Help - Damaged PSRAM, Need replace Adelaide

[Daniel Flakelar]

Hi All

Stupid me, I accidentally put the micro in the socket offset by 1 pin when doing the inital test of the LEDs.... needless to say the PSRAM got hotter than the sun :-( 

Anyone know where I can get a replacement here in Adelaide..... Not trying to bash retailers but Jaycar is useless these days.

Was hoping to get this project up and running before newyear...

Dan

[Charles Hicks]

Can't help you here, but this is what you're looking for.. 

• IPUS IPS6404LSQ
• ESP PSRAM64H
• AP 6404L-3SQR
• Lyontek LY68L6400S

[Daniel Flakelar]

Hi

Thanks for the part numbers, cant get any here so ill just shelve the project and get back to it some other time. 

Thanks

Dan

[villa...@gmail.com]

You can get them here (Aliexpress) if you're prepared to wait a few weeks  https://www.aliexpress.com/i/4001074797663.html

Colin

[Charles Hicks]

Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x3f (SPI_FAST_FLASH_BOOT)
configsip: 188777542, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:4492
load:0x40078000,len:13324
ho 0 tail 12 room 4
load:0x40080400,len:3796
entry 0x40080624
I (353) psram: This chip is ESP32-PICO
E (354) psram: PSRAM ID read error: 0xffffffff
E (354) cpu_start: Failed to init external RAM, needed for external .bss segment
abort() was called at PC 0x40081c33 on core 0

ELF file SHA256: 8a0e39da91675446

Backtrace: 0x4008acb8:0x3ffe3c10 0x4008b091:0x3ffe3c30 0x40081c33:0x3ffe3c50 0xD

Would anyone know if this is an indication of bad psram or something else? I've tried replacing it, more than once, as well as rewriting and even replacing the pico module. Is there a way to test psram chips?

[villa...@gmail.com]

I've replaced the psram chip a couple of times now over the years. Last one was due to possibly a static issue,,  when I connected my Wyse terminal. Any rate when replacing the IC it's easy to damage the connecting track to the pins of the psram. I suggest, if you've not already done so, to do a continuity check from the actual pin of the psram to each connecting point the track runs to. (As well as any shorts between the pins)

Colin

[Charles Hicks]

The continuity is fine, though while checking it I realized I hadn't put the extra 3 pins on each side of the pico.

Having done that my error has changed. Now I am getting...

rst:0x10 (RTCWDT_RTC_RESET),boot:0x3f (SPI_FAST_FLASH_BOOT)

configsip: 188777542, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4

load:0xffffffff,len:-1

ets Jun  8 2016 00:22:57

[Charles Hicks]

I replaced the PSRAM again and it didn't come up until I replaced the pico with the original. I went through 4 ram chips and a couple picos and I don't know what was actually not working.

While playing I wrote the firmware to an ESP32CAM module and it actually worked. Can't get it into station mode or to boot a floppy without switched tho.