1993 Mitsubishi 35" Tube - no color on any input > only on menu
Our 1993 35" Mits tube worked very well for several years then was stored for about 5 years; after storage the picture was very good and it worked for several more years. Eventually it developed a daughter board - circuit board solder connection failure on surface mounted caps. The tech that came out was moonlighting (oh how I wish I could find another moonlighter now) and told us the colors were starting to run a little but for the age it was a nice picture. To us, since we use this in the den about 6 hours a week, the picture was still great.
About a year later or 5 years ago (yes we've been watching things in black / white for several years - it helps keep the wife & kids busy elsewhere) we lost the color on the set on all inputs including Coax, S-Video and RCA. The colors show up when in the menu mode and seem to be there in terms of capablity because when the tint / colors are adjusted you can see red/green/blue outlines or color noise in the background of the images.
We're looking for a tech who can fix this set and another one (afterhours for cash - in the Lansing, Michigan area) or someone nice enough to help locate the area of the TV I can look for circuit board solder issues and/or failed components. I have a few years electronic / TV repair experience from my college era, granted it was several years ago, I'm still good with a solder iron and fluke meter. Please help me determine know where to look and what to look for! Would this be failed cap(s) or an IC chip issue or diodes or solder connections? Does the set need any mods?
And I want to thank you for your contribution to corporate decline, over inflated everything. Welcome to the era of DIY - not because we want to, because we have to in order to survive!
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Re: 1993 Mitsubishi 35" Tube - no color on any input >...
Good Day, lhcsmi;
That year model of your TV it will be the PIP MODULE; PULL PIP PCB FROM SET, JUMP OUT 'VP' CONNECTOR WITH 1UF CAP FROM PIN 7 TO PIN 9 AND 1UF CAP FROM PIN 11 TO PIN 5.CHECK ALL ELECTROLYTIC CAPS AND TRACES CONNECTING TO THESE CAPS FOR CONTINUITY.
The board is about 3x5, it's in the towards the back of TV's chassis in the middle of chassis. The caps are best to install on the bottom of the main "mother board", the board is numbered. Do not re-install board. You will correct problem but will loose the PIP function.
I can't help with side tech from here in TX, but there is many good tech's in the Capitol, of MI, moved 25 yrs ago from that area.
I hope this was helpful.
Good Luck, big IRISH.
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after 4 or 5 yrs ( depending on usage ) in some TVs on mainboard & crt tube's circuit board at few soldering joints cracks develops ...... then due to loose connection TV behaves as you said ..... so solution is most of the soldering joints on mainboard & crt tube's circuit board should be resoldered carefully ....that'all your TV will again works normally ......100% GUARANTEE
Code 5 is "AKB error". AKB, or auto kine bias, is a cicuit that monitors the three color guns of the picture tube (red, green and blue) and tries to adjust them for proper color balance. If it can't, the picture is blanked (usually) and the timer/standby light blinks 5 times. When the color drives aren't balanced, you see a color tint in the picture like you're describing.
There might be a problem in the AKB circuit, or the picture tube may just be old enough that the AKB circuit has run out of adjustment range. If the tube is at fault, you should consider replacing the set. A new tube will cost nearly as much as a new 32-inch LCD TV, and you'll need to pay someone to install it and set it up. There are special tools required to perform the convergence which gets the color guns aligned with the face of the tube so they hit the right colors.
If you'd like to try tinkering with the service menu adjustments, this site explains how to access the menu and gives a list of settings.
There are several possibilities in that area. The Picture Tube (CRT) is driven by three different video signals. One presents the Red, one the Blue and one Green. All other colors are derived from a mixture of those three colors. The greenish tint could be a sign that the green gun is being over driven or the Red and the Blue are less than adequate to create a normal picture. Sorry to say this but the most common problem that causes that symptom is the emission in the "gun" assembly inside the picture tube is declining with age and hours of operation. Sony Picture tubes are typically good for around 40,000 hours of use. I don't recommend replacing the picture tube. If the set is more than 5 years old I would suggest that you start looking for a new set.
I know this is bad news but I am just telling what I know the most likely scenario that I have seen in 35 years of TV service.
the vertical drive ic that drives the yoke for vertical sweep has blown.
sometimes it is solder problems like sharp and toshiba had.
the part is 10$ the pc board will label it ,the yoke is the coil setup on the picture tube.if you follow the wiring half goes to the horizontal drive,and the others to the vertical section.the chip drives the coil directly.there are VERY high voltages in there ,even turned off. the pix tube cap on top is 30000v. like a stun gun.the horizontal drive 2000 volts and the main power supply 165 volts dc high current.you need a special setup to discharge the picture tube.
tv producess three colours red, blue and green, each of this has a different input on the tube (crt)
each has a seperate path from the IC to the tube neck.
on the tube are three transistors, each one for one colour,these transistor can be tested individualy,
if all this does not work, then take your tv for rejuvanation (opening of gates on the tube in puts)
1. CHECK C218 4.7 UFD 50 V, AND C220 47 UFD 35V ON THE SIGNAL PCB. 2. CAN BE OBSERVED AS DISTORTION ON DC PEDESTAL PORTION OF STAIR STEP PATTERN. SUSPECT C222 OPEN. LOCATED ON PCB-SIGNAL AT IC200 PIN 35. (10UF 35V) 3. SHOWS UP ON COLOR SIGNALS ONLY. OK ON B/W PICTURES. CHECK X600 AT IC200 PIN 13. SHOULD BE 3.58MHZ. LOCATED ON PCB-SIGNAL. PT# 285P02905 4. (COLOR LINES) CHECK C601 47 UFD @ 35V ON THE COLOR CONTROL OFF PIN 36 OF IC200 ON THE SIGNAL PCB. 5. SUSPECT C222 OPEN. LOCATED ON PCB-SIGNAL AT IC200 PIN 35. (10UF 35V) .
REMOVING CRT SOCKET, YOU MAY HAVE CORROSION ON THE PINS OR POOR CONNECTION ON CRT BOARD, AND BY REMOVING IT COULD HAVE CLEANED THE PINS A LITTLE. TRY CLEANING PINS ON CRT AND SOCKET.
GOOD LUCK, big IRISH.
Try a hard restart, which simply means unplugging the power cord of the TV, and replugging it after 4 hours have passed. If this does not bring the picture back, then you should consider buying a new TV. The costs of a repair ( labor and parts) might exceed the cost of a new TV. Your 10 year old TV has served you well, and has exceeded the average life expectancy of 5 years. May it rest in peace in TV heaven.
this model is famous for fluid leaks. each projector
tube has a reservoir on the front of it with a fluid in it. this keeps the face of the tube cool.
this depends on how bad the damage is in the tv. in most cases we can reseal the tube and clean up the fluid 400-600.
take the tube out you will see where it leaked. The problem is that the
frame on the CRT that the heavy screws with springs are mounted on (that
hold the lens coupled to the CRT) is weak and they can bend. We have seen
several that have leaked after the customer moved the set. You can only
tighten them down so much because the frame bends. It is just stamped metal
and not welded at the corners to support the bend.
We remove the CRT, clean it all up, add a very small amount of RTV sealer to
the gasket, reassemble, let the RTV cure thoroughly and refill with coolant.
The extra sealer should prevent future leaks. Haven't had a recall yet.
Mits says replace the CRT...too costly.
You msut check the yokes carefully as well. If any coolant gets into them
you can end up with shorts there and a mess.
other wise this is common problem too. Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html http://www.hdtvoice.com/voice/showthread.php?t=28929 Or send to ptscorp.com http://www.hdtvoice.com/voice/index.php?s=