Author Topic: Swapping LCD Panel EEPROM (Read 2756 times)

EBW · « **on:** August 14, 2023, 12:52:54 pm »

Hi, I have two LCD panels (One cracked screen, One corrupt EEPROM). If these panels share the same specs (32", 720P, RGB Vert. Stripe, 1366X768, 60Hz, LVDS [1 ch, 8-bit] , 12V), can their EEPROMs be swapped?

amyk · « **Reply #1 on:** August 14, 2023, 01:36:41 pm »

Explain more? What EEPROM, the EDID one?

wraper · « **Reply #2 on:** August 14, 2023, 01:46:27 pm »

Probably will work but not necessarily. Would be better to find original EEPROM dump.

EBW · « **Reply #3 on:** August 14, 2023, 01:51:01 pm »

Hi amyk, the EEPROM on the LCD board. I would need to do some further disassembly to get the EEPROM part number. Would that help?

EBW · « **Reply #4 on:** August 14, 2023, 01:53:19 pm »

Hi wraper, Unfortunately I don't have a EEPROM programmer

wraper · « **Reply #5 on:** August 14, 2023, 01:58:38 pm »

Quote from: EBW on August 14, 2023, 01:53:19 pm

Hi wraper, Unfortunately I don't have a EEPROM programmer

How do you know it's corrupted? Programming I2C EEPROM is not hard. If you have Raspberry pi or Arduino for example.

EBW · « **Reply #6 on:** August 14, 2023, 04:15:58 pm »

All of the LCD board voltages are correct and it displays a bright white screen. The original mainboard suffered a processor failure and a replacement mainboard did not correct it. I found some Youtube videos that showed a corrupted EEPROM was the cause. Unfortunately, I don't have access to any EEPROM programming hardware.

fzabkar · « **Reply #7 on:** August 14, 2023, 05:41:29 pm »

I thought that EDID EEPROMs were on the mainboard rather than the panel. :-?

Anyway, you can find the EDID for your monitor(s), past and present, in your Windows registry.

Code: [Select]

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY\AOCA781\1&8713bca&0&UID0\Device Parameters]
"EDID"=hex:00 ff ff ff ff ff ff 00 05 e3 81 a7 b8 8a 00 00 16 0e 01 03 68 22 \
  1b 78 2a a6 9c a1 5a 4b 98 24 16 4c 57 bf ef 00 81 80 01 01 01 01 01 01 01 \
  01 01 01 01 01 01 01 30 2a 00 98 51 00 2a 40 30 70 13 00 78 2d 11 00 00 1e \
  00 00 00 ff 00 30 38 30 34 35 4a 41 30 33 35 35 31 32 00 00 00 fd 00 37 4b \
  1e 53 0e 00 0a 20 20 20 20 20 20 00 00 00 fc 00 4c 4d 37 32 30 2f 4c 4d 37 \
  32 30 41 0a 00 fa

Code: [Select]

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  00 FF FF FF FF FF FF 00 05 E3 81 A7 B8 8A 00 00  .ÿÿÿÿÿÿ..ã.§¸Š..
00000010  16 0E 01 03 68 22 1B 78 2A A6 9C A1 5A 4B 98 24  ....h".x*¦œ¡ZK˜$
00000020  16 4C 57 BF EF 00 81 80 01 01 01 01 01 01 01 01  .LW¿ï..€........
00000030  01 01 01 01 01 01 30 2A 00 98 51 00 2A 40 30 70  ......0*.˜Q.*@0p
00000040  13 00 78 2D 11 00 00 1E 00 00 00 FF 00 30 38 30  ..x-.......ÿ.080
00000050  34 35 4A 41 30 33 35 35 31 32 00 00 00 FD 00 37  45JA035512...ý.7
00000060  4B 1E 53 0E 00 0A 20 20 20 20 20 20 00 00 00 FC  K.S...      ...ü
00000070  00 4C 4D 37 32 30 2F 4C 4D 37 32 30 41 0A 00 FA  .LM720/LM720A..ú

Code: [Select]

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY\PHLC081\4&70dd7cb&0&UID16843008\Device Parameters]
"EDID"=hex:00 ff ff ff ff ff ff 00 41 0c 81 c0 dc a4 00 00 22 15 01 03 6e 30 \
  1b 78 2a 0a 45 a7 54 4a 99 25 11 50 54 bd 4b 00 d1 c0 81 80 95 0f 95 00 b3 \
  00 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c 45 00 e0 0c 11 00 00 1e \
  00 00 00 ff 00 55 48 42 31 31 33 34 30 34 32 32 30 34 00 00 00 fd 00 38 4c \
  1e 53 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 50 68 69 6c 69 70 73 20 32 \
  32 36 56 4c 00 30

Code: [Select]

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  00 FF FF FF FF FF FF 00 41 0C 81 C0 DC A4 00 00  .ÿÿÿÿÿÿ.A..ÀÜ¤..
00000010  22 15 01 03 6E 30 1B 78 2A 0A 45 A7 54 4A 99 25  "...n0.x*.E§TJ™%
00000020  11 50 54 BD 4B 00 D1 C0 81 80 95 0F 95 00 B3 00  .PT½K.ÑÀ.€•.•.³.
00000030  01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C  .......:€.q8-@X,
00000040  45 00 E0 0C 11 00 00 1E 00 00 00 FF 00 55 48 42  E.à........ÿ.UHB
00000050  31 31 33 34 30 34 32 32 30 34 00 00 00 FD 00 38  1134042204...ý.8
00000060  4C 1E 53 11 00 0A 20 20 20 20 20 20 00 00 00 FC  L.S...      ...ü
00000070  00 50 68 69 6C 69 70 73 20 32 32 36 56 4C 00 30  .Philips 226VL.0

Years ago there was a tool called PowerStrip which enabled EDID to reprogrammed via Windows. Perhaps there is a similar tool today?

https://entechtaiwan.com/util/ps.shtm

To confirm the integrity of the EDID, add all the bytes. The sum should be 0.

EBW · « **Reply #8 on:** August 14, 2023, 07:21:26 pm »

Hi fzabkar, Sorry but this is a TV LCD panel.

DavidAlfa · « **Reply #9 on:** August 14, 2023, 07:39:21 pm »

As far as I know TV panels don't have any eeprom...?
What whas the fault in the board with "processor failure"? And what was the problem with the other one your're taking the new panel from?
If a new board didn't fix it, perhabs there's another board? T-CON? Though I've only seen these in larger models, mostly in 50" and up.
The board does usually have an eeprom for EDID and might have another for the tv settings, but sometimes it uses the flash memory.
Maybe you need to restore a firmware backup from internet. What's the TV model?

EBW · « **Reply #10 on:** August 14, 2023, 07:55:35 pm »

Hi DavidAlfa, Please view the following Youtube video as it should explain things for you.

fzabkar · « **Reply #11 on:** August 14, 2023, 07:55:55 pm »

Quote from: EBW on August 14, 2023, 07:21:26 pm

Hi fzabkar, Sorry but this is a TV LCD panel.

If it has a HDMI input, then there may be an EDID EEPROM behind it. If that's the case, then a PC should be able to read the EDID, even if the monitor/TV is powered down.

Anyway, are you referring to an EEPROM on a T-CON board? If so, then I would think that it would contain unique calibration data.

EBW · « **Reply #12 on:** August 14, 2023, 08:05:08 pm »

Please see the Youtube video I posted previously.

fzabkar · « **Reply #13 on:** August 14, 2023, 08:16:32 pm »

Quote from: EBW on August 14, 2023, 08:05:08 pm

Please see the Youtube video I posted previously.

Yes, I see it. Sorry, our posts crossed.

What are its part markings?

EBW · « **Reply #14 on:** August 14, 2023, 08:22:30 pm »

Hi fzabkar, Sorry but I need to do further disassembly to get that info. Not able to at the moment.

fzabkar · « **Reply #15 on:** August 14, 2023, 08:25:38 pm »

Can you give us the part numbers and model numbers of the panel and the TV? Perhaps one of us can find a service manual.

You say that you don't have an EEPROM reader. If the EEPROM is an I2C type (eg 24Cxx), and if its capacity is 1Kbit or less, you could wire up a simple jig to connect it to a PC via a DB-15 VGA port. Then Windows will read the data into its registry. You would need to be aware of the Vcc, though.

EBW · « **Reply #16 on:** August 14, 2023, 08:48:49 pm »

Westinghouse Smart TV Model: WD32HBR105

LCD Panel: BOE HV320WHB-N5M

fzabkar · « **Reply #17 on:** August 14, 2023, 09:21:54 pm »

FWIW, a HV320WHB-N85 has a 32Kbit EEPROM (BL24C32A).

https://i.ytimg.com/vi/M3rVbToLFcI/maxresdefault.jpg

Just FYI, here is a 32Kbit EEPROM dump from a HV236WHB-N00 panel:

UTOK U24HD3 LED TV MAIN-TP.S506.PA63 PANEL-HV236WHB-N00 FLASH-U2-MX25L3205:

https://elektrotanya.com/utok_u24hd3_led_tv_main-tp.s506.pa63_panel-hv236whb-n00_flash-u2-mx25l3205.bin/download.html

DavidAlfa · « **Reply #18 on:** August 15, 2023, 06:11:42 am »

Bad link!

EBW · « **Reply #19 on:** August 15, 2023, 11:05:16 am »

Hi DavidAlfa, Sorry for that but others can see it?

fzabkar · « **Reply #20 on:** August 15, 2023, 11:05:33 am »

Sorry. Fixed.


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Author Topic: Swapping LCD Panel EEPROM (Read 2756 times)

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