms of customer service and software....

[tom66]

Re: "Solid State" media failures



So my solution was to back it all up using my 20Mbit (upstream) connection which took a while! About two months all in with it running in the background. But it did work.

I don't keep the stuff on the cloud. It's only used as a backup method, the data is only there in case a failure occurs.



I use BackBlaze myself with an encryption key. The encryption key is partially written down on a piece of paper, which is stored in a fire safe in my detached garage and a second copy is stored in...

[tom66]

Re: "Solid State" media failures



No... some areas will wear out sooner, but the failures will be random in nature. So it is reasonably likely that several sectors will fail in a small span of time if the drive is used in a typical fashion (and the wear levelling works well)



True - to a point - but there is no current way for SATA SSDs to indicate that they are becoming a bit "latent" and that you need to wait to read some sections. So the kernel (Windows, Linux, whatever) will keep hitting sectors and if it gets...

[tom66]

Re: "Solid State" media failures

*

Another reason not to have critical data on any single medium *at all*. Backups, folks! Backups! Three backups, two different locations and at least one different type of medium. But if you're too lazy to do that, then at least use an online service e.g. BackBlaze....

[tom66]

Re: "Solid State" media failures



In my experience, it's typically catastrophic because the failures begin at similar times across the drive.

Once a sector fails on an SSD, the drive will spend a long time attempting to recover it. This will lead to read latency climbing significantly and random sector failure will also likely cause issues with filesystems.

With our STBs, when a failure occurred in the onboard eMMC, the Linux kernel spent about 20 minutes spewing out messages on dmesg/serial terminal before I had a usable terminal....