Question about Panasonic SC-PM31 Shelf System

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PM313: Display is very dim

PM313: Display is very dim, and dimmer yet in the dim mode. Why?

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If it is like my SC-PM31 the screen will soon go totaly blank. I have asked for help to fix.

Posted on Oct 22, 2011

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Posted on Jan 02, 2017

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2005 cavalier dash lights not working. all fuses are goood. replaced cluster, dimmer switch, multifunction switch


Back lighting or warning lights ? check engine , ABS , air bags , seat belt , oil light etc... ?
Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
• Power window switches
• HVAC control head assembly
• Radio
• The instrument panel cluster (IPC)
When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) display (radio) turns on at maximum brightness. When the park lamps are ON all incandescent back lighting turn ON at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the instrument panel dimmer switch through the instrument panel dimming lamps control circuit. The setting of the instrument panel dimmer switch determines the amount of voltage that the instrument panel dimmer switch supplies to the BCM through the instrument panel dimming lamps low reference circuit. The BCM then sends a pulse width modulated (PWM) voltage to all the interior lamps. All the vacuum florescent (VF) and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the PARK or HEADLAMP position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.

I would have it checked for DTC'S - diagnostic trouble codes stored in the BCM !
DTC B2624 Display Dimming Input Range/Performance
The body control module (BCM) supplies voltage to the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit. The dimmer switch varies the voltage and returns the new voltage to the BCM through the dimmer switch signal return circuit. The BCM uses this voltage to determine the illumination level of the instrument panel lamps.

DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit Range/Performance
The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the I/P lamps. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.

DTC B2662 Park Lamp Switch Circuit Malfunction
The park lamps are controlled by the turn/headlamp switch. Positive battery voltage is supplied to the switch through the EXT LP fuse. When the turn/headlamp switch is placed in the park or head position, battery voltage is supplied to the park lamps. The body control module (BCM) is also connected to the park lamp circuit to sense whether or not the park lamps turn ON when the low beam or high beam headlamps are turned ON. The BCM also uses the parklamp battery positive voltage to power the instrument panel (I/P) dimmer output circuit. If the BCM senses that the low beam or high beam headlamps are ON and the park lamp input is not active, DTC B2662 sets.
Do the park lamps work ?

Jun 11, 2017 | Cars & Trucks

1 Answer

Which fuse is for the instrument panel back lighting?


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.

Dose

Jul 14, 2015 | 2008 GMC Sierra 1500

2 Answers

Why doesn't the display change when I press the dimmer button


Dimmer may have been damaged from a power surge or excessive electrical power source. Could be expensive to repair, and be prepared if you need to have it serviced.

May 10, 2014 | Audio Players & Recorders

1 Answer

Buick Rendezvous Head Up Display


not sure about that one but there is a dimmer wheel by the light switch. move it up and down to dim and brighten the dask lights/cluster. wheel may need replacing. also work the lights on and off switch manually to see if there every thing works smooth or hopes from dim to brite.

Feb 16, 2014 | Cars & Trucks

2 Answers

HP Envy display stays dimmed after waking from sleep mode


Hi, i made several searches on google for you problem but did't get a right answer except this link. They provide support for HP Envy Laptop. Why not you try to call them on mentioned toll-free number.

http://www.hptechsupportnumbers.com/hp-envy-laptop/

Jul 20, 2017 | HP Computers & Internet

1 Answer

2 n2000 dimmers controlling lights in funeral chapel are in dimming mode horizontal lines appear on video screen increasing in intensity as more dimming is applied. two circuits supply lights with a shared...


I am having the same trouble in my church with two nsi/leviton dimmers. Wide horizontal bar created on video screen during dimming. No bar at 100% or off, just anywhere in between.

Nov 20, 2010 | Leviton Electrical Supplies

1 Answer

Sony CDX-S2210 CD Player stuck on demo mode , cant adjust volume eq, skip track or anything


make sure the unit is switched off and the clock is displayed then

1 Press and hold (SEL).
The setup display appears.
2 Press (SEL) repeatedly until the
desired item appears.
3 Press the volume +/– button to select
the setting (example “ON” or “OFF”).
4 Press and hold
(SEL).
The setup is complete and the display returns
to normal play/reception mode.
Note
Displayed items will differ, depending on the source
and setting.
With the card remote commander
In step 3, to select the setting, press
< or ,.
The following items can be set (follow the page
reference for details):
“z” indicates the default settings.
*1 When the unit is turned off.
*2 When the audio output is set to “SUB.”
CLOCK-ADJ
(Clock Adjust)
(page 4)
BEEP To set “BEEP-ON” (z) or
“BEEP-OFF.”
SUB/REAR*1 To switch the audio output.
– “SUB” (z): to output to a
subwoofer.
– “REAR”: to output to a
power amplifier.
DIM (Dimmer) To change the brightness of the
display.
– “DIM-ON”: to dim the
display.
– “DIM-OFF” (z): to
deactivate the dimmer.
DEMO*1
(Demonstration)
To set “DEMO-ON” (z) or
“DEMO-OFF” (page 4).
A.SCRL
(Auto Scroll)
To scroll long displayed items
automatically when the group/
track is changed.
– “A.SCRL-ON”: to scroll.
– “A.SCRL-OFF” (z): to not
scroll.
LPF*2 (Low
Pass Filter)
To select the cut-off frequency
“78HZ,” “125HZ” or “OFF

Jan 28, 2010 | Sony CDX-S2210 CD Player

2 Answers

Dim Screen on the 2001 Toyota Prius


Yes the screen dims automatically when the lights are on to suit night driving. I am not specifically familiar with the 01 model, however on my 08 model, the display brightness is also manually adjustable via a button located below and to the right of the display. The button is marked with a series of short lines assembled in an arc. Hope this helps.

Nov 25, 2009 | 2001 Toyota Prius

1 Answer

The display is too bright at night. anyway to dim


Sorry this one was not built with any dimmer opportunities.

Sep 28, 2009 | Starlite Next Play Clock Radio with iPod...

2 Answers

Dim Display


On newer stereos, you might have to experiment with the "panel" wire.

I just installed a VR3, and discovered that the more voltage on the "panel" wire, the dimmer the display.

With no connection, you get full (daytime) brightness. With full voltage, you blank the display.

I wired mine up to the car's instrument lights through a 10Kohm trim resistor so I could adjust the "night" intensity. But if I dim the car's instrument lights, the stereo gets brighter. Oops.

Older car -- I can't just flip a software bit. ;)

But I gather a lot of new stereos are like this. The display on my (factory) stereo in the Mitsu dims a fixed amount when the lights come on, but doesn't adjust with the car's instrument dimmer.

Sep 23, 2007 | Car Audio & Video

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