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Principles of Operation
The instrument cluster and panel illumination consists of dimmable and non-dimmable illumination components. The dimmable illumination is controlled by the instrument panel dimmer switch, which allows the brightness level of the backlights to be adjusted to the customer preferences. With the parking lamps ON, the instrument panel dimmer switch uses electronic circuitry to provide a variable pulse width modulated (PWM) output to the instrument panel and all applicable switches depending on the driver-controlled level of intensity. The headlamp switch backlighting consists of 2 constantly illuminated LED bulbs that are powered by separate circuits. Battery voltage is supplied to the first bulb when the ignition switch is in the RUN position. Battery voltage is supplied to the second bulb with the parking lamps ON. The non-dimmable illumination allows for full intensity dependant on the ignition switch position.
Inspection and Verification
Verify the customer concern.
Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
Instrument panel dimmer switch
Instrument panel dimmer switch
If an obvious cause for an observed or reported concern is found, correct he cause (if possible) before proceeding to the next step.
If the cause is not visually evident, verify the symptom and GO to Symptom Chart .
The control illumination is inoperative
Go To Pinpoint Test A .
The instrument cluster illumination is inoperative
Go To Pinpoint Test B .
The climate control panel illumination is inoperative
Climate control panel
Go To Pinpoint Test C .
The audio unit illumination is inoperative
Go To Pinpoint Test D .
The transmission control lever illumination is inoperative
Transmission control lever illumination bulb
Go To Pinpoint Test E .
The hazard warning switch illumination is inoperative
Hazard warning switch
Go To Pinpoint Test F .
The traction control switch illumination is inoperative
Traction control switch
Go To Pinpoint Test G .
The window control switch illumination is inoperative
Window control switch
VERIFY the operation of the window control switch in question. If the window control switch is inoperative, REFER to Section 501-11 . If the window control switch operates correctly, INSTALL the new window control switch in question. REFER to Section 501-11 .
The instrument panel illumination does not dim
Go To Pinpoint Test H .
Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative
A variable pulse width modulated (PWM) voltage is supplied to the instrument cluster through circuit 29S-LA31 (OG/BU). The instrument cluster is grounded through circuit 91-GG14 (BK/OG).
circuit 29S-LA31 (OG/BU) open
circuit 91-GG14 (BK/OG) open
PINPOINT TEST B: THE INSTRUMENT CLUSTER ILLUMINATION IS INOPERATIVE
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
If it is a LCD TV, there are illuminators behind the LCD panel, either power to those or bulbs are faulty, if no picture at all it is more than likely a power supply problem, need to replace the power supply.
You need a new bulb installed - difficulty is semi hard , in that you must take apart the boombox , remove the shroud around the bulb , unsolder , resolder new one ..take the old one to an electronics shop to match.
common problem with LCD TV is a dead screen but there is a sound.
so the problem is always coming from inverter board inside the lcd,
inverter board controls the ccfl bulbs that illuminate the image in the screen.
there are 4 or more bulbs inside your screen supplied by inverter board.
you can see this inside at the back of the screen there are 4 boards inside,
display driver board,power supply board ,inverter board and input board,
this could be repaired or replace.but you need some tools for opening the case and test equipment.
add comment if you want some help..
hope i help you....
The display is back-illuminated by small incandescent bulbs. Burnt out bulbs equal no display, although the chances of several bulbs failing at once is not high so the power supply for the display/bulb assembly is a good place from which to start fault finding.
It needs a repair shop - as a user there's nothing you can simply dig into to fix.