Lcd tv occasionally starts and shut down in a couple of minutes with 1 long and 2 short red led blinks repeatedly. mostly it does not start at all and goes to same error. replaced mc34067p and relative electrolytic caps both on main psu and on stadby psu. when it works ok +12v/+24v/+18v/-18v on main psu and +5.2v/+25v/+67v on standby psu. during fault standby psu +5.2v/+20v/+48v relay clicks once to supply nain psu but vcc to pin 15 ofic7001 only rises to +12v and hence does not start. any help?
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Hello, guys!
The same 32" Philips TV I was having video issues, but now I don't have standby led at all. Someone here shared with me the schematic of the power supply, and checking the voltages, I see right after the resistor R604 I'm getting 1.6 v which is too low for enabling the Gate of the Q601 mosfet (the diagram says 4.2). On the R614 resistor I'm getting 181 V in and 117 V out, then through R603 I'm getting the same 117 V in and 59.9 V out, finally getting the latter voltage in the R604 BUT getting just 1.6 V out, which is the voltage that goes on to the Gate of the Q601... -
Hi,
i'would like to fix my not working LG 49UB850V tv.
Symptoms:
-AC plugged in, Standby LED not working
-Switching on, Standby LED blinks 3x. LD2300 on mainbord lights up and after ~30s LD701 on PWS board starts to blink 5x repetetive
Checked already:
-Powersupply Output in Standby => 3.5V ok
-Switching On => PWR_On on P201 goes high and 3.5/12/24V are present on P201
Any suggestions what to check next?
Thanks in advance! -
Hello,
I have a problem with this TV, the standby voltage is not present. I have checked the components around the IC fsq510's area and they seem to work, also replaced this IC but the problem persists.
These are the voltages in some pins of IC fsq510:
Vcc=18v
D=320v
Vstr=154v
Unfortunately, I couldn't find the schematic
What else could I check?
Is it possible to provide standby voltage from an external source to allow the TV to turn on?
Thank you... -
My Samsung UE75TU7020k lights up fine when one of the ribbon cables are disconnected from the main board, lights stay on but not getting half a picture, I do the same with the other ribbon and put the other one in and lights stay on but not getting half a picture. The standby light flashes 2 times then reboots then it then tries to come back on again and just keeps looping until I take either one of the ribbon tables out (doesn’t matter which one I take out it stays lit when either one is out). I’ve tested the backlights but all working with none shorting out, I’ve replaced the main board... -
picked up a tv and when the power is plugged, the standby light flashes real quick then goes off. of 3.3, 12, 24v is all there but i couldnt find any 5v on the back-end board. ON/OFF is low, which it seems is what turns on the backlight so i removed the wire at the back-end board and put a 10k resistor to the 3.3v, which when plugged in brings on the backlight for a split second and also a blue light "LED1" on the inverter board, which goes off after a short time.
am i missing something to bring on the backlight or is the inverter/ccfl gone bad? would that cause the inverter board...12-01-2023, 09:55 PM