Question about JVC RV-B55 Cassette/CD Boombox

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Bulb illuminating lcd display panel failed

Please can you assist with supply of bulbs for illumination of RV-B55 BU
boombox ?

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  • 30 Answers

Go to an electronics store. You need a 12 volt bulb that solders onto a small removable circuit board located directly behind the display.

Posted on Aug 20, 2009

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Posted on Jan 02, 2017

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What is the fuse number for the dashboard lights on a 2007 Ford Focus 3 door hatchback?


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
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Instrument panel dimmer switch
  • Circuitry
  • Connector(s)
  • Headlamp switch
  • Instrument panel dimmer switch
  • Illumination source(s)

  1. If an obvious cause for an observed or reported concern is found, correct he cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, verify the symptom and GO to Symptom Chart .

Symptom Chart
Symptom Chart Condition Possible Sources Action
  • The control illumination is inoperative
  • Headlamp switch
  • Circuitry
  • Go To Pinpoint Test A .
  • The instrument cluster illumination is inoperative
  • Circuitry
  • Instrument cluster
  • Go To Pinpoint Test B .
  • The climate control panel illumination is inoperative
  • Circuitry
  • Climate control panel
  • Go To Pinpoint Test C .
  • The audio unit illumination is inoperative
  • Circuitry
  • Audio unit
  • Go To Pinpoint Test D .
  • The transmission control lever illumination is inoperative
  • Circuitry
  • Transmission control lever illumination bulb
  • Go To Pinpoint Test E .
  • The hazard warning switch illumination is inoperative
  • Circuitry
  • Hazard warning switch
  • Go To Pinpoint Test F .
  • The traction control switch illumination is inoperative
  • Circuitry
  • Traction control switch
  • Go To Pinpoint Test G .
  • The window control switch illumination is inoperative
  • Circuitry
  • 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
  • Headlamp switch
  • Circuitry
  • Go To Pinpoint Test H .

Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative
Normal Operation 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).
    Possible Causes
  • circuit 29S-LA31 (OG/BU) open
  • circuit 91-GG14 (BK/OG) open
  • instrument cluster
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.

Sep 24, 2017 | Ford Cars & Trucks

1 Answer

The digital display does not work i think the bulb has gone do you know how i can fix it easily?


"digital display's" do not use one bulb for illumination, usually a 7 segment LCD display is used. The entire display will have to be replaced, IF the display is at fault.

Jun 17, 2015 | Ovens

1 Answer

What can be wrong with my 50" Samsung Flat screen, no picture, only sound?


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.

Jul 24, 2014 | Samsung Televison & Video

1 Answer

JVC RV-DP100BK orange backlit illuminate LCD display stop working?


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.

Apr 08, 2013 | JVC RV-DP100 Cassette/CD Boombox

1 Answer

How many watt (power) is this?


  • 24 Watts Total Power
  • Active Clear Sound (ACS) to improve clarity for better balance with deep lows
  • AUX Input
  • 3 Preset Equalization Settings
  • Digital Tuner with Auto Preset
  • 15 AM and 30 FM Station Memory
  • Twist Lock CD and Cassette Doors
  • 1-bit D/A Converter
  • Continuous, Repeat, and Random Play
  • Programmable up to 20 tracks
  • Auto-Reverse Cassette Transport
  • Full-Logic Tape Control
  • CD Synchro-Start Recording
  • 2- 4" Full-Range Speakers
  • 4-Layer Voice Coil: shifts down the lowest resonance frequency and increases driving power
  • Long Labyrinth Ducts: extend the frequency response down to the lowest frequencies
  • Speaker Illumination: the illuminated center cap blinks with the rhythm of the music
  • Carrying Strap with Remote Control Holder
  • COMPU PLAY
  • Clock/Timer with Sleep and Wake-up
  • Back-lit Illuminated LCD Display
  • Full Function Remote Control
  • 1 Year Parts and Labor Warranty
  • Weight: 13.5 lbs.
  • Width: 21 3/8"
  • Height: 8 9/16"
  • Depth: 10 1/4"
  • Oct 23, 2012 | JVC RV-B550 Cassette/CD Boombox

    1 Answer

    Black screen, only sound


    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.... thanks.....

    Aug 31, 2011 | AOMNI Corporation Magnavox 20MF500T/17 20...

    1 Answer

    I have a DX-LCD32-09 LCD TV that is less than 2 years old. When you turn the TV on the sound is great but no pic. It is black. What could be the problem


    More than likely it uses florescent bulbs for illumination. I first would try replacing the power supply for the bulbs

    Nov 02, 2010 | Dynex DX-LCD32-09 LCD TV

    1 Answer

    Display light off


    Yes it can, you`ll need a soldering iron, solder and a small 12 volt bulb , it is directly behind the display on a removable circuit board. You`ll need to bend the tabs straight and wiggle it off.

    Nov 19, 2008 | JVC KABOOM RV-NB10 Boombox

    1 Answer

    I have a jvc RX-550V receiver and when i plug it in the standby red light turns on but the display does not


    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.

    Aug 10, 2008 | JVC Audio Players & Recorders

    1 Answer

    Display light


    This is the backlight, bulb 9V. must be repaced, i suggest to replace by a 12V. bulb
    Unit has to be disassembly. Good luck

    Mar 03, 2008 | JVC RV-B55 Cassette/CD Boombox

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