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Mitsubishi "Blinking Green Light" Repair Procedure (Page 1 of 3)

This Article is written to provide assistance and step-by-step guidance in resolving the Mitsubishi "Blinking Green Light" issue. This failure is often referred to as the "Blinking Green Light of Death" or BLOG. A large amount of information is included in this Article, all of which will help you to both understand and repair the 'Blinking Green Light' problem.

Written specifically for the Mitsubishi 65" WS-65813, this article ALSO applies to other Mitsubishi models with the same 'blinking green light' issue.

The Mitsubishi 'Blinking Green Light' failure is common with many Mitsubishi models including the WS-65813, WS-48513, WS-48613, WS-55513, WS-55613, WS-55813, WS-65513, WS-65613, WS-65713, WS-73513, WS-73713 and others. This detailed repair procedure will assist, even the NOVICE, in the required repair process. Links are provided for downloading Mitsubishi Service Manuals and for recommended parts ordering. Circuitboard photos are also shown which provide a visual reference during the repair process.

I hope that this Article helps you to resolve your Mitsubishi "Blinking Green Light" issue.

Background

When I encountered the 'blinking green light' issue with my Mitsubishi 65" WS-65813, I called Mitsubishi's Customer Service Department. Following repeated promises to correct the issue, it soon became evident that they were both "dragging" their feet and not at all anxious to admit liability for this failure or to provide a timely repair of the television. After several phone calls to Customer Service, I sent a detailed letter to Mitsubishi Customer Service with a copy to Mitsubishi's President & CEO outlining my concerns and asking for a "good will" repair of my 65" Mitsubishi. After waiting about three weeks for Mitsubishi to assign one of their Authorized Repair Dealers to repair the unit, I repaired the television myself.

Mitsubishi Customer Service did not follow up on the issue and I never received a acknowledgement letter from Mitsubishi's President and CEO.

Repairing It Yourself

If you decide to repair the TV yourself, I recommend that you obtain a copy of the repair manual for your Mitsubishi TV from the Techlore website by going to Mitsubishi Service Manual. It will provide some direction, however it is technically written and may be difficult for the NOVICE to understand. If you are unable to locate the the service manual for your specific Model at the above Techlore link, you may need to purchase the service manual online at ServiceManuals.net.

If you decide to have a service technician do the repair, insist that the "DM" module is removed from the TV and ONLY the four 1000uF, 16V Capacitors (Caps) located on the DM Module are replaced. MOST techincians will INSIST on replacing the entire DM Module and not simply the capacitors. The cost is about $200 for a technician to replace the capacitors and $1000 for replacement of the DM Module. As you will read below, doing the repair yourself will cost less than $4.00 for the 4 Caps.

Overview

I repaired my Mitsubishi WS-65813 by replacing the four (4) DM Module 1000uF, 16V, 85C Capacitors. The basic tools and materials required were: Four (4) capacitors, soldering iron, rosin solder, wire cutters, phillips & flat-head screw drivers and pliers.

Repair estimates, from a local authorized Mitsubishi Repair Center, was between $800 - $1000 to replace the DM Module. My total out-of-pocket cost for replacing the four (4) capacitors was $3.50.

Replacement Parts:

Replace the original four (4) 1000µF, 16V, 85ºC capacitors on the DM Module with Radial Polarized, 1000µF, 35V, 105ºC Capacitors.

Description: Computer Grade Electrolytic Capacitors or High Temp Electrolytic Capacitors; Capacitance = 1000µF; Voltage = 35 V; Operating Temperature Range = - 20º C to + 105º C; Termination Style = Radial, Operating Hours = 10,000 Life Hours. The original DM capacitors are rated at 1000µF, 16V, 85ºC. Do not use capacitors with this rating to repair your Mitsubishi television, or else the same issue will reappear in 1-2 years.

The capacitors are available from several on-line electronics stores and possibly from a local television repair shop. I recommend that you use ONLY high temp Capacitors rated at 105º C, with a voltage rating of 35 V. Refer to the "General Information" section below for additional information about purchasing the capacitors from a online website.

If you decide to take on the repair project yourself, pay CLOSE attention to my "Lesson Learned" note; a copy of which is provided below. This was posted to TechLore on October 4th, 2007. See comments below.

Copied from a previous Techlore posting. Quite important:
October 4, 2007 3:30 PM

Lesson Learned: Larry, For your information and others, after replacing the 4 capacitors on the DM Module, I slid the DM circuit board back into the metal DM case and then inserted the entire unit into the main circuit board. This was working in the "blind" as it was impossible to verify a proper seat of the DM circuit board onto the mother board. The blinking green light was still present upon power-up of the TV. I again removed the DM module from the TV and this time I re-installed the DM circuit board onto the main mother board and THEN installed the DM metal case over the top of the circuit board. By doing this, I was able to ensure a proper connection of the DM board. Upon power-up the TV is UP and RUNNING.

A Few "Cautions"

  1. Keep yourself "grounded" when working with the circuit board. Static electricity will destroy electronic components.

  2. When replacing the Capacitors, press them "down" onto the circuit board as far as they will go, hold them down, solder into place and clip the excess terminal lengths flush with solder. Only by doing this will the metal shield (little silver box) slide down and over the circuit board during re-assembly. There is not a lot of clearance when doing this, as the 105C Capacitors are slightly longer that the originals. With minimal effort everything does fit back together.

  3. Use ONLY 105º C capacitors with a voltage rating of 35 V.

  4. Re-insert the DM circuit board into the Mother board; press virmly and ensure a proper seat of the DM board. Next, slide the metal case down and over the DM circuit board. Refer to my "Lesson Learned."

General Overview of Mitsubshi Power-up Cycle

Normal Power-up Sequence: During TV power-up, the green light blinks until the Digital Modulator (DM) has booted up and is in sync with the microprocessor. Once the two are in sync, the television will "turn on". A failure in this boot up process is indicated by the "blinking green light" continuing to flash and the television's failure to "turn on".

Problem: Continuous "blinking green light". Mitsubishi television will not "turn on"; no video and/or audio; no audible noise or sound from the TV. Blinking green light will extinguish ONLY by unplugging the Mitsubishi from its power source.

Basic Troubleshooting

  1. Press the "reset" button and hold for 10 seconds .... Does TV turn on and blinking green light turn to solid green.

  2. Unplug the TV from it's power source for various times, ranging between 5 minutes and 24 hours..... Does blinking green light continue upon plugging in the TV.

  3. Disconnect ALL devices from the TV; DVD, Tuner, Cable Box, unplug the TV for various duration times .... Does blinking green light continues upon plugging in the TV.

  4. Press Power and Menu buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.

  5. Press Power and Display buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.

  6. Insure that no front panel buttons are inadvertently stuck in an "engaged" position.

Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:

  1. DM Module Capacitors have FAILED.
  2. DM Module is defective.
  3. EEPROM Board failure
  4. Power Supply failure.

Perform a Mitsubishi "error code" diagnostic check to assist in determining where the problem lies. Refer to your Owner's Manual for specific procedures on running this check. You may also read Mitsubishi Television Error Code Diagnostic Procedure which is posted on Techlore's website.

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