I bought stk392-150 upgrade kit to fix the color after instaiing the two stk and 6 resistor still the same problem any i ideas on what could be wrong.. thanks eddie
I don't think the new Conv. board is faulty, also voltages to board had been tested and they are fine. Also Stk ICs read fine.
Clearly it is not a pwer board problem, or you get no power condition or PWB diag on hitachi.
If you have wrong colors check also that the CRts are all working, you will need to test the CRTs AC boards.
Ensure that there is no short to the chassis, that all the screws are in place.
Start testing the small AC power boards that power up the CRT
Test also the following parts:
Flyback transformer: BW02891
Signal power board JT23031
Focus pack AZ00161
Horizontal Linearity BZ04611
Still can you describe more about the issues so that I can help
Hello Eddie,
This may seems really basic but it has happened to me after a few frustrating hours of tweaking with no result.
Are the pins in the connectors for the CRT clean? If they are dirty or corroded it could cause poor picture quality.
If this set has digital convergence and I am sure it does and you attempted to straighten out this converegence before replacing the parts and you saved your changes then you have written bad data into the digital convergence module. Even though you may not have seen the lines physically move when you were trying to correct the converegence, the data still changes. This could be the reason you are still having an issue after replacing the defective parts. Otherwise, there should have only been minor adjustments that needed to be done after making the repairs.
Sir.
tnx for using fixya
resolder the terminals... they should fit well and good solder...
if it does not fix the problem.. remove all the upgrade components then return the original one... if it works well, then the replacement or upgrade components has trouble...check thier values and operating condition using a tester....
tnx...
if the resistors are not shorted or open, then it is the the stk that malfunction... the best way to solve the problem is by purchasing another one... i will not recommend any version of stk, it depends on you sir. but please check the compatibility of the add on sir, it is very important specially in upgrading...
tnx
i suggest that you look for burned, crack or blotted components on the board... youre right, there must be something that went wrong... the best thing to do is to check the components if ever doubtful signs appear on the board and its components.... pls do test thier condition... test capacitors, resistors, diodes, fuses and more....
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Hi,
Download Service Manual of Hitachi 51UWX20B for FREE from HERE, download all 16 files and use WinRar to unzip it.
You will have schematics, part list PCB lay out etc.
still need further help, let me know.
Just download service manual and have all parts details.RK42 = 3.3 ohms 1w
RK46 = 1.8 ohms 1w
RK50 = 2.7 ohms 1w
RK54 = 1.8 ohms 1w
RK58 = 4.7 ohms 1w
RK62 = 2.2 ohms 1w
Good luck.
I'm sure you are missing +28 and -28 volts supply on STKs. Please confirm above said volts coming from power supply. Service manual will help you to track down it.
Please confirm SW+7V at IK01 pin-1 and output +5V at pin3
and SW-7V at QK01 emitter and output -5V at collector.
If above said voltage are OK then Digital Convergence Board is defective and requires replacement.
" i get SW-7V at QK01 emitter and output -7V at collector not 5v "
Output should be -5 Volt at collector of QK01 as per service manual.
Please check biasing resistors and also QK01 as it can be leaky or damaged.
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Hi and welcome to FixYa,
If you got the STKs and the resistors as a package/kit, then they should serve the purpose. Additionally, you may want to check the pico fuses. A pico fuse would look like the image below (sometimes black in color).
Good luck and thank you for using FixYa.
If the fuses checks good, the STKs & the low ohmage resistors checks good or new and known to be good, then alternate possibility is low or no supply voltages. Have you checked the voltages using a DVM/VOM?
Verify that PIN:
8 is GND
11, 14, 15 & 18 are +Vcc
12, 13, 16 & 17 are -Vcc
Cheers.
Have you done an alignment after replacing the STKs? The Service Manual as provided by welcomejee would have details on how to align.
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U can get it at radioshack websites the exact fuse.
and for more details about how to check out the ic is it connected properly or not just click this link the brand is different but the problem is same
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
Try to check the video power supply board. There might be a defective component there.
Check wih the connections if all r perfect
then try removing all and pluging it again
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i did do that nothing same problem
do u know the exact ohm on the resistors rk-42,46,50, 54,58, and 62. where would i find e994 fuse i dont think its in the power supply
does any have the prints to tell me the vaule of all the resistors is there any specials fuse i should be looking for
i check all the fuse in the convergence board everyone test good
im just going to order new parts what should i get stk-392-110, 150, or 180 is there something else i should get. also order all the 6 resistors. i resolder everything on the board replace the new one with the old ones still the same thing. i cant see me getting two bad stk. dont know what else to do....
where should i check for volage supply?
i get +28 and -28 on both stk pins 4,5,8,10,12 and 17
pin 2 is ground
any more ideas guys????
i dont really see why i should do alignment i dont want to move the manates it work before there has to be something as burn
help
i get SW-7V at QK01 emitter and output -7V at collector not 5v
i get SW-7V at QK01 emitter and output -7V at collector not 5v
i get SW-7V at QK01 emitter and output -7V at collector not 5v
yes they r i clean them still the same thanks
yes they r i clean them still the same thanks
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