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Re: No back light on display
I know that most Clarions have an "illumination" wire usually orange and or orange/white. If the unit only has one, then most likely it is for a "dimmer circuit" and not atraight illumination. Let me know. If by putting power on tat orange wire does not do it, then you have a bad "bulb" in the faceplate.
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Does the radio play ? Are any other back lighting components not lighting ? Does the HVAC control panel light up ? You probably need new radio !
The second interior lighting group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination, LED illumination and incandescent lamps.
When the ignition switch is turned to the RUN position, the radio VF display turns ON at maximum brightness. When the park lamps are ON, all incandescent and LED back lighting turn ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. At the same time all VF displays dim to match the indicated dimming level. The panel dimmer switch potentiometer is an input to the body control module (BCM). When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all VF displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.
any thing can be fixed.! (my job that, before retired)
the question (only) is time and money?
if the labor is more than a new upgraded radio.
why fix old.?
is the dash dimmer working, and all other lights on dash bright
the the radio has issues. (stock) if not stock the wires are bad behind radio. the dial wire.
does the radio work? and dial right, can you see the stations, with a flash light, ? then the back light is burned out.
if VFD display or LCD dead , big time $$$ fix.
on mine , 04 i put a new , media only head end.
am/fm , USB , flashcard, aux in, radio
and have micro usb there, very tiny with 4000 songs.
no more discs and radio head is very tiny.
I believe the problem is either a faulty light sensor the unit has to dim the display when the lights dim since it was designed for bedroom use with alrms and snooze button. or it is simply a failure in the circuit that drives the LCDs. Mine has been dim for a long time but I can still see just enough to adjust the sound settings. I tune and set stations by sound. so the display has not been an issue since we do not use it for a clock or alarm. I doubt there is a fix for the dim display.
what lights, the dial back lights, is it stock>?
the radios have 3 power sources
1 for radio and amp.
2: dial lamps (dim,) if the other cars dim-able park lamps work then
the radio lamps are bad, or not connected (1 wire)
3: memory. power.
my guess is the rad back lamps are dead.
so turn on the parking lights (Head ligths 1st click)
does dashlight up.? no, turn the dimmmer up.
do they light now? yes, and radio no?
if no radio lamp now, the lamp is bad or wired wrong or the fuse blew
that the dial feed wires to.
if not stock, any thing is possible, (infinity)
Remove covers taking care of the speaker wire. Remove screw for the green wire on disp. board and then the two screws holding the display board in place. Carefully remove the metal shield can with the four locking tabs. there are four grain of wheat lamps, two on each side of the display 12v/60mA DC. lamp # 7219 and radio shack sell them They are located in the white rubber holders on each side of the dissplay. unsolder the wires, pull up rubber white holder, remove bulbs, remove rubber light covers and put these on new lamps, slide lamp wires into rubber holders and then holders back to display pcb. Solder wires into place and repeat on other side of display. Usual common sence applies, be carefull, ect...,.
black = ground dark green = lights on input grey = panel lights pink = on input yellow = power input orange = battery power input
nca = shield ground tan = left fr spkr + orange/black = left & right spkr -neg lite green = right fr spkr +
nca = shield ground dark blue = right rear spkr + dark green/yellow = right & left spkr - neg brown = left rear spkr +
purple/white = display dim output pink = vehicle speed input ----------------------------------------------------------------------- **** 91 park ave without delco bose =
purple/white = display dim output pink = vehicle speed input
grey = left front - neg tan = left front + pos dark green = right front - neg light green = right front + pos
black = ground dark green = display dim signal grey = panel lights pink = power antanna yellow = ign input orange = battery power light blue = right rear - neg dark blue = right rear + pos yellow = left rear - neg brown = left rear + pos .
The empty slot is for a mini-PC card, usually a wireless network card. The 2 wires are actually the antenna wires that connect to the wireless card. The dim LCD may be a problem with the LCD panel display, video controller or motherboard. Try connecting the laptop to an external monitor by connecting to the VideoConnector located on the back of the laptop. If the display on the external monitor appears to be normal, then your LCD display panel on the laptop has a problem. If the display on the external monitor is dim then you probably have a bad video controller card or motherboard. Your responses are intended to improve the level of service provided. Please rate your experience. Thank You.
IF there is no display even with a flashlight, the P/S board is malfunctioning. Bad capacitors or LCD driver board circuit. Mine did this and it was bad caps, 4 of 8 were bad and a burned out chip on the P/S board.