Settings for a specific HDMI TV

[muuh]

I'm trying to get the best hdmi output for with a finlux model 26fl745 tv and raspberry pi 3. in the tv manual I read that it works with 720p and 1080i. the display specification shows that it's running on 50Hz refresh rate. I tried following (pairs of) options in config.txt which all didn't work:
hdmi_group=1
hdmi_mode=19
(or)
hdmi_mode=20
(or)
hdmi_mode=39

otherwise with

hdmi_safe=1

it works fine.

Anyone has an idea what settings to try before I have to try all options?
Think I have to try 60Hz options too ...

[muuh]

some additional info:
---
"tvservice -n":
device_name=OEM-26___TFT-TV
---
"tvservice -m CEA":
Group CEA has 12 modes:
mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive
mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive
mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive
mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
(native) mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced
mode 6: 720x480 @ 60Hz 4:3, clock:27MHz x2 interlaced
mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive
mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive
mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive
mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced
mode 21: 720x576 @ 50Hz 4:3, clock:27MHz x2 interlaced
(prefer) mode 22: 720x576 @ 50Hz 16:9, clock:27MHz x2 interlaced
---
"tvservice -m DMT":
Group DMT has 1 modes:
mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
---
"tvservice -d edid_file && edidparser edid_file":
Enabling fuzzy format match...
Parsing edid_file...
HDMI:EDID version 1.3, 1 extensions, screen size 16x9 cm
HDMI:EDID features - videodef 0x80 !standby !suspend !active off; colour encoding:RGB444|YCbCr422; sRGB is not default colourspace; preferred format is native; does not support GTF
HDMI:EDID found monitor name descriptor tag 0xfc
HDMI:EDID monitor name is 26___TFT-TV
HDMI:EDID found monitor range descriptor tag 0xfd
HDMI:EDID monitor range offsets: V min=0, V max=0, H min=0, H max=0
HDMI:EDID monitor range: vertical is 49-61 Hz, horizontal is 15-46 kHz, max pixel clock is 80 MHz
HDMI:EDID monitor range does not support GTF
HDMI:EDID found preferred CEA detail timing format: 1920x1080i @ 60 Hz (5)
HDMI:EDID found CEA detail timing format: 1280x720p @ 60 Hz (4)
HDMI:EDID established timing I/II bytes are 20 00 00
HDMI:EDID found DMT format: code 4, 640x480p @ 60 Hz in established timing I/II
HDMI:EDID standard timings block x 8: 0x0101 0101 0101 0101 0101 0101 0101 0101
HDMI:EDID parsing v3 CEA extension 0
HDMI:EDID monitor support - underscan IT formats:no, basic audio:yes, yuv444:yes, yuv422:yes, #native DTD:1
HDMI:EDID found CEA detail timing format: 720x480p @ 60 Hz (2)
HDMI:EDID found CEA detail timing format: 1440x480i @ 60 Hz (6)
HDMI:EDID found CEA detail timing format: 1920x1080i @ 50 Hz (20)
HDMI:EDID found CEA detail timing format: 1280x720p @ 50 Hz (19)
HDMI:EDID found CEA detail timing format: 720x576p @ 50 Hz (17)
HDMI:EDID found CEA format: code 1, 640x480p @ 60Hz
HDMI:EDID found CEA format: code 2, 720x480p @ 60Hz
HDMI:EDID found CEA format: code 4, 1280x720p @ 60Hz
HDMI:EDID found CEA format: code 5, 1920x1080i @ 60Hz (native)
HDMI:EDID found CEA format: code 6, 1440x480i @ 60Hz
HDMI:EDID found CEA format: code 17, 720x576p @ 50Hz
HDMI:EDID found CEA format: code 19, 1280x720p @ 50Hz
HDMI:EDID found CEA format: code 20, 1920x1080i @ 50Hz
HDMI:EDID found CEA format: code 21, 1440x576i @ 50Hz
HDMI:EDID found audio format 2 channels PCM, sample rate: 32|44|48 kHz, sample size: 16 bits
HDMI:EDID found HDMI VSDB length 5
HDMI:EDID HDMI VSDB has physical address 1.0.0.0
HDMI:EDID HDMI VSDB has no extension fields
HDMI:EDID adding mandatory support for CEA (3) 720x480p @ 60Hz
HDMI:EDID adding mandatory support for CEA (18) 720x576p @ 50Hz
HDMI:EDID filtering formats with pixel clock > 162 MHz or h. blanking > 1023
HDMI:EDID best score mode initialised to CEA (1) 640x480p @ 60 Hz with pixel clock 25 MHz (score 0)
HDMI:EDID best score mode is now CEA (1) 640x480p @ 60 Hz with pixel clock 25 MHz (score 61864)
HDMI:EDID best score mode is now CEA (2) 720x480p @ 60 Hz with pixel clock 27 MHz (score 4066472)
HDMI:EDID CEA mode (3) 720x480p @ 60 Hz with pixel clock 27 MHz has a score of 66472
HDMI:EDID best score mode is now CEA (4) 1280x720p @ 60 Hz with pixel clock 74 MHz (score 4635592)
HDMI:EDID DMT mode (4) 640x480p @ 60 Hz with pixel clock 25 MHz has a score of 18432
HDMI:EDID best score mode is now CEA (5) 1920x1080i @ 60 Hz with pixel clock 74 MHz (score 5398248)
HDMI:EDID CEA mode (6) 1440x480i @ 60 Hz with pixel clock 27 MHz has a score of 3566472
HDMI:EDID CEA mode (17) 720x576p @ 50 Hz with pixel clock 27 MHz has a score of 2066472
HDMI:EDID CEA mode (18) 720x576p @ 50 Hz with pixel clock 27 MHz has a score of 66472
HDMI:EDID CEA mode (19) 1280x720p @ 50 Hz with pixel clock 74 MHz has a score of 2617160
HDMI:EDID CEA mode (20) 1920x1080i @ 50 Hz with pixel clock 74 MHz has a score of 3232360
HDMI:EDID CEA mode (21) 1440x576i @ 50 Hz with pixel clock 27 MHz has a score of 45736
HDMI:EDID preferred mode remained as CEA (5) 1920x1080i @ 60 Hz with pixel clock 74 MHz
HDMI:EDID has HDMI support and audio support
edid_parser exited with code 0
---

[muuh]

I tested by hand some values for "hdmi_mode"', where following did work:
1 2 3 6 7 8 15(w/ "white pixel noise") 17 18 21 22 25(same)

so the best I could get now is mode 22 (576i) where the tv should do 720p or 1080i. A Wiiu running on HDMI port proposed 720p, manually 1080i did also work. Looks like this TV sends out some bad edid informations... Anyone has some clues how to get 1080i or 720p on this raspberry pi 3?

[muuh]

tv manual in french and german:
https://migros-service.migros.ch/medias ... 008357.pdf