I check voltages from SLA1004, HC801
and i found 12V = 11.27V
It is a little low and also feeds crt neck.
Can this be the problem?
JohnNovak
Senior Member
Last Activity: 12-03-2024, 03:16 AM
Joined: 11-23-2018
Location: Ljubljana
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Picture is a little better, white shadows still constantly present.
When TV is cold i have some lines in the picture which appears and disappears in about 3 seconds interval and rotate from horizontal to vertical position and back to horizontal.
Line disturbance take about 10 minutes to rotate for 180 degree, it is rotate very slowly.
After 5 to 10 minutes when TV is warming up this lines are almost invisible.Leave a comment:
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I also found one bad capacitor in vertical section, cap C307=100uF/50V was high ESR and capacity 88uF.
I replace all 3 caps, C418, C302 and C307....Leave a comment:
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Voltages seems to be correct....
Leave a comment:
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I replace C422 with new and does not help anything.
Old capacitor show good condition.Leave a comment:
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Yes the cassis is S63B.
I also suspect this cap but have no any in stock.
I need to order it and wait to come....Leave a comment:
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It is interesting that when the TV is cold, there is some disturbance in the picture, which then disappears slowly. The shadow is still present.Leave a comment:
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Hi R^J.
I replace C402 and C404 both 470uF.
I also check both old caps are ok.Leave a comment:
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Samsung CRT TV letters or text is shadowing
Hi.
I have some problem with old CRT TV Samsung model: CW-29Z338T, 29" size TV.
The problem is that letters and other text are not clear, text or letters are shadowed on the right side.
I found 2 capacitors on CRT Picture Tube Board.
47uF/400V was leaking very bad, the second cap 10uF/250V was bad ESR reading so i replace this cap also.
Replacement these 2 capacitors did not help nothing.
I try to reduce brightness, contrast and sharpness. There is very small effect on this shadow.
To reduce G2 down have more effect... -
Re: Samsung Syncmaster T220 problem
Hi.
Anybody can help with this problem?
Thank you.Leave a comment:
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Re: Samsung Syncmaster T220 problem
I also check this option, jammed buttons.
No any switch was jammed. One switch was a little tired when i compare to others.
I replace this switch. Multimeter readings show no any problem with switch.
The most important was pcb cleaning i think.
But still monitor housing need to be open, some service manuals should be used for opening this housing with
14 hidden clips.
Horrible Samsung monitor, easy to assemble almost impossible to disassemble without damaging the clips.
No any bad capacitor...Last edited by JohnNovak; 03-09-2020, 12:49 PM.Leave a comment:
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Re: Samsung Syncmaster T220 problem
Hi.
To open this monitor is nightmare.
I check capacitors are OK.
I can not found any problem about OSD display issue here.Leave a comment:
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Samsung Syncmaster T220 problem
Hi.
New problem with monitor Samsung Syncmaster T220.
Monitor works fine for months, it is used monitor.
Today is start to show brightness and is adjusted to 100 with not pressing any right side buttons.
Picture also goes black for 0.5 seconds every 5 seconds.
Probably need to check power board caps?
Any experience with this problem? -
Re: Gigabyte GA-7N400 rev.2.0 BIOS problem
I check already, can not see any fault cap as usual shows fault when goes dry.
I have 5.1V line voltage i think us OK.Leave a comment:
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Re: Gigabyte GA-7N400 rev.2.0 BIOS problem
Hi.
I check voltages with digital multimeter.
I replace power supply.
I change RAM, change processor, reflash bios 4 versions, reset bios...
Still +5V FAIL.
What else can i do?
Replace bios chip with new, can not because i order new chips but not received order.
Replace motherboard will be answer.Leave a comment:
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Re: Gigabyte GA-7N400 rev.2.0 BIOS problem
Hi.
I finally solve bios problem, desolder bios chip, solder plcc32 socket and sucesfully reflash the chip in other motherbard.
I put bios chip on board and motherboard works normal.
I reflash bios again on original motherboard.
Now i have new unknown problem in bios, +5V check fail?
Never see that kind of fault.
Any suggestion?...Leave a comment:
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Re: Philips 20PF4121/58 power inverter board problem
R_J.
I check resistor all OK.
I have no idea how to fix DC output to 14.5V.
I think TL431 have nothing with 12V output.
Can we check what is possible issue with buttons on TV?
TV have basic buttons on the top.
Power, vol -, vol +, MENU, P-, P+.
Some buttons not respond correctly.
This issue was present before and still make problem.Leave a comment:
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Re: Philips 20PF4121/58 power inverter board problem
Thanks.
I will check again resistors in that area.
There was electric shock here which destroy TL431, maybe i did not check good before.
I found some issue or maybe is not?
When i use scart input and i power OFF TV and power ON again there is no backlight back. I must disconnect power cable to get backlight operation.
When TV is on channel mode backlight works OK.Leave a comment:
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Re: Philips 20PF4121/58 power inverter board problem
Today i check again all outputs, looks OK....Leave a comment:
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Re: Philips 20PF4121/58 power inverter board problem
Thanks for reply.
I measure DC outputs when TV is turn off.
+10V = 12.35V
+3.3V = 3.57V
+12V = 3.57V
So the only voltage which goes down is +12V.
Switch FET=Q112...Leave a comment:
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