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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) (Moderators: DF8OE, DL1PQ)  |  Topic: issue with parallel mode LCD HY28B MCHF v0.4. <- zurück vorwärts ->
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   Author  Topic: issue with parallel mode LCD HY28B MCHF v0.4.  (Read 842 times)
vu2iia
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issue with parallel mode LCD HY28B MCHF v0.4.
« on: 30. April 2021, 07:05:27 »

Dear All,

I am looking for some help, I have finished Rx side of MCHF v0.4 and Rx is working very well.
LCD (HY28B) is in parallel mode and having strange colour issue. LCD background colour changes to brown. Please have a look at the photo and suggest a solution.

Interestingly, If I use LCD in SPI mode, there is no colour issue, but SPI mode doesnt work everytime. If I try 100 times LCD SPI mode works only 2 times and 98 times I get white screen.  How do I solve this issue?.

I do have raspberry pi 3.5inch ILI9486 SPI LCD, but I need wiring details for it. I read that it works very slow in spi mode, but I am intested only testing it.  Due to covid19 lock down we cannot get things from out side India.

Color issue            =  https://qsl.net/vu2iia/mchf_v0.4_hy28b_parallel_color_issue.jpg
CPU & FW details  =  https://qsl.net/vu2iia/mchf_v0.4_hy28b_parallel_color_issue_2.jpg
Sys  details            =  https://qsl.net/vu2iia/mchf_v0.4_hy28b_parallel_color_issue_3.jpg

Hoping to get some help,

Thanks in advance

Mahesh-vu2iia
Mumbai-India
 rpi_lcd.png
« Last Edit: 30. April 2021, 07:13:48 by vu2iia »
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DF8OE
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Re:issue with parallel mode LCD HY28B MCHF v0.4.
« Reply #1 on: 30. April 2021, 07:29:27 »

Hi Mahesh,

I attach our adaptor-PCB where you can extract the neccessary informations.

vy 73 - stay healthy
Andreas
 LCD_adaptor.pdf
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