LCD 2DIN CAR radio screen problem

[domix]

I have this china no name car radio, touch screen 7''.

I have no picture on it, only buttons have light, screen are black. I open it and i meassured caps so 2 of them have strange values, migth this is the problem?

100uF-97uF
47uF-43,7uF
22uF-20,9uF
22uF-21,7uF
100uF-118,3uF
22uF-118,5uF
22uF-22,3uF
1uF-1,1uF
4,7uF-20,1uF

[budm]

Re: LCD 2DIN CAR radio screen problem

Did you remove the caps and test them off the board? It sounds like you do not have backlights for the screen. Need good clear pictures of the screen assembly so we can see the wires of the LCD panel. From you pictures I cannot tell if it uses high voltage for the CCFL backlights or LED backlights type.

[stj]

Re: LCD 2DIN CAR radio screen problem

it's led - i had one.
and it's a nightmare to strip because they put glue over all the ribbon-connectors!

[lti]

Re: LCD 2DIN CAR radio screen problem

The capacitance measurements are fine. C4 and C14 are in parallel, so you should see around 122uF. Also, C16, C17, C20, and C24 appear to be in parallel. You're measuring the combined capacitance of all those caps.

[domix]

Re: LCD 2DIN CAR radio screen problem

So, how to fix it? Is it lcd inverter? can i connect this lcd from car to inverter on pc lcd or laptop lcd inverter, to se if i have backlight? or it will burn lcd?

[stj]

Re: LCD 2DIN CAR radio screen problem

it will destroy the dislpay panel if you connect it to an invertor.

[domix]

Re: LCD 2DIN CAR radio screen problem

Then it is best to throw it away, and buy new one ? i can connet it to the external display, but only when i turn radio on screen blinks and than is black image on ext, diplay.

[stj]

Re: LCD 2DIN CAR radio screen problem

does the touchscreen work?
i mean - is it *just* a backlight problem?

[domix]

Re: LCD 2DIN CAR radio screen problem

i dont' know for touch, it it not my radio so i dont know where to press it to something work :P

[stj]

Re: LCD 2DIN CAR radio screen problem

o.k. press the eject button to make the front open and put a music cd in it.
if it takes it in and plays it we can assume it's working.

[tibimakai]

Re: LCD 2DIN CAR radio screen problem

I don't know how is this receiver, but since the display is moving, it may be a broken ribbon cable also.
This is why, I don't like the 7" screen receivers or the flip out ones.
Did you try using a flashlight on the screen, while playing a DVD, to see if there is an image on the screen?

[domix]

Re: LCD 2DIN CAR radio screen problem

with flashlight i don't see nothing on the screen, even if i put the cd in, nothing happens, only cd start to spin and that all, if i press any buttons on the screen or on remothe is only beep sound, if i pres eject or up and down than display moves down

[tibimakai]

Re: LCD 2DIN CAR radio screen problem

Check the ribbon cable for damages, between the LCD and the main unit.
I'm not familiar with this receiver, some pictures may help.

[stj]

Re: LCD 2DIN CAR radio screen problem

i think the main system is not running or as said - a bad connection.

[domix]

Re: LCD 2DIN CAR radio screen problem

it is this one
http://www.chinavasion.com/china/who...WIFI_GPS_DVB-T

i will open the main unit when i come home, and than will see. i even dnot know what to press because, i got it that dont' work.

[tibimakai]

Re: LCD 2DIN CAR radio screen problem

If he can play a DVD and buttons beep, in my opinion the system it's working.
Did you measure the voltage going to the LEDs?

[domix]

Re: LCD 2DIN CAR radio screen problem

how can i measure that? dvd wont play, or maybe it is, but i don't know what to pres, autoplay don't work

[domix]

Re: LCD 2DIN CAR radio screen problem

now i opend main unit, is there something i must to check

[domix]

Re: LCD 2DIN CAR radio screen problem

any solutions?

[tibimakai]

Re: LCD 2DIN CAR radio screen problem

I'm not here only occasionally.
In the last picture there is a red and black wire with a little white connector on top of the board, that supplies the backlight power to the LEDs.
See, if you are getting any voltage there. If they are LEDs, it shouldn't be high voltage there.
If they are CCFL tubes, you most likely shouldn't measure that connector.
I'm not familiar with these units, I have opened up only Kenwoods.