Question about JVC AV-48WP74 48" Rear Projection HDTV-Ready Television

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Convergence i have replaced the stk chips as well as 2 resistors, the 2 resistors are in front of the outward stk chip, and they keep opening. the stk chip behind them stays cool, while the other heats up. does anyone know where i can find a schematic for this set? i am a tv technician, i just cant seem to find the schematic. thanks.

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Re: convergence


Posted on Dec 17, 2007

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Convergence problem

Both convergence chips need to be replaced and or some resistors and set adjusted.

If have the original remote go into menu and select convergence to see if it will adjust---if not chips etc need to be replaced.

Set most likely uses 2 stk-392-120 chips but a few use the -110 chip.

May 29, 2012 | Philips Projection Televisions

1 Answer

Toshiba tp50g90 projection tv, red flashing light won't turn on

FYI: WHOEVER told you 110 chips can be replaced with 120 chips is wrong.

Easy way at this point to way at this point to see if chips are the problem is to UNSOLDER AND REMOVE BOTH CHIPS. Make sure not shorted connections and power set up---set will function without the chips but look terrible.

Try Suburban Electronics for the correct chips----only safe replacement for them is the 150 chip----stk-392-110 and stk-392-120 are not interchangeable.

The blinking light indicates a short.


Jan 16, 2012 | JVC Projection Televisions

1 Answer

Double image, red is 2 inches off main image. convergance ic amp?

Yes, your Convergence ICs have failed. Replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu.

Feb 20, 2011 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer

I have red convergance problem.. This is the second time I have replaced all diodes and the stk chips. they dont have any 110 stk chips so i am using 150 stk chips. I replaced all diods and now RK 62...

Alot of techs recommend using the higher wattage ICs to replace the stock ones, which is never a good idea since the resistors get stressed. Upgrading to the STK394-160 IC is the only upgrade Hitachi recommends but then the values of the resistors need to be changed since the stock resistors will not work with the upgraded ICs

Oct 09, 2010 | Hitachi 61HDX98B 61" Rear Projection...

2 Answers

The tv looks like it is in 3d. when i try to adjust the convergiance the plus signs on the left are bent

do not play with this tv replace the stk ic chips and the resistors around the stk chips ,cant miss em about 2 inches big with heat sinks on them.

Sep 11, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Hitachi convergence seems to be bad, but all resistors check in spec's can you check ic's the cross hach lines will move in all directions but some are bent

I know this set very well, have fixed hundreds of Hitachi sets with convergence problems--

first--did you just go into the customer menu?

There are two ways to get into the tech convergence mode on most of these sets---if the set has "MAGIC FOCUS" PRESS the button the front panel---while magic focus is running press magic focus again --if STOP is displayed on the screen press either RECALL OR STATUS BUTTON ON THE REMOTE--set will go to the tech convergence mode--take a good look there ---if red or blue is skewed most likely one or both of the 2 STK-392-110 CHIPS THIS SET USES IS BAD--NO WAY TO TEST THEM--IF RESISTORS ARE ALL GOOD--you have to replace BOTH chips to see if one is your problem.

You can also get into the tech convergence mode by removing the front speaker grill and inspection plate behind it----there is a tiny micro switch on the front of the board (little blue button) with something not metal--touch it with the set on and you will be in the convergence mode.

I presume you know how to navigate with the remote in this mode 2,4,6.8 to move--ant to select blue and 0 to select red---enter button will stop blinking cursor and you use the ARROW CURSORS to adjust---DO NOT TOUCH ANY OTHER BUTTONS---

What you are looking for is will the "bent" lines adjust.

If the answer is no--change the two chips and see what you have--The STK-392-110 chips can also be replaced with STK-392-150 chips---they are a longer life version of the original chip.

If you need help doing the repair ask me before you begin.


Oct 19, 2009 | Hitachi 53FDX20B 53" Rear Projection...

3 Answers

Red color distortion hitachi 46f500

Can't remember which this one uses but its right on the chips. Check your resistors too.

Apr 08, 2009 | Hitachi 46F510 46" Projection HDTV

1 Answer

SAMSUNG HC-P4752W 47" TV Convergence problem

Resistors most likey...look for burnt or discolored resistors near the convergence chips.

Apr 07, 2009 | Samsung HC-P4752W 47" Rear Projection...

2 Answers

Sony kp-57ws510 convergenece prblem

You didnt replace the STK's? You must replace the convergance IC's or you will continue to have this problem.

Sep 18, 2008 | Sony KP-57WS510 57" Rear Projection HDTV

1 Answer

Green rainbow streak on bottom of TV PT-47Wx49E

If Convergence on setup dosen't work, And you think its not STK Convergence chips!, Then "Yes" It more then likely will have a few open Resistors!... (Near STK chips)

Jun 24, 2008 | Panasonic PT-47WX49 47" Rear Projection...

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