Mulja tv repair portal
Service manuals & datasheets => PLASMA TV forum => Topic started by: per on May 23, 2013,13:22:41
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Need diagram / service manual for LG 50 PK 760 ZC._ When I turn on TV, both relays click and the red light goes out. The screen lights up for a few seconds._ After this, all dead.
_ There are 5 volts st.by to the mainboard, which then turns on the power supply unit._ All voltages in the power supply is present. The 17v and 5 volts (P_5V) sent to the mainboard, but P_5v does not reach the multi power Ic and others, but disappears somewhere on the board._ (EAX61141603)._ If I pull a wire from L501 to IC503 input, tv works perfectly, but I would like to find the defective part on the main board. This main board to Z model has only one scart socket and is not similar to the other._ Hope someone can send me a diagram / service manual so I can make a real repair on my TV, although little fudge made it. Please direct to my mail: perbirgit1@gmail.com
Per Nielsen._ DK
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Check two 22R/5W resistence R-927 and R-929 on PSU board-one its O/C.Change all two
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5v, 17v and output for U sus and Z sus board are OK. The relays are only clicking one time = it does not shut off and try Again. All the voltages from PSU are OK. The problem is on mainboard. I just cant find a diagram for this model with only 1 scart.
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see link below for a picture of the PCB. The Voltages at the input of the IC was only 0.7 v. Now they are 5.03 volts and everything works, but the black wire is just a temporary repair. Somewhere there is a broken or burnt wire or a faulty IC. Need diagram to find it.
http://www.v8w.dk/LG/LG.JPG
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PD02A
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:08:
Thank You Jordan, now it is up to me the next dayes to study the diagram. My printer is busy now.
Regards Per, Denmark
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:c017:
Hi Jordan. The problem was Q501. Without a diagram, I would not until later have discovered that the 5 volts for USB was not present.
Thanks again for your help.