That definitely looks like a after thought fix, Kind of surprised to see a add on cap and a bodge wire on that board. I cannot speak for dahua, but I do know some electronics makers will use the same board but different caps (and other components) depending on the environment or 'Region" you live in. BTW I'm really enjoying this thread, I wish I had a few to tinker with, thanks for doing this.
Troubleshooting Circuitry in Old SD49225T-HN PTZ Cameras
- Thread starter guykuo
- Start date
I don't have these cameras either, but it is interesting stuff here.
Because Delta is in such a PITA access location, I've ordered a PTZ5A4M-25X to take its place rather than putting Charlie there.
I'd rather a reliable, new unit there and avoid excess rounds up/down. Gotta figure in the risk/benefit ratio.
Delta will still get worked on to see whether I can get its camera board to behave. I'm still interested in what exactly is wrong with Delta. I'm just not going to risk my neck and house damage in multiple attempts to fix it.
I'd rather a reliable, new unit there and avoid excess rounds up/down. Gotta figure in the risk/benefit ratio.
Delta will still get worked on to see whether I can get its camera board to behave. I'm still interested in what exactly is wrong with Delta. I'm just not going to risk my neck and house damage in multiple attempts to fix it.
I don't know if what I'm going to say will be correct, but why not monitor the camera through the Uart port and see what is happening, what information can it give us through the port?
Mostly because nobody has succeeded in connecting to the UART of the SD49225T-HN.
PTZ5A4M-25X arrived today and going through its initial evaluation.
1. New camera is big and heavy compared to the SD49225T-HN. I had seen the comparison in pictures, but didn't strike me as much as when placed side by side live,
2. It is a huge step up in night time sensitivity. Areas that were a dark murk on the SD49225T-HN look almost like daylight accidentally set for B&W despite a 6 msec shutter time and about 12 x zoom.
3. Most telling shot was with the PTZ5A4M-25X pointed at Orion's belt.
Orion nebula at 250 msec shutter speed and the camera autofocused.
The performance difference stunning - enough to feel okay about it near doubling cost vs the SD49225T-HN when that was new.
The problem now is whether I can esthetically fit the larger camera where Delta is mounted. It's enough a camera body size change that WAF is going to be in play. It's body will definitely need to be painted to match the house if I'm going to have any chance of it being okayed.
If not, Charlie is going to replace Delta and this new PTZ is going to get mounted on one of my camera poles.
PTZ5A4M-25X arrived today and going through its initial evaluation.
1. New camera is big and heavy compared to the SD49225T-HN. I had seen the comparison in pictures, but didn't strike me as much as when placed side by side live,
2. It is a huge step up in night time sensitivity. Areas that were a dark murk on the SD49225T-HN look almost like daylight accidentally set for B&W despite a 6 msec shutter time and about 12 x zoom.
3. Most telling shot was with the PTZ5A4M-25X pointed at Orion's belt.
Orion nebula at 250 msec shutter speed and the camera autofocused.
The performance difference stunning - enough to feel okay about it near doubling cost vs the SD49225T-HN when that was new.
The problem now is whether I can esthetically fit the larger camera where Delta is mounted. It's enough a camera body size change that WAF is going to be in play. It's body will definitely need to be painted to match the house if I'm going to have any chance of it being okayed.
If not, Charlie is going to replace Delta and this new PTZ is going to get mounted on one of my camera poles.
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First, moving Delta's camera module into Charlie moved Delta's problems into the Charlie camera body. That pretty much isolated Delta's issues as being in its camera module (which has the main camera board). Delta's current issues are not with its POE or PTZ boards. So, moved Delta's camera module back to its body for the rest of testing today.
Major board reflow work was performed on Delta's main camera module board. More details to follow, but Delta is better now, rather than being unreachable on network.
Once more stores its IP address settings, but really weird results regarding storing settings. Sometimes, they stick across reboots, It's also unpredictable which settings stick. Yes, I did factor default three times..
[Removed erroneous thoughts regarding EEPROM having a delayed write]
Major board reflow work was performed on Delta's main camera module board. More details to follow, but Delta is better now, rather than being unreachable on network.
Once more stores its IP address settings, but really weird results regarding storing settings. Sometimes, they stick across reboots, It's also unpredictable which settings stick. Yes, I did factor default three times..
[Removed erroneous thoughts regarding EEPROM having a delayed write]
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Hmmmnn. More testing suggests it's not a delayed write to EEPROM, but rather an unreliable write to EEPROM that doesn't always record new data
EEPROM is a Toshiba TC58BVG0S3HTA00 1 GBIT (128M x 8 Bit) CMOS NAND serial type EEPROM
RAM is Samsung K4B4G1646E-BYK0 DDR3 4 Gb 512M x 8
EEPROM is a Toshiba TC58BVG0S3HTA00 1 GBIT (128M x 8 Bit) CMOS NAND serial type EEPROM
RAM is Samsung K4B4G1646E-BYK0 DDR3 4 Gb 512M x 8
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Still really odd results regarding when settings get preserved. Overlay text, image condition settings, data bit rates all get saved, but not always.
PTZ presets get retained across reboots rarely, but once they DO get stored, they are reliably recalled.
It's as if the EEPROM is not able to be written to reliably, BUT that theory doesn't align with my also have successfully updating Delta's firmware today between three different versions. The firmware updates succeeded and ran. Those were definitely stored. I would expect those to be in EEPROM.
The Toshiba EEPROM chip is only $2 = $3, but a programmer to clone a new one would be another $200. Can't just install a blank EEPROM. It would have no firmware on it. At least, I don't think that would work.
I doubt it is worth my while to attempt replacing the EEPROM. Would have to desolder the old EEPROM, read it, write it out to a new chip, and resolder a new EEPROM.
Because I've already seen how completely screwy these PTZ's become when the RAM battery is low, I rechecked the new battery in Delta and it read only 2.45 volts rather than the 3.1 I got with Bravo's new battery. Swapped out Delta's memory battery for another new battery in Delta.
We'll let Delta stay running for a while and charge up the new battery. Also, gives me a chance to see whether its rebooting issue is still present.
I guess getting three out of four ill cameras back into working condition isn't horrible.
PTZ presets get retained across reboots rarely, but once they DO get stored, they are reliably recalled.
It's as if the EEPROM is not able to be written to reliably, BUT that theory doesn't align with my also have successfully updating Delta's firmware today between three different versions. The firmware updates succeeded and ran. Those were definitely stored. I would expect those to be in EEPROM.
The Toshiba EEPROM chip is only $2 = $3, but a programmer to clone a new one would be another $200. Can't just install a blank EEPROM. It would have no firmware on it. At least, I don't think that would work.
I doubt it is worth my while to attempt replacing the EEPROM. Would have to desolder the old EEPROM, read it, write it out to a new chip, and resolder a new EEPROM.
Because I've already seen how completely screwy these PTZ's become when the RAM battery is low, I rechecked the new battery in Delta and it read only 2.45 volts rather than the 3.1 I got with Bravo's new battery. Swapped out Delta's memory battery for another new battery in Delta.
We'll let Delta stay running for a while and charge up the new battery. Also, gives me a chance to see whether its rebooting issue is still present.
I guess getting three out of four ill cameras back into working condition isn't horrible.
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tibimakai
Known around here
Which Toshiba IC is that? I had an issue with a Toshiba IC in Kenwood navigation unit, and by reheating it with the soldering station, it worked again properly.
It is the Toshiba TC58BVG0S3HTA00 (larger TSOP 48 package) on the board. Come to think of it, the camera did go from being unreachable to functional after I hot air reflowed this area of the board. I had not thought about heat possibly making an EEPROM function better rather than just fixing bad solder connections.
tibimakai
Known around here
tibimakai
Known around here
Delta has not done its usual spontaneous reboots, but now staunchly refuses to store any new settings into permanent memory. Settings do take effect and remain active until next reboot (either soft or via disconnect ethernet cable.)
Also, Delta readily saves and imports its configuration. Once imported, the settings are active. The just won't survive a restart.
Possibly just specific pages in the EEPROM have gone bad - the ones used to store configuration settings. Delta DOES accept and store firmware updates. Going to be firmware gets written to a different EEPROM locations than configuration settings. Make me wonder whether Dahua put any effort into rotating storage amongst EEPROM pages to implement wear leveling. I'm suspecting they did not.
The RAM chip is 4X larger capacity than the EEPROM. It is even possible that Dahua keeps a live copy of firmware in RAM. If so, one might not even need to clone the EEPROM data to a new chip, just replace the EEPROM and let the systemwrite out a copy of itself during a firmware upgrade? That would be convenient, but again unknown likelihood.
I've ordered an Xgecu TL866-3G, ten EEPROMs and a TSOP48 adapter. It will be about a month before everything arrives from China. Could have gotten a bit things faster, but that would have cost more than I was willing to spend on a probable failed mission.
Will be an adventure in cloning the old EEPROM to a fresh Toshiba TC58BVG0S3HTA00. Pulling and reattaching chips to the board shouldn't be too hard, but I have zero experience with these programmers. Will the camera even survive that attempt? Will a fresh EEPROM fix the storage issue? Did Dahua do anything in the firmware to make EEPROM cloning impossible. Won't know for about a month.
Meanwhile Delta doesn't seem to be spontaneously reboot - That particular symptom seems most closely associate with little memory battery being bad.
The goodies being awaited shown below...
Also, Delta readily saves and imports its configuration. Once imported, the settings are active. The just won't survive a restart.
Possibly just specific pages in the EEPROM have gone bad - the ones used to store configuration settings. Delta DOES accept and store firmware updates. Going to be firmware gets written to a different EEPROM locations than configuration settings. Make me wonder whether Dahua put any effort into rotating storage amongst EEPROM pages to implement wear leveling. I'm suspecting they did not.
The RAM chip is 4X larger capacity than the EEPROM. It is even possible that Dahua keeps a live copy of firmware in RAM. If so, one might not even need to clone the EEPROM data to a new chip, just replace the EEPROM and let the systemwrite out a copy of itself during a firmware upgrade? That would be convenient, but again unknown likelihood.
I've ordered an Xgecu TL866-3G, ten EEPROMs and a TSOP48 adapter. It will be about a month before everything arrives from China. Could have gotten a bit things faster, but that would have cost more than I was willing to spend on a probable failed mission.
Will be an adventure in cloning the old EEPROM to a fresh Toshiba TC58BVG0S3HTA00. Pulling and reattaching chips to the board shouldn't be too hard, but I have zero experience with these programmers. Will the camera even survive that attempt? Will a fresh EEPROM fix the storage issue? Did Dahua do anything in the firmware to make EEPROM cloning impossible. Won't know for about a month.
Meanwhile Delta doesn't seem to be spontaneously reboot - That particular symptom seems most closely associate with little memory battery being bad.
The goodies being awaited shown below...
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I use my Xgecu quite a bit, lots of bang for the buck, far cry from 10 years ago, Its amazing how much it will do. I Don't know the half of it. The only issue I have with it is trying to maneuver their website for firmware updates. Looks like you got ALL the adapters, i have not had a need yet so let us know how it goes.
That Station is about 14 years old, been decent for what I do, Getting harder to find "Decent" Tips and heating elements for her. I do love my Andostar Microscope, I work on a lot of OLD crap so its been nice to actually see bad traces and cold joints.+1 Radio Shack - I'm still using spools of their solder and rosin flux
I seem to have dowloaded their software rar file, but yes their hosting system is a landmine field.
Haha, Everything is too small for my eyes at this stage in the game, Yea My wife might bring up the New scope is 3 years worth of car payments.