CurtPalme.com Home Theater Forum

[KrisRoberts]

Okay, thanks for the tip! For kicks I just went through the process in the service manual for "3-4-8. HWC (H Width Coil) Adjustment" to see how it looks with the current coils/tubes from my old projector with the E board in the new projector.

At 128 on R/B the Red is about 1cm on the screen smaller than green and blue is about 1cm smaller than red. They can easily be made to overlap by adjusting the size a few coarse clicks. It looks like the step to take to calibrate the E board to these coils is:

14. Adjust RED HWC (LV1), GREEN HWC (LV2) and
BLUE HWC (LV3) on the E board and perform
adjustment so that any other two colors can be matched
to the color with the smallest H SIZE values.

I could swap the magnets and see if they match better or still need adjustment. Part of me thinks it may be best to adjust the E board to match the coils as they are.

If I go the adjustment route I guess I am a little confused trying to interpret the instructions in step 14. It says "perform adjustment so that any other two colors can be matched to the color with the smallest H SIZE values". In my situation Green is the widest, then Red and then Blue. The previous steps had me set Green to be at the edge or the screen, and then set the H Size values for Red and Blue to 128.

Is the instruction to adjust Green and Red down to match the size of the Blue?
Or since the Green is currently set at the edge of the screen at the proper size for the image should I adjust the Red and Blue up to match the Blue?

My intuition would have me leave Green where it is since thats the size I want for the image and adjust the Red and Blue so their H Size 128 values match the Green width.

Or do you think it would clearly be better to pull the tubes and swap the coils?

[CIR Engineering]

Don't forget to zero out your ZONE corrections first!!!

What I usually do is set red and blue width to 128. I then center green. After that, expand green width so that the outside of the image (test pattern) is maybe one inch inside the frame of the screen. You will probably also need to adjust green linearity so that both sides are equal with respect to the screen frame. Make sure green also remains centered.

Center red and blue to green and then adjust red and green linearity so that they are even on the left and right sides of the screen with respect to green.

Finally adjust the width coils for the two colors which are the widest. In other words, shrink the two colors that are wider than the narrowest color. This kinda optimizes the projector to your unique screen and your screen / projector position.

A good tip also... All you need to do is take off the gray exterior case. Keep the chassis hatch shut for the adjustments. You will see that Sony (unlike) Marquee actually plans for technicians to work on their projectors There are three holes in the chassis that are there so that you can insert your allan wrench through the holes and adjust the width coils with the case closed. Also, you may use a regular metal allan wrench and you don't need any stupid special tools.

If you haven't already, make sure to first follow the procedure for the DY adjustments on all three tubes. I use a laser level on the screen for this.

craigr

[CIR Engineering]

So I got Alan's board today with the "Rectangle of flashing black lines." I swapped IC501 which is what Curt thought the problem was narrowed down to. Unfortunately, after swapping IC501 the problem persists

Alan sent me two YA boards. One has a bad IC421 (I am pretty sure) and the other has the "rectangle of flashing black lines." Tomorrow or the next day I may try and troubleshoot the "rectangle of flashing black lines" YA some more and see if I can find the actual problem. Or I might just take IC421 off the rectangles board and put it onto the YA with the bad IC421... I'll probably do some more trouble shooting because I would like to get to the bottom of this rectangles thing.

Anyone have any suggestions on what else may cause these fing rectangles? I am all ears to suggestions... time to look at the schematics some more.

craigr

[CIR Engineering]

The good news is that there are NOT two different IC's on the G90 YA that are irreplaceable and prone to failure. I repeat, IC501 does not seem to be the problem.

craigr

[Curt Palme]

Craig, scope the data lines. It seemed to me that the 'jaggies' causing the lines originated 'within' the IC 501. It may be that they are starting somewhere else, then are firing through IC501. I did scope IC 421 and they didn't seem to show up there..

[Curt Palme]

Craig, scope the data lines. It seemed to me that the 'jaggies' causing the lines originated 'within' the IC 501. It may be that they are starting somewhere else, then are firing through IC501. I did scope IC 421 and they didn't seem to show up there..

[ecrabb]

<non-tech stupid question>
Can you guys tell looking at the schematics from which IC the OSD originates? I'm thinking the actual character generator itself, not the part of the circuit that handles the compositing.
</non-tech stupid question>

SC

[cinema mad]

[CIR Engineering]

[CIR Engineering]

[RogueChili]

Most of the OSD signal information is input to the video chain via IC404 on the BA board. Pins 5,8,11 are std video inputs, pins 1,2,3 are the OSD video inputs, pin 4 is the video/OSD select signal, and pins 23,20,18 are the video outputs.

When pin 4 is high the OSD signal is selected and displayed, when pin 4 is low the std video is displayed.

The video/OSD select line control path is IC501 (origin), IC107, IC106 on the YA board and IC403, IC404 on the BA board.

Compare the select line (IC404 pin 4) signal with the good and bad YA boards installed to determine if it may be the source of the problem.

If you suspect the select line to be the source of the problem disable it by lifting pin 4 and connecting it to ground.

Let us know what you find. If the select line is false triggering I will look into a possible cause

[CIR Engineering]

FIXED

Fixed two YA boards in the last two days

craigr

[Nashou66]

[mp20748]

[HaydnG90]

[Frank D]

[CIR Engineering]

[CIR Engineering]

[CIR Engineering]

And the reason I am up at 4:30 AM is because I woke up thinking about YA boards... literally.

craigr

[RogueChili]

[CIR Engineering]