Question about Mitsubishi WT-46809 46" Rear Projection Television

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Unpluged the crt circuit boards. was getting 2-2 code and burning fuses

Thanks...so now unit stays on with the crts unplugged...without blowing the fuses. Is there something i can do

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  • Mitsubishi Master
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Okay. now what you have to do is plug one crt back in and try it if the fuse doesnt blow then plug in the second CRT and try it again. then if it still doesnt blow with the two CRts plugged in then plug in the last crt if it blows thats the bad crt, and it will need to be replaced. But when you plug in the bad CRT the fuse will blow. Then let me know which tube as I have a good source for mitsubishi CRTs at real cheap prices.

Posted on Jun 24, 2008

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Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

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1 Answer

How I fix the window unit airconditioner blow the fuse in circuit board


you have a short unplug each section one at a time from the board fan then compressor and try it each time to see which one does not blow the fuse you may lose a few fuses but you will find out where your problem is

Sep 02, 2014 | Heating & Cooling

1 Answer

My 02' mdx won't come out of park, keep blowing a 20 amp fuse. This fuse controls the Cruise, break lights, memory seat, horn and linkage. I have to manually delink. I have unhooked the comand...


Here is an idea, when do you blow the fuse key on, key on engine running, key on engine running hitting the break pedal? Try and get the key on without blowing fuse if possible, then one at a time try those circuit loads ie: horn, brake pedal and so on, if you isolate which load is pulling to many amps(blowing fuse) unplug that load itself, then restart testing, see if fuse stays ok. You can also substitue the fuse with a circuit breaker and unplug each load until click(of breaker) stops.

May 17, 2011 | 2003 Acura MDX

1 Answer

The television just starts changing channels and the volume goes all the way up. We have no idea how to fix it...can you help?


More than likely your tact switches are sticking in the little circuit board on the front of your unit. If you unplug this circuit board and the problem is resolved then you know it was the culprit. The unit should still work via remote while you have the board rebuilt. It unplugs from behide the screen near the back of the crts on most models. If problem persist with brd disconnected then its probably the eprom.

Aug 21, 2010 | RCA P55000 55" Rear Projection Television

1 Answer

It looks like I can't get power to the tv?


You probably have a bad Power Supply. There are usually 1 or 2 fuses on the P.S. board. You can check them with a cheap ohmmeter (make sure the TV is unplugged first!). If they are bad, you have a bad Power Supply. Don't bother replacing the fuses without finding out what caused them to blow, or else they will just blow again. Take the set to a qualified technician.

Dec 17, 2009 | Fujitsu Plasmavision 42" TV

1 Answer

50sbx70b made sizzling noise then quit


Sizzle cound be crt arching or hv transformer. look for burn marks on transformer on deflection board. unplug set and remove crt boards from the crts and see if set will turn on. if replace arching crt. expensive. not to be attempted by amature.

Jun 27, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

5 flashing light code,unplug CR board,now 8 flashing light code


If you put the "CR" board back on, the error code will once again be 5 blinks. Your problem is likely the TV's IK blanking circuit. The Kine driver ICs on the CRT sockets boards CR, CB, and CG need replacement along with a few components in the 200 volt supply to the circuit.

Feb 12, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Sony KP-51WS510, standby led blinks 5 times


It sound like you have a bad picture tube...check your 1k circuit for correct voltage and wave form.

Oct 03, 2008 | Sony KP-51WS510 51" Rear Projection...

1 Answer

WT 46809


22 is a error code for a short protect which is triggering shutdown . Try unplugging the crt circuit boards and seeing if the fuses still blow when you press power.

Jun 22, 2008 | Mitsubishi WT-46809 46" Rear Projection...

1 Answer

SCreen turns red then shuts off


The 46H84 has 3 CRTs instead of a lamp. Red, Green and Blue. Your red CRT is shorting out shutting down the set.Here is how you test that theory. Remove the speaker grille, there will be an access panel behind the grille remove that and you will see the CRTs red is usually on the left. hit the power momentarally to locate which tube is red. then power down and unplug the power cord. Carefully remove the tubes Circuit board. ( you may have to carefully slice the glob of silicone applied at the factory to get the circuit board off) Once you have the circuit board off the Red CRT make sure it isnt touching anything and try powering up the set. If the set stays on and the other 2 CRTs light up. That tells you the RED crt is shorted and thats whats shutting your set down. Let me know if I can assist you further.

Mar 25, 2008 | Toshiba 46H84 46" Rear Projection...

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