symptoms were as such for this lcd tv ( Vestel Family) tv was working when turned on would stay on for 2 -3 hours shut off, cooled off then function again however after about 3 weeks it finally would not turn on as such it is totally dead no Led indicator lights whatsoever.
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Re: Seiki LC40B56 totally dead
Attached Files -
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Re: Seiki LC40B56 totally dead
here are some pictures of the innards of the Lcd Tv
1) model number
2)inside showing the various components
3) showing where the set was manufactured I believe in Korea (Samsung)
4) showing the power unitComment
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Re: Seiki LC40B56 totally dead
the power supply has 2 numbers ZD 95(G)F, CQCO4001011196 stamped on the item my question is what should I look at first and what is the consensus regarding these type of sets (Vestel?) brands and known problems
thanks in advance JohnComment
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Re: Seiki LC40B56 totally dead
Will need some voltage measurements from powerboard to mainboard connectorI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Seiki LC40B56 totally dead
ok I will do it by tomorrow thanksComment
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Re: Seiki LC40B56 totally dead
Vestel? It's not built in Turkey, so probably not a Vestel.
And Seiki is a very Chinese company, based in Beijing, IIRC...
Only Europe gets Vestel, IIRC...ASRock B550 PG Velocita
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"did I see a chair fly? I think I did! Time for popcorn!" -ratdude747Comment
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Re: Seiki LC40B56 totally dead
Not a Vestel UMC junker, also have you checked if the Tv is getting AC power normally the little rocker switches on these fail.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Seiki LC40B56 totally dead
Sorry I was away due to family matters, I did take some numbers for electricity for the picture of
5v SB = 5v dc
PS = 5v dc
for the transistors on the hot bar ie (see picture number A) see the numbers on the heat sink ie 1,2,3,4 voltage values were between 69v to 71v. the large capacitor laying on the side was giving readings between 270 to OL and back again. The transistors on the cold side ( several not in view ) are 0 vts dc. I am getting 120vts ac coming it ie the blue and brown leads in the top corner
viz here for the items ie 5vSB and the PS
Any input would be helpful I would consider taking off all the transistors and capacitors if necessary to gain proper readingsAttached FilesComment
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Re: Seiki LC40B56 totally dead
Hi. For a start you appear to have standby voltage so is the standby light on at front of set. The large capacitor on hot side voltage is measured from its pins neg to neg pos to pos and should be up around 370v. You need to ascertain if problem is in main or power board so see if you can force power board on when disconnected from main. But for a quick possible fix the two large caps cold side top of pic cheap to replace and try.Comment
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Re: Seiki LC40B56 totally dead
is ps 5v when powered on, or in standby?
we need to know what state the pin is, in both conditions.WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?Comment
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Re: Seiki LC40B56 totally dead
ok I did make a mistake there is no standby led light at all
USB pin reads 5 v dc
PS pin reads 5.64 v dc
the large cap on the hot side reading the voltage it is jumping from the high 200 vts ac ie last reading was 285 vt ac to OLComment
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Re: Seiki LC40B56 totally dead
Sorry I mean PS is reading 4.64 vts dcComment
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Re: Seiki LC40B56 totally dead
I did disconnect the main from the power board and tried to force a start up and still nothing happenedComment
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Re: Seiki LC40B56 totally dead
sorry again But here is what i did put the red lead from multimeter on ground used the black lead on the different pins as in picture on bottom i dont know if this is correct but here it
5v pin = -5vts dc
next 5vt pin =-5vts dc
usb pin = -5vts dc
ps =-5vts dc
last 5vt pin =5vts dc
still no standby light thoughComment
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Re: Seiki LC40B56 totally dead
Ok your readings are confusing. Here's what we need. Voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.
Black probe goes to ground for above tests. Main cap is measured in dcv across terminals of capI assume no responsibility for any stupid suggestions I might post.Comment
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Re: Seiki LC40B56 totally dead
I repair these on daily basis seems your flash eeprom has corrupted had this loads of times eeprom becomes faulty and drops boot loader this needs a reflash with correct software for screen as well has to be paired to eepromComment
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Re: Seiki LC40B56 totally dead
" flash eeprom has corrupted had this loads of times eeprom becomes faulty and drops boot loader this needs a reflash with correct software for screen as well has to be paired to eeprom" could you give me an idea how to repair the eepron in this case or should I buy a new one?Comment
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Machine won't power on, no power led, no fan spin, completely dead.
Checked PQ5400 - AONS32314 and pins 5,6,7,8 are 20v (AC adaptor voltage) but pins 1, 2, 3, 4 are 0v.
Following Gate Pin 4 to PU5400 - BQ24780SRUYR.
VCC 20v
ACDET 2.8v
ACDRV 0v (goes to pin 4 gate of AONS32314).
ACOK 0v
REGN 6v
According to datasheet, conditions are correct for ACOK to be high but it is not.
Tracing ACOK it's connected to ACIN which is connected to a pin GPB0 of IT8227 but also shown as connected to +3VL via a 100k resistor... -
hi to all! please help with 2 imac 21,5 dead...
i already changed u7700 in both without luck
u7700 pin 17, 18, 5, 4, 24, 12
have those voltages in both imac..
12v, 5v, 5v, 5v, 0,3v, 3,9v
i have 3V3_S5 (L7710) in one imac (one led) but no 5v on L7750
NO SHORT ON L7750
i have not 3V3_S5 (L7710) in the other (no led)
PLEASE HELP I'M GOING CRAZY!!01-25-2024, 01:46 PM -
've found in diode mode a super low value on pp3v42_g3h...removing l7095 and l7090, i've injected voltage on the line and found that u5000 become hot (3v 0,0100 amp)
replaced u5000 with a brand new one now i have
PPBUS_G3H=8.18
3V42_G3H=3.42
3V3_S5 3,3
no voltage for PP3V3_SUS (no shorts
on u8020 i have 0v on P3V3SUS_EN no shorts
0v on R1464 no shorts
SMC_ADAPTER_EN, 0v
PM_BATLOW_L, 3,3
PCH_DSWVRMEN, 0v
PM_DSW_PWRGD 0,9v... -
Hi!
I have this laptop and first let's go through what happened
Went totally dead, no reaction
I thought it was the adapter so I bought a new one = nothing happened
Opened up the laptop and adjusted the battery cable = Started working
Worked a couple of days and then went totally dead again
Now nothing works
I have opened the laptop, removed basically all removable components. It does not start without the battery or harddrive or anything disconnected.
Testing with voltmeter I can see 5.3V basically... -
Hi all,
As the title suggests, how can I be sure that my EC chip is really dead?
I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.
Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard...
Comment