CurtPalme.com Home Theater Forum

[haireez]

Guys,

Need some help. I've always wanted to improve my Vision 1 picture quality and follow closely on Marquee modification.

I changed resistors as per Nashou's thread : http://www.curtpalme.com/forum/viewtopic.php?p=106306#106306

However, I made a mistake by putting 270ohm resistor instead of 270k. Initially, the picture was OK for 2 days but it suddenly 'POP' and burnt both resistor. I've change the correct resistors on both of them but the picture is not stable right now.

Does anybody know what or which resistor is failing?

[macgyver655]

Are the location id's of those resistors R6 and R94?

[dvh99]

haireez, whatever you do, do 1 thing at a time, test for a couple hours and then proceed.

macgyver, could the lvps have been damaged by this?

[haireez]

It's the R5 & R46 resistors that 'POP'. Anyway, I have a spare HVPS and confirmed that the LVPS and other component is good except for HVPS.

[macgyver655]

1) What do you mean by the pic is not stable?

2) Was it stable before the POP?

3) Whats the number on the supply?

[CasetheCorvetteman]

Gday Macgyver!! Long time no see mate!!

[CIR Engineering]

See what Mac says because I am no expert on the Marquee HVPS. However, I don't recommend messing about too much with the HVPS. You can run outside the X-Ray emissions compliance of the projector...

It might be best to just scrap the one you popped and never use it again. There might be health consequences.

craigr

[haireez]

Hi Mac,

Below is the answer pertaining to your 3 questions.

1. The pictures is shaking from left to right (Tried to attached videos but unable to do so. I will send email to you soon)

2. Yes, this is a good HVPS until I made some error on the resistor.

3. Part number as per attachment

Hi Craig,

I've thrown the POP resistor and replaced with correct resistor but still unstable.

[Nashou66]

Check your PM it might help you.

Athanasios

[Curt Palme]

I wonder if you could have an H board issue? HV instability would usually result in an image increase or decrease in size all around, not just H shaking.

[Curt Palme]

I wonder if you could have an H board issue? HV instability would usually result in an image increase or decrease in size all around, not just H shaking.

[macgyver655]

Based on those MOV's you sent me you have some voltage fluctuation going on there. I would examine the disc shaped caps very closely. When they pop they usually just split the side a little bit and sometimes hard to find.

I dont have the print for the model so can't guide you directly. But use the traces on the board from those blown resistors and check components in both directions.

Curt, the pic is not really shaking back and forth as I thought from his description also. Its slightly changing size but in a consistent direction.


Case; I've been here.... where have you been?

[macgyver655]

Also, even the poly caps can split and be hard to find.

[Nashou66]

Macs right there is a 330pf cap (C4) right after those resistors. Check that as well and might as well check all other resistors in that circuit
R6 and R94. I would lift on end to test them .

Mac would the Inductor L3 get damaged possibly? I never came across a bad inductor ever.

Athanasios

[macgyver655]

Wait a minute here. Are we looking at the same print. My print says R5 and R46 should be 220 ohms and R6 and R94 should be 270k.

[Nashou66]

[macgyver655]

Maybe I misunderstood his posts then. The ones he incorrectly installed were R6 and R94. And the ones that blew were R5 and R46.

I'll wait for the answer.

[haireez]

Guys,

I'm sorry about the confusion. I just verified that the resistors that POP is R2 & R6. Instead of using 270k, i used 270 ohm and both of them POP. Physically, all other capacitors looks fine.

[macgyver655]

[Nashou66]

[haireez]

Guys,

Very interesting as my board shows R2 and not R94

Refer to photo attached.

However, does it matter? I have actually changed both to the correct value (270k) but why the image is still shaking.